i have 89 gtu....i also have a spare 13b from gtu.....i plan to turbo this car......my question is this.....i hear many say that the rotors in turbo 13b have different cr than na......what kind of boost can i run on non turbo rotors and will t II rotors fit inside the housings on a non turbo model???? if they will what all will i need to change along with rotors...i have a modest goal of approx 320 hp or so...in the vacinity anyways.....and how much boost will i need top make to run this setup??

 

i believe you can achieve the goal of 320 on NA rotors.. they do have a higher compression but 320 isnt an insane amount of HP...

you can fit TII rotors in NA housings, theres just a few things you should read before buying just any TII rotors... (i believe there are some restrictions but im not 100% on that).

try searching around - at this point every non turbo car has been turbo'd a million times over with a lot of documentation and advice

 

well i would prefer to keep my rotors and all intact.....i would do some work like portiung and such...but rotors are 3k old....and if i can boost safely i would like to......even with small boost.....maybe 8- is what my goal is on boost.....

 

Talking about the psi you want to run is meaningless, if you don't also say what turbo you intend to use. If you're talking about the stock turbo, 320rwhp will never happen.

What do you intend to use for tuning? It needs to be something with both fuel and timing control, or the higher CR will lead to a blown engine. Check the FAQ for lots of information on building 6-port turbos, which will be similar since you're talking about using the NA rotors. But you should know that most of the power gains come from the ports on such builds, an not from the increased CR. Using NA rotors and TII irons will give you hardly any more power & lots more risk.

 

If you have to ask, your over your head.