Single Turbo RX-7's Questions about all aspects of single turbo setups.

Which bw turbo for 400-450 on standard ports?

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Old 10-20-14, 12:45 PM
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Originally Posted by drftinmx6
, a guy with the better peak power and peak torque will still scream right by him.
........in a long roll race. I own a precision so it's not like I'm biased. Besides drag racing or roll racing from 60-160 the EFR will embarrass another turbo making similar peak power on a rotary.
Old 10-20-14, 01:14 PM
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Originally Posted by djseven
........in a long roll race. I own a precision so it's not like I'm biased. Besides drag racing or roll racing from 60-160 the EFR will embarrass another turbo making similar peak power on a rotary.
Oh i can agree with that, if the power is around the same the EFR car will win because it gets there quicker.
Old 10-21-14, 09:50 PM
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Originally Posted by drftinmx6
i guess it just depends on what kind of power you want, i'm more of a decent spool and good peak power kind of guy, if you don't want peak power and want fast spool and good mid range i guess the EFR is the best turbo for you. These engines were made for peak power, and you can even make good low end torque and peak power with the Right combination. Islander Made 550hp/500tq at like 5500rpm or something like that on a GTX42R. i'd say that's pretty good torque. while an EFR will make more power sooner, a guy with the better peak power and peak torque will still scream right by him.

I know you are trying to be the devils advocate with the EFR turbo series.

I have been in and tuned some of the turbos you are mentioning. The EFR series turbo's are completely different than the other turbo's out there.

IMO, what makes a turbo great is the ability to make torque/power across the largest part of the rpm usable range while having a nice smooth power delivery that is easy for the driver to use.

The larger turbo's take time to spool up, and when they do the ramp rate is very steep and violent giving the car an OH SHYT factor, but not good for driving in backroads or even a track.

the EFR hits very early, and yes it hits hard, but you can pedal it very easily, the larger turbo's canot spool for crap down low and you cannot soft pedal it like an EFR turbo doing part boost at 3-5K.

I think the small-middle sized turbo's on the 13B is where things are drivable/fun/etc. The EFR8374 is a middle sized turbo that acts like a small sized turbo and puts down middle sized to larger size power.

EFR8374 dyno's


BW S360


Another good dyno GT35R


EFR8374 FTW
Old 10-22-14, 05:54 AM
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Impressive, those torque curves almost look naturally aspirated
Old 10-22-14, 08:37 AM
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Originally Posted by lOOkatme
I know you are trying to be the devils advocate with the EFR turbo series.

I have been in and tuned some of the turbos you are mentioning. The EFR series turbo's are completely different than the other turbo's out there.

IMO, what makes a turbo great is the ability to make torque/power across the largest part of the rpm usable range while having a nice smooth power delivery that is easy for the driver to use.

The larger turbo's take time to spool up, and when they do the ramp rate is very steep and violent giving the car an OH SHYT factor, but not good for driving in backroads or even a track.

the EFR hits very early, and yes it hits hard, but you can pedal it very easily, the larger turbo's canot spool for crap down low and you cannot soft pedal it like an EFR turbo doing part boost at 3-5K.

I think the small-middle sized turbo's on the 13B is where things are drivable/fun/etc. The EFR8374 is a middle sized turbo that acts like a small sized turbo and puts down middle sized to larger size power.

EFR8374 dyno's


BW S360


Another good dyno GT35R


EFR8374 FTW
while those turbos do come in early, and make a "broad" powerband, the peak numbers are no that impressive in my opinion. and also you have to think about how much goes into turbo spool, such as manifold design and exhaust flow and porting. all those factors make a difference in how turbos spool, and howard coleman even said himself on his 4094R that he got it to hit full boost as soon as 3000-3500RPM, the EFR's technology is a advanced so maybe everything around it doesnt have to be perfect, but spool can be improved on other turbos as well.
Old 10-22-14, 09:43 AM
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Originally Posted by drftinmx6
while those turbos do come in early, and make a "broad" powerband, the peak numbers are no that impressive in my opinion. and also you have to think about how much goes into turbo spool, such as manifold design and exhaust flow and porting. all those factors make a difference in how turbos spool, and howard coleman even said himself on his 4094R that he got it to hit full boost as soon as 3000-3500RPM, the EFR's technology is a advanced so maybe everything around it doesnt have to be perfect, but spool can be improved on other turbos as well.
You can definitely improve spool times, but the efr's are rediculous. I am very anxious to see a larger efr 9180 dyno. I bet it will be insane.

Just curious what turbo do you have in your car and roughly how much power is it making?
Old 10-22-14, 03:50 PM
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Originally Posted by lOOkatme
You can definitely improve spool times, but the efr's are rediculous. I am very anxious to see a larger efr 9180 dyno. I bet it will be insane.

Just curious what turbo do you have in your car and roughly how much power is it making?
at the moment i have an S366 with an 11 blade billet wheel, the car will be going on the dyno within the next 2-3 weeks so i will post updated pics of graph when it's done.
Old 10-22-14, 05:01 PM
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Peak numbers in that EFR dyno of mine are low because it has ignition misfire.

I expect the 8374 to make 550rwhp+ at those boost pressures on the top end.

I will have 9180 EWG results at 35psi on E85 in 2 weeks time.
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Old 10-22-14, 06:40 PM
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Precision isn't a real turbo company and you won't see anything beyond hobbyists using their turbos.

Precision doesn't have the documentation or the knowledge a race team or OEM engineer needs to utilize their turbos. Whats the surge line? What RPM can the turbo be run at and at what efficiency?

Is an engineer going to buy a bunch of Precision turbos and run them on their engine to find what works best or will they take their engine data and compare it to a real turbo companies documentation and pick the proper turbo?

The advantage Precision does have is their multitude of offerings in any imaginable combination that can be experimented with (not calculated) for use on any engine/application.

I agree that some very good engine/Precision/application turbo matches have been found.

EFR will get to that point in the future- just as the GT line did from their initial set GTxxR offering to the current GTxxxxR offerings.

Because the EFRs are a true motorsports turbo first they are meeting the goals of the racing teams they cater to.
You can see this with the IRL twins which have a specific exhaust wheel and turbine housing design.

Why the EFR line does so well with the rotaries (and this is not just hype) is the large exhaust wheel size compared to compressor wheel size coupled with the exhaust wheel's light weight.

This provides leverage to drive the compressor with the huge rotary exhaust energy at no downside- great spool and good top end exhaust flow potential.

On something like the Subaru with so much exhaust energy lost through the long header tubes the EFR gains have been shown to be minimal to none. Subaru does better with a tiny exhaust wheel to compressor wheel ratio.

Once there is an ample supply of EFR pieces I predict we are going to see that an EFR 8380 made from the 8374's compressor and 9180's exhaust turbine is the absolute best 500hp turbo imagined to date for a rotary with even better spool than the already great 8374 and slightly improved top end power when used at high boost.

After that we will just have to wait for the electric hybrid turbos to become mainstream for a marked improvement.
Old 10-22-14, 07:04 PM
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Efr too much $$$rather have a pt6766 ballbearig
Old 10-22-14, 07:06 PM
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Originally Posted by Turblown
Peak numbers in that EFR dyno of mine are low because it has ignition misfire.

I expect the 8374 to make 550rwhp+ at those boost pressures on the top end.

I will have 9180 EWG results at 35psi on E85 in 2 weeks time.
Nice numbers but on E85.. that's great and all but what numbers would we see on normal pump gas ie 91, 93, 94 ect? No easily accessible E85 up in canada.
Old 10-22-14, 07:55 PM
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Originally Posted by tys93r1fd
Nice numbers but on E85.. that's great and all but what numbers would we see on normal pump gas ie 91, 93, 94 ect? No easily accessible E85 up in canada.
One of our dealers put down 400rwhp at 10 psi on a raceport. This was Unique Precision Rotary.
Old 10-22-14, 08:44 PM
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"Nice numbers but on E85.. that's great and all but what numbers would we see on normal pump gas ie 91, 93, 94 ect?"

power is all about burning oxygen molecules. E85 and gasoline should make the same (approx) power if the fuel delivery is adjusted for the differing BTU content and timing for burnspeed.

the one area where E85 has an advantage is it will withstand higher CCP and CCH that comes from higher boost. you can mostly make up for this w the proper amount of AI.

when you get to crazy levels.... like 1000 hp, alcohols show their superiority but in the real world that most of us inhabit you can do it w gas or E85.

howard
Old 10-23-14, 05:47 AM
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Originally Posted by BLUE TII
Precision isn't a real turbo company and you won't see anything beyond hobbyists using their turbos.

Precision doesn't have the documentation or the knowledge a race team or OEM engineer needs to utilize their turbos. Whats the surge line? What RPM can the turbo be run at and at what efficiency?

Is an engineer going to buy a bunch of Precision turbos and run them on their engine to find what works best or will they take their engine data and compare it to a real turbo companies documentation and pick the proper turbo?

The advantage Precision does have is their multitude of offerings in any imaginable combination that can be experimented with (not calculated) for use on any engine/application.

I agree that some very good engine/Precision/application turbo matches have been found.

EFR will get to that point in the future- just as the GT line did from their initial set GTxxR offering to the current GTxxxxR offerings.

Because the EFRs are a true motorsports turbo first they are meeting the goals of the racing teams they cater to.
You can see this with the IRL twins which have a specific exhaust wheel and turbine housing design.

Why the EFR line does so well with the rotaries (and this is not just hype) is the large exhaust wheel size compared to compressor wheel size coupled with the exhaust wheel's light weight.

This provides leverage to drive the compressor with the huge rotary exhaust energy at no downside- great spool and good top end exhaust flow potential.

On something like the Subaru with so much exhaust energy lost through the long header tubes the EFR gains have been shown to be minimal to none. Subaru does better with a tiny exhaust wheel to compressor wheel ratio.

Once there is an ample supply of EFR pieces I predict we are going to see that an EFR 8380 made from the 8374's compressor and 9180's exhaust turbine is the absolute best 500hp turbo imagined to date for a rotary with even better spool than the already great 8374 and slightly improved top end power when used at high boost.

After that we will just have to wait for the electric hybrid turbos to become mainstream for a marked improvement.
You do know that the hennessey venom GT runs precision turbos right? Fastest production car in the world.. Just saying
Old 10-23-14, 07:41 AM
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Originally Posted by Turblown
One of our dealers put down 400rwhp at 10 psi on a raceport. This was Unique Precision Rotary.
Sweet thanks
Old 10-23-14, 08:10 AM
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Originally Posted by Howard Coleman CPR
"Nice numbers but on E85.. that's great and all but what numbers would we see on normal pump gas ie 91, 93, 94 ect?"

power is all about burning oxygen molecules. E85 and gasoline should make the same (approx) power if the fuel delivery is adjusted for the differing BTU content and timing for burnspeed.

the one area where E85 has an advantage is it will withstand higher CCP and CCH that comes from higher boost. you can mostly make up for this w the proper amount of AI.

when you get to crazy levels.... like 1000 hp, alcohols show their superiority but in the real world that most of us inhabit you can do it w gas or E85.

howard
thank you this helps a bit, I'm still learning so please excuse the lack of knowledge
A little off topic of the thread but regarding this question.
I always thought that E85 made a fair sized difference, especially when running either E85 or gas only and not running AI or WMI with gas.
That's where i was looking for a comparison as if this kit was on a car running pump gas only how would it compare to E85 only

If I'm understanding correctly what you're saying is that under normal or more moderate situation running either fuels with the fuel rate adjusted according to the BTU content of each respective fuel output would or could be the same however fuel consumption rate will differ accordingly
And that under higher output situation E85 will have the advantage I'm assuming part due to lower combustion temps and stability under higher pressure?
Old 10-23-14, 10:36 AM
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Originally Posted by BLUE TII
Precision isn't a real turbo company and you won't see anything beyond hobbyists using their turbos.

Precision doesn't have the documentation or the knowledge a race team or OEM engineer needs to utilize their turbos. Whats the surge line? What RPM can the turbo be run at and at what efficiency?

Is an engineer going to buy a bunch of Precision turbos and run them on their engine to find what works best or will they take their engine data and compare it to a real turbo companies documentation and pick the proper turbo?

The advantage Precision does have is their multitude of offerings in any imaginable combination that can be experimented with (not calculated) for use on any engine/application.

I agree that some very good engine/Precision/application turbo matches have been found.

EFR will get to that point in the future- just as the GT line did from their initial set GTxxR offering to the current GTxxxxR offerings.

Because the EFRs are a true motorsports turbo first they are meeting the goals of the racing teams they cater to.
You can see this with the IRL twins which have a specific exhaust wheel and turbine housing design.

Why the EFR line does so well with the rotaries (and this is not just hype) is the large exhaust wheel size compared to compressor wheel size coupled with the exhaust wheel's light weight.

This provides leverage to drive the compressor with the huge rotary exhaust energy at no downside- great spool and good top end exhaust flow potential.

On something like the Subaru with so much exhaust energy lost through the long header tubes the EFR gains have been shown to be minimal to none. Subaru does better with a tiny exhaust wheel to compressor wheel ratio.

Once there is an ample supply of EFR pieces I predict we are going to see that an EFR 8380 made from the 8374's compressor and 9180's exhaust turbine is the absolute best 500hp turbo imagined to date for a rotary with even better spool than the already great 8374 and slightly improved top end power when used at high boost.

After that we will just have to wait for the electric hybrid turbos to become mainstream for a marked improvement.

now an 8380 would be impressive i think.
Old 10-23-14, 11:48 AM
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Originally Posted by bmwrx7man
Efr too much $$$rather have a pt6766 ballbearig
Precision 6766 ballbearing turbo T4 divided 1.0A/R $2,180
Tial 44mm wastegate $350
HKS SSQV BOV $250

Extra welding costs $100
Misc hardware $100 (V-band clamps, extra vacuum hose)

total cost $2980 for this turbo

IWG EFR 8374 .92 A/R, with V band clamp + flange

total cost $2744

The EFR turbo is actually cheaper.
Old 10-23-14, 11:52 AM
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$2200 so even cheaper !

http://www.turbosource.com/mobile/Pr...e=TS1-03-83740
Old 10-23-14, 12:26 PM
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You do know that the hennessey venom GT runs precision turbos right? Fastest production car in the world.. Just saying

That is a (very expensive) shed built kit car. Engines built in a shed in Texas and shipped to a shed in England where the rest of the fast kit cars hail from.

From Wiki-
The Venom GT uses a highly modified Lotus Exige chassis. The manufacturer, Hennessey Performance Engineering, claims the modified chassis utilizes components from the Lotus Exige, including but not limited to the roof, doors, side glass, windscreen, dashboard, cockpit, floorpan, HVAC system, wiper and head lamps. Hennessey Performance and the Venom GT are not associated with Lotus Cars. For road use, the car is registered as a Lotus Exige (modified) and is not in fact a series production car.[1]

As of August 6, 2014, 16 of the proposed 29 Venom GTs have been sold.[10][11]

I'm not saying Precision Turbos don't do the job- I'm saying they don't get hired for real jobs because they have no resume.

Next you are going to tell me how PTE is also heavily associated with NHDRA... Yes, because they paid to be.

PTE knows marketing very well just like Hennessey (the king of hype) and they hire out what engineering they deign is necessary to make money and no more.

PTE won't bother with compressor and exhaust side maps because their market (aftermarket) does not require or know how to utilize them anyways- that money is better served in marketing.

PTE is not a real turbo company just like Hennessey is not a real car company.

I do agree that if PTE makes a turbo that matches the rotary engine very well and has an advantage over other turbos I am going to buy it.
Old 10-23-14, 12:58 PM
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Originally Posted by lOOkatme
Precision 6766 ballbearing turbo T4 divided 1.0A/R $2,180
Tial 44mm wastegate $350
HKS SSQV BOV $250

Extra welding costs $100
Misc hardware $100 (V-band clamps, extra vacuum hose)

total cost $2980 for this turbo

IWG EFR 8374 .92 A/R, with V band clamp + flange

total cost $2744

The EFR turbo is actually cheaper.
you have to compare apples to apples, compare the prices of a 6766 to the price of a 9180, and a 6266 to an 8374
Old 10-23-14, 01:00 PM
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Originally Posted by BLUE TII
You do know that the hennessey venom GT runs precision turbos right? Fastest production car in the world.. Just saying

That is a (very expensive) shed built kit car. Engines built in a shed in Texas and shipped to a shed in England where the rest of the fast kit cars hail from.

From Wiki-
The Venom GT uses a highly modified Lotus Exige chassis. The manufacturer, Hennessey Performance Engineering, claims the modified chassis utilizes components from the Lotus Exige, including but not limited to the roof, doors, side glass, windscreen, dashboard, cockpit, floorpan, HVAC system, wiper and head lamps. Hennessey Performance and the Venom GT are not associated with Lotus Cars. For road use, the car is registered as a Lotus Exige (modified) and is not in fact a series production car.[1]

As of August 6, 2014, 16 of the proposed 29 Venom GTs have been sold.[10][11]

I'm not saying Precision Turbos don't do the job- I'm saying they don't get hired for real jobs because they have no resume.

Next you are going to tell me how PTE is also heavily associated with NHDRA... Yes, because they paid to be.

PTE knows marketing very well just like Hennessey (the king of hype) and they hire out what engineering they deign is necessary to make money and no more.

PTE won't bother with compressor and exhaust side maps because their market (aftermarket) does not require or know how to utilize them anyways- that money is better served in marketing.

PTE is not a real turbo company just like Hennessey is not a real car company.

I do agree that if PTE makes a turbo that matches the rotary engine very well and has an advantage over other turbos I am going to buy it.
PTE does make turbos that matches rotaries very well, what about the 6766 and the 6466
Old 10-23-14, 02:46 PM
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Originally Posted by drftinmx6
you have to compare apples to apples, compare the prices of a 6766 to the price of a 9180, and a 6266 to an 8374
EFR 9180 $2593 with everything using the same website.

Turblown probably offers it cheaper.
Old 10-23-14, 06:34 PM
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EFR 9180 is $2,200 and price will probably drop as supply rises since Honda is no longer allowed to use this turbo in Indy racing.
Old 11-08-14, 02:05 PM
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Originally Posted by junito1
Borg Warner doesnt make s362, I don't think. Options are s360 177272( I have this one). S363 and s366--These are ones on catalog from factory Borg Warner from turbodriven website. All other s362 and s372 plus other random sizes I'm assuming are modded by others companies.

For airwerkz I would suggest s363 or s366 for that 420whp goal on stock ports.
http://www.full-race.com/store/turbos/borgwarner-airwerks/borgwarner-s300sx-88-75-turbo.html

It has a 63mm compressor so thats what some people get confused about.


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