View Full Version : EZK timing retard mod
03-24-2004, 02:32 AM
Ok heres what I have learned soo far. I spent all night learning the pinouts of my EZK box on my 88 745tic and learned them all.
The plain yellow wire is the one that comes from the LH box to the EZK box and tells it to retard or advance the timing. Heres the hard part changing the signal to do what you want. In my case i need more retard under full boost. I have found that cutting the wire knocks off alot of timing and causes the car to run very very slugisly. I am going to experiment with some pressure switches and or map sensors to change the signal to my liking.
If you have any tips or ideas let me know. This would be very usefull to us running higher boost levels.
03-26-2004, 04:01 AM
you need to play around with that a little more, I had a bit of a brain storming session with dangto, and a map sensor tied to a microprocessor to feed it voltages based on engine load (a sort of btm). The nifty thing about something to that effect would be except for the really high boost situations with a fairly nasty turbo, one really ought not be dipping much below the base idle timing.
obvious uses of something like this would be fuel control by megasquirt, with retention of stock ignition (perhaps switching between ms n lh would be that much easier). we'd hafta set something like that up on a dyno where things could be experimented with and timing observed at the same time.
Neat hack? what? ideas thoughts comments?
03-29-2004, 02:56 PM
well , we have the same system on the 480 here , if you disable the load on the unit it retards 10 degrees from the base map , which as you say makes it run like crap .
fortunately i think you can alter the base timing on your system where as i cannot . the pressure sensor is inside the unit , and i dont think you can pull them apart . The EZk will retard if it heres knock and advance it again until it heres knock again . it will automatically tel the fuel ecu to dial back injector duty if if excess boost is reached and if rpm is getting towards 6242 rpm .
i dont think you can get it to retard more than the base timing which is a shame , although you could fool it with a load signal . ie make it see more boost than you actually have , so it will retard accordingly .
What i plan to do , is have the engine idling and with a vac pump , apply pressure to see where the timing goes . The engine needs to be above 2200 rpm for this to happen . let me know how you get on .
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