This is the blurb on the MSD-6AL box.I'm trying to understand the "Two Step Rev Control".The 2nd step is a rev limiter and the 1st step is a 'Holeshot rpm'.What's that?
"MSD 6AL, PN 6420 The 6AL shares the same proven circuitry of the 6A with the addition of a built-in adjustable rev limiter. The combination of powerful sparks with the safety of a Soft Touch Rev Control is what makes the 6AL the most popular ignition control in the world. MSD first developed the Soft Touch rev control to prevent overrev damage to your motor in the event of a missed shift or driveline failure. The rpm limit is adjustable in 100 rpm increments with MSD’s plug-in modules. When the engine reaches your selected limit, the Soft Touch circuitry begins dropping the spark to various cylinders. On the next cycle, these plugs are fired again to prevent fuel from loading up in the cylinder. The result is a smooth and accurate limiting action without backfires or roughness. The Soft Touch Rev Control also opens the door for you to add rpm accessories such as a Two Step Rev Control. A Two Step allows you to set two rpm limits, one for a holeshot rpm and another for overrev protection. The 6AL is supplied with rubber shock mounts and modules for 3,000, 6,000, 7,000 and 8,000 rpm."
And this is taken from another MSD install thread:
"MSD is quite a company that far surpases their competition in the world of ignition systems. Proof of this can be seen in the MSD 6AL that you just installed. MSD offeres RPM Plug Kits for those wanting a bit more tuneability for their setup. I'd recomend, on a 3G, starting with the 6000 RPM plug once you hit the dyno for a tune session just so you can see where your power curve is. Once you find this out, lower/raise your RPM plug to that RPM and try again. Keep in mind that it's still not the best idea in the world to go over Redline on the Tachometer, but that's what these plugs are for. MSD offers a good wide range of these selector modules ranging anywhere from 3000 on up to and probably past 9000 RPM plugs in 100 RPM incrumentsm. These kits can be found online with Summit and other MSD suppliers."
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