Independent cylinder knock control

[Edward Hernandez R]

"This is available now in the aftermarket from J&S. I use their box 
with Bosch sensor. It can retard each cylinder selectively and you
end up with separate timing curves for ea cylinder. Or it can retard
all the same."

Can you describe your ignition system? The two extremes I imagine are
1) single coil distributor system or 2) crank triggered coil per plug.
How does J&S box control each cylinder if it isn't option 2)?

Ed Hernandez
Ford Motor Company
ehernan3 at ed8719.pto.ford.com