You need to understand how a twin scroll setup works, you dont use standard sized housings. The housings need to be larger than what you would think. You also lose very little spool by going to larger twin scroll housings.

Both the gt4088r and gt4094r is available in .85 .95 1.06 and 1.19

With a divided manifold and divided T4 housing

a 2.0L would be best paired with the .95 a/r housing

a stroker would be best paired with the 1.06 a/r housing

You will always use a larger housing when doing a true twin scroll setup.

When people say the gt4088r spool's really slow and doesn't make enough power to offset the lag. They have tried using single scroll manifolds.

Every test I've seen when switching from a single scroll gt35r .82 a/r housing to a twin scroll/divided manifold and twin scroll T4 gt4088r turbo, it gained 75+whp and spooled very much the same.

The T67 P-trim/"37r" has to potential to make a little more power, but will spool slower than a true twin scroll gt4088r.

I was skeptical too when I was approached with this turbo option, but after doing some research, everyone who had negative things to say about the 4088r always used a single scroll manifold. It makes a huge difference.

The 4088r is a great option for someone who wants the power of a "37r" without giving up spool to a 35r. It just has to be done properly.

But, like I said before, I have no experience with the 4094r so I have no idea how much a difference it will make as far as spool and peak power goes.

Do it!

either thats a big turbo and your going to need some high revs to keep that thing in boost. i would suggest a 2.0 with a built set of pistons thats what all the fast cars use right?{thumbup}

This is pretty good advice, however I will note, we have not had much luck with keeping the 4088r steady on high boost. its not as large of a turbo as everyone thinks. I have never seen a 4088r break 700 whp.

the 37r isnt my favorite turbo by any means, id rather have a gt3576

OP, when you talk to Geoff post what he says/recommends, or maybe he'll post in the thread himself.....

is Procco really running a 4067? i thought he would have gone with the 4094.......?

I sent a email to Geoff yesterday, and he answered me after only 2 hours, confirming me what Frenchy4G63 says, a divided T4 configuration gives real and big gains in terms of spool, powerband and throttle response, now, as he had to know if i want to retain air conditoning on the car, i'm waiting for a definitive answer about the turbo i have to choose, i think, from his answer, he will suggest me a 4088R in a own Full race spec, on their web site there is one of these rated for 850+ hp.
When i will have this info, i will post it, i hope to have this answer soon, as i need all the parts for preparing for a track day in april, 10th, and i need some time for tuning the car properly, i'm only a little worried about delivery times for the manifold, as i think it's not a normal production for evos....
Btw i think that full twin scroll configuration gives great advantages in terms of spool, considering that in the past i owned cars similar to evo, like Lancia Delta integrale or Ford Escort Cosworth, that had non twin scroll turbos, and they spooled much later than the Evo, with similar engine specs, i understand that a direct comparison is not doable, but now, in Italy, a common upgrade for Lancia engines is a twin scroll manifold with a TD05-16G Mitsu turbo, anybody knows this unit?:lol: :lol: :lol:

Hey one more option for you I was just thinking about.

I dont know if you've seen the thread but Forced Performance developed a new wheel that spools faster than Garrett's, more low end and mid range with no loss up top.

From what I understand, when testing is done, Dave Buschur is testing the new wheel right now on a 35r, FP will be making the wheels in all of Garrett's sizes.

You could wait until testing is done, hopefully not too long, and get the gt4094r with the new wheel. The compressor wheel on the 4094 flows 82lbs/min so roughly 820-830whp (dynojet) and decent spool and midrange for street use.

Just something to keep in mind..

That's really interesting, where can i have some more infos? It could be a good choice for me.....Thanks a lot....

I did a little research, are you talking about this?
http://linux.forcedperformance.net/m..._Code=AllTurbo

Here's the thread: https://www.evolutionm.net/forums/sh...d.php?t=246400

That's the same 4094r you can get from anyone, there's nothing listed on the site yet about the new wheel as it's still in testing.

Ok,, i'm going to read it, for having info on the new gt4094 is it a good idea to send a email to Forced Performance, for having some more info and release date?

You could, although I'm not sure if they will give you much info on the new wheel.

If you do make sure they understand your asking about the 4094r with the NEW wheel design they(FP) are making.

If they give you an estimate, post it here, I'm curious to see when they will be releasing the entire line of modified Garrett's.

Email sent, now let's wait when they will answer.....:) :) :)

Send me one and I'll dyno it compared to the t67. ;)