Knock Level!!!!

[McCARTHY]

My knock level reading on the PFC Commander is creeping up every so often and im not too comfortable with it...

What causes the knock level to rise? waht can i do about it.

[Initial-D]

A small mic picks up the knock level. What sort of levels are you seeing, I get about 40-50 or so at most. Although some people see higher like around 80.

[McCARTHY]

Is that the norm then??? I thought that they should be around the 20-30 mark???.....

What causes it, to go up?

[BlitzBoy]

20-30 pah thats nothing, the knock warning light doesnt come one until 60, so you are quite safe

[Initial-D]

It depends on the engine, if it\'s ported it can give you a higher reading.

[dre]

it also depends when you are getting this reading. It may be occuring as you back off the throttle which is fine.

Set your Power FC to monitor 1 channel (knock) so that you can see it clearly and keep your eye on the knock level as you accelerate. I sometimes get high readings like over 130 but it\'s never on throttle/boost.

[nikp]

Phew! Last week i saw a max reading of 111 and was very worried. But if someone here is chilled about seeing 130, then i\'m not going to worry too much! Besides, she\'s still ok now, and as far as i understand it - if you get proper detonation, you can wave goodbye to an apex seal or two.

[McCARTHY]

Nar engine is not ported single turbo though. I\'m not seeing anything as high as 60 but at least i know that i\'m not at risk.... IS the PFC an accurate reading.....

[Laeeq]

it also depends when you are getting this reading. It may be occuring as you back off the throttle which is fine.

Set your Power FC to monitor 1 channel (knock) so that you can see it clearly and keep your eye on the knock level as you accelerate. I sometimes get high readings like over 130 but it\'s never on throttle/boost.

I get the same reading as you come off throattle.  When Max at Reworx was mappin mine, he had to switch the knock sensor off as it kept on buggin.  I think it was causing due to faulty sensor or something..

[BlitzBoy]

well all the PFC is doing is reading the voltage from the Knock Microphone sensor. So the PFC is accurate, all depends on the sensor itself.

[Donato]

The mic can pick up general noise, i usually get readings of 15-20, i had a conversation with pip about my readings when i got a couple that went over 130 under wot and he said it was nothing to worry about...

[McCARTHY]

this is good to know as i was getting worried that mine were high.... but it would appear not  :Thumbs-up

So at what point do you have to worry then?

[dre]

if you are that worried about Knock levels, buy a J&S knock sensor.

If the car is mapped and the AFR\'s are fine then all should be good. It\'s probably better for you to buy an AFR gauge, then you\'d know if you were running lean that you\'ve got a problem.

Scoobytek do a good one (LM-1) i think for £290.

[Donato]

the occasional high knock reading is fine, probably just noise. if you are getting constantly high readings then its time to get the map checked.

[andyrose]

i\'m running a std engine (not ported) HKS intake, hard intercooler pipes, aftermarket down pipe, dragon mid pipe & blitz silencer. i know i\'m on the limit without going down the mapping route (to be done soon as i\'m running just below std boost settings). my highest knock reading (on the PFC) is 30-50 when cruising about 70-80mph. i have been using tesco 99 ron and or optimax to be extra safe.