Turbo Comparison... includes NEW 2023 GARRETT GBC & BW SX-R turbos/post one
 

exducer inducer trim GT say what?

as i initially approached understanding turbos things became more, not less, confusing... some referenced turbos by inducer size, some by exducer. of course they reverse when you are talking turbine wheel V compressor.

i felt there needed to be a better way of comparing turbos.

as you may know all wheels have a minor diameter size and a major diameter. they are often in inches or millimeters. i wanted something simple to help me with sizing them.

i settled on the following:

take the minor diameter and solve for the area.
take the major diameter and solve for the area.
add together, divide by two.

you now have the average area of the wheel.

do it for the compressor (coldside/intake) , do it for the turbine (hotside/exhaust).

you now have two understandable numbers that help a great deal when you seek to compare turbos. needless to say there is a major correlation between area and airflow.

the cold side area determines the airflow potential, the hotside must deliver the power to actualise the potential.

hot area V cold area is especially valuable w the rotary. the rotary places a premium on large hot V cold wheel relationships. you want something approaching 1 to 1 areawise.

EDIT NOTE: significant flow advances for newer turbos which are bolded



here's my list in square inches:...............cold.......................h ot....................relationship

GT2860RS (Disco Potato).....................3.549................. ..3.105.................... 87%
FC T2 (OEM).........................................3.57 9....................4.288................... 119
BW EFR "6255".......discontinued..........3.79........... ...........6.758....................178
TDO5H 18G..........................................4.375 ......................3.363....................77
BW EFR "6758"....................................4.498... .................5.229....................86
G30-660............................................... .4.50.......................4.02.................. ..89 (2021 Garrett)
BW EFR "7064"....................................4.632... .................5.229.....................88
GT3071R........................................... ....4.776....................4.019................ ... 84
GT3071R........................................... ....4.776....................3.683................ .... 77
G30-770............................................... ..5.1.........................4.02................ ....79 (2021 Garrett)
GT2876............................................ .....5.224.....................3.108.............. ..... 59
RX6 TCW 17..........................................5.29.. .....................4.315....................82
BW K27............................................... ..5.36.......................5.06................. .....94
TO4E 57 Trim........................................5.369. ....................5.408 (Stg 5)......... 100
GT3776............................................ .....5.374.....................5.441.............. ...... 101
BW S200SX...........................................5 .40......................5.24..................... ....97
TO4E 60 Trim.........................................5.476 ....................5.408...................... 98
GT3076R........................................... .....5.511...................4.019................ ....... 73
BW S300SXE 7670..................................5.52........ ............5.27........................95
BW EFR "7670"......................................5.524. ..................5.229.......................95
GBC 35-700............................................5.5 7.....................5.13........................ 92 (2023 Garrett)
GTW5857........................................... ....5.59......................4.52................ .......81 (2015 Garrett)
GTX3076R.......................................... .....5.614..................4.019................. ......71.5
RX6 TCW10............................................. 5.63....................4.315..................... ..77
HKS TO4S.............................................. .5.64.....................5.89.................... ....104
Turbonetics 60-1....................................5.647........ ...........5.89....................... 104
Turbonetics T61......................................5.79..... ............... 5.89......................101
TO4B 62-1..............................................5.8 7..................... 5.89...................... 100
G30-900............................................... ...5.87.....................4.02.................. ......69 (2021 Garrett)
G35-900............................................... ....5.87....................5.16.................. .......88 (2021 Garrett)
FD (OEM)............................................. ....5.972.................5.25.................... ..... 88
RX6 TCW 76.............................................6.0 3....................4.315......................72
Precision 6062.........................................6.27. ...................5.408......................86
RX6 TCW77............................................. .6.356..................4.315..................... .68
Borg Warner S300 60 PN177282 & 80.....6.383..................6.328............... ........99
GT3582R........................................... ........6.386..................5.171.............. ........81
HTA 3582R (Forced Performance)............ 6.386.................5.171....................... 81
GT3574 (A-Spec, Turblown TD61)..............6.386..................5.89.(P) .................92
GT3082R........................................... .........6.386.................smaller than GT35R..?
Precision 6262...........................................6.4 48..................5.408.....................84
Precision 6265........................................... 6.448.................5.885 (P)...............91
GTX3582R.......................................... .........6.519..................5.171............. .......79
BW S362 FMW (billet)................................6.53...... ...............6.35......................97
BW S300 SXE 62-76..............................6.54.............. .......6.31.....................96 (2015) PN 13009097056 my 500 hp value pick for 2015
BW S300 SXE 62-80..............................6.54.............. .......7.15..................109 (2015) PN 13009097053 hot wheel mis-matched IMO
BW EFR "8374"..........................................6. 626..................6.23....................94
BW, R85, TEC300...................................... 6.667...................6.93...................... 104
GTW6262........................................... ........6.69......................5.38............ .......80 (2015 Garrett)
GTW6265........................................... .........6.69....................5.88............. .......88 (2015 Garrett)
BW Bullseye S362.......................................6.69... .................6.31.....................94
GTX3582r GEN II........................................6.73.... ..................5.15....................76..(201 8 Garrett)
BW SX-R................................................. ....6.78......................6.31................ .....93 (2023 BW)
HTA 3586 (Forced Performance).................6.839................ ...5.171....................76
GTW6465........................................... ........6.84......................5.88............ ........86 (2015 Garrett)
Precision GEN2 6266..................................6.91........ .............6.........................87 (2015)
Borg W S300s 61/87(2010 catalog)...........6.946..................6.928... ..................100
Precision 6765............................................6. 997.................. 5.885 (P).............. 84
Precision 6768............................................6. 997..................6.652 (GTQ)........... 95
TO4Z, A Spec GT500 PT67...........................7.002.............. ....5.885 (P)...............87
GTX3584RS......................................... .........7.02.....................5.13............ .......73 (2016 Garrett)
GBC 37-900............................................... ....7.03....................5.81.................. ..83 (Garrett 2023)
G40-900............................................... .........7.04.....................6.58............ .........93 (2021 Garrett)
BW S300 SXE 63..........................................7.06.. ..................7.15.....................101 (2015)
Borg Warner S300 63 PN177283................ 7.06....................6.31....................89
Precision GEN2 6466.....................................7.07..... ..............6.........................85 (2015)
G35-1050.............................................. .........7.08.....................5.13............ .......72 (2021 Garrett)
GTW6765........................................... ............7.09....................5.88.......... .......83 (2015 Garrett)
BW EFR 8474.............................................. ..7.10....................5.91..................83 (2019)
GT3788R........................................... ........... 7.155................. 5.694...................80
GT4088R........................................... ........... 7.167................. 6.423...................90
GTX4088R...........................................7.167.. ................6.423.................90
Borg Warner S364 FMW...............................7.17............ ........6.31....................88
BW S300 SXE 64...........................................7.17. ...................7.15...................99 (2015)
GT4088............................................ ............ 7.26.................... 6.633..................91
Precision 6766...........................................7.5 1......................6......................80 (2016)
BW SX-R................................................. .....7.52.....................7.15................ ...95 (2023 BW)
T78............................................... ............... 7.584................... 5.903................. 78
T88 33D............................................... ........ 7.58..................... 7.577................. 100
T66............................................... ............... 7.657.................. 5.894.................77
Borg Warner S300X 9179............................ 7.691................... 5.885 (P)........... 77
BW S300 SXE 66..........................................7.74.. .....................7.15...................92 (2015)
Borg W S300sx 66/91(2010 catalog)............7.743....................7.151 .................92
Garrett G42-1200...........................................7.7 5.....................7.52..................97 (2018)
G40-1150.............................................. ..........7.76......................6.58.......... ........85 (2021 Garrett)
BW EFR 9180.............................................. ....7.84....................7.189................. 92
Borg Warner S366......................................... 7.88.....................7.15................... 91
BW S300 SXE 69...........................................7.99. ......................7.15..................89 (2015)
Precision GEN2 6870.....................................8.01..... .................6.77..................85 (2015)
Xona/Tial 6894 "XR 95-68 X3C"......................8.17.................... 6.34...................78 (2019)
GT4094R........................................... ........... 8.175................... 6.423..................79
BW S300 SXE 72..........................................8.18.. ................... 7.15......................87 (2019)
BW EFR 9274.............................................. ..8.18......................7.15.................. .....87 (2019)
G 42 COMPACT 1200...................................8.27....... ...............7.51.......................91 (2021 Garrett)
BW EFR 9280.............................................. ..8.36.....................7.15................... ..85 (2019)
GT4294, T51R.............................................. 8.384................... 7.527..................90
Borg W K29 Billet (2010 catalog)..................8.432................... .7.175..................85
T88 34D............................................... ........ 8.449................... 7.577.................. 90
MasterPower "GT42"................................... 8.658................... 6.871................. 79
T70............................................... ................ 8.725.................. 6.648.................. 76
Borg Warner S368.........................................9.1.. ......................7.49....................77
Borg W S400sx (2010 catalog)......................9.174............... .....7.62....................83
Borg Warner S372-80.................................. 9.456................... 7.173................... 76
Borg Warner S372-83.4............................... 9.456................... 7.593................... 80
Borg Warner S372-84.................................. 9.456................... 10.298................. 109
Borg Warner S475....................................... 9.49...................... 10.292.................108
T72............................................... ................. 9.549.................. 6.648 (Q)............. 69
GT4202............................................ ............. 9.726................... 7.527.................... 77
T51R Spl............................................... ......... 9.92..................... 7.194.................... 73
Borg W K29 Billet (2010 catalog)..................8.432................... .7.175..................85
Masterpower GT45................................... 10.082..................... 8.4739.................... 84
T88 34D............................................... ........ 8.449................... 7.577.................. 90
MasterPower "GT42"................................... 8.658................... 6.871................. 79
T70............................................... ................ 8.725.................. 6.648.................. 76
Borg Warner S368.........................................9.1.. ......................7.49....................77
Borg W S400sx (2010 catalog)......................9.174............... .....7.62....................83
Borg Warner S372-80.................................. 9.456................... 7.173................... 76
Borg Warner S372-83.4............................... 9.456................... 7.593................... 80
Borg Warner S372-84.................................. 9.456................... 10.298................. 109
Borg Warner S475....................................... 9.49...................... 10.292.................108
T72............................................... ................. 9.549.................. 6.648 (Q)............. 69
GT4202............................................ ............. 9.726................... 7.527.................... 77
T51R Spl............................................... ......... 9.92..................... 7.194.................... 73
Masterpower GT45................................... 10.082..................... 8.4739.................... 84%


i also have max flow numbers in pounds per minute for each turbo that has a compressor map. take the pounds per minute, multiply by 14.471 to get CFM and divide by 1.92 to get approx max rear wheel rotary hp. or take pounds per minute, multiply by 10 and divide by 1.3 to get to the same general vicinity.

for instance... the GT3582R puts a hair better than 60 pounds per minute between 2.3 and 2.9 pressure ratios. (19-28 psi).

so, 60 X 14.471 = 868 CFM/ 1.92 = 452 max rotary rwhp. if you will notice the compressor map at 60 pounds you will note the RPM lines are very close to vertical which means the compressor is not able to accelerate further... it is very close to stall mode. overdriven.

a turbo acts at this point as a restrictor plate ala NASCAR. no more air. so IF the compressor map is accurate that's about it. you can do the same for any of the turbos.

this thread should be read as a companion to my "Making the case for the (rotary) powered FD.. The Fix.

Making The Case For The Powered FD: The Fix - RX7Club.com

the Fix is AI.

and AI changes how we can fixture our cars. we can run larger turbos because alcohol and water cools the CCP.

so take a look at the above list and pick your poison. i like 550 as a max target as above that number the engine becomes a bit in need of some reconstruction. also, if you have ever been in a 500 hp FD you will quickly realise it is about all you can hope to hook up without different transmissions and rear driveline components.

most of the numbers above should be accurate. feel free to offer any corrections. some turbos above can be fixtured w different hotside wheels. also the new deal is the billet compressor wheel which may offer additional flow per diameter due to less hub/more fins. most of this addition happens at very high pressure ratios (boost) and we are all waiting to see what happens when billet meets rotary.

trim relationships also add or detract from low rpm V higher RPM but area numbers should, i hope, be helpful.

additional turbo discussion welcomed... especially considering the ability to run alot more airflow w AI.

howard coleman

I just want to add what we talked about Howard, regarding compressor aero. This formula applies primarily to cast wheels with larger center hubs, since billet wheels of similar diameter actually have greater wheel surface area than a similarly sized cast wheel. Cheers

Interesting information, but theory and practical application have a pretty wide variation. Nevertheless, useful information. However, its a great ballpark figure, and as you mentioned.. if the compressor maps are accurate, these results should be on par.

A friend mentioned pre-turbo AI, do you have any suggestions on pre versus post turbo AI?

Thanks for the post, I am going to crunch some numbers myself :)

Interesting about the 4202, only77%

I have a GT4202 compressor combined with a GT47 turbine wheel here (92.7mm 82trim), thats far closer to the ideal 100 mark isnt it?

I don't think that 100% is always ideal, I think there are limits to how big you want your turbine to be period, in order to maintain gas velocity and reduce mass. Obviously depending on engine, porting, etc.

Hey howard, thought id update this thread for you and did the figures for a masterpower MP4503(GT45)

Masterpower GT45....................... ......... 10.082..................... 8.4739.................... 84%


what do you think of that for a turbo for a rotary, seems better than a gt4202 from garrett.

Ive been thinking about getting one instead of a borgwarner as i might struggle to spool a 98mm exhaust wheel up

are these figures max pump gas horsepower?//////////////////////yes pump gas w AI///////////////////

In all the turbo research I've done since I bought into my first turbo car 7 months ago, this is the best source on usefull info I've found in one place.
thanx Howard Coleman

FIGURES, printers out of ink......

the GTX3076r and GTX3582R numbers have been added as well will be a number of new BE EFR 2010 turbos.

the new GTX35 looks like a legitimate 570 SAE rw rotary hp package... in the smallish GT35 frame... weighing only 18 pounds.

another turbo that has caught my eye is the Forced Performance billet version of the 80 pound per minute GT4094 in a GT35 frame. they are talking 90 pounds per minute!

it looks like a VERY exciting year for turbo advances.

howard

Great Info- very Helpful, thanks

a "your welcome" to all the thank youz :)

do the final numbers on the right directly relate to HP or are these just a efficiency number?? where can you find the map numbers for the individual turbos...

its efficiency, but my understanding is its a bell shaped curve with the peak of the bell being right at 100, you start to lose in one area or the other as you increase or decrease from 100

like I said, that's just my understanding, I could be wrong.

I'm not so sure. The GTX3582R is only a 79, but it's one of the most efficient turbos ever made. That may jus be a billet thing though...

updated w BW EFR info

Do u have any info on XS Engineering To4s?

Is there formula to work out on say a gtx35 how the different size A/R hotsides will affect the end power figure ?

Howard the
"BW EFR "83".......................................... ..6. 626..................7.938......................11 9"

Is in the wrong spot, it should be below the Gtx3582r

:)

//////////////////thanks, all fixed, Howard/////////////////////////////////////////////////

"Is there formula to work out on say a gtx35 how the different size A/R hotsides will affect the end power figure ?"

i don't think there is a formula but relatively soon i will be doing a dyno comparison between a GT35 w a 1.00 and 1.15 A/R so i do hope to have some data...

BTW, i do recognise the answer is a bit late... :)

howard

Haha all good i bought a GTX35 anyway with the Tial 1.03 rear

I'm stuck between the s366 & t04z...I'm not extra knowledgeable of turbos so I don't really know the significance of flanges & a/r's...guess I'd take I'd take the one with quicker spool
I need help choosing one

another question would be
 

the turbine and the compressor both have a/r numbers. I understand that the larger number on the exhaust side means a looser housing and a later spool able to run at higher rpm without overspeeding.

I think that's what I understand.

Can somebody break it down for me?

have you fot the T04R ???

Good stuff!

Great info. Thanks!

Your post
 

Think you

Thank you for all the information

Is garrett T72 big for stock internal (plan of 14 psi)

"Is garrett T72 big for stock internal (plan of 14 psi)"

yes. not necessarily because of the stock internals but because of your boost objective.

the mismatch would be very large. i suggest you look for a turbo w a compressor in the 6 square inch neighborhood.

howard

I recomend the garrett gtx35 with an 0.8 t3 exhaust housing
I have an gt3586 hta with 1.06 t4 and for now im working with 7psi at 3500 rpms is full boost
The only drawback os that i need a tial v60 wastegate to control that turbo at that psi

definitely good call

best set up

Any word on the garrett gt-w line up. Any good?

"Any word on the garrett gt-w line up. Any good?"

Garrett debuted the GTW line (the "W" is for Wide as in wide compressor map according to Garrett.... wide is good) at the PRI last December.

still no compressor maps on Garrett's website but they state the 62 is good for 800 (piston) hp which means the wheel will do 80 lbs per minute which is good for 600 rotary rwhp SAE.

this jibes w the BW SXE 62. i have the currently non releasable comp map...

just a mild concern re the GTW line.

the 62.3, 64.3 and 67.3 comp wheels share the same exducer diameter (84.4) this gives the 62 a trim of 54, the 64 a trim of 58, and the 67 a trim of 64. i am wondering about Garrett's level of engineering commitment here especially when most also use just one size hotside wheel.

it seems that Garrett has generally been a bit small on the hotside which might work well on a piston engine but not as well on a rotary.

that said i do own and have run a GT4094r which is a bit small on the hotside but i am greatly impressed by both the midrange power (403 SAE at 5000 rpm at 25 psi) as well as top end. one of my engines on Sep 11 made 614 SAE hp at no more than 26 psi on the GT4094r.

here is a comparison from post one between the BW and GTW. note hotside relationship.

BW S300 SXE 62-76..............................6.54.............. .......6.31.....................96 (2015)
PN 13009097056 my 500 hp value pick for 2015

BW S300 SXE 62-80..............................6.54.............. .......7.15..................109 (2015) PN 13009097053 hot wheel mis-matched IMO (too large, probably laggy)

GTW6262........................................... ........6.69......................5.38............ .......80 (2015 Garrett)

GTW6265........................................... .........6.69....................5.88............. .......88 (2015 Garrett)

my GT4094r, which also does 80 pounds per minute has a 6.4 sq inch hotside...

ATM, i don't believe we have any data on the GTW line so it remains a just looking at the specs proposition.

it is amazing in 2015 that we have Borg Warner, Garrett and Precision turbos that are close to the size of the original GT35r yet are probably capable of making 600 rotary rwhp.

i own a BW S300 SXE 62 and will be dynoing it w a .91 and 1.0 sometime this year.

Howard

Awesome info as always HC.

So it seems the latest turbochargers all flow more air for the size,
What would be the ideal turbo for 400hp @ 15psi these days?

depends on a lot of things. I am making 400WHP at 1 bar and I am running a GT3574R. I would think a EFR 9180 could pull the same number and possibly an EFR 8374 and those will have wider powerbands. I have been debating which one I am swapping to.

Typically you want to run the smallest turbo possible for your power objective to gain in low end torque, but some of these larger turbo's (EFR series) can spool better than most other turbo's with inconel turbine wheels and run the same power at lower PSI, which I would choose since you can make the power more easily (better on turbo and engine with lower AIT).

I am addicted to response and boost thresholds that are low, but I also like how some of the turbo's power hit with a linear fashion and a smooth controlled.

I want a powerful yet soft power delivery. a smooth torque curve hence why I am so mixed up on between an EFR8374 and EFR 9180. not sure which curve I would like better. I am thinking the EFR 9180 might be a better selection for me as its closer to my GT3574R but has a little quicker boost threshold, and I can get a little more power at lower PSI.

inconel V titanium aluminide

i spent a half day w Dan Barlog who is Chief Engineer for Precision Turbo at their facility in Indiana last January. Dan designs the compressor and turbine wheels for Precision as well as just about every other part in the GEN 2 CEA line. it is worth noting that in the ultra competitive NHRA Pro Mod class Precision has notched numerous wins.

as we were discussing turbine wheels i mentioned BW's titanium aluminide 40% lighter wheel.

i can still remember Dan's exact comment....

"we tried that material and found we could not cast it in our desired configuration so we picked flow over weight."

you may of course dismiss this as just the comment of a competitor but set in the context of my half day w Dan, IMO, i take it as an honest comment from his experience. they are no rookies as far as working materials.

for instance, a major aspect of their very competitive GEN 2 CEA billet compressor wheels is that they are forged into a closed die that aligns the grain of the material allowing them to employ a thinner vane and smaller hub.

i don't think we have scratched the surface as to evaluating the 2015 turbos.

HC

What is the response like on the 3574? Does it pull all the way to the top?

So is there anything that stands out in particular on HC's beautifully comprehensive list between, say 7670, and gt35 (apart from cost prohibitive efr) that is efficient at low-boost 400whp?

Andy have you considered the EFR 9174?

Depends on what you want. My GT3574R is a damn good turbo and I like it a lot. I just don't like the open dump wastegate anymore, otherwise I would throw on a 3.5" down pipe to quicken up the down low torque/power and be good. If I had to choose from a non-EFR turbo I would choose a GT3574R or TD61R. its response is great, could use a little more oomph between 3-4K rpms, turbo makes GREAT power, I run a .84 T4 divided housing and it does not choke the top end at all. I think my car if 400WHP +/- 20WHP depending on altitude and weather at 14.5 PSI, at 17PSI it feels like 450-500WHP. by comparing to other cars this confirms my beliefs, I am guessing this based off pulls against other cars and fuel use of my total fuel capacity (injector duty cycle). I gained a ton of low/mid end and power going to a V-mount and putting the filter in the bumper opening. like 40-50WHP.

BW S300 SXE 62-76 that looks to have good wheel sizes but not a fan of journal bearings.


EFR wise, I am liking the look of the efr 9180 .92 A/R IWG. I will probably choose this for mine and run a 3.5" down pipe with long intake and large intake filter in the front bumper. I really want the IWG and the reliability of the wategate design. its simplier as well and I can get rid of the BOV on the intercooler piping, eliminate the boost controller and run it on my powerFC, more efficient and reliable cast manifold, etc, etc, etc. Losing the weight on the turbine wheel is a huge for torque down low. it spools great. I rode in an EFR8374 and it spools very very well, if a 9180 is anywhere near that I will be happy. I still think it will out spool my GT3574R, and from what I have heard from other tuners and users of EFR turbo's is the 9180 does in fact spool quicker and has a very nice linear power delivery while the 8374 can be a little too snappy/twitchy at times.

here are the torque delivery of some turbo's for comparison. I saw an EFR IWG 8374 ran at 18-15.5 which had almost the same torque curve as the efr 9180 IWG, but the 9180 was on an fc, long runner system, I think the 9180 on the short runner cast manifold with 3.5" DP FD engine will be really good.

Hmm, thanks for the insight.I was kinda thinking along the same lines with the gt35 and td61r. On the efr 8374, when you say snappy, can that not be controlled easily with throttle control? I would have thought that super responsiveness would be easier to control than a laggy turbo that isnt there when you need it but sneaks up on you when you dont?

Lookatme, could you post up specs for each of the torque plots in your graph?

fuel type, boost level, type of exhaust etc etc?

I am just quoting someone who has an EFR 8374 from this website. his is an external wastegate model. I have ridden in an efr 7670 EWG and I can understand what some of the people mean. It hits very hard all at once and will break the tires loose pretty easily. Also remember that I am used to a GT3574R and the power delivery of this turbo and I like it since I am used to it. I would want a turbo that is similar to it but still a little more quick spooling down low, I would say my turbo is alive and well above 3.5K rpms to 4K rpms....that is when it starts moving.

I had a short ram hot air intake a while back with a FMIC and upright radiator. when I had this design the turbo made less power and had less low end and mid range. I converted last winter to a V-mount and a long CAI with a HUGE air filter in the bumper. The set up lowered my AIT's by 10-20C and I felt a lot more low end and mid range punch. the power delivery became more linear and easier to drive with more power everywhere. It felt like it smoothed out the power delivery from low end to top end. The power delivery is strong and linear so it feels controlled and predictable. before it was more of an on/off switch where the ramp into power was more abrupt. the efr 7670 when floored is more of an abrupt hit, the efr 8374 is pretty smooth as well and probably could be controlled with your right foot. I think the IWG models make the power delivery easier to drive and smooth out the torque curves over the external wastegate models.

I am swapping set ups to basically simplify and quite the car, and by looking at the efr 9180 IWG dyno's and comparing it to the efr 8374 IWG at same PSI, I don't really see a huge gain in low end power, there is some, but its not HUGE, and the power is gained at 3K rpms only, I want the turbo to not be a huge spooler in the 2K rpms for better MPG, my 3574R doesn't boost much down low either. we have tons of mountains here and I perfer to have the turbo alive and well above 3K up and below its not a huge deal, since we have uphill or downhill roads I perfer to not be boosting the hell out of the engine down low for better MPG.

I also like the large hot side of the 9180 to get the heat out of the engine, we also stress turbo's more up here so running a larger turbo would be better to make power. the 3574R is a great turbo, I actually like it a lot, but plumbing the system back into the downpipe would be a pain and costly, more costly than buying an EFR 9180 IWG and doing it all with that. so I figured to go to the efr 9180 and sell my current set up. Plus I was in the GB for the cast manifold and its a great reliability upgrade (no welds, and better performance with matched port design).

I have taken the philosophy of making my car simplier and more reliable while focusing on performance. Performance for me is making the car perform at a higher level of performance while making the car more predictable.

What I have found with my car are these mods have been the most important for making a more reliable, faster, more predictable car.
wide wheels with slightly stretched tires (18x11.5" wide wheels with 285 tires).
soft springs with high CD damping settings (8/6 rates with high damping ratios (firm)).
linear wide power band with predictable soft inputs. (sometimes snappy inputs can disrupt balance of the car).

I think I like the power delivery of the efr 9180 IWG the most. look at the torque curves and how it never ramps steeply. I like those types of torque curves. Sometimes having the most responsive turbo isn't the most desireable, although an EFR 7670 has benefits of making the torque earlier and dropping off later. it's just things you need to get used to and learn how to drive. This is just my preference based off where I live and how I drive.

EFR 9180 is the FC that Turblown dyno's. long runner FC engine, he ran a FMIC with smaller diameter piping, 4" downpipe. 17-15.5 PSI

EFR 8374 was Jacob Cartmill's car at 12PSI, IWG, 3" downpipe, V-mount configuration.

GT3574R Unsure of set up, 3" DP I believe if I can remember. Mulitple PSI runs

EFR 7670 - Speedjunkie's car, 3" downpipe, external wastegate, V-mount, Syvecs ecu. Multiple PSI runs


To make generalities, what I have gathered from these dyno's is the largest factor for spool is the IWG, more direct complete pressure/heat on the short runner goes into the turbo and spools it faster, larger downpipe obviously a plus, typically longer CAI with large filters shift power lower and smooths out delivery, small V-mount is preferred.

I don't see much difference in terms of power and torque between the EFR 9180 and EFR 8374 at the same PSI and IWG models. I would think they are very close run on the same system with short runner manifold.

Attached are the dyno's I am comparing both run at similar boost levels. The unlabeled graph is a torque graph comparing the two.

Interesting about the EWG/IWG spool differences, I was trying to work out why the 7670 was being outspooled

I think it deals with the EWG and IWG......also you need to check on where the engine fits inside the compressor efficiency of the map, Also, spool and HP/torque are different, one can "outspool" the other in terms of PSI, but put out less WHP/Torque.

I just want to point out the 8374 is on pump gas and the 9180 is on E85 mix. Everyone keeps ignoring this.



I don't see much difference in terms of power and torque between the EFR 9180 and EFR 8374 at the same PSI and IWG models. I would think they are very close run on the same system with short runner manifold.


https://cimg8.ibsrv.net/gimg/www.rx7...b383220a99.jpg

Does that mean super advanced ignition timing to spool the turbo quicker? I am not familiar with the differences between tuning the two?

I would think the spool up would be similar given the same boost levels (between e85 and pump).

More advance usually slows spool because there's less burning going on in the turbine and lower EGTs.
The advantage E85 would have is more mass flowing past the turbine because of the additional fuel required.