Not getting full timing at WOT; any suggestions?
07-30-2006, 09:14 PM
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Not getting full timing at WOT; any suggestions? Diagnostic was done on the street.
Replaced the MAP sensor with a new one since the stock one went bad.
My timing went up from the 22* on the bad MAP sensor to the following on the new MAP sensor:
25.5-26* in 1st; 26-26.5* in 2nd; 26.5-27* in 3rd; only went to 5400 rpm's in 4th with 27*. Shifting at ~67xx rpm's.
No KR. Lterms 0. TPS 99.6%. FTC 22.
Timing averages ~26* through 3 gears. I have timing set at 30* in the all-motor tune and I am confused with the timing I'm seeing at WOT
EDIT: does the double-quench of the LS6 style heads affect WOT timing? I never really had an issue on the ported LS1 style heads.
Any input welcome
Replaced the MAP sensor with a new one since the stock one went bad.
My timing went up from the 22* on the bad MAP sensor to the following on the new MAP sensor:
25.5-26* in 1st; 26-26.5* in 2nd; 26.5-27* in 3rd; only went to 5400 rpm's in 4th with 27*. Shifting at ~67xx rpm's.
No KR. Lterms 0. TPS 99.6%. FTC 22.
Timing averages ~26* through 3 gears. I have timing set at 30* in the all-motor tune and I am confused with the timing I'm seeing at WOT
EDIT: does the double-quench of the LS6 style heads affect WOT timing? I never really had an issue on the ported LS1 style heads.
Any input welcome
Last edited by The Dragon; 07-30-2006 at 09:37 PM.
07-31-2006, 03:48 AM
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I thought of the Low Octane Table too but I never had to change this table on my Stage II ported LS1 style heads I had changed the Low Octane Table before I posted the thread and planned on retapping tomorrow night to see if that was the problem.
I didn't run into this timing dilemma, with my Low Octane Table stock, until I added the LS6 ported heads.
I'll see what happens with the Low Octane Table and then I'll mess with the IAT Table if that doesn't fix it
Thanks!
I had changed the Low Octane Table before I posted the thread and planned on retapping tomorrow night to see if that was the problem.I didn't run into this timing dilemma, with my Low Octane Table stock, until I added the LS6 ported heads.
I'll see what happens with the Low Octane Table and then I'll mess with the IAT Table if that doesn't fix it
Thanks!
07-31-2006, 07:19 AM
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I ran into this a little while back as well, but I don't think it was a full 7*. When I lessened the discrepancy between the high and low octane tables, the problem actually disappeared. I set the low octane table with 5* less than the high octane at 4k+ RPM and we saw full timing. Not sure why, but maybe it reset the knock learn when we changed that variable or something.
Also, read this thread for more insight:
https://ls1tech.com/forums/pcm-diagnostics-tuning/478930-odd-timing-issues-not-getting-full-advance.html
Also, read this thread for more insight:
https://ls1tech.com/forums/pcm-diagnostics-tuning/478930-odd-timing-issues-not-getting-full-advance.html
