Anyone know how much boost you can throw at the 4G63T? I have a 97 GSX running 15p.s.i. I know it can handle alot on stock internals but I am paranoid about boosting too high now because I had a 98' 3000GT VR-4 with a JDM engine(hense the name) and I ran 15 p.s.i and the damn thing seized!!! I know the 4G63 is way stronger with its cast iron compared to the aluminum block of the 6G72TT

 

Not sure on the Eclipse (specially the 7 bolt) but there are EVOs running 27ish PSI on the stock internals and only needing to add CAMs. EVOs bottom end is good till around 500+WHP

 

keep in mind turbo upgrade feul exhaust and other mods play a big part as I am sure you already understand that
The T25 I would boost higher than 17PSI I did se someone running 19 but the turbo I am sure wont last to long at that level

 

i run 22psi with 660 injectors on stock internals. Race gas i could probly up it to 25ish. As long as your giving the motor enouigh fuel its probably safe to almost 30ish

 

wow I just got some 660cc injectors and A T66 turbo(picked it up about an hour ago)so i'm going to put these on my GSX and crank the boost up to 25p.s.i. Then its time to hunt down some STi's Thanks

 

you have an safc for the 660's? if you crank the boost up to 25 dont come back asking why your motor blew up. i said 25psi with race gas, adn that was properly tuned too. 660's are going to give you mega timing advance and if you dont know what you are doing you are going to have some serious problems

 

Dont worry I am going to get my dad to help me and he is a technician so he wont let me do anything stupid.