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Cant get the timing down

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Old Apr 18, 2015 | 04:52 PM
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Default Cant get the timing down

I posted in the PCM section, but thought I'd try here to.

I'm using Hptuners to tune my mustang. 6.0 LQ9 twin turbo, 120lbs. injectors, e85. I cant get the timing to drop below 20 degrees at anything passed about 1200 rpm and .16 cylinder air mass. My main advance ( high and low octane ) and idle spark advance tables don't contain anything higher than 15 in them, at any point. When scanning, it reads a little higher timing below .16 airmass, then just flat lines at 20 above the .16 airmass. What else is commanding the timing that takes precedence over the main tables? All my correction tables are pretty much zeroed out.

Last edited by BOOSTAT4500; Apr 18, 2015 at 05:09 PM. Reason: wrong airmass number
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Old Apr 18, 2015 | 07:27 PM
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My 2001 Suburban 5.3 PCM adds timing under the Spark Correction AFR Correction table. It was adding 7 degrees of timing on top of my 27 degrees commanded.
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Old Apr 18, 2015 | 07:58 PM
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Originally Posted by BOOSTAT4500
I posted in the PCM section, but thought I'd try here to.

I'm using Hptuners to tune my mustang. 6.0 LQ9 twin turbo, 120lbs. injectors, e85. I cant get the timing to drop below 20 degrees at anything passed about 1200 rpm and .16 cylinder air mass. My main advance ( high and low octane ) and idle spark advance tables don't contain anything higher than 15 in them, at any point. When scanning, it reads a little higher timing below .16 airmass, then just flat lines at 20 above the .16 airmass. What else is commanding the timing that takes precedence over the main tables? All my correction tables are pretty much zeroed out.
go to spark>retard>min spark advance and make sure it is below 15 deg .
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Old Apr 18, 2015 | 11:19 PM
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Minimum advance was set at 20. Dropped it down to 10, and now works as it should. Thanks!!!
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