Maybe I'm off on the boost. I just know it runs well.
Even my stock engine would make over 400wtq at 3800 on the dyno. This is my 2.2 mivec on E85. 28-30psi 3rd gear

 

Any EVO making 200 ft-lbs under 3k I consider a street turbo setup. Abacus - your setup meets that while still making 600hp !!!!

 

Abacus,

G25-660 has small turbine, presents backpressure, similar to FP Red in many ways. So FP Red makes sense.
Check this dyno, post number 257 for Built 2.0L, stock cam Evo9, G25-660 .83 A/R Vband setup.
https://www.evolutionm.net/forums/ev...turbos-18.html

Let's consider that many of us if not most of us, do not have reliable access to E85: 91/92/93 gasoline is best performance metric for real cars driven everywhere.

I am not aware of any road course selling E85, and where I am in California- driving Backroads on E85 is impossible as there are hardly gas stations, let alone any offering E85.


Shawn Kresbach - our Evo 9 Time Attack competitor - used very successfully G30-660.
He switched to G30-770 and the lag (on 2.2 Mivec) was so bad in comparison, that his terminal speeds were same at end of straights, so he switched back to G30-660.

For Roadcourse I think G30-660 or EFR7670 are great choices, in twin scroll.
Although for reliability reasons V-band is highly appreciated- and there choice may narrow to GTX3076 Gen 2 for 2.0.

I wish that FP Red could be had with less backpressure: is there such a thing? Something stock frame twin-scroll FP red response/spool but less backpressure?

 

For this, I have always looked at a twin scroll T3 5858/5862/6062 setup to as close as you can get. It should offer less back pressure with similar performance I think. There should be some dyno charts in the dyno section of these setups in the dyno section I believe.

 

I'm not saying the FP red is the end all be all, its just a strong contender. The New Garrett stuff is promising. This is what sold me on mine from way back. Filmed with a potatoe cam.
That car dominated for a few years in its class.

FP red HTZ 57.3mm CW and 58.8 Exducer , then its choked in a factory MHI housing so its got some backpressure. IIRC my stock cam 2.0 at 30psi boost had 39psi backpressure. Not bad, but EGT was probably warm.
G30-660 54mm/55mm with a better flowing housing

You can see that 660 dyno tapering up top. It was on E85. A small turbo acts like a small turbo. Who knows how well that car was running or what boost it was on. Still performs well but for people like me that like the stock sounding exhaust manifold the red works.
I also want to mention how competitive RS motors was on an FP green MHI in the Tire rack classes for many years. Larger turbo's were available but the low end punch of the green worked well.

As far as Ethanol is concerned. I'm sorry its not readily available where you are.
There are a few stations where I live but I also run One Ethanol S by the drum for my other car. So I always have some on hand and use it within 4 months. In the past I also filled up some drums at the station . PITA but race car performance and knock safety are nice things to have.

Ethanol is cheap insurance when it comes to keeping the heat/knock away. I strongly suggest it for any high back pressure or road course adventure.

The G30 660 /770 and even the Gen 2 3582R work well at the road course or street. It just comes down to what you are after.

 

Speaking of e85/heat/back pressure: I've been at 28psi on an HTA71 for a number of years now. I only do 20 min sessions, though.
I largely credit e85 to the longevity of my setup.
It can be a hassle, but worth it, IMO.

 

E85 solves a lot of problems.
I like to drive the car for hours on uncharted roads, or charted roads, and on E85 range is 160-200 miles on our gas tank.
Carrying extra full tank of E85 is not an option.

So pump gas it is. California Backroads are amazing, and on them FP Red is total animal on pump- you don't need even the power it can make, let alone more.

It's in my mind, like yours Abacus(Tim), top choice. It's almost "smog legal" in California if you can mask it a bit.

I basically observed G30-660 seems to choke too early, G30-770 is too laggy, and that makes older GTX3076R Gen 2 still a great fit between the two, in single scroll track safe performance.

This is rumbling, but the way I see it. I wish somebody would make V-Band Twin Scroll turbo size of 3076/EFR7670 to have on 2.0-2.4 all the power and least lag, with reliability to tackle track mercilessly.

 

If your running 93 octane (or worse) then perhaps throw DISTILLED WATER at it too? Like KAJ I have been running a 20g style turbo for years and love it (basically what the HTA71 is). I am about to install a GTX3076R Gen2 (twin scroll) and am concerned that I will disappointed by the streetability. The GTX30 turbine is inferior to the new G series, and I only went with it to stick with a nice cast stainless twin scroll manifold. If your not locked to a manifold like that, then I would skip over the GTX30 (gen anything) and go for the G series.

 

If you haven't bought the turbo yet, I'd highly recommend doing the 3071 over the 3076.
The 76mm compressor is too big for the 30 series turbine.
3071 will spool faster and is capable of making ~600whp on a dynojet

3071 Gen2 is 54mm compressor inducer and 55mm exhaust exducer.
Flows 58lb/min max.

G30-660 is same compressor inducer and exhaust exducer.
Flow ~59lb/min max.

 

facts right here

 

From all my research it has basically come down to the FP Red or the G25-660R from GCG Turbo. Both have very similar wheel sizes, FP Red has a slighty higher flow rate if I remember correctly.

My main goal is to have a very responsive and snappy powerband along with being able to make power until redline, yes I have recently started to realize that around the 600whp mark it becomes more or less of a trade off between spool and power.

From my research it seems that the FP Red has more power output, but the G25-660R has a snappier response and also can peak until redline. The GTX3071 is also another one in the same playing field, ofcourse with a slighty shy flow rate than the G25-660R

I consider myself more of a spirited driver, have more experience and seat time in "quick" cars such as the GTI's, and also enjoy the touge and circuit runs more. My Evo currently is paired with a GTX3584RS and is a total polar opposite in every single way I drive and enjoy driving. However when that b***h hits boost, it really starts flying. Makes 650whp at 38psi on a mustang dyno.

I am also gonna run this setup on meth aswell, I know in Canada our gas really sucks so without meth or E(almost impossible to get in a good quantity) the power is significantly lower than expected. Any feedback or comments would be appreciated, Thanks.

 

Consider the 55mm or 57mm offering from Art Gennari Turbo AGT . FP Red performance and reliability at a much better price.

 

It would be cool if you could drive a car with that setup before you commit to purchasing. Even with e85, you might find a bit more lag than you would like, based on what you say you like to do with the car.

 

Lol what do you know about lag Kaj lol? If a red has lag then wtf do I have? I make 12 lbs of boost by what 6000,6500? Lol fp red laggy lol

 

I never heard of AGT but since you suggested I checked them out and it looks really promising. Thanks for the suggestion, am going to consider this one too before making a final choice.

That would be pretty cool, however from my research this setup is not extremely common to begin with and totally unheard of where im located. Another thing is my GTX3584RS actually hits boost around 5500RPM, so already the G25-660R will be way more responsive then what im currently running.