jwallz23

hey guys im still new at this forum thing so maybe someone can direct me. I have a vortech v1 in my 2003 gt, theres a code on for the fuel rail pressure sensor but my fuel pressure is fine(have an external gauge. my vortech also isn't making full boost which is 8-10 lbs before and now barely goes over 5, cant find any vacuum leaks either. if im not posting in the right place just let me know. thanks

moncherou

hard to trouble shoot that one, are you sure you trust the pressure guage?

97stanger

belt slip? Whats your setup?

jwallz23

I have a low mile 03 cobra shortblock, stock gt heads n cams, hps lower intake, accufab upper plenum and 75mm tb, vortech v1 with 3.6 in pulley, 42lb injectors, svt fuel pump with KB BAP, full exhaust, drag springs, Lakewood shocks n struts, subframe connectors, driveshaft loop...I think that's it...it's for sale once I get everything back to normal. Got it all done last year an I was runnin 8lbs, changed the gauge n ran the same. Now boost barely gets to 5lbs. I kno I Gtta replace my fuel rail pressure sensor today but I don't think that's my issue as fat as boost goes. Belt slip sounds very likely, I replaced the belt and tensioner last year but I put 20k miles on it since then.

uberstang1

s trim or t trim?

jwallz23

S-trim

uberstang1

3.6 Seems like an awfully big pulley for a s trim, I would guess it would make around 6 pounds with it.

jwallz23

yup uberstang1 youre right, I went out n measured it to make sure and I goofed, its a 3.33. I was consistently makin 8-10 lbs before...higher during the winter of course

Dragonus18

If you have long tubes that would affect it as well.

sv650lex

Pull your intake tube and check out your impeller. Make sure there is no play in the bearing and the impeller hasn't started rubbing on the volute.