VR4 Knock Sensor thread size

[91aussievr4]

Hi guys,

I have just finished wiring my ecu into my VR4, i am replacing the knock sensor as it looks factory and I want an accurate sensor when the boost goes up and its tuned on ethanol. What i need to know is what the thread size is for the factory knock sensors so i can replace it with a bolt and a bosch knock sensor.

Thanks guys

 

[iceman69510]

Oops. Misread original post.

 

[r4pt0x]

What ECU are you using? Knock sensors are often internally damped/filtered with an capacitor and sometimes even with an resistor parallel to the piezo crystal. The sensor has to match what the ECU is expecting...
The old knock sensors which are filled with black plastic are heavily damped/filtered so the ECU doesn't have to apply lots of CPU-intensive filters on the signal. Evo 6+ sensors for example are not damped - all signal filtering is done within the ECU. If you wire an Evo sensor to an old ECU it will constantly read high knock whereas an evo ECU wouldn't read any knock with one of the old sensors until the engine falls apart...

Anyways, sensor thread should be M10x1. Torque any knock sensor exactly to spec or the readings will be completely off

 

[91aussievr4]

Im using a Haltech Elite 1500. I work for Haltech and we carry a Bosch knock sensors that have a 8mm (5/16") mounting hole. Looks like ill need to find another knock sensor that will suit the M10x1 thread