Hi all,

I'm running a full race twinscroll divided t4 front facing manifold on a f22, and was wondering what the fastest spooling/most transient turbo for 550-600 hp these days is. I was thinking about a BW 7163 EFR w/.8 AR but not sure if I should consider a different route.

Appreciate your help and advice.

 

Garrett gen 2 gtx3071r with the t4 divided 1.06 turbine housing.

 

Hey bro, whats the lag look like on that setup vs a GTX35r with a .63A/R exhaust housing? Its been great seeing your car's progress.

 

That turbo will not meet your goal although it will spool stupid fast. I ran the 257sxe (EFR7670) for awhile on a F24 myself and another guy with the same motor setup but he had a gtx 3076r our dyno graphs looked identical...except the 257sxe was only like $700...

I Tried a .83 housing and a 1.0 housing. both twinscroll. The .83 is too small, it will choke up at higher boost levels, but would make boost leaving a stop light..was nuts. Was able to achieve 594hp with a 1.0 housing and it still had great spool time

 

Very interesting I just did a forum search (where I saw you post) about the 257sxe and how it made mid 400's on 12lbs of boost. That's very impressive. I was actually leaning on the 1.06AR Gen II GTX3076r but the price difference between the two is jarring (nearly double for the 76r). Now that you mention that the dyno graphs were nearly identical I can't stop but wonder if it's worth it. Was it a fluke? The 76r should have a more transient response than the 257 but their spool and power outputs are the same? Wonder what you guys think.

 

Transient response will inherently be better as the 3076r is a ball bearing turbo....But being that they are so small, I doubt the difference would be very large. But if I were you and were going to garrett. I would skip the GTX series and go straight to the G series as that is the newest. A g25-550 or 660

 

Not sure I would bother with the 550 on the F series, the G30-660 sounds like it would be a great fit for a stock F22. Although he would then be looking for a new manifold, the G series turbos are only single scroll vband.

 

The GTX3076R is a mediocre turbo due to mismatch in wheel sizing. This leads to a poor blade speed ratio and therefore poor turbine efficiency, so the spool sucks. Either go GTX3071R, or GTX3576R which spools the same as the 3076 but makes 50whp more on race gas. If you want super crazy spool, G25-550 in the 0.72. G25-660 for a bit more power. The G25-660 is a bit mismatched, but jumping to a G30-660 forces you into a 0.83 A/R which will slow up spool a bit. Though the G30-660 in the 0.83 should spool better than the GTX3071R in a 0.82/0.83 and make the same power. Or step it up a bit more to the G30-770. I wouldn't use the 0.92 A/R (G25) or 1.01 A/R (G30) on anything except big V8s using a pair. I don't think the G-series is available in twin-scroll yet.

 

Wadsworth is using the 550 on his track car, he said it worked amazingly. I heard that T4 housings came out recently. Not sure if its aftermarket or not, I have yet to see them though.

 

Interesting, from what I saw on both the 76r and 71r's compressor maps the 76r looked more efficient for an F22. Also the g25 and g30 do come in OPEN t4, my fullrace manifold is divided/twinscroll t4. I figure it would be better for me to utilize a turbo that has a divided turbine housing like the gtx 30's (although i'm not sure), would the divided manifold -> open g series turbo be the best setup? I am also worried about running the 71/76r in .82/.83 i have heard it will choke up top and not make my goal 550 wheel hp.

Thanks you everyone for your input!