LS1 Edit for Heads and large cam?
03-28-2002, 10:14 AM
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LS1 Edit for Heads and large cam? I was playing around with LS1 Edit last night on a car with Heads and a pretty large cam IMO (almost .600 lift)
I could get the car to idle better once it took hold of itself after start up. The problem is right at start up it falls on its
face and then blows a nice cloud of carbon (fuel) out then catches hold and runs. Ltrims last i looked were at + 25 for both
sides as it idled. Now that would indicate that it needs more fuel to bring them down to 0 ?
Info: stock 99 injectors
Heads, cam, and headers.
Maf is only missing the screen(still contains the dividers)
I could get the car to idle better once it took hold of itself after start up. The problem is right at start up it falls on its
face and then blows a nice cloud of carbon (fuel) out then catches hold and runs. Ltrims last i looked were at + 25 for both
sides as it idled. Now that would indicate that it needs more fuel to bring them down to 0 ?
Info: stock 99 injectors
Heads, cam, and headers.
Maf is only missing the screen(still contains the dividers)
03-28-2002, 11:20 AM
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Re: LS1 Edit for Heads and large cam? Sounds to me like either an exhaust leak or just reversion causing l-trim problems at idle. Are they at +25 always, or just at idle. If always you have a problem somewhere (exhaust leak, ported maf without a proper maf table, dead o2's, etc.) and you need to fix that.
If it's only at idle and you can't get rid of it there you can try setting the TPS to enable WOT to 0 percent for say 0-1600rpm. Then you can tune your A/F ratio at idle with the PE vs RPM table for that rpm range and you don't have to worry about O2 feedback (for just that rpm range)
If it's only at idle and you can't get rid of it there you can try setting the TPS to enable WOT to 0 percent for say 0-1600rpm. Then you can tune your A/F ratio at idle with the PE vs RPM table for that rpm range and you don't have to worry about O2 feedback (for just that rpm range)
03-29-2002, 08:30 AM
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Re: LS1 Edit for Heads and large cam? Hmmm, let me see what i can find out in the issues department <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
Because i could not get that first 1-2 seconds of start up to respond to any tuning...after that it works ok(for now...until i can get some runs in it, and log them)
Oh, the ltrims stay at +25 even a little after idle and it stinks of fuel is whats confuses me.
Thanks Chris !
Because i could not get that first 1-2 seconds of start up to respond to any tuning...after that it works ok(for now...until i can get some runs in it, and log them)
Oh, the ltrims stay at +25 even a little after idle and it stinks of fuel is whats confuses me.
Thanks Chris !
