As far as I know, most of the 'enhancements' are compressor housing upgrades and new turbine housings. Will be nice to see some back-to-back comparisons to see what this adds up to.

 

Looks like that SIR company is stuffing them in OEM housings.

SiR GTX Gen 2 Turbos – SprayItRacing

 

That's easy to do, you could make a 'bolt-in' OEM location for the Subaru too, just get the ATP compressor inlet and turbine housing. In that pic you can see they are doing the same thing, using an IHI compressor housing.

I guess the point I'm trying to make is that OEM housings already exist, since they are 30/35R CHRA and GTX wheels.

 

I wonder how these will compare to the new htz line up then.

 

How is a 2867R gen 2 making 550hp when the compressor map stops at 48lb/mn? The wheel is smaller then a 2871. ( I don't know that much about garret turbos and am just learning how read compressor maps.)

 

I don't understand how the 2867 is going to make that much power either. If it can really make that kind of power it could be the turbo to own on these cars. 10hp less than the 3071???

 

Looks like ATP's got them now: GEN2 - GTX3076R Bolt On Turbo Kit for Subaru WRX/STI, Internally Wastegated : atpturbo.com

 

And of course I bought a GTX3576 just before these came out... *mutter* *mutter* *mutter*

 

"Marketing". The truth will be in the dynos.

 

They are based on compressor maps, and since they both use the same compressor wheels, they can flow the same amount of air. A turbo has two wheels and this only tells half the story.

IMO there's no reason to use a 3076 on these engines (bore/stroke, design, etc.). These engines have been shown time and time again to provide a MUCH better and usable power curve with a bigger hotside. Case in point the 3076 and 3576 spool within a couple hundred RPMs of each other, but the 3576 make +150 more WHP, and has the potential to carry the power much further into the revs. This is all due to the reduced backpressure the much freer flowing 35R turbine housing provides.

 

That actually doesn't explain the confusion whatsoever.

Again, the table states both are capable of a max of 750hp, but to get to that same 750, the GTX3576R picked up 150hp while the GTX3076R picked up 110hp. They are inherently stating that the max output of the Gen 1 GTX3076R and GTX3576R were 640hp and 600hp respectively, meaning the GTX3076R was capable of 40hp more than the GTX3576R. That does not add up.

 

Thanks for explaining the comparison

 

I already put in an efr 6758, I can't imagine a better power curve for a near stock block then that.

 

Should try something with a billet 71mm comp wheel with the 58mm hot side on a dual ball bearing cartridge. Near identical spool with capability to hit higher than 450whp on e85. Do IT.

 

Pulled the trigger on the gen 2 gtx3071r. When my build is done and motors properly broken in i will post dyno results. Car has made 330whp and 370wtq on this dyno previously with stock turbo.

 

did you ever get the results of this

 

Nice! Looking forward to seeing your results.

 

Update to your GEN 2 GTX3071R build?

 

 

My 15' STi with GTX 3576 Gen II is on the dyno today. Pump (94) and E85 plots to follow.

 

Awesome. Sleeved or closed deck? Injector size and boost target? My gen 2 3576r is at 28.5psi limited by the stock sleeves and semi closed deck case halves. Still i made 550whp on e85. Good luck!

Sent from my SM-G925T using Tapatalk

 

Very excited to see your results and hear your thoughts after driving it a little bit!

 

Also, in addition to SlowInFastOut's cam question, I am curious why you went with HeadGames vs. IAG? And where is your new redline set at?

 

Well the results are in and they are awesome.

512 awhp and 400 tq on Petro Canada 94 Octane at 25 pounds of boost.

653 and 550 on E85 at 32 pounds of boost

The Cams are GSC Stage 1 cams.

Intake 266 / 225 @ .040" / Peak Lift 10.8MM / Centerline AVCS
Exhaust 264 / 222 @ .040" / Peak Lift 10.4mm / Centerline AVCS

I have the radium surge tank along with all the required mods really.

I have the plot. But was asked not to post it until the tuning company can apply their watermark.

The peak boost is reached at 4300 RPM along with max torque and they go all the way to redline of 7800 now.

 

Well the results are in and they are awesome.

512 awhp and 400 tq on Petro Canada 94 Octane at 25 pounds of boost.

663 and 550 on E85 at 32 pounds of boost

The Cams are GSC Stage 1 cams.

ntake 266 / 225 @ .040" / Peak Lift 10.8MM / Centerline AVCS
Exhaust 264 / 222 @ .040" / Peak Lift 10.4mm / Centerline AVCS

I have the radium surge tank along with all the required mods really.

I have the plot. But was asked not to post it until the tuning company can apply their watermark.

The peak boost is reached at 4300 RPM along with max torque and they go all the way to redline of 7800 now.

Beautiful! Enjoy responsibly! Great to hear that it did well.

Sent from my SM-G925T using Tapatalk

 

That's insane. Can't wait for the plot.

 

Awesome! Really glad for you it turned out so well! E85 is magic for sure! Would love to hear your impressions after driving it for a couple days and looking forward to seeing the plot as well.

 

Here are the Graphs

 

Badass!

One question, where are you getting E85 in Toronto?

 

You cannot get it at the pumps here. But you can buy E100 in barrels.

1/4 tank 94 Octane and then 3/4 E100. Viola.

 

Nice job! Touge and Sasha FTW!

 

The other half of the equation?

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