How does ECU control the ignition?
05-06-2006, 08:01 PM
#12
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Join Date: Apr 2006
Posts: 2,057
Re: How does ECU control the ignition?
teach me then 
, 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?.. 
, 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?..
05-06-2006, 08:10 PM
#13
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Re: How does ECU control the ignition?
Originally Posted by Walter
teach me then , 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?..
, 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?.. 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.
05-06-2006, 08:39 PM
#16
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Re: How does ECU control the ignition?
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
05-06-2006, 09:02 PM
#17
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Re: How does ECU control the ignition?
Originally Posted by Walter
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
... but i think that you dont undestand to me so, leave it
05-06-2006, 11:40 PM
#19
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Join Date: Feb 2006
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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.
05-07-2006, 02:55 AM
#20
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Join Date: Feb 2003
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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.
