So ive tore down my car and about to start biulding it back up. I plan to run it in some time attack series events and well as some track days. Im going to run in the modified class cant run the street class due to carbon doors which sucks. Anyways my current set-up is a gt35r I made 378@15 with stock ports with little room for improvement. Motor is coming out and having a large street port done, so Im thinking I might be able to run a gt40r. I was told in order to be competative I need to make as much power as possible and have as much tire as i can fit. Should I sell my gt35r kit and upgrade to the gt40r for the track? I figure Ill be above the RPM needed to spool it at all times anyways. What would you do?

Chris

 

Stay with the gt35r if you want to save some coin, and test out the car for the first season and then see what your playing with, but if you have some bank roll to experiment and go bigger then skip the gt40r and go with Garret

TO4Z with a 1.00 divided exhaust housing

http://www.atpturbo.com/Merchant2/me...egory_Code=GTB

contact our vendors first as I bet they will give you the best service and price .


And if thats a little out of the spending range then the TO4R will work real good to at almost $ 500-600 less.

 

+1 35r is best for a time attack car. although a 40r would work.

i say keep the 35r with the large street port and the right tuning, a wg dumped to atmo. you should be able to hit 430-440whp. my old 35r setup made 427whp at 15psi with a mild streetport and a atmo wastegate dump. i have since changed to a re-circ dump setup. its quieter but makes a bit less hp.

 

I would say if its strictly a time attack car, go with the 40r or t04z. Your gonna need some decent hp to compete with the other quicker cars. But this also depends on what class you are planning to run in.

 

not that this is related at all,

but all the fast time attack cars in jaja land are all runing the TO4Z ( the hk$ version ).

not that copying a setup willmake you fast, but why not try to get the most power/ response you can.

 

I think you'll want the faster spool and response of the 35R. As always, a lot depends on how much boost you're going to be running.....

 

A lot also depends on the track you run...

my car was one of the quicker private owned cars on the smaller local tracks, short straights, tight corners not a lot of real top speed at that time I was only running a to4e. But every time I tried to step out on a bigger track with longer straights, I got my *** handed to me, hence my swap to a larger turbo (62-1) and its really the best choice for the longer tracks, its OK on the longer starights but some of the other cars have setups that spool quicker, and on the shorter sections of the same track, they can pinch me on a regular basis.

so you really need to think about the tracks you plan on running also, its no different than changeing your transmission gearing, or you final ratio to match the track.

kenn

 

get a 500r

 

http://www.atpturbo.com/Merchant2/me...egory_Code=GTB

Is that the TO4z your talking about?

I only want to run around 16lbs of boost I might do a water injection kit and run 20lbs but im not sure.

I was just undecided becasue I know I can make power with the gt35r and it will spool up quick but im on stock ports, if I have a large street port and throw on a gt40r wont the spool be similiar due to the porting? If anything like a 200-400 RPM differance. Cause Ill tell you right now I usually had boost by 3600RPM when on the track are you down below that?

What turbo do you think is on the fujita rx7? Sounds like hes just messing with him this is one of my favorites
http://www.youtube.com/watch?v=ho6ftDtK3pw

Chris

 

imo id worry about developing the car and the driver first, before changing engines and turbos.

issues are many and varied, but cooling is a biggie, brakes tires etc etc

 

Yes thats the TO4Z I was talking about,

And in that video they say its a to4s putting down 460 hp, but in another video I have they say its a TO4R ( TO4Zs non ballbearing brother ) ( its harder for the to4s also called 60-1 , same size as your gt35 or very similar ) to make the 460 hp at 1 bar -14.7 psi bar

While alot of the track monster run the to4z at 16-17 psi on 93 octance equivalent.

 

Horsepower rating

To4Z= 750

4088R= 700

Advantage = To4z

Compressor wheel size

To4z= 66.7mm/84mm

4088 R= 63.5mm/88mm

Advantage = To4z

Turbine wheel size

To4z= 64.69mm/74.2mm

4088 R= 68mm/77mm

Advantage = 4088R

Compressor maps


******

Rear housing options

To4z= Divided .70 Divided .84 Divided 1.00 Divided 1.15 Divided 1.32 Divided 1.59 Undivided .61 Undeivided .70

4088R= .85 divided .95 divided 1.06 divided 1.19 divided

Advantage = To4z

Bs'ing with friends cool lookness factor on your beer table




Advantage = To4z

Price

To4z= $1575

4088 R= $1975

Advantage = To4z

responce, with the to4z beign slightly bigger , you wont notice a difference in spool from either one.

 

have you looked at precision turbos? The don't carry the "I'm all about myself appeal" but I can tell ya , they do perform well and beyond. I had a GT4067HP BTW.

Another point I would like to make is, if your on a budget, take a look into some of the non ball bearing turbo. I have alot of friends who can tell you that, driving style can help with keeping in boost and what not instead of relying on that extra 500 rpm that cost you an extra 1000.00, people then to go for things that can cover up their driving flaws. Just my .02

 

if you're serious about competing, this is the point i would try to impress upon you before making any changes in turbos. i completely agree with Kenn!
this would be the second point, i'd make. maximize yourself and the symbiosis between you and your car first. you're getting the motor ported and you may want to stick to changing one variable at a time.

which turbine setup are you runnning on your GT35R? what engine management?

 

Im running the t4 version with the .82 Hot side and apex powerFC. I raced sprint car midgets for about 3 years when i was growing up adn one thing that i learned was get your car where you want it then learn to drive it. I want to get all the important stuff done first learn to drive it then tweak it. the way the turbo comes on and how well the car keeps it put to the ground is really important no reason to run this gt35r for two races and learn its power band then upgrade the turbo two races later only to have to learn another power band. Im hoping to get my car down to around 2400 lbs and make as much power as i can from around 4k-8k at 15-16 lbs of boost. Maybe even have a scramble boost option for the straight aways with water/alcy injection for 22lbs. Anyways thanks for any opinions you can give me.

Chris

 

please send me a pm if you want to sale your gt35r, im looking to buy one

thanx

 

if they recommend you get as much power and tire as possible then, get as much tire and power possible.

seeing that you have some what experience on the track, then follow the words that you were told.

TO4Z

 

The 35R and the 4088R are almost the same turbo. We're talking a 2mm inducer difference.

So spool differential... minimal.

Hp advantage ... 30-40 maybe.

So if the little HP gain is what you are looking for then the 4088R is ok but IMHO a waste of money... If you want a big HP gain then go for the TO4Z.

Or if it were me, I would go with the GT-4094R before the TO4Z. Same inducer with an extra 10mm of exducer. 80 LBs/min VS. 75 LBs/min of flow.

4094R = 625-640 HP potential with similar spool as the TO4Z.
Will make more power at 1 bar than all others.

35R = 450-460 hp max with the least lag

GT technology FTW!

But in the end... it's your car. Do what you want.

 

I was just looking at some old Touge battle's and the Rea v's Feed fd battle came up, Does anyone know what Turbo the REA Touge car runs?? Because it wiped the floor with the Feed one? Does ReA still use small greddy Turbo's??

 

i believe their touge monster uses 99 spec twins. Has way better response in the tight turns of the touge than the single. Don't you watch initial d man!? HAHA!