Spark issue "off the line"
11-17-2009, 05:57 PM
#1
Spark issue "off the line"
Made a few logs at the track and noticed a spark issue that i may need some help with. First the stall is a 3600-3800 circle D. Stalling about 1500rpm staged up timing is ~40* then when taking off the spark goes down to 14.5* then back up to 26.5* at around 4100rpm and remains wt commanded for the rest of the run. I commanded the specified cells in my spark table to 35* and now get somewhere around 21*. Don't know why its dropping for this short amount of time but i need to correct it. Any ideas of wt can be checked?
More than likely that is your answer. Also, confirm you are using the HI octane timing table...
11-19-2009, 10:20 PM
#7
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Mine does the exact same thing. It is actually a good thing for me as it spins a lot. It is my built-in traction control, lol. Someone here asked about pulling timing for launch control well here it is.
Attached are some logs of some runs I made at the track.
The first one I was peddling it because I lost traction off the line. You can see that every time I stab the peddle the spark goes way down sometimes negative. It is almost a mirror opposite of the throttle.
The second and third runs you can see I tried launching at 50% throttle to get traction.
I also need to get a IAT relocation adapter because my IAT's are always really high do to heat soak and that pulls timing also.
Attached are some logs of some runs I made at the track.
The first one I was peddling it because I lost traction off the line. You can see that every time I stab the peddle the spark goes way down sometimes negative. It is almost a mirror opposite of the throttle.
The second and third runs you can see I tried launching at 50% throttle to get traction.
I also need to get a IAT relocation adapter because my IAT's are always really high do to heat soak and that pulls timing also.
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11-20-2009, 07:50 PM
#8
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A customer at a friends shop, 08 Silverado Ex Cab 4x4, built 5.7L w/turbo. They had a problem with it pulling timing, turned out to be a knock sensor.
11-21-2009, 12:42 AM
#9
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Feel free to post up a tune file
11-21-2009, 07:30 AM
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This sounds very much like Burst Knock and an easy problem to fix. It can be tuned out though so I would highly suggest that you dont just go and zero out the burst knock table because that is kind of a lazy "half ***" way of taking care of it IMO and because burst knock does serve it's purpose in the tune.
Last edited by KLUG'S SS; 11-21-2009 at 07:48 AM.