Knock Sensor: At what voltage will the ECU pull timing?
Dec 28, 2005, 11:21 AM
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Knock Sensor: At what voltage will the ECU pull timing?
Does any one know at what voltage will the stock ECU start retarding timing? Is it progressive?
Thanks in advance.
Thanks in advance.
Dec 28, 2005, 04:00 PM
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Since it's a DSM. It has a single wire.
Knock sensors reads frequency. It then sends it to the ECU and converts it to voltage.
Not sure what frequency it starts to take timing out.
.
Knock sensors reads frequency. It then sends it to the ECU and converts it to voltage.
Not sure what frequency it starts to take timing out.
.
Dec 28, 2005, 05:38 PM
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Originally Posted by jj_008
Does any one know at what voltage will the stock ECU start retarding timing? Is it progressive?
Thanks in advance.
Thanks in advance.
i'd also be interested in knowing the factory ecu's knock threshold
Dec 28, 2005, 06:14 PM
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Originally Posted by Nad1370
Since it's a DSM. It has a single wire.
Knock sensors reads frequency. It then sends it to the ECU and converts it to voltage.
Not sure what frequency it starts to take timing out.
.
Knock sensors reads frequency. It then sends it to the ECU and converts it to voltage.
Not sure what frequency it starts to take timing out.
.
Dec 29, 2005, 08:31 AM
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All these tuners out there and no one knows? What are all the aftermarket turbo guys, that use the stock ECU, doing about the increased noise generated from these kits?
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Dec 31, 2005, 05:51 AM
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Originally Posted by 94AWDcoupe
I just read a post somewhere on this subject. Someone was reporting stock ecu was at 2.0 with no timing pull. Timing pulled at 2.2.
Dec 31, 2005, 06:24 AM
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Originally Posted by jj_008
This would make sense to me.
Dec 31, 2005, 06:29 AM
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Originally Posted by MM Racing
Please explain how the hell that makes sense to you since the previous post was about as vague as Area 51. The other guy was correct that the knock sensor reads frequency, you need an ocsilloscope to be able to accurately view what the knock sensor is doing. AS far as I know none of the dataloggers out there will show you knock as a direct voltage.
Dec 31, 2005, 07:59 AM
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From my understanding the Stock ECU is always changing its allowable noise limits so it can detect true knock values. Do a search in the Vishnu forum, Shiv did explain this logic very well at one time a while back. I would think the thread is still out there somewhere. I would try to explain it but I don't remember some of the specifics, don't want to post some mis info.
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