First off here are all my mods: Its a 98 T/A. Stock Crank, 6.0 Liter Truck Rods, Mahle Stock CR forged pistons,Stock 98 Heads, TSP 232/234 .595/.598 112 LSA Cam, Comp Lifters, TSP +.100" pushrods, Stock Rockers, PRC Gold Valve Springs (good to .650 lift), LS6 Intake, Ported TB, SLP Smooth Bellow, MTI Lid, Pacesetter 1 3/4" LT's, TSP 3" OFY, Magnaflow 3" Catback w/ cutout before muffler, Vigilante 3600 converter, FLT Stage IV 4L60e, 3.23 gears, and 15 x 4 Telstars up front w/ metric radials, and 15 x 8 Telstars in rear with 275-50r-15 MT ET Street Radials in the rear.

Ok, i went and had the car dyno tuned by Allan Futral and Futral Motorsports, and the car would just not make any power ( 342 rwhp unlock converter, and 357 locked). Everything I have seen says my car should make 360-365 unlocked, and around 390 locked. Allan said he has no idea why it wont make power. One thing is was kinda worried about was that he tuned my car to a 14.1-14.2 AFR, and he said that his Wideband meter reads .6-.7 higher than most so my AFR is really 13.4-13.5 and thats where he likes to set his. I was still leary so i pluged in a buddy's computer with HP Tuners to check for Knock Retard, and there was none. I still think it is lean because i took it to an 1/8 mile track and it only ran a 8.14 @ 86 w/ a 1.85 60'. It was just a dog off the line. What do you all think. Im dumbfounded. Could being just lean with no knock retard rob 20-30 hp. Any suggestions or comments are welcome. Thanks

 

Have you compression tested it?

 

No i havent, when i get a chance i will and ill post my findings.

 

This is not for the advanced forum. Should be in the LS1/LS6 Internal Section.

 

I think 1 post is enough. exact thread in the dyno section...