DIYPNP and knock sensing
07-04-2017, 03:57 PM
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DIYPNP and knock sensing
So I am getting my DIYPNP tuned later this week and want to have a working knock sensor for when I do so. I bought the bosche 944 knock sensor people recommend, which should get wired to my DIYPNP's ADC1, correct?
When I went to look at adding it, I noticed my car already has a knocksense installed (which explains the mystery box in my glovebox....) and wired properly with an LED. As I understand, this is not meant to work with my DIYPNP since my ecu has a inboard knock sensing circuit (although it has a timing output to be sent to be sent to an MS, perhaps the DIYPNP's inboard knocksensing circuit could be bypassed?)
So now I have two knock sensors and two knock sensing circuits and I'm wondering what I should do. As far as I see it there are 4 options:
1. Leave the knocksense installed, don't add a knock sensor to the DIYPNP (then I don't get any timing pull when knock is detected)
2. Remove knocksense, add knock sensor to DIYPNP (then I don't have a warning LED for when knock occurs)
3. Install both, leave knocksense independent and then give the DIYPNP its own knock sensor (downside being I have more complexity)
4. Splice wire coming out of knocksense's sensor, and run it to the DIYPNP's ADC1 as well as the knocksense circuit. Then I get both the LED and the timing pull, and leave the currently working system alone
I'd prefer to do option 4 if it would work, but am left wondering if splicing the knock sensors wire would weaken the signal. Any thoughts or input?
When I went to look at adding it, I noticed my car already has a knocksense installed (which explains the mystery box in my glovebox....) and wired properly with an LED. As I understand, this is not meant to work with my DIYPNP since my ecu has a inboard knock sensing circuit (although it has a timing output to be sent to be sent to an MS, perhaps the DIYPNP's inboard knocksensing circuit could be bypassed?)
So now I have two knock sensors and two knock sensing circuits and I'm wondering what I should do. As far as I see it there are 4 options:
1. Leave the knocksense installed, don't add a knock sensor to the DIYPNP (then I don't get any timing pull when knock is detected)
2. Remove knocksense, add knock sensor to DIYPNP (then I don't have a warning LED for when knock occurs)
3. Install both, leave knocksense independent and then give the DIYPNP its own knock sensor (downside being I have more complexity)
4. Splice wire coming out of knocksense's sensor, and run it to the DIYPNP's ADC1 as well as the knocksense circuit. Then I get both the LED and the timing pull, and leave the currently working system alone
I'd prefer to do option 4 if it would work, but am left wondering if splicing the knock sensors wire would weaken the signal. Any thoughts or input?
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