My LS i bought off a buddy of mines got about 8 degrees advanced timing. Short ram intake, custom cat back 2" piping, and a univeral Apexi Dunk muffler. Ecu's been tuned to dump more fuel for the extra air and flow.

My question is, what does the advanced timing do? I raced my friends stock LS and I lost (got 17" lensos on there too).... by a lot. I'm thinking that the timings suspect, or the rims. Logically, I'd think that the advanced timing is better for low end torque, but bad for high revs. Should I change the timing?

thanks a lot!!

 

You have an OBD-2 ECU which can detect advanced timing and compensate. So if you've been driving around with the car like that for a while, your ECU has probably already figured out what's going on.

However I believe the reprogrammed ECU is probably the culprit. The stock ECU is perfectly capable of reading the amount of air going into the motor, so if you have an intake or something it is aware of the change and makes the necessary adjustments to still maintain the set factory a/f ratio.

Except I just realized...your car is OBD-2. So I don't think anything has been done to the ECU since nobody sells OBD-2 chips.

Either that, or your car is just slow.

 

what mike said, or your friend is just a better driver than you..

do you have the 17s, or does he?

 

Is your car an auto and his a manual?

ECU "tuned" to dump more fuel doesn't make sense. For the few mods you have on there the factory ECU should be able to compensate. Purposely dumping more fuel than necessary will make you slower.

*edit* Advancing the timing on an OBD2 does nothing.

Shingo

 

The fact that the car is OBD2 leads me to believe that the prior owner was full of sh*t.

 

:werd:

 

Ok so advancing on obd2 does nothing, what about retarding? Is it the same deal?

 

Same deal.

 

Even if you jump the service connector? I was told it would work if it was jumped.....

 

theres always the chance that you got a slower car than usual.....occasionally cars come out of the factory a half second of so slower then the norm is rated. Just a thought.