RollCage

Officially in and paid for option 2 with the Gen 2 GTX3076R. Really excited to see how it'll perform.

soulicious

I just made a deposit for option 1 with Gen 2 GTX3076R and recirc tube.

RAIN H8R

Excellent, thank you to everyone who followed through on their word and put a deposit down!

Ptuning

Bump for 9 deposits. Group buy is closing soon!

-Freddy

Memo6453

ill decide by the 1st... i gotta sweet talk the wife... im working on it

RAIN H8R

spdracerut

Curious as to you why you guys are not going with the 3576? It spools within a whisker of the 3076 and makes 50whp more maxed out.

RAIN H8R

Every kit is different. I am not aware of any tested 3576 ptuning kits. 3576 ended up being a nightmare for me with the sos txmaxx, I will not be a guinea pig anymore.

The gen1 3076 can provide between 550 and 600 dynojet whp, this is my goal personally. I have no desire for anything more as Ill have to run a more aggressive clutch, larger than 1300 injectors, and the drivetrain will crumble with extended use.

3076 gen 2 for me.

spdracerut

Every kit is different, yes. But that has nothing to do with the turbo. The issue with the SOS TMax kit is the poor flow of the exhaust manifold as it forced the exhaust flow to make a very tight turn to get into the turbine housing. It doesn't matter what car it is, if you put a banana in the tailpipe, it's not going to run well (sorry, just watched Beverly Hills Cop again recently).

The science of the performance difference between the 3076 and 3576 is simple. The 3576 has a significantly better blade speed ratio compared to the 3076 which therefore results in significantly better turbine efficiency. The increased turbine efficiency allows the 3576 to generate the same shaft power/speed as the 3076 despite having significantly more turbine mass flow (compare the turbine maps for the GT30 and GT35 in the same A/R turbine housing). Remember, turbine power is a function of: mass flow, pressure ratio, efficiency, turbine inlet temperature. Assuming the same turbine inlet temp, let's look at the other variables. For a given shaft speed which is dictated by the flow requirements of the engine, the GT35 turbine will have higher mass flow but lower pressure ratio. Shaft power has high sensitivity to pressure ratio because the PR is to an exponential. So, IF the 3076 and 3576 had the same turbine efficiency, the 3576 would spool slower because it would have lower turbine pressure ratio. However, as the 3576 has much higher turbine efficiency, it spools up nearly the same despite the lower turbine pressure ratio. Of course, the lower pressure ratio is good for power which is why the 3576 makes 50whp more. I've done some analysis where I chose an operating point near the choke side of the compressor map, the GT30 turbine is at a pressure ratio of 4.0 whereas the 3576 is at a pressure ratio of 3.0. That's a huge reduction in back pressure on the engine. There's no voodoo here, pure science.

This is the closest thing to a back-to-back test I'm aware of:
https://www.evolutionm.net/forums/ev...-gtx3576r.html

I have seen data from an Evo X back in 2011 which was a direct back-to-back, same A/R turbine housing, and it also showed identical spool with a 50whp gain on the top end. I can't share that data though. Regardless, the science is simple. It's the same reason the 3067 makes 25whp more than the 2867 and spools the same. Evo X guys have largely sworn off the 3076 as have WRX/STI guys.

If you want s2k specific data, granted there's only a 1 sentence statement and not a dyno chart provided. But the poster has absolutely no reason to lie about it:
https://www.s2ki.com/forums/s2000-fo...ifold-1028207/

As you state you don't more power than the 3076 makes, you could simply run the 3576 at lower boost and reduce the stress on everything while making the same power.

MorngWoodStewie

I imagine the cross sectional area of the vband flange is still somewhat restricting. Can't see it to much because it's open scroll though.
it should spool that 3576 well but with less stress for higher #'s