GT35R VS GT4088, 700HP?

[TeamH2O]

Which one would be the better bet to go with?

Seeing the GT35R has smaller back ends, does it make sense to use that for a 6-700HP Goal or use the GT4088, and some moderate cams to compensate the power band?

Want something to reach 30psi by about 3800-4400rpm on an NEO RB25DET Engine.

GT4088, has quite a big size back end, so i would say some 272 in/ex cams should work a bit to raise the RPM band to go along with the power band of the turbo.


Looking to port and polish the head as well as put some stronger springs and valves for the cams.

Which should be more feasible?


Please, no questioning about setups, start your own thread, build has started so i want to get some good answers from people who have the knowledge about it. NOT READING ONLINE KNOWLEDGE AND ASSUMING.

[gerard]

nah. if u make it wit the 35r it will most likely be at the limit of the turbo go with the bigger turbo. it will allow u to make the power more efficiently. also a 35r cant give u 700whp.

[firstchoicett]

^


Man know what he saying...

[gt4tified]

Which one would be the better bet to go with?

Seeing the GT35R has smaller back ends, does it make sense to use that for a 6-700HP Goal or use the GT4088, and some moderate cams to compensate the power band?

Want something to reach 30psi by about 3800-4400rpm on an NEO RB25DET Engine.

GT4088, has quite a big size back end, so i would say some 272 in/ex cams should work a bit to raise the RPM band to go along with the power band of the turbo.


Looking to port and polish the head as well as put some stronger springs and valves for the cams.

Which should be more feasible?


Please, no questioning about setups, start your own thread, build has started so i want to get some good answers from people who have the knowledge about it. NOT READING ONLINE KNOWLEDGE AND ASSUMING.

Valvetrain work is always recommended for making high power, for 6-700hp you'll be needing a stage 2 port & polish (3angle valve job) at least. Stronger springs are only really necessary if you're going to be revving way past the stock limiter......or at least 8000rpm and over on a consistent basis.

As said, the GT35R is a wonderful beast but it may or may not not get you up to 700hp, depending on your build. It WILL hold 2 bar boost fine and you'll get that power under 4000rpm but you would have to order it with the .82 turbine side and have the shroud ported for early spool.

IMHO, you should, for good measure, be looking into something like a Precision T63 BB turbo OR a HKS T45s. Good luck with your build and post some pics when its done!

[TESTED performance]

use the GT35R by all means if you like it but you'll be needing at least two of them to consistantly put 700 to the wheels for more than a split second on a dyno. If 700HP is your turf then you should be looking at something like a Trust T88 34D which would give you the kind of power you're looking for with great efficiency and some headroom to play with in case you need to squeeze a tad bit more performance out of the setup.

GT4088, has quite a big size back end, so i would say some 272 in/ex cams should work a bit to raise the RPM band to go along with the power band of the turbo.

that is so wrong i dont even know how to begin to explain it in a way that would put you on the right path. i think that you should consider consulting a new builder if your build has already started and you still dont know basic things like what turbo you are going to use. seems like your builder isnt very familar with high horsepower machines or you wouldnt still need to be asking these questions.

[TESTED performance]

i'm not familar with nissan engines so i'd like someone to confirm whether or not the OE throttle diameter can flow enough cfm to sustain 700WHP please. jus curious.

[OldSkoolRule]

the 4088 would be a more efficient unit compared to the 35r, in that charge temps would be lower for the same psi. the larger back-end would also reduce back-pressure, however, it may also spool a bit later than the 35r. but i think the 35r could flow enough to support the 700hp, but it won't last very long. my advice, go with the 4088, btw, what A/R ratio were you considering?

[TeamH2O]

neither turbos gonna be properly for the application, found another turbo thats perfect for that power, altho its made for more, should'nt be too much stress on teh turbo since it'll use like 65-70% rather than maxing out the turbo

Also, turbo is not the only thing makign the power if thats whats on the minds of some, theres alot of work gonna be done to get this fine tuned to get that power on the ground properly. Not really on the dyno thing, want it tuned on the parts going in and at the boost level specified, then afters its all smooth and working, i'll dyno and whatever power, that'll be it set

[nismown3d]

neo head will get crunched trying to run that much power, it's better to use a non neo head.

both of those turbos are out of their efficiency range if you're trying to make 700. you need to run at least a 42 frame.

how much money are you wanting to spend?

i suggest building a Tomei RB28 (roughly $15 000US) and going with a turbo like a GT45R if you[re really serious about building a 700HP RB25.

i've got a friend thats already $20 000 CAD into an RB26 build, for a 900hp aim, making that much power isnt cheap.