Why wouldn't you opt for the GTX3576r instead? Better wheel matching and better flow. Spool difference is extremely minimal considering the T350 turbine is a overall better and more efficient design than the T30.

The T30 turbine does well with the vband housings.

I honestly didn't consider it.
I was between the 3076 and 3582 and between those two there is noticeable spool difference and since I didn't plan to go over 600 whp anytime soon stayed with the 30

Sent from my SAMSUNG-SM-N900A using Tapatalk

I have extensive experience with the GT3076r, but the GTX is a different animal. Would love do testing on a .82 vband setup with the GTX, as the .63 housing is not my preferable choice for that turbine wheel. It would be interesting to see how this turbo reacts to different cams as well. But 550whp is really cranking on that turbo for stock cams. Congrats on that power number. I've never seen a GT30r hit anything over 480whp In Utah. Turbo just runs out of steam. GTX may be a different story, as it handles higher pressure ratios much better than the regular 76mm wheel.

Would be crazy to see the power this engine would make with a 6262. Probably would only be worth it with cams/springs and a 9k redline. That would be insanity right there. Engine would need extensive work.

Look at fullblowns car that's what they ran at 25psi to hit 760whp

Perrin Performance in wrx

Pre Race brz

Revvolution brz

Ptuning brz

Dynosty brz

Interesting to see Pre Race, Revvolution, Ptuning and Dynosty All used GTX3076R in their tuning for over 350whp.

The GT3076r should perform well on lower boost levels, but I think the GT3576r will perform better all around. This is purely based on my experiences with the GT3076r and it's downsides in comparison to other turbos in that frame-size. I haven't used the GTx3576r myself, I'm just a number cruncher and theorist at this point. But if it's any consolation, I have been spot on with my predictions in the past...

I believe the hit to response from using the larger turbine would be offset by pairing the larger turbine with the 76mm compressor. The turbine with the longer moment will drive the larger compressor more easily with less backpressure in the housing. Pairing the .63 housing to the t350 turbine will help offset any loss to response while still flowing better than the T30 turbine. Also, surge would be reduced which would help low-end power. If the GTX76r compressor wheel could be had without the ported shroud housing you could gain some efficiency back by switching to a non-ported shroud.

I feel like a lot of decisions are made based on what is popular or has been used a lot in the past. It would be nice to see more data and science to determine which would be the best match for a particular setup. Of course, it probably won't matter on lower boost levels, but I like to geek out over this kind of stuff.

Now your making me want the GTX3576r, I wanted the gtx3076 originally but now I dont know

Thanks so Coheed :-)

I personally preferred the GTX2863 over the GTX2867 based on both dyno results and driving results. Had em both on the car. I have driven several and worked on several with the 30 series on them of different variants and still prefer the smaller 28 series assuming you plan to stay sub 450whp. Response is basically instant regardless of RPM and it eats up far less real-estate in the engine bay. At the end of the day there will be several good routes to go and it will come down to type of use the car will be exposed to and personal preference.

What A/R are you using on the 2863? The .64 A/R Tial? How is the spool and response compared to the 2867R? I agree both turbos are more than enough for almost everyone.