Sudz

iTrader: (3)

Well kinda weird i previously trapped 117-118ish 11.90s-12.0s

Since then i added a fast 90mm intake/TB, intake previous was ls6 and stock tb, i took out the pacesetters and did qtp hvmc headers, i took out a qtp ypipe added a kooks, cause qtp was junk, ground clearance among other things. I added asp pulley, previous was stock, added poly motor mounts also.

well i go to the track in about the same DA/air quality and pop off a 12.17 @ 116 not to mention the 1/8mile speed was about 2-3mph lower

i know alot of you are going to say the tune, i agree, but i would have figured it run a little faster even with the tune it has. im thinking its running out of fuel up top, I still have the stock 26lb injectors, what do you think?
Add injectors, new tune ill hit 120mph?

GMTECH4

you are not the first. i read on here somewhere that a guy had the same problem until he got the car re-tuned then he picked up 40 more hp good luck!

Sudz

iTrader: (3)

i hope so , would be a bummer to put them mods on and run slower. It would Be nice if someone around here had hptuners or efilive to check it out.

ChocoTaco369

+1 on tune. i can pretty much guarantee your A/F is screwed up horribly. QTP's with HVMC's have been dyno-proven to add 8 peak hp on a mildly modified internals car.

sidewayz28

iTrader: (24)

yeah get it tuned... my tune is WAAAAYYYYYYYYYYYYYYYYYYYYYYYY off with the 90/90.

hitemup9nine

iTrader: (17)

i just went to the track last night and picked up two tenths with the fast 90/ptm 90 combo untuned also. went from 12.14 to 11.90 identical sixty foots. Hoping to get it tuned to see if I pick up anything else

Sudz

iTrader: (3)

I didnt pick up any time, i actually lost time and mph

Grimes

iTrader: (3)

Well think of simple stuff to try first, like air and fuel filter and plugs. Then get the tune checked out.

zmonsterjb

iTrader: (16)

ttt nice

BriancWS6

iTrader: (18)

Until you see how far the tunes off, I wouldnt worry yet.

orangeapeel

iTrader: (18)

I will just trade you for my port matched FAST 78/78.