how does comp control spark timing on distibutor
 

i was just curious, how does uberdata and other engine management setups change timing on distributor cars. I have done my own search and cant find it anywhere.

Re: how does comp control spark timing on distibutor
 

The ECU tells the ignitor & coil when to do their thing. The distributor is just a mechanical means of directing the spark to the correct cylinder. Ever notice that the rotor has a rather long edge on it, this is to account for the various positions it will be in (in relation to the 4 points in the cap) as the ECU varies the timing.
Also, the reason why rotating your distributor changes your timing is because the sensor pickups for the ECU are located inside it.

Re: how does comp control spark timing on distibutor
 

ok, i understand now thanks