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KLR

KLR = Knock Sensor?

If so, I think it can (what's the point of the knock sensor otherwise?) but am not 100%.

And it may vary from model to model. Which model are you talking about?


Oli.
 
The KLR is a separate Brain that is used to control boost and knock prevention on the 944 turbo (maybe others?). The dme sends a signal to the KLR to indicate that it wants to spark. If there are no signs of knock the KLR will send a signal back to the DME which will operate the circuit that causes the coil to discharge and generate the spark. If the KLR has detected knock then it will hold that signal back effectively retarding the ignition by 6 degrees or so. I was wondering if the DME detects that the ignition has been retarded and takes any action of its own or if it is completely unaware. The circuitry for this is quite complex and I can't tell if the signal coming back from the KLR is fed into the microprocessor in the DME or just acts on the ignition circuit directly.
 
Ah. Thanks for the explanation.

I drive an S2. I didn't understand a word of what you wrote, but it sounded very clever. [:)]


Oli.

(Or, more seriously, thanks. I've never heard of such a system, and it sounds remarkably sophisticated for an '80's bit of tech. I'm impressed. Sorry I can't help with answering your question.)
 
Really?

Well I never knew that!

One as a back-up? Double redundant design? Or just for added forum boast value? [:D] (Not that us S2 owners need it, natch!)


Oli.
 
I don't believe the KLR doesn't retard ignition, the DME does. The KLR will pass the signal to the DME to instruct it to retard ignition. All the ignition and fuelling is controlled by the DME.

You don't really need 2 knock sensors - just extra weight!
 
Its a wierd setup, I got the info on how it works from some old posts on rennlist. The circuit diagrams certainly seem to corrolate with this method of operation. I would have expected that the KLR would just send a knock detected signal to the DME and then the DME can retard ignition.

KLR_pinout.jpg
 

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