202 knock sensor

[Donyboom]

I've noticed a few people here that are doing the 202 vk efi Delco conversion have been asking about knock sensors. I was wondering if the knock sensor from an amc jeep 258 l6 engine would work considering those two engines are disturbingly similar.

Does the knock filtering occur in the ecu or is it more to do with the sensor itself?

[Dazza92VP]

The problem isn't so much the sensor but the knock board on the memcal is set to pick up certain frequencies dependant on a certain bore size hence the reason you can't use a v6 3.8 knock sensor on the v8 and viva versa it'll pick up false knock and may not pick up actual pre det at all

[antus]

Yes thats right, cant really use the knock sensor as above. Festy designed a tunable sensor but its NLA because the main chip is NLA. Even so the frequency filter method was very... lets say 1st gen and didnt work over x rpm (about 3000?) due to mechanical noise in the engine (rpm is a scalar). Essentially set the knock sensor on temp to max (about 150 degrees) so it never enables and pretend its not there. Tune preferably on a dyno for MBT. Preferally with knock ears. Else use sensible timing and leave it at that. This should still provide good results. It'll cost you a lot of time to squeze the last 5% out of it safely. Usually its not worth doing and many (most?) tuning shops also wouldnt risk pushing the timing too close to the line and would pick reasonable timing and chase best fuel mixtures.