Picking up "phantom" knock
#1
Evolving Member
Thread Starter
Picking up "phantom" knock
I'm picking up phantom knock at around 5-6K Rpm.My tuner had the defcams on and said it wasn't real knock.
I know my car is almost due for a new timing belt,could it be that the pulley is causing this noise and the knock sensor is picking it up as knock?
I know my car is almost due for a new timing belt,could it be that the pulley is causing this noise and the knock sensor is picking it up as knock?
#2
EvoM Guru
iTrader: (9)
The further you go from stock the more likely you will have to deal with phantom knock. Mivec,exhaust,cams,valvetrain all generate some degree of noise. Your tuner will have to spend some time adjusting the knock sensor tables, using det cans and logging knock sensor voltage. Its also a good idea to replace or check the knock sensor tightness.
Any voltage over 2Volts is considered knock IMO and should be treated as real. You can also add octane and check the phantom knock in that area. If it doesn't go away and there isn't any knock voltage then its not real.
There is also some good reading in merlins guide about it.
http://evoecu.logic.net/mirror/merli...UIDE-V1.7a.pdf
Any voltage over 2Volts is considered knock IMO and should be treated as real. You can also add octane and check the phantom knock in that area. If it doesn't go away and there isn't any knock voltage then its not real.
There is also some good reading in merlins guide about it.
http://evoecu.logic.net/mirror/merli...UIDE-V1.7a.pdf
#3
Evolving Member
Thread Starter
Thank you very much for the reply,I'm really worried about this...
Where is the knock sensor located? Maybe I can check the tightness and eliminate that for now.
Where is the knock sensor located? Maybe I can check the tightness and eliminate that for now.
#5
Evolving Member
Thread Starter
Thanks for the help guys.
It's quite strange because this only started recently and I haven't changed anything.Today I checked all bolts and nuts for tightness including the downpipe and exhaust brackets.
It's quite strange because this only started recently and I haven't changed anything.Today I checked all bolts and nuts for tightness including the downpipe and exhaust brackets.
#7
Evolving Member
Thread Starter
Retarded timing and added fuel,but it's still the same.It doesn't happen at every pull,sometimes nothing,and then the next one....knock.
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#9
Evolving Member
Thread Starter
Yes he's got logs.But after this he said to go fetch the det cams because we tune on the road and that's when he didn't hear anything and said it was phantom knock.He basically just reinstated my old maps because he had to remove wastegate duty cycle due to overboost caused by a torn vacuum pipe.
So strictly speaking nothing was changed he just put my old maps back on and we did a few logs to make sure everything is still fine,and that's when we picked up this knock at 5000 rpm.
So strictly speaking nothing was changed he just put my old maps back on and we did a few logs to make sure everything is still fine,and that's when we picked up this knock at 5000 rpm.