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 Adaptronic - Fitting a Knock Sensor (currently 424 views) |
| fxdlidon |
| Posted on: Tuesday, September 16th, 2008, 10:10:44pm |
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As sugested by Grant I'm putting this in it's own thread. I'm not sure how to put a link to it from the 'Sticky' Adaptronic thread so I'll leave that for someone beter skilled in these things to do  A lot of what I'm writing here has already been posted but it's good to have it in one place. If any of this isn't clear, say and I'll corect it or try and explain a bit better.
Why fit a Knock Sensor?
The Adaptronic can, if you let it, sort out the best ignition timing for your particular setup but it needs a few clues as to what its trying to do, a Knock Sensor will tell it when it's got the timing wrong (too advanced) and allow it to adapt. |
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| fxdlidon |
| Posted on: Tuesday, September 16th, 2008, 10:11:23pm |
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What Knock Sensor?
Basically any that has 2 wires coming out of it, in essence it's only a poor quality microphone. I used one from a Volvo T5 2,5, mainly because a mate of mine had them lying around. |
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| fxdlidon |
| Posted on: Tuesday, September 16th, 2008, 10:12:34pm |
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Mounting
Ideally the sensor should be mounted near to a combustion chamber and as far away from any other mechanical noise a possible. The best compromise I could come up with for this was the lower bolt on the exhaust cam end cover (see pic), it's not perfect but it seems to work. I'm sure there's a better solution but getting to my engine and finding it isn't the easyest job in the world! |
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| fxdlidon |
| Posted on: Tuesday, September 16th, 2008, 10:13:23pm |
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Wiring
The sensor need to be connected to the Yellow/Green (Knock) and the Brown (Sensor Ground) wires on the 20 pin connector. Use screened wire to connect from the sensor to the ecu to reduce electrical interferance: one wire from the sensor should be conected to the screen and then to the brown on the ecu, the other to the screened core then to Yellow/Green.
Once you've done this, connect up your lappie, and check the gauges window in wari - the knock should now be showing numbers when you blip the throttle, asuming it does everything is connected up and working. |
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| fxdlidon |
Posted on: Tuesday, September 16th, 2008, 10:15:58pm
 Attachment: knock_sensor2.jpg - 23.64 KB (431 views) |
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| oops! forgot the mounting pic |
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| fxdlidon |
Posted on: Tuesday, September 16th, 2008, 10:18:10pm
Attachment: backgroundnoise.jpg - 40.48 KB (431 views) |
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Calibration
This was the tricky bit, but I found a way of doing it without time on a rolling road. Leave your lappie plugged in and turn on the logging('File->Log...'in wari) then go out for a 20 minute drive. Try and hit all the different rev ranges you can. When yo get back turn off the logging - you will now have a *.csv file with the background noise from the knock sensor at all the rev ranges you need, all you need to do is find the highest value that falls in each range in 'Background Knock Level' window and fill it in, at this point I saw the amount of data and wrote a program to do it for me. I've put it here http://www.mediafire.com/?5z8dwyamxuc
Start the program (pic is a screen dump) and use it to open the log file you just made, after it's processed the file it will show, on the left, the values that need to be entered into the 'Background Knock Level' window (Analogue tab, at the top on the right). Type them in here and click OK, once wari has finished saving the settings that's it, all done  |
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| Avar |
| Posted on: Sunday, October 12th, 2008, 8:53:15am |
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You've made it so easy, cheers Don.
I've fitted mine to the blanking plate that sits at the rear of the head where the air con water temp sender fits. I figured its location is the nearest i can get to the explosion zone and nowhere near any moving items. Probably best place as most problems start at cyl 3 on this engine.
Wiring wise i presumed the brown wire was the one coming from the 20 pin connector and already being used by another sensor, i just made another connection onto it.
Again pics to follow. |
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| Avar |
Posted on: Monday, October 13th, 2008, 5:11:25pm
Attachment: photo0150.jpg - 27.47 KB (371 views) |
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| Looking down the back of the engine. |
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| grant4561 |
| Posted on: Sunday, January 11th, 2009, 12:27:38am |
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fxdlidon
Can you check or redo the mediafire link above for the program you wrote to sort out the knock sensor readings. The link above isnt working .
Ive just fitted Nissan 300zx/200sx knock sensor and the file would help me sort out the settings quickly. |
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| fxdlidon |
| Posted on: Sunday, January 11th, 2009, 9:40:48am |
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| grant4561 |
| Posted on: Sunday, January 11th, 2009, 11:23:07am |
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Thanks Don,
Downloaded and ran the program, all good now. |
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| Chernoby1 |
| Posted on: Wednesday, June 17th, 2009, 2:57:09pm |
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| Quick Question... Would i be able to use a 3 wire knock sensor? What are the functions of the 3 wires? Only reason im asking is because i might be able to get a 2 knocks sensors (comes as pair) off a bmw e34 M3 for really cheap. |
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| Andy |
| Posted on: Wednesday, June 17th, 2009, 4:47:22pm |
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E34 M3??? that's not possible  The E34 was the 5 Series  |
Drop me a PM if you would like to be added to the ClubCappo Member Map. More details can be found here.
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| fxdlidon |
| Posted on: Wednesday, June 17th, 2009, 8:19:06pm |
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Not sure how a 3 wire one would work. If it's 2 signal wires (one for each sensor) and a common 'ground' then you could just separate the one sensor (with it's 2 wires) and use that.
If it's +ve, ground and signal then I'm not sure - you could post a question on the Adaptronic forum. |
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| grant4561 |
| Posted on: Thursday, June 18th, 2009, 12:29:20am |
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3 wire knock sensor 
Never seen one, as per above all they really are is a microphone with 2 wires and they are pretty easy and cheap to get. |
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| Chris S |
| Posted on: Thursday, June 18th, 2009, 8:23:43pm |
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I bought a pair of knock sensors from a volvo 850 I think. The sensors themselves are Bosch 1270492s.
They both connect to a single 3-pin connector which as Don suggested just provides a common ground a signal for each sensor. I just chopped off the volvo connector as I was going to have to use replacement connectors in any case. |
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| fxdlidon |
| Posted on: Thursday, June 18th, 2009, 10:32:45pm |
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^ exactly the same one as I used I think, it was definately volvo anyway - the other 1/2 of the pair went to Kei so thats 3 of us using the same sensor.
Where did you mount your's Chris? |
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| grant4561 |
| Posted on: Friday, June 19th, 2009, 12:20:49am |
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Ok 1 common griund, that makes sense.
Mine is a Nissan knock sensor which I think is made by Denso and only cost about $ 30.00 AUD.
Bolted it on at the back of the head low down. |
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| Chris S |
| Posted on: Friday, June 19th, 2009, 1:08:54pm |
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Where did you mount your's Chris?
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I haven't yet, it's on the todo-list along with removing the AC to make way for the new intercooler & intake bits
I was thinking of mounting it in the same position as Kei though as cylinder 3 is likely to be running the hotest - even though we won't have any EGR now with the Adaptronics fitted,
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Cappuccino Owners Club › Specific Discussion Boards › Adaptronic ECU › Adaptronic - Fitting a Knock Sensor (Moderators: )
