Just a quick one i have posted this on a few other forums too.

Anyone ever thought of running 2x stock R34 GTR turbos on a 13B 4 port? Money for power here is not the question or relevent. Just the theroy.

Rough sizes (micrometer at work)
comp wheel 37mm .53 A/R
turbine wheel 42mm .48 A/R
Internal wastegates

No goals/aims just would these generate more power that stock turbine(s) on 13B 4 port & or 13B REW

Views welcome.

 

Turbine is waaaaayyyy too small.

 

re-amemiya makes a kit...the turbo's are td06's IIRC.

 

TurbineSSSSS

Thet both appear larger than the stock twins on an FD.

A few people do Kits but thats not what i'm getting at. I have 2 GTR R34 Turbines in front of me right now.

 

so have at it. let us know how it goes.

 

See the chart you get a better idea of the ones i'm on about :

look at BNR34

http://homepage.ntlworld.com/tbroom/Turbos.htm

There is also a standard turbo pictures llink at the bottom

 

https://www.rx7club.com/showthread.p...83#post8994183

 

The turbines are wayy too small for the rotary. Period.

Unless you can send them out to change the turbines, you'd be looking at some serious heat and virtually no top end, even if they are larger than the HT12's in the -REW the exhaust side is what is the limiting factor.

 

Really, I don't think it would be worth it. Sell those GT-R turbos for ultra-JDM dollars and get yourself a nice GT35R. But if you want to try it, go right ahead.

 

Howard Coleman (FD owner) runs two T3/T04E hybrids , stage 5 turbine wheel on each with a 46 trim compressor wheel. I'm not 100% on all these measurements, but it's something like:

turbine wheel:

~71mm major
62mm exducer
I think his hotside A/R is .82 ...

compressor:

51mm inducer, 75mm exducer with I believe a .50 A/R housing

He uses the ATP Turbo ultimate internal wastegate assembly. That's on EACH turbo, and I think he makes around 500rwhp on alcohol injection. He also indicated that turbine wheels and turbine housings any smaller than that had too much backpressure (he has a custom digital backpressure gauge in the exhaust).

If you do want to do custom twins, I wouldn't do turbine wheels and housings any smaller than that.

 

FWIW I was seeing very similar EMAP values in my stock REW twins as Howard is seeing in his setup, ~18PSI. Although, he is also generating alot more HP than I am which obviously means more air/fuel in and more exhaust volume out. So take that with a grain of salt.

The one drawback I see to a project like this is, how much useable power are you going to make and where in the RPM's is the power going to be? The sequential HT-12's provide incredible response and a pretty linear torque curve to redline. Running two larger turbo's in parallel would most definately eliminate low RPM response but when they get positive pressure, would destroy the twin HT-12's torque numbers.

So, what do you want out of the car? Do you want a zippy responsive car on the street that makes positive manifold pressure <2krpm? but max's out in the 350-380 range? Or 500RWHP that proabably isn't really useable on the street.

EDIT - BNR Stage 3's are good for ~420RWHP sequentially. They are basically twin GT28's iirc.