Re: How safe is above normal boost?

[Glen Powell/SMC <Glen.Powell@smc.com>]

That ur-q "timing band" of ~+-2% is the window in which the distributor's 
pulses will sync up with the flywheel timing pulses. The actual firing of the 
coil/plugs is controlled by the CPU based on various sensor inputs and the PROM 
map. Ned alters some discreet component values to alter the ignition advance 
curve to make it more agressive and also to reduce the rate of retard as a 
function of boost. This is all done inside the CPU and does not rely on the 
physical position of the distributor relative to the crank in any way. The 
"special" service manuals for the ur-q go into some pretty good detail on the 
actual timing maps as a function of various sensor inputs, etc.

-bob