Well, be careful here.
A 35r @23psi of boost will put down more peak whp but a 50trim @ 23psi of boost will put down more power in the low and midrange parts of the powerband. For instance < 4k rpms the 50trim will be putting down more power.

The 35r debate is you have more powerband to offset that low-end loss to rev your gears out more.


My opinion (and I've posted it many times) is if you don't plan to build the bottom end or run race gas don't get the 35r, 37r or 42r. Period.

 

I would take the 50 Trim.....

 

+1 for maxing out your stocker first running meth kit and every supporting mod... Maybe you should save money until you have enough to do both a stroker kit + 35r + other supporting mods u will need at that point... you can make big power up top with less lag. If you dont want to end up building your block wait until u are to swap to a large turbo.

Also, nobody has said this yet in this thread, but after maxing out your stocker with meth and all bolt-ons make sure the rest of the car is tuned to handle that kind of power- beef up your brakes and suspension setup, keep your car balanced all around and be able to control that kind of power before stepping it up to the 500whp+ mark, because street driven car goes in a straight line all the time

 

+1. But I still think that with almost all the mods needed and alky injection a gt35r will be a great turbo even without building up the motor

 

I ran stock block with head studs, hks cams ,gt35r, meth,stand alone,28 psi
boost for 34000 mls what a blast.At that point it had 74000 mls on it and #4
piston gave up a little peice . Now with 2.3 and some other goodies and
running 35 psi with meth it is just stupid fast.

 

I think what people forget is, with a 35r you should really build your head so you can rev higher. You'd want to ring it out to 9k to benifet in my opinion. Shifting at the stock rev limiter will put you out of the sweet spot in the power band. A 50 trim is perfect for the stock rev limiter in my opinion.

 

I have just ridden in a 35R Evo IX with Meth, it is to die for. On the STOCK Bottom end it made usable power from 4300 ON, it was so god damn fast and made 520WHP on 28PSI, very cool efficient boost at 28PSI too at over 500WHP, the 50 Trim simply would not be able to make this whp. Immagine 30PSI, probably 550WHP and it just freaking moves, GT35R by a MILE.

 

So basically a built motor and a 35r is the answer?

 

50 TRIM FTW..............

 

GT35R = 600 hp pump, 700 on race (at the crank)

However, to get numbers like those, you need at a minimum cams, headwork, intake manifold, ported throttle body, intercooler, more fuel than a single walbro, injectors, clutch, standalone ecu, alcohol injection, the right turbo kit, 3" exhaust at minimum, and very likely, a built bottom end.

You will probably make full boost (~30psi) at around 5500 rpm on a 2 litre.

With this setup you're making the car much less responsive under 4500 rpm. Now if you have ALL the supporting mods, then I think it is worth it. But if you are doing it on the cheap, I sort of think you won't be making enough power up top to make up for what you lose down low.

In my opinion I'd stick with the standard turbo until you can really budget for doing it the right way.

 

I have a fully built 2.0 with a 35R. It is a purpose built car, and does what it is supposed to do very well. It does not have nearly full boost until nearly 5000 RPM, and redlines at 9000. Anyone thinking about a 35R should drive and ride in one before going that route, because you do lose a substantial amount of on boost RPM below 5000 that you're used to having with the stock turbo, or a 50 trim.

What will make you happy depends on your needs and use. If you are looking for the ultimate in accelleration after 4700 RPM, the 35R (with the proper supporting mods) will overpower the 50 trim. A 37R will overpower the 35R. A 42... well, you get the picture. However, each of these "upgrades" narrows the useful RPM range and moves it upwards.

At anything over 450HP, you should start being concerned with the longevity of your stock rods, and particularly, stock rod bolts. You'll also need supporting upgrades, like fuel system, ECU or standalone, intake, etc. etc. etc. At anything over stock redline, you should be concerned about your valve springs and retainers.

Overall, if you want a pure drag car, there are cheaper ways to get into the 10s than with an Evo. There are MUCH cheaper ways to get into the 9s or 8s.

If you want a balanced fun daily driver, you might consider the Wartalon genre, with some bolt on engine mods, decent 1/4 mile times, some suspension work, and still reliable in all ways.

Hope this gives another perspective. I still love my car, just wanted you to understand and consider the tradeoffs you'll be making.

 

Just gut the car, bet that'll get ya goin fast, and likely be cheaper than a turbokit

 

Yeahbut don't forget that you are in Colorado, abotu a mile up and with that 20% less air making yoru GT35R lag way more. Down here at Sea Level I have seen a GT35R fully spool at 4300RPM's in 3rd gear on a IX, it was VERY fast and VERY responsive. I couldn't believe it.

 

+1

Me too

 

35r + meth for Digs


50 trim + meth for rolls