I have an 03 evo 8 GSR
I wanna get to around 400-450hp

Cant decide whether to go with a bigger intercooler or big cams
with cams I'm thinking GSC S2 and will change springs and the head studs.

Currently running stock cams and the small stock evo 8 intercooler

Current mods
Walbro 255LPH Fuel pump
ACT Streetlite flywheel
Perrin 3" full exhaust system
Gates Perfomance timing and shaft belt
Hallman Pro RX MBC


and I have a TurboXS full piping kit on the way
got a pretty good deal

any advice would be greatly appreciated, even if its something other than IC or cams

 

On pump gas? Cams may get you there. Your intercooler should be fine at the power levels you're aiming for.

 

Whats the turbo setup?

 

Cams gsc s2
And evo 9 turbo

 

Completely stock. I forgot to mention k&n intake on the mods list

 

You wont see anywhere near 450 on either Evo 8/9 turbo... unless you send it in to get upgraded... I'd suggest going FP Black best combination of spool and tq control for a stock bottom end and those power goals are achievable on pump gas with a built head and proper fuel setup (Injectors and fuel pump)

 

If E85 is available in your area try that route first. You'll need bigger injectors, 1000cc minimum.

 

cams for sure...

 

My best advise is to build the head with GSC S2 cam, springs & retainers.
Upgrade the intercooler because it will be maxed out and actually restrictive.
Get at least 1200cc injectors... and hopefully youre running a clutch that has a lot of life still in it...
Besides that the current mods you have can support those HP Goals but for sure need to do something about upgrading the turbo at least or going straight to a FP Black

 

A 9 turbo, cams, intercooler and injectors on E85 can get you into the 400+ range. If just on 93, you'd have to push it to boost levels most aren't comfortable with. I was able to push 30-33 pounds for about 2 years before I sold the car, and it's still running another 2 years later at those boost levels, so I say shoot for the moon.

 

I live in kenya. The highest we have is 93 octane. No e85

 

how is the fp black on spooling..
i dont want something that takes ages to spool. I have a friend who has a tomei turbo that takes forever to spool..

 

i have a new clutch but just the stock one. Hope that is good for what im targetting..

 

Your goals are going to be difficult to get to with the parts you have. If you are looking for killer spool and 450whp, a Black won't be what you want, especially if you are saying your friend's Tomei turbo spools slow.

The stock clutch on a quick spooling turbo might not be a good idea as their torque ratings aren't that great. You might want to lower your standards for your WHP goals and shoot for something a little easier to obtain on the parts you already have. I would shoot for 375whp with the stock turbo and clutch.

Minimum 1000cc injectors
GSC S1 cams
Good BOV (Tial or Turbosmart) recirculated if you are still using MAF
Good tune (This is very important)

The other parts you have listed should be a good starting point.

 

Get a decent intercooler (aka Garrett core) turbo XS is junk. After that you'll want to address the turbo situation if you want 450 whp on 93.... you'll need to go with something resonably sized. An FP black if you're staying stock frame, or a 6262/6266 (i like those old 6262 for a street turbo) if you want to go T3. You can run a smaller turbo if you're willing to run meth injection (since you dont have E85).

So you'll need bigger injectors, bigger cam (S2 or kelford 272), valve train (springs, retainers), turbo of your choice, possibly and exhaust manifold depending on the turbo, and of course a tune. Probably some odds and ends here and there.