PFC Knock levels

[Sy.]

Just wondered what people were gettin on ght epfc for knock levels ?
As im not sure it is the fuel but i get some strange readings some times ....

Can travel along the motorway for 10 min + and have 9/14 and suddenly it goes to 40 sometimes for a nano second and back down . and then be fine for 5 min and do it again ... or 20 min and do it again .

just wondered what other people are getting ?

[nikp]

I get very random readings. Can be nice 30 through boost, come of, great readings, then suddenly 71 or something silly.

[Sy.]

Yeah .. i get that sometimes .. most i had was 75 . was doing 90 and then 5th to 4th and full boost .. but was only for a split second.

[John Yorke]

I have had readings of over 170:eek: for no real reason, came to the conclusion that it must be a 10+ year old sensor gone west, unless you are running unmapped boost levels, cheap petrol [wrong RON] I would not give yourself to many worries, if the above does apply [ie you have altered things since the last mapping session] I would be looking to your next mapping session.
hth

[Sy.]

no i not changed anything apart from bigger IC .
170 .. didnt know it went that HIGH lol ... i think itis this v-power fuel . as my mate (in a BMW) has said his car misfire\'s between 3 and 5 min of runing in the morning . He\'s hooked it up to the laptop and everything is working correctly as it should .

[andysmee]

I get up to 17/18 when cruising and up to 27 when booting it. Different fuels effect it too, Shell V-power gives high readings, BP Ultimate gives lower reading, Tesco 99 gives high readings.

[gonzoninja]

usually I see about 20, think the highest I\'ve ever seen was 28

[stylus350]

I can see 110 starting her up.

[Sy.]

Andy . yeah i have found the same . Ultima gives low readings .. and this v-poer seems to give him ones .

110 starting her up .. that could just be your exhaust and the db frequenzy it kicks out .

[nikp]

I found v-power gave high readings - so i stopped using it. Maybe i\'ll re-try it again, just to see what difference it makes.

[rmagictastic]

i get 4 when booting it, off load i get no more than 15 usually, have on occasion silly readings 60-70 just pootling through town (no boost)

Rmaj

[Herblenny]

Knock sensor could give false reading thru other external factors such as transmission.

Most people say reading is somewhat accurate at high load. Also knock level doesn\'t make much difference until high load.

[A7NTY]

Its just a little microphone essentially so can pick up loads of things. When you need to worry is when you get high readings and you are accelerating on boost. I like to keep mine below 30.