View Full Version : Msd Programmable Ignition
10-04-2003, 05:46 AM
It says on your site not to use the Rev limiting side of the 8979 with a 7AL-3 as it is too harsh a limit.If that's the case can i use the original 7AL-3 rev limiting (ie:leave the 8979 rev plug unplugged) and use the 8979 for ICM and retards?
That won't be a problem for me as i need the ICM and the retard curves only from the 8979 and i'd rather use the 7AL-3 as it was for the rev limiting.
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10-08-2003, 12:02 AM
Is the ICM that you are using stictly an ignition control module or does it have timing and rev limit functions built into it as well? If it is only controlling the ignition function, then yes, you can use the MSD 7AL-3 for the rev limiter functions and the 8979 as the timing control device.
10-08-2003, 02:02 AM
it has rev limit and timimg functions built in.So it says in the instructions anyway.
10-08-2003, 03:14 PM
10-10-2003, 03:06 PM
So are you saying i have got to use the rev limit functions on the 8979 digital controller then?
If so what am i going to do about the harsh limiter then?
10-10-2003, 04:33 PM
You can not use the limiter function of the 8979 with the 7AL-3. You will need to use the three-step limiter of the 7AL-3 (chips) and you can use the timing functions of the 8979. Make sure you put the zero chips in the 7AL-3.
10-11-2003, 11:33 AM
That's cleared it up.Thanx for the info.Glad you mentioned the retard chips as it's doesn't tell you that in the instructions.
10-13-2003, 12:06 PM
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