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dizzy stuff 

 

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 Post subject: dizzy stuff
Posted: Mon Oct 02, 2006 6:18 pm 
Getting Side Ways
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hokay ppl, I need someone to explain something for me.

I have an EL I6, which has a dizzy. (D'OH)

How is the advance/ retard controlled? I know the ECU has something to do with it, but does the ECU control the advance/retard, or is it done with weights (like the "old" style of dizzy)

Is it possible to recurve the dizzy without fiddling with the ECU, or installing an after-market ECU?
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Posted: Sat Oct 07, 2006 2:45 am 
Tyre Shredder
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it is 100% controlled by the ecu. the distributor generates a signal(pip) which goes to the ecu and the tfi module. the ecu uses this signal to determine engine position and based on it's own parameters the ecu will generate a spout or spark out signal back to the tfi module telling it exactly when to spark. does that make sense?

in answer to your last question, no u cant manually recurve the distributor without fiddling with the ecu. u can however advance the base timing the old fashioned way which will change the reference point right across the whole rev range.

hope that helps

 

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Posted: Sat Oct 07, 2006 2:49 am 
Getting Side Ways
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so you couldn't do like whats done with a shift kit and chuck some resistors and a switch to tell it to advance up a bit?

 

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Posted: Sat Oct 07, 2006 3:14 am 
Tyre Shredder
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u can advance the timing by turning the distributor.

remapping it would be a whole different kettle of fish. there are several factors which control the advance/retard table such as load, rpm, throttle position etc. there's also the knock sensor so advancing it any more than a few degrees is pointless anyway.

 

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Posted: Mon Oct 09, 2006 8:12 pm 
Getting Side Ways
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So TaraHymen, this means basically that the coil is fired by the ECU ?.

TFI =? I guess that the TFI is the grey thingy on the side of the distributor?

Now, back in the old days, when you timed a car, you advanced the dist. until it pinged, and then backed it off a tad. I guess, with all the anti knock stuff, this now cannot be done?

I have since taken a dist apart (courtesy of my local wrecker) and I see there is nothing inside except what seems to ba a Hall sensor and pickup. No springs, no nuthin'!

So, the TFI gets info from the ECU regarding throttle position, manifold pressure, rpm, sends a message to the coil, which then fires on cue.
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