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Old 01-26-2007, 06:03 PM
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Default High Speed Retard

I would like to begin utilizing or trying some high speed retard on a 15 to 1 alcohol drag engines. One is a super pro dragster running a digital 7 and we are assembling a 6.0 heads up camaro utilizing an 8981.

My question is not how to retard the timing at high speed with either system, but could someone recommend an RPM where retard would become useful.

For example, we run fixed 34 degrees on the dragster, but I am thinking about trying 36 degrees up to say 5500 RPM and retard it 3 degrees at that point up to 7200.

Or maybe it's 34 degrees up to 6500 and retard it 2 degrees up to 7200.

Could someone make a recommendation for alcohol set ups?
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Old 01-29-2007, 09:50 AM
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Which Digital 7 are you using? If you have the Programmable Digital units (i.e. 7530T, 7531, 7535, 75301) you can set up the high speed retard in the programming. The Digital 7 Plus 7520 has a single stage retard built in that you can activate for this. As to what RPM to retard the timing...well, that is something you will need to experiment with.

If you have the 7520 and are already using the retard, you may add another retard unit to that box.
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Old 01-31-2007, 07:06 AM
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It's a 7530 and I understand how to reprogram, but I was hoping for a starting point.

I guess we will just do some Test & Tune, trial and error.

Thanks for the reply.
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Old 01-31-2007, 09:19 AM
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That is unfortunately how the retard value is going to set. I have had applications that have retarded from 12 degrees up top all the way down to 2 degrees. So start low and work your way up and watch the MPH. That is an indicator of if the engine liked the change or not.


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