Bosch donut knock sensors install

[mrsr32]

Hi

How has everyone with aftermarket ecu's mounted their bosch donut knock sensors?

Thanks in advance.

[robbo_rb180]

I cut the mount threading off the factory sensor and welded on a bolt to it so bosch sensor is in factory locations.

[Ben C34]

I got a 1/4 bsp plug ( which is the factory thread ) and tapped it , I think to M8

 

[Murray_Calavera]

On 5/26/2022 at 5:43 PM, Ben C34 said:

I got a 1/4 bsp plug ( which is the factory thread ) and tapped it , I think to M8

 

What material was the plug that you used?

[Ben C34]

On 5/26/2022 at 8:16 PM, Murray_Calavera said:

What material was the plug that you used?

Brass

[mrsr32]

Looks like its an m10 thread.  Does anyone have a block they could measure the surface area around the knock sensor?  The donut according to Plex needs 22mm of surface area to contact.

I know on some cars, people just drill out the bosch from m8 to m10.  Wonder if it can be done on an RB.

The JZ have an adapter stud, but they are m12.

[Lithium]

Depends on the block you're using.  When tuning RB30s I use an unmodded M8 Bosch donut in an M12 hole in the block (same as 2Js) using one of these thingys:

https://www.efisolutions.com.au/knock-sensor-conversion-stud-m12-to-m8

 

With RB25/26 I *have* used a combination of drilled-to-M10 donut sensors and they've seemed alright, alternately have just had an M8 and M10 bolt welded back to back to make up a similar adapter stud to the Toyota one you use on RB30s and JZs.

Edited May 26, 2022 by Lithium

[joshuaho96]

Is there anything particularly wrong with the stock RB26 knock sensors? NTK KNE01A as far as I can tell is a wideband sensor. I would have figured if anything is the problem it would be the wiring harness which appears to ground the knock sensor to the block rather than using the knock sensor pins as a differential input. The wires also appear to be unshielded.

[GTSBoy]

On 5/27/2022 at 11:54 AM, joshuaho96 said:

Is there anything particularly wrong with the stock RB26 knock sensors? NTK KNE01A as far as I can tell is a wideband sensor. I would have figured if anything is the problem it would be the wiring harness which appears to ground the knock sensor to the block rather than using the knock sensor pins as a differential input. The wires also appear to be unshielded.

They're probably all using aftermarket ECUs.