Re: How does ECU control the ignition?
 

Not really.

Re: How does ECU control the ignition?
 

teach me then ;D , so, there are two way for to advance or retard timing? one way is to move the distributor, (right or left) , and the other way is about to do it through ECU?.. :6

Re: How does ECU control the ignition?
 

Yes. Moving your distributor will change your timing a set amount (a degree or a few degrees depending on how much you move it) and that translation will be applied for ALL rpm values.

Most people who change timing through the ecu, are changing specific values associated to RPM/Map value. Instead of retarding your timing by 5 degrees across your WHOLE map by moving your distributor, you can retard/advance the timing the exact amount you want in the exact place when you change the ignition map on the ecu.

Re: How does ECU control the ignition?
 

ok i understand.. :D can i do other question about ignition? :-[ , it's about ignition map. :-[

Re: How does ECU control the ignition?
 

I guess

Re: How does ECU control the ignition?
 

:D ok , i dont understand about timing belt for example in uberdata, the ignition map, ok, those values are the degrees, right? ok, in BTDC ? that i dont understad.. i know what its BTDC (when piston is botton..).. i can imagine myself that, who it's work.. :-[

thank you for your patience :-[

Re: How does ECU control the ignition?
 

What is your question? What about the timing belt? BTDC=before top dead center.

Re: How does ECU control the ignition?
 

mm i dont understand the values mean of ignition in BTDC... :l ... but i think that you dont undestand to me so, leave it ;D

Re: How does ECU control the ignition?
 

The values are degrees of advanced igniting before top dead center. You can also set values of timing based on boost (the top row in most editors). The more boost, the less advancement of timing you will have (retarding the ignition). The values themselves may not tell someone a whole lot just by themselves, but relative to the other values in the map you can at least see the pattern.

Re: How does ECU control the ignition?
 

Sad thing is, I think I'm the only one in this thread who understands how the ECU uses each individual distributor sensor, how exactly the ignitor is fired by the ECU, and the exact nature of the tach signal. Well, one of the Chris's might. Not that it matters... because... it's all written in a Helms manual, anyway. There's something to be said for reading the factory service literature a time or two.

:-\