I have a 2.7 pulley and meth injection, about a month ago i use to see up to 19psi on the meth but latly i can't get more than 16psi on the meth and when the meth is off i only get 13-14psi. at redline! You can tell the car has lost power. I don't think its belt slip cause i do have the stage 2 belt, a non-slip pulley, and my boost doesnt fluxuat like if the belt was sliping. Does anybody have any idea what could cause this? Please help any imput will be appreciated!

 

maybe a leaking gasket? could be loosing boost through that

 

Did you check for leaks like intake or SC gasket??

 

No i havn't checked any of my gaskets because i would think it would idle funny but mine idles fine. Boost build up to 14psi like nothing but it just doesn't go anywhere after that. Ive noticed it getting worse and worse.

 

any exhaust mods? I lost a 2 psi from a hi flow CAT...

Could be that your rotors are messed up. Pull it off and take a look at em.

 

I do have an exhaust, 3" downpipe no cat and 3" side exit, but ive had that for awile and i use to see the 19psi with my current setup untill lately. Could the meth affect the rotors?

 

how long have you had meth for.

 

The meth maybe the problem, but take cyclo or carb clean and spray all the gaskets, if the idle raises then you know you have a leak.

 

yea, if you sucked in some dirt or something and scratched the bottom of your rotors blades you could easily be losing boost.

-Rich

 

Meth could deff hurt the rotots. But in the loooooooooooooooooooooooooooooong run

 

If you are spraying pre blower it could be eating the rotor coating. Could it be the bypass actuator diaphram?