Their both about the same price. Their should be enough people with they by know for some input. I would imagine there might even be a working engine that has been dyno'd to compare them. I'm leaning towards the GT but then I requested the 46mm wastegate because it's made of nickel and Teal claims it will hold up to a turbo rotary. Is this a waste of $150? Anyhow, i'll be running 850/1300's and not shure if I will get a Cosmo pump or the US one. I have the PFC. DOn't have a bov, fpr, and i'm shure theirs more I need. Apexi FMIC, engine has large streetport. https://www.nopistons.com/forums/pub...R#>/unsure.png

if you're gunna get the gt35r with a t4 exhaust

I'd do the r85 because it has greater power potenital if you ever feel like turning up the boost.

I'll never turn up the boost more then 16lbs. Gas is allready over $3/gal and race is is $10/gal. I don't want a dual boost setup. I want a treetable sports car, not a barely tolerable race car. Closer to a Ferrari then a Porsche. I still want some luxary in the ride. I love my A/C and I don't want the hoochies complaing about the noise and the stiffness. I want a fun go kart response. Instant power, most effiecient, esily spooled, most reliable, most fun on the street and weekend track.

So which did you decide to go with? Heavily debating between upgraded twins and a Gt35r myself.

I say R85 all the way, but I have different priorities than you. Maybe think about something other than the 35r if you only plan on running 16psi.....

gt35r is a damn good turbo

Oh yeah... you dont need an fpr if you're using the stock fuel rails

Decided on the GT35R from A-Spec (A/R=1.02, gate to dp, heat coated). I am having a custom shortie T4 devided manifold. Pricewise, there about the same but the 35R may be alot quicker spooling and more efficient. I don't care about being able to run 20-30lbs. I can't wait to slap er in and take er for a spin! https://www.nopistons.com/forums/pub...1047683473.gif

fortyounce got close to 400hp+ with that turbo on stock ports

Thats what I'm shooting for. Ballpark 400rwhp at 14-15lbs with a large streetport. And reliable enough to daily drive if i so choose.

If you are shooting for 400rwhp at around 14-15 psi then I would say get the GT35R. I think you would get that power pretty easily with the large street port since some guys were getting 400 rwhp at 15 psi or so with the stock ports. Most people with the GT35R run it around 15psi I think but one guy over on RX7club was upping the boost, he thinks he can hit 500 rwhp with boost slightly over 20psi.

GT35 51mm = 42lb/min @ 23psi up to 390 rwhp

55mm=52lb/min@26.5psi up to 475 rwhp

maybe gt 40 or 62/1 turbo be better.

The GT35R which he is looking at is 68mm so it is capable of more power than that GT35 you are referring to. At the boost he wants to run he will get 400 rwhp and really fast spool with the 35R.

I say GT42R/T6 frame......... https://www.nopistons.com/forums/pub...1047683473.gif

You would. https://www.nopistons.com/forums/pub...R#>/tongue.png

I don't know much about the R85 but it does offer more room to grow over the GT35R.