Gmc Needs Help.
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Gmc Needs Help.
Ok I got a 2000 gmc 5.3 excb with the base sts kit, 43# injectors, nelson tune, Meth inj,high low boost controll,373.posi. This truck ran a 16.20 on my g-tec stock before my posi. Now at 5.7 lbs boost I can only hit a 15.60 at 91mph. Somthing has got to be wrong! Shoulden't it be alot faster than that?
I haven't tried the meth or the high boost since it's probaly not running it's best. What should my truck mph be shifting outta 2nd at, and what should the rpm be? Thanks in advance. Mike
I haven't tried the meth or the high boost since it's probaly not running it's best. What should my truck mph be shifting outta 2nd at, and what should the rpm be? Thanks in advance. Mike
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Originally Posted by luv4pits
Any help or should I post this somwhere else. Thanks
#5
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Something is definatly wrong. I ran 15.90's before the STS and 14.77 @5psi and this was before i put the injectors,ic, fuelpump and 02pcm. I hadn't made it back to the track but i should be in the low 14's. and this is a 2500HD. You need to put it on a dyno and get it tuned.
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Yeah or can Nelson help you with it. I ran 16.12 shifting manually at 5,700 and was right about at the end of the 1/4 at the top of 2nd. My friend hit 15.56 in his 00 rcsb,5.3,3.55 peg,FIPK Silvy in the other lane. Good luck!
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Originally Posted by luv4pits
Ok I got a 2000 gmc 5.3 excb with the base sts kit, 43# injectors, nelson tune, Meth inj,high low boost controll,373.posi. This truck ran a 16.20 on my g-tec stock before my posi. Now at 5.7 lbs boost I can only hit a 15.60 at 91mph. Somthing has got to be wrong! Shoulden't it be alot faster than that?
I haven't tried the meth or the high boost since it's probaly not running it's best. What should my truck mph be shifting outta 2nd at, and what should the rpm be? Thanks in advance. Mike
I haven't tried the meth or the high boost since it's probaly not running it's best. What should my truck mph be shifting outta 2nd at, and what should the rpm be? Thanks in advance. Mike