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Originally Posted by TRD_07
Given all the dynos we've seen with the gtx2867r we know that this turbo works great on this platform but it seems like everyone is skipping the gtx3067r and jumping straight to a gtx3071 or gtx3076. Is this simply for the future proof overhead? The gtx3067r does have a little more room than the gtx28. I'm curious if anyone has tried the gtx3067r.
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The GTX2867r has been used by many with good results, but the ns111 turbine is best suited to the 63r compressor. The turbine starts to choke when using the larger compressors, but on some engines it has decent results. It's certainly much better than the gt2871r! The GTX2867r is a pretty well matched turbo with lots of potential.
Likewise, the T30 wheel used in the GT30 is well suited for the gtx67r compressor, or even the GTX3071r compressor. But the turbine is overwhelmed by the flow of the 76mm compressor in standard 6 blade or the 11 blade form. The turbine is simply too small imho, and you'd be better suited to the T350 turbine for the 76mm wheel. The GTX3576r is a great turbo, with near perfect balance.
Managing the backpressure on these setups will help keep temps down, and the NA profile of cams will like the free-flowing exhaust wheels. It's my expectation and opinion that the GTX3576 with a .82 exhaust housing will be an absolute riot to drive and perform excellently. 600whp potential with great response.
If you are looking for the absolutely most responsive turbo for 300-330whp, I would probably suggest the disco potato. I haven't tried the GTX2860rs or the GTX2863r personally, but have seen some miatas with these fitted making ridiculous power for low boost and just nasty responsive.