dionkouki

Thinking out loud here so if anyone would like to correct me or add feel free. I was considering a GTX3067 for my RB25 however the results so far are confusing. I currently have a 56 trim gt2871 and making 320whp on a mustang dyno. I would expect the GTX3067 to make more power but perhaps it has to do with different mods or possibly the power difference I've read about (AUS vs USA). The thing that confuses me is the GTX2867 has been shown to hit 400whp and more on 2.0 liter motors as Lithium commented on. A tuner I talked to mentioned he's tuned several 2.0 liters with the GTX2867 and was quite impressed that they were hitting these power levels. Keep in mind most of these are running 92 ocatane. Is the GTX2867 just a better turbine/compressor match? I would think the GTX3067 turbine wheel would be better suited to a rb25 plus I could actually get a Garrett T3 GT (3" outlet) housing instead of the T31 (2.5" outlet) I'm limited to with a T28 frame turbo. Another point, RB25s over here are reaching 400whp or close to it with GT3071 so why is the GTX3067 having so much trouble. The only other detailed results I could find were for someone that is building a kit with a gtx3067 TIAL .63 A/R for subarus hitting 350awhp. Similar to this thread it had great response, just lower power than expected. Now that I think about it that subaru was running an oem TMIC and getting heat soaked, so perhaps there's a little more left to be gained.

I'm in the US. Washington. E85 isn't available in my area. Thanks for the suggestions. T3 to band sounds like a good fit. Not sure if running TS T3 to T4 would create too much lag, but I'll do a little more research on it before I pull the trigger.

Wow, a lot to absorb in this thread. I saw a couple people posting stock rb25 manifold questions. Appears the EFR 7163 is the sweet spot for power and response I'm looking for. Thoughts on the best turbine housing option since T3 isn't offered? Getting the t25 housing and using a t25 to t3 adapter seems easiest and provides a spacer but I always thought that would be shooting myself in the foot. Choking the motor with such a small turbine inlet. V band .85 housing is closer to a T4 if what I've read is correct which seems too big for the response I'm looking for. Around 400whp, 18 psi / peak torque around 3500 rpm on 92 octane. Similar to what the Subaru on the Perrin website was showing. Any suggestions would be appreciated. If a t3 option is in the works I can wait a little longer. Don't know why the 7064 has a t3 but the 7163 doesn't. So similar in size. Must be more involved than I realize.