February 18, 2021

J&S VelveTouch Rev Limiter

[@jselectronics8215]

I forgot to say the program for six cylinder is different. For 4, 5, and 8 cylinder, the program fires two, skips one, fires two, skips one, etc. But that would foul the same two plugs on a six cylinder. In six cylinder mode, the program fires three, skips two, etc. This rotates the misfiring cylinders, preventing plug fouling.

[@jimski1]

If this is connected to an HEI , how does it individualy know where each cylinder is?

[@jselectronics8215]

If it hears a knock, it knows it had to be the cylinder that just fired, and that THAT cylinder won’t fire again for two more revolutions. When the knocking cylinder is about to fire again, software dials in the calculated amount of knock retard for THAT cylinder. Refer to this diagram from the “Tech” page on jandssafeguard.com www.jandssafeguard.com/images/KnockWindow.jpg