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 High RPM timing retard 
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Joined: Sat Mar 16, 2013 7:58 am
Posts: 35
Does anybody run a timing retard? RPM or shift activated. I just put a new 7al-3 (black box) on my dragster. I have it set up to pull 4 degrees out at 8000 rpm. The only reason I hocked it up is because the box has the feature in it and I want to see if it makes a difference. I shift at 8200 and trap a little over 8500 rpm. Too busy this weekend to race,but should be out next Sunday if it does not rain. Bob J


Sat May 04, 2013 6:14 am
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Joined: Fri Feb 08, 2013 5:50 pm
Posts: 1026
I looked at the power at various RPM's on my dyno sheet, and for the most part it made best torque to HP at one timing setting. There might be small gains with individual cylinder timing, but too involved to worry about it on a bracket engine. I do run a couple more degrees at lower RPM's/loads to make sure the plugs stay clean, pull it out at 4000 RPM.


Sat May 04, 2013 8:32 am
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Joined: Sat Mar 16, 2013 7:58 am
Posts: 35
Ok, maybe I will try pulling some timing out at a lower rpm. Right now I am running 32 degrees. Bob J


Sat May 04, 2013 11:29 am
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Joined: Mon Feb 18, 2013 5:11 pm
Posts: 17
The advantage of the newer ignitions is you can easily write timing programs. More timing on the two step and through low gear will help you accelerate then you can pull it out before your RPM (and load) gets too high. From there you'll typically want less timing as you shift gears, but most engines will actually want more timing past peak torque.

You can pick up a little performance, but when you're just going to dial in running on the ragged edge really isn't needed




Mon May 06, 2013 2:35 pm
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