My car is doing 258hp on 16psi.
Its street tuned and the engine idles pretty well in the traffic lights, thanks to a haltech e6x.

But i want more power.

Under 4000rpm.
I want more acceleration

5000rpm - 6000rpm
More top end HP closer to 300hp.

I reckon, I've bought every single car parts available.
airram, 65mm TB, head P&P, camshaft etc.

I'm waiting for Patreezy's MSD ignition system to arrive on the mail.
Then I'll get it installed and dyno tuned.

Any other upgrades, that I haven't thought off?

 

exhaust? 3 inch mandrel bent.

 

what about a 50 shot of nitrous at WOT @ like 3k? Itll give you a lil low end boost and cool your intake charge

if you dont want to mess with nitrous injection, what about cryo cooler on your IC? you can get somewhat nitrous like gains safer.

LSD for better launches?

more boost? wink1.gif

 

Any cam change you do is going to mess with your goal.
A cam for more low end power is going to mess with your high end power.
A cam for more high end power is going to mess with your low end power.

Right now, I would blame your horribly innefficent turbocharger.
258 WHP out of 16 psi isn't that great considering the mods you have.

I would look to upgrade the turbocharger to a GT25RS or GT28RS ball bearing turbocharger. They would spool faster giving you more bottom end sooner, and they would also have more HP potential, giving you more on the top end.

I would also take a good look at your exhaust manifold design, intercooler and charge piping. See what you can do to make the system more efficent. Maybe duct air to the intercooler, widen out the bends in your piping if necessary, or shorten/straighten it where possible. Move to a more efficent manifold design too if possible.

Those changes should easily get you over 300 WHP.

 

* cryo cooler.
Had another guy test this on their nissan silvia.
He thought it was a waste of time.

* my previous turbo was garrett gt28rs
I sold that turbo and upgraded to gt3076r
acceleration and turbo boosting is about the same

* exhaust
upgrade already two months ago.

* intercooler, manifold, piping.
could be the piping?
I'll see what I can do to improve it, 2.5 piping for the intercooler.

* nitrous
very tempted, but too many people are saying its too dangerous and unstable for the engine.
at least the turbo is now working well.

another six months, I'll have enough money to pay for the labour to get the forged pistons installed.
I just received the forged CP pistons this week.

 

Okay, if you're running a GT30R and you're STILL only seeing 258 WHP out of 16 PSI, then I've got to blame one thing. Tuning.

Do you have a wideband 02 and a EGT probe? If so, what is your A/F at WOT? What's your EGT @ WOT? Where is the EGT probe mounted?

What Compression ratio are you running? What pistons?

 

I would definately agree with getting a smaller turbo. your definately taking too long to spool up that gt30 and with how little boost you are running compared to what it can put out for our engines your probably not in its best efficiency range either....if you can give me your turbo's specs i can plot everything opn your compressor map and show you where you are efficiency wise and i could show you the best fit for around 16psi if you want me to do that too.

 

Are you still running the stock pistons and compression ratio, if you are that is most likely your problem, at 16psi with the stock pistons you would have to run very rich and your timming must be retarded alot just to prevent detonation, that will prevent you from reaching your power goals cause you will not be able to tune for max power, with stock pistons at 16psi your tuning you would have to tune just to keep the pistons from melting.

After you install your new pistons that are forged and a lower compression ratio it will allow them to tune your car for more power with a leaner fuel mixture and more advanced timing and that will make a major improvement.

What cams are you running, some cams are meant more for NA puposes and will have to much overlap for turbo use, this can be fixed with a set of adjustable cam gears, you can retard the intake by two degrees and advance the exhaust be two degrees to help eliminate some of the overlap between the two, the wrong cam choice can kill a turbo setup.

And nitrous can help out allot, if done the right way, after you install the forged pistons, it can be used and it's not as bad as most people make it out to be, nitrous works great on turbo setups, I have seen people use a 50hp shot and get more than that to the wheels out of it, the extra cooling of the intake charge plus the small amount of nitrous can create some nice power if done corrtrectly.

 

So true^^.

With stock compression, they HAD to tune it rich....


Well, put your new internals in, and ...... Try to take out your cams... Maybe they are not that right for your application...


Good luck!