What turbo for 9:1 compression, GTX28/30?
 

Trying to decide which turbo to go with to get 400whp with 93 gas and meth BUT with 9:1 compression.
Let's not make this a discussion about why my compression is so low!

400whp on 93 is my ultimate goal, but of course I want the best possible dyno curve and response. I'm upgrading from a Precision that has some lag to it.
I do not plan on getting any more power out of it so I could care less about room for upgrading. I'm also trying to do this without E85.
All I know is that my turbo creates a lot of heat at 20psi and I'm trying to get something more efficient. So I want a GTX series turbo.

I've been doing a little research and the GTX2867R and GTX3071R seem like the better of the options. I've been told that the 3071R is the golden boy of the GTX30 series.
I'm just afraid that the 2867R won't be able to produce 400whp at 93octane/meth with 9:1 compression. And even if it did, would it be able to do it efficiently?

Thanks!

@Dipstik-sportech

@diss7

Banned

GTX3076 or go home

BW 7163

GTX55 or go home.

Lol.

A gtx2867r will do 400whp on pump on 11.0:1 comp.

It will easily do it at 9.0:1 on a 20 year old motor, sr,RB,3S,4A,fj. Etc.

You don't need to drop anywhere near that far on a fa.

But to answer your question, yes it will work.

If it's a track car I'd go gtx3071r as the comp would be in better efficiency zones in the high rev range.

If street car with light track, I'd stick to the gtx2867.

Lol...

Sent from my SM-N900A using Tapatalk

theres no reason for meth at that compression. It wont do anything and you wont get response from this motor regardless with a comp that low. That comp is extremely low for this motor. A gtx2867 will produce good torque but the top end is going to fall on its face after 6k because of that compression ratio. You'll need a gtx3076 or bigger. I wish I could remember who it was on here but he was struggling to hit 400whp with that low a compression on a gtx2867r. It will be blowing a lot of hot air.
Im on the gtx2867r and ran it out of its efficiency on the top end with stock compression at 460whp on e85 at 19psi. You'll be running MUCH higher psi on 93 at that comp. Fullblown had a car on their facebook page that was 10:1 on the 2867 on 91 that made somewhere around 400 at my psi I made 460 at, and I made 40foot pounds more torque everwhere compared to that motor.
Save your money, raise the compression back up and go e85. Or you wont the have torque or throttle response youre looking for

Not to be thread jacking, but are there hypereutetic pistons for the FA20? Are the stock ones just randomly cast or do they have bits of silicon in them?

if I remember right dipstick sportech maxxed out at 360whp at 16psi on 91 and 450 at 19 psi on e85 at 9.5:1 with a pte 5858 which should be comparable to a gtx3076.

I think you're overlooking his compression ratio.

I think its not worth buying another turbo when he can just put pistons in it and achieve his result at a lower psi and will make more usable torque. High cr with low boost will be so much better than low cr and HIGH boost. As far as usable torque and throttle response. But OP said he doesn't want to do that. I think he'll end up unhappy since he'll be running too big a turbo to make the hp number he wants.