Thread: Thinking of Going Turbo in your GP?

Originally Posted by SgtMarshal

none of the vendors suggest the 130lb springs. zzp either says 125 for the stattama stage 1 or 140/150 for the stage 4/5, and intense doesn't suggest any particular valve spring. sorry to annoy you with my questions.

for all intensive purposes a 125# spring is basically a 130# spring. i have the crow 125# springs shimmed to 130# seat pressure in my car with an ST5 cam and dont have any issues. i do think that i am getting a little valve float over 6000RPM as my power starts to fall off so heavier springs would be a benefit. but it doesnt mean that you cant run that setup. per your own requirements you said you didnt really want more then 375 at the wheels. 375 can easily be done with your XP cam and about 14-15psi (maybe less) for instance my car made 340 on the stock cam, springs, heads, on 13psi. shouldnt be to hard to pick up another 35HP with an xp cam. no it is not the most efficient setup. i dont think that you will be able to get the same power running significantly less boost with a specific turbo cam. given your power goals i would not switch cams. if you think you want more in the future and are willing to shell out big bucks on a trans in the future then by all means get an ST5. no reason not too.

i guess maybe i dont understand the question, you shouldnt be picking a cam based on the springs you already own if you are going for an all out setup. you have stated that you arent going for an all out setup, in that case your springs will be more then adequate to safely run any turbo cam on the market...

if i had it to do all over again...i would pick these things in priority order...
HOW MUCH POWER I WANTED?
HOW MUCH LAG I COULD LIVE WITH?
-those two questions will pick your turbo/cam for you
-match the springs to the cam
-match the timing chain to the springs/cam ramp rates


none of the stattama turbo cams idle poorly