Thread: Turbo Charts And Best Turbos For Your Needs

seems like you have a good plan, but could possible be limited on power becuase of internals

I wouldn't necessarily say that. Sr20turbofreak (chuck) made in upwards of 500whp on stock internals with his Gti-r... he said its solid as a rock, so whatever that guy says goes...he is simply genius

guidlines to follow!

gt3076r/gt3037r are great for high 400 very low 500's

For mid to low 400's on a t3 get the 3071r. I bought the 3076r because I had solids and could rev to 9k no prob. But if you are looking for good drunt and not trying to spin the motor high to make power all the time, then the 3071 is great.

t3 flange 15-22psi 400-480hp goal 3071
t3 flange 22+ psi 450-520 goal 3076

That simple.

And always get the 4" inlet and gt30 hotside. Do not get the t31 hotside. Gt30 will make more power due to better efficiency.

If you are going to get the 2871r 56 trim, then IMO you might as well buy the 3071r without a hotside housing and then buy the HKS 2835r housing to make it t2 flanged with gt30 exit and use ext WG. Better wheel match IMO.

You are a little off.

the 3071R comes with T25 turbine housings

Below is the 3071R with .64 and .86 Turbine housings
http://www.atpturbo.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=GRT-TBO-025&Category_Code=GRT
http://www.atpturbo.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=GRT-TBO-026&Category_Code=GRT


Also the HKS turbine housing for the GT2835R is crap. They made the walls to thin on the turbine side.

^I have heard that this guy is pretty smart.

I know you can get the 3071r with a t25 flange from garrett and atp with the 90trim and 84trim wheel but onl in the 56.5mm major.

The 2835r housing is good for the 56.5mm major t-wheel and the GT3037 t-housing works for the 60mm major, which is the same wheel on the 3071r as the 3076r, standard gt30r t-wheel.

Wall's too thin for what, to hold in the turbine wheel if it lets go? Or so thin that the housing itself cracks?

But IMO the HKS housing is a much better option as it lets you go ext WG without the flow restricions of having the int gate welded shut and creating turbulence in the volute from not being smooth all the way through the housing. Plus you get the gt30 outlet which is great for extracting maximum power through turbine efficiency while offering nice housing A/R options.

The only thing I would buy from ATP is the twinscroll housing even though the casting is not that great who else you gonna get it from. Other then that they cost too much.

Garrett also offers the 3071r with 2 options of the t25 housing.

And yes, stock internals will handle a lot of power and abuse with a proper tune.

I wonder what my stock S15 SR20DET will net, all I have thus far is a FMIC, Greddy J-Pipe, HKS 3" Downpipe and Kakimoto 3" Exhaust, Greddy Intake, 2.5" Intercooler Piping, stock S15 turbo and upgraded 650CC injectors, Z32 MAF, Apexi Power FC L-Jetro, stock Exedy Organic Clutch Setup and 12-14psi. Any thoughts?

Go put it on the Dyno and find out. Having a bunch of people make a guess at your HP figures will mean nothing.

when you say it will bolt up to a t-25 flange. what does that mean exactly? it will bolt up to a t-25 Jpipe? so you can use teh t-25 manifold?