Dip in spark advance graph?

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Feb 8, 2006 | 06:28 PM

1999TransamWs6

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From: Ft Lauderdale, FL

Dip in spark advance graph?

Anyone ever notice the dip on the 3d main spark vs. airflow vs. RPM graph on HP tuners? Should this be hand smoothed out? What do you all think? it occurs around 3200- 4800 rpm

Feb 8, 2006 | 06:36 PM

bmfcamaro

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its in all of them. i forgot the reason but its supposed to be there.

Feb 8, 2006 | 06:37 PM

oange ss

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From: Texas

area of max torque = area of highest cylinder pressure = less timing

Feb 8, 2006 | 06:41 PM

1999TransamWs6

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From: Ft Lauderdale, FL

so basically just leave it be? If I raise timing raise it along with everything else correct?

Feb 8, 2006 | 06:57 PM

RedHardSupra

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From: Laurel, MD

i adjust the whole shape, but i try to ease up 2* at the peak torque areas. GM puts in a 'safety bump' in there, and probably for a good reason.

Feb 8, 2006 | 06:58 PM

oange ss

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From: Texas

you might get away with bumpin it up a little,but it may not help...you can reach a point with timing when adding doesnt help and too much will actually hurt, the only way to find out is on a dyno...... yes

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