i have searched.. but not very long because i am overseas right now and i don't have that much time. .anyways to the question

i guess you could just say i am a little confused.. on the b-series motors you have a distributor to control your ignition timing right. .if it is mechanical.. how can you adjust the timing on an electronic timing map. .like on a standalone.. if someone could just explain that to me or give me a website or something. .i would appreciate it..

 

bumper...

 

The distributor just signals the base timing to the ECU. This signal doesn't advance & retard during operation, it's always the same. But the ECU doesn't just automatically fire the spark when it gets this signal from the distributor. The ECU then uses its map to adjust the spark timing based on rpm, load, etc...

 

not sure if your asking question about a problem, but if you are make sure the base timing is set on the stand alone, make sure the engine idel timing is the same for this

 

i just want to now how it works..
when you tune ignition.. just set the distibutor to zero/tdc/default. .whatever.. then just use the map.. do i have this right?

jim blake "The distributor just signals the base timing to the ECU" then why are you able to adjust the timing with the distributor.. they would have just made it a stationary distributor. but you can adjust it

 

The timing signals from the distributor is the only way the ECU 'knows' where the engine is in its cycle. If you advance or retard the distributor, the entire map will advance or retard along with it.

As the engine operates at different RPM or load, the signal from the distributor doesn't change. What DOES change, is when the ECU fires the spark before or after the trigger signal it receives from the distributor.

Older ignition systems fire the spark directly on the trigger signal. So the distributor would have mechanisms to advance & retard that signal. So there were spring-loaded weights (centrifugal advance) & vacuum advance diaphragms to do that. Now that stuff is all done with software while the signal stays constant.