hey dave, me and mike are stumped with my msd 6al..... iv been running it for about 5 months now but never had the limit chip in there as i was running in the motor....

tonight we tried some of the rev chips to see if it limited it and thats when we struck with an issue, im still waiting for my tacho to come from the us of a so i dont know the exact revs its pulling but with a 3000rpm chip it feels like its limiting it at about 5200 or so.... either way its revving waaayyyy past the 3000rpm its supposed to limit at....

tried a bunch of limit chips and checked that they all work with a multimeter.... also the msd is putting out about 7.54v out of the chip plug so it working too....

im totally stumped and we have no idea why its doing what its doing.... have you had this problem or ever heard of it??? any info would be greatly appreciated.....

thanks adam

I know I'm not Dave, but have you cut the appropriate wires on the side of the 6al behind the round black plastic cover to let the MSD know it's working for a 4 cylinder engine? - H

http://www.msdignition.com/uploadedFiles/MSDIgnitioncom/Products/Ignitions/64...

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Henry and Marko have your answers Adam.
Change the name of your topic so other people can use the infrmation
in future when they search for MSD problems.

hahaha thanks Henry! i forgot that you trawl these pages aswel how is the new car going? it was really impressive on its first time out, and ridiculously consistent for a brand new car... great work. any more test and tunes before warwick?

thanks marco, that helps heaps, i never got an instruction manual with my 6al, i bought it used off the net hopefully this will work, going straight to the workshop to try it right now!!

thanks guys, it solved the problem and now works brilliantly..... cant believe it was that simple..... how is it that the car itself ran fine the whole time and the only thing affected was the limiter?

Adam, the reason the MSD works without a chip is that it fires the coil every time it gets a signal from its trigger.(at this point it doesn't count the number of pulses)
When you install a chip and without cutting wires, it assumes it is a V8 therefore it counts 4 pulses per revolution. As a 4 cylinder has only 2 pulses per RPM your RPM was double
Also without a chip, there is no RPM limit
By cutting the wires, you are letting the MSD know how many cylinders are firing for each crankshaft revolution

As for the yellow car, thanks for the favourable comments. Took a while to figure out what I wanted as a combination and it isn't quite there yet. One more T/T is available at WSID on the 5th Sept. before Warwick to which I have already entered. Just need "Bum in Seat" time