Low RPM, high map knock

[robertisaar]

if you hear knock, that is REALLY bad.... the sensor should be reacting long before you can hear it.

get to a cruising point, then just add in 5* to that cell(and probably the surrounding ones), should have a noticable change almost instantly and the KR should become active. assuming you're already close to optimal advance at that location in the map, 5 should push it over into detonation territory, especially with lower grade fuel.

[LZeppelin513]

I tried to test for real knock today. I added 5* of spark at 2200 rpm and 40-60 map where I was cruising. Nothing happened so I upped it until i was adding 10 degrees and still nothing. I went to 12* extra before I got scared went back to original SA. I never heard any knock or felt any difference as I was cruising. I am also running premium fuel at the moment with a bit of octane booster as well. At one point KR became active for a very brief moment but stopped. Also, this was all off a stock timing table that I have not touched, so it is likely not optimized.

Should I try again and add a couple more degrees?

Knock sensor is still working, I got about 15 knock counts when the engine turned off.

[3400-95-Modified]

what was your peak advance at cruise? you may already be at the max timing advance if one exists, so adding that much to the table didn't increase it any.

[LZeppelin513]

It is set at 50 degrees, I think it hit 42 before I pulled it back down to stock.

[LZeppelin513]

Put some regular in it and tested again. This time I got some KR and a couple knocks. Looks like all is well.

[robertisaar]

how far did you have to advance it to run into it?

i can't believe you managed to run 12* extra and didn't run into knock on premium.... that's a lot of extra advance.

[LZeppelin513]

I didn't have to advance it. After I put in regular, I was going to mess with highway fuel because I was going for a long drive. While it was leaned out to 16 or so and under a bit of load it started to see kr and a knock. I figured this was proof enough knock sensor was working. I also tried this with the premium in from earlier and no knocks or kr.