Barry Johnson

What I was trying to say was, with the ability for it to retard timing, would you be able to equally advance it? IE, electronic timing control.
I did read that late at night, so maybe I missed a concept or two in its setup...

Louie928

The EZ-K has maps that control the ignition timing. Most of the maps are based on the engine load and RPM. There are other maps too. You can set timing (advance/retard) using the Sharktuner by changing the value (+ or-) in the map cells. When the EZ-K senses that the timing is too far advanced for that particular cylinder by sensing a knock output of the knock sensor, it retards the timing a set amount (3 degrees). If knock persists, the EZ-K retards more up to a maximum of 9 degrees retard from the base map. With the Sharktuner you can change the amount of knock sensed timing retard of each step and also the length of time for timing to return to the normal base map value. You cannot set the EZ-K to advance timing from the base map value when it senses a knock. Does that answer your question?

Barry Johnson

Yes, it does. I had a major brain fart... I haven't driven a Porsche in a while, so its scrambling my whole world . I need a beer...

Lorenfb

"Without the ability to determine which cylinder may need knock retard, the EZ-K retards all cylinders by 6 degrees and uses no knock sense input at all. I'm pretty sure that how it works and why."

That's correct, based on the way Porsche/Bosch designed the EZK, i.e. with the use of a Hall
sensor. But the EZK could have just as easily "associated" and "remembered" when the knock
occurred in the eight ignition firings. Then the next time that cylinder needs to be fired, just
retard it only, i.e. count seven ignitions then retard.

heinrich

Louie, this is very exciting stuff and WORRYING results IMHO. I wonder what your result with an X and no rear muffler would be, I suspect BETTER.

Louie928

Ok. Got it.

Louie928

I doubt if it would make any difference. Other than sound, there doesn't seem to make much difference to the engine whether the rear muffler is on or off. I'm sure these injectors have never been out. I'm expecting a different result when I get them cleaned. I'll clean carbon from the intake at the same time. If I was a boostard, I'd really be worrying.

heinrich

I know that with the rear muffler on, I and others have clearly experienced pinging, where removing it removed the pinging.

Mike Simard

It sure would be nice to have indication of when EZK is retarding timing due to knock, either a blinking light on the dash or a data log. Is this possible?
BTW, it's nice to finally know what the purpose of the Hall sensor is, it's surprising that they had individual cylinder timing but didn't make the injectors sequential.

Louie928

Oh, ok. I've not noticed that, but would be something to check. I guess you could hear pinging better with it on. I didn't hear any pinging as the EZ-K was retarding timing so it was doing it's job properly. 'Course just because I didn't hear it doesn't mean it wasn't happening.

BrianG

There are stand-alone knock sensors that can utilize the stock knock sensors. This would tell you that knock is beaing heard, but not that the EZK was responding. Watching the stand-alone unit indications while the car was hooked to the Shark Tuner would reveal the concurrence of the two events.

heinrich

You mean a RETARD warning light?

Mike Simard

Yes, a big red light that say's RETARD and flashes occasionally, probably mostly when you're on a date.

SharkSkin

It would lose track of this as soon as you turn off the ignition though, wouldn't it? Maybe the sensor was used so that it can use the established map at startup instead of having to figure it out from scratch?

SharkSkin

Yeah, or when you put crappy Arco 87 octane in the tank, the light blinks on the dash: RETARD