Knock sensor frequency

[Richie-Van-GTi 72 2 Cars]

I need to get the knock sensor set up correctly or replaced on my car.

Im using a knock sensor from an XU10J4R engine on my XU5JA. I run an adaptronic ECU and need to set up the correct frequency. Not something I have come across before, does anyone have any idea what kind of values I should be using, I was led to believe it is a calculation based on bore, stroke and compression ratios but cant find any real info about this?

[petert 588]

No idea, but I know who does. Join Guild of EFI Tuners FB group. Ask the same question and tag Andy Wyatt. He was the guru of Adaptronic before Haltech bought them out. He now works for Haltech. The R5 and R3 are his masterpieces which would have been Adaptronic products.

[Thijs_Rallye 87 4 Cars]

Don't forgot to add to the post that you will be measuring the knock on the 3rd crank bearing cap and not on the block near the fire ring.

[Richie-Van-GTi 72 2 Cars]

On 11/28/2024 at 5:57 AM, petert said:

No idea, but I know who does. Join Guild of EFI Tuners FB group. Ask the same question and tag Andy Wyatt. He was the guru of Adaptronic before Haltech bought them out. He now works for Haltech. The R5 and R3 are his masterpieces which would have been Adaptronic products.

Thank you, I've done a join request, always wondered what Andy is doing now.

[Richie-Van-GTi 72 2 Cars]

21 hours ago, Thijs_Rallye said:

Don't forgot to add to the post that you will be measuring the knock on the 3rd crank bearing cap and not on the block near the fire ring.

How do you know its there, I don't even recall myself where it is

[Richie-Van-GTi 72 2 Cars]

Found a picture of the engine, circled where the map sensor is mounted. @Thijs_Rallye is this where you meant?

 

[SRDT 180]

Thijs is referring to the XU9J4 knock sensor postion on a special bolt (8) on the the 3rd bearing cap:

What you have here is more like the XU7JP4 setup but the XU5 block lacks the proper mounting point, they have it closer to the headblot thread:

 

Edited November 30 by SRDT

[Thijs_Rallye 87 4 Cars]

As Baptiste said . Interesting to see they've adapted the casting for the XU7.

[petert 588]

I’d use an XU9J4Z #3 cap bolt.

[Richie-Van-GTi 72 2 Cars]

Thanks, does anyone know the part number for the mi16 bolt and will it fit my engine?

[SRDT 180]

08	0132 32	01	SCREW COLUMN - INJECTION XU9J4 UP TO 10/1990
	0132 34	01	- INJECTION XU9J4 SINCE 10/1990

 

It should fit just the same on a XU5 block... if you can get your hands on one.

It wasn't even used on all XU9J4, only those with 55 pin ECU so all cat engines and also non cat since MY 91.

[petert 588]

I may have a few, or know where to find one. Every 1.9L Mi16 sold in Australia had one. I can't look until after 16 Dec however.

 

I used one recently on a turbo 8V I built.

 

Easy enough to make one too, if you have a lathe.

Edited Thursday at 05:22 AM by petert

[Thijs_Rallye 87 4 Cars]

@petert Weren't these just regular-ish M8 standoffs like in the picture? I haven't seen one in ages irl though, so I can't remember. If it looks like the one on the right I could find a similar DAF partnumber.

 

 

 

  

[SRDT 180]

It's a bit taller, the screw that is replaced is a H8x35mm one with 1.25mm threads and 8.8 grade.