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LT1-LT4 Modifications 1993-97 Gen II Small Block V8

spark advance question

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Old 08-24-2010, 02:45 PM
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Default spark advance question
how much spark advance should a stock LT1 be running at idle
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Old 08-24-2010, 03:00 PM
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if i remember correctly its about 20*
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Old 08-24-2010, 03:06 PM
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ok mine jumps from 15-18 is that a bad thing or could it mean that the ecm has been flashed with a tune
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Old 08-24-2010, 08:35 PM
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your probably about right for stock...

i forgot the cars idle about 650rpm, i have my idle set at 750rpm..

i didnt change my timing to much..
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Old 08-24-2010, 10:50 PM
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20* at 800 rpm IIRC. I doubt its been re-flased as the timing is going in the wrong direction, tune = more timing.
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Old 08-25-2010, 10:13 PM
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ok it idles at about 1000 cold and shifts somewhere from 6200-6500 WOT
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Old 08-26-2010, 12:20 AM
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at 1000rpm you should be seeing around 32* on a stock timing table if i'm reading it correct.

also stock idle is set at 650rpm in park/neutral

also the stock rev limiter is 5800rpm i believe.. i have mine set a 6000.
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Old 08-27-2010, 12:29 AM
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gonna hook the scanner up tomorrow and run it and see whats up if it changes when warm or no
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Old 08-27-2010, 12:44 AM
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Originally Posted by schultzy06
ok it idles at about 1000 cold and shifts somewhere from 6200-6500 WOT
Thats def not stock if its shifting at 6200 or higher its way into the redline... Stock it should Shift at 6000rpms, thats where mine shifts... but cold idle mines at 1000rpms too but when warm up drops to around 575-600rpms
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