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high knock sum count at low loads

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Old May 28, 2013 | 07:55 AM
  #1  
zigzagzok's Avatar
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From: singapore
high knock sum count at low loads

hi
Cld someone shed some light on my datalog?
Seems that I am getting lots of knock at loads 70+/- at gear 1 / 3 @ <2k rpm
possible that the knock sensor is picking some clutch chatter?
Can i safely ignore this?
Am driving an AUD SST..
Mods limited to pon-cams; grimspeed 3 pot.. still on stock air box.
much appreciated!
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Old Sep 4, 2013 | 06:37 AM
  #2  
Eshark's Avatar
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From: Houston, TX
Not sure of the answer, but I have the same problem. I can't hear the knock, but its detecting high counts.
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Old Sep 5, 2013 | 12:49 AM
  #3  
richardjh's Avatar
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From: Australia
Normal for 4B11, it seems.


https://www.evolutionm.net/forums/ev...explained.html

https://www.evolutionm.net/forums/ev...-rpm-load.html


I put back the stock map on my RA one time, with nothing but Mode23 logging enabled... and took it for a drive in the hills. Put SST in dumb AUTO/NORMAL mode. Guess what -

Heaps of knock, load 60-70, 1200-2000 RPM. Factory tune, factory vehicle. Lots of knock, like 6-12 knocksum.

At these low loads, cylinder pressure is low. It's not going to grenade or anything, by all accounts.


This sort of thing is why tephra's "KnockCEL" ECU patch has a "Minimum Load for KnockCEL" value (normally set around the 100-load mark).

Rich
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