Guys, an MSD is not a "computer" per se. It's basically a capacitive discharge system. All it really does is increase the power of a spark.
I do agree that the rev limiter function on the MSD (which is run off the distributor) goes beyond this and may be a (bit) problematic. But if anyone is getting their panties in a wad over the rev limiter on an MSD, they are barking up the wrong tree.
There are some long studies on the web about what an MSD will and won't do for you. Basically, the idea is that for FI systems that already have very precise fuel/air mixtures, the MSD doesn't do a lot. The extra spark isn't much help because a decent stock ignition with a good management system will make sure the juice gets all fried up nice.
But, where you start to see some advantage with teh MSD is on carb cars where the fuel air mixture is imprecise. MSD and its added spark here can really help.
I had a nasty miss in my TR8 when I first started running it. WOuld not pull cleanly to 6k. I changed a bunch of things at once (rebuilt the carbs, coil, and MSD), but I think the MSD helped cure the issue.
Of course, where the computers on EFI systems really help is in maximizing torque and hp UNDER the curve. Claims of 20 hp on the top end usually don't pan out, but look at what maximuming on a 100 rpm increment does for overall hp and torque. That's where the big gains are for the computer cars, and the MSD really hasnothing to do with that.
NC Region
1980 ITS Triumph TR8
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