im making 440 on 94 with a 1.06 hotside 14psi and 2.5" exhaust. I want to break 500's so I plan on getting a 3" exhaust and a bigger turbo. Think it's possible? Stock motor btw.
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Absolutely. The only thing limiting you would be the 2.5" exhaust and octane. Other than that, your GTX-3076R is definitely capable of breaking 500whp.

In case you haven't seen it, below are a few of our customer's build thread making 500+whp with our ptuning turbo system, on a GTX-3076R and our 3" turbo-back exhaust (single and dual):

www.s2ki.com/s2000/topic/788561-ptuning-s2000-turbo-system-pics-dyno-pricing/page__st__900

www.s2ki.com/s2000/topic/853867-ptuning-gtx3076r-build/page__st__25

www.s2ki.com/s2000/topic/839183-eternallxs-turbo-build/page__st__150

www.s2ki.com/s2000/topic/881684-batbites-ptuning-kit-golden-eagle-block-speed-factory-built/page__st__50

MrC

 

My graph. I kept it conservative with 12 psi boost on 91 octane. Pretty happy with results, 431 rwhp and about ~283 lb-ft torque on GTX30R

 

^ Those are great numbers with 91 octane on a DD dyno. How do you like the new power?

MrC

 

I forgot to say id like to break 500s on pump gas so no higher than 94. Everyone ive seen above 500 is eIther using meth And race gas or e85.

 

500whp on pump gas with stock compression will be tough.

 

I think it's a possiblity, the question comes down to what dyno and how confident you are with your tuner pushing limit of pump gas. I definitely don't think there's enough octane in 94 pump gas to break 500whp with a stock motor on our dynodynamics dyno, but it's definitely achievable on some higher reading dynos. But then again, you're pushing the threshhold of power on pump gas and that's probably not ideal if you use your car for daily use. It's like running your injectors at 95-100% duty cycle when you should stop at 80-85%.

MrC

 

Hmmm, it looks like its not even worth it to upgrade to the 35r. I wanted a bit more power for next year but dont wanna run race gas or do a hg. How much of a gain u think i can get if i put a 35r on with a 3" exhaust?

 

You answered the question yourself "Hmmm, it looks like its not even worth it to upgrade to the 35r" You have not even touched the limit of the gtx3076r yet.

 

The GTX 30r is a very capable turbo. But you need to really run higher boost to wake it up. It's the same with the 35r.

 

I love the new power except its kinda of scary. I have only done full throttle in 3rd gear a few times so far. I'm still to scared to do any lower gear. i think i need new tires haha