Ignition timing for tuning
Thread Starter
Instructor
Joined: Mar 2006
Posts: 174
Likes: 1
From: Bettendor Iowa
Ignition timing for tuning
Guys...just a quick question here regarding ignition timing:
All things remaining the same (including timing advance curve) would advancing or retarding the base timing change/improve acceleration from a stop? In other words, would advancing the timing make acceleration a bit more responsive?
Thanks for any and all input.
All things remaining the same (including timing advance curve) would advancing or retarding the base timing change/improve acceleration from a stop? In other words, would advancing the timing make acceleration a bit more responsive?
Thanks for any and all input.
Safety Car
Joined: Sep 2003
Posts: 3,599
Likes: 24
From: Orange County NY
St. Jude Donor '10-'11-'12-'13
There is a lot to that question, but in general - yes, advancing the timing by 1, 2, even 3 degrees can give you a little more responsiveness. Gotta watch the top end, though. Too much advance under heavier loads can result in detonation. You can get away with more timing under lighter loads and cooler temps.
Le Mans Master
Joined: Oct 2003
Posts: 6,130
Likes: 2
From: seattle WA
with byebye, but your profile says to many mods to list. If that's the case you might consider sending your data (all mods) to a tuner (unless you've already had a custom chip). They should be able to zero in on the best timing for your application. My 87 is stock, and the base timing for it was 6*, but I've advanced it to 8* which does give it a little more snap on acceleration.
Melting Slicks
Joined: Apr 2002
Posts: 2,118
Likes: 0
From: St. Charles, MO Route 66 Corvette Club
Jansen:
The advancement of the timing may give you more acceleration from a dead stop. However, as soon as the engine becomes loaded, the advanced timing may create ignition knocks. Ignition knocks causes the ECM to retard the timing. Gains???? You may want to advance the TPS to about .6 volts at idle and see what this does for the off line acceleration. The TPS advancement like the timing has a negative impact at the high end and your fuel miles per gallon may be reduced.
The advancement of the timing may give you more acceleration from a dead stop. However, as soon as the engine becomes loaded, the advanced timing may create ignition knocks. Ignition knocks causes the ECM to retard the timing. Gains???? You may want to advance the TPS to about .6 volts at idle and see what this does for the off line acceleration. The TPS advancement like the timing has a negative impact at the high end and your fuel miles per gallon may be reduced.
