Brief log...rapid knock onset.

[LandoAWD]

Quick log...had to let off WAY early.

I notice my TPS isn't reading 100%, last time it was my old floormats wedged under the pedal.

Anyone care to tell me what may cause the rapid onset of knock at 4469rpm?

Kyle, ideas? If the data is skewed by not being at 100% throttle, tell me and I'll delete this. Also, let me know if you want o2 readings next time I log.


Time RPM Knock Timing Inj P/W TPS
00:06.1 4688 0 42 7.436 81
00:06.3 3812 3 26 9.487 86
00:06.4 3969 3 23 11.282 88
00:06.5 4031 3 20 13.333 88
00:06.6 4031 3 16 16.41 89
00:06.8 4062 3 14 19.231 89
00:06.9 4156 2 14 20.256 89
00:07.0 4188 2 14 20.256 89
00:07.1 4281 2 14 20.256 89
00:07.3 4344 2 14 20.769 88
00:07.4 4438 1 12 20.769 88
00:07.5 4469 8 12 21.026 88
00:07.6 4500 8 12 20.513 87
00:07.8 4594 8 13 20.256 85
00:07.9 4688 8 13 20.513 84
00:08.0 4781 7 13 20.513 83
00:08.1 4812 7 13 20.769 83
00:08.2 4875 7 14 20.256 82
00:08.4 4875 7 14 20.513 79
00:08.5 5000 7 14 20 78
00:08.6 5062 6 15 20.256 77
00:08.8 5156 6 15 20 76
00:08.9 5219 6 15 19.744 75
00:09.0 5312 6 16 19.487 73
00:09.1 5381 10 14 19.487 72
00:09.2 5406 9 15 19.231 65
00:09.3 5406 9 16 18.462 51
00:09.5 5469 9 17 7.692 11

 

[talon1979]

I am sure your tuning knowledge is much greater than mine, but here some random thoughts. In your mod list I didn't see an upgraded BOV, maybe it has started leaking or you have a boost leak. My stock bov was leaking at 12psi. Seeing your 02's would make things easier as well as knowing what your SAFC settings are like.

On my car I saw a knock spike at 4.5k, added fuel, and the problem went away. If adding fuel doesn't help maybe you are getting some type of mechanical knock from a bad motor mount, loose downpipe, or whatever.

 

[LandoAWD]

Originally posted by talon1979
I am sure your tuning knowledge is much greater than mine, but here some random thoughts. In your mod list I didn't see an upgraded BOV, maybe it has started leaking or you have a boost leak. My stock bov was leaking at 12psi. Seeing your 02's would make things easier as well as knowing what your SAFC settings are like.

On my car I saw a knock spike at 4.5k, added fuel, and the problem went away. If adding fuel doesn't help maybe you are getting some type of mechanical knock from a bad motor mount, loose downpipe, or whatever.

Boost leak test went fine, but I am still on the 1g CBV.

I'll write down the SAFC settings tonight, as I can't remember them off the top of my head.

 

[talon1979]

I would pull the return tube off of the BOV and try the running a boost leak test again. Cover the air outlet tube (I don't know its technical term) on the BOV and see if any air is coming out of that baby. I am almost willing to bet that your stock BOV is leaking by 16-20psi.

 

[LandoAWD]

It certainly is food for thought. I'll check it out now that the evenings are longer.