Ignition timing
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Ignition timing
A lot of talk in the various threads concerning ECM's about the AFR and little about ignition timing. Can you gain power and/or torque altering the ignition timing in various degrees of modification? I have a 2008 CVO with SEAC and PC V and I wondered whether advancing the timing will have positive effects and what the dangers are of advancing it too much. Is fuel quality important in this respect? I can imagine that a poorer mixture will burn slower, does that mean the stock-timing is advanced enough, or does it not make a difference? What would be a good way to go about this (without help of a dyno)? Is there reserve in the stock-timing so you can alter it immediately and increase the performance, or is it not that simple?
Tourer
Joined: May 2007
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From:
on a twin cam, delphi efi system, there is little reason to mess with your timing. its already optimized for the engine. it has a built in knock sensor (ion sensing through the plug, wires and coil) to retard the timing in case of ping/knock. the only thing i have ever needed to change was in high compression built motors, retarding the timing at starter cranking speed to remove starter kick back.
My advice, leave 'er be.
My advice, leave 'er be.
Ultimate HDF Member
Joined: Nov 2005
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From: NE Ohio
on a twin cam, delphi efi system, there is little reason to mess with your timing. its already optimized for the engine. it has a built in knock sensor (ion sensing through the plug, wires and coil) to retard the timing in case of ping/knock. the only thing i have ever needed to change was in high compression built motors, retarding the timing at starter cranking speed to remove starter kick back.
My advice, leave 'er be.
My advice, leave 'er be.
To answer jmetro's question. The guys who concentrate on just the AFR are only getting a fraction of the tune. The timing has to be adjusted to get the most out of ones tune. The ones that just concentrate on AFR are leaving plenty on the table. Myself I want it to be all it can be and I want the crusing areas to be optimized to return good fuel mileage.
Road Captain
Joined: Feb 2007
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From: on the mud flats on the edge of slum city
Yes you have to adjust timing and give the bike what it wants.
I have seen some bikes take an extra 17 degrees advance and the power and rideability is very noticable.
I have seen some bikes take an extra 17 degrees advance and the power and rideability is very noticable.
I have not found a newer Harley yet that doesn't improve from advancing the timing. On average, I would say that 3 -5 is where I go, but like Scotty said, I have seen them like to be advanced farther. If a tuner doesn't work on the saprk advance tables, you aren't getting a full tune.
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Does anybody has an idea of what the spark advance actually brings in terms of power, torque, throttle response. Dyno results anyone? Is it actually advisable to have different timing for different gears?
There is no real set amount that it will bring. Some bikes like ti a little more advanced than others. I can typically tune a bike on the A/F, then mess with the timing and gain another 2 or 3 HP, sometimes more.
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