hi guys,
just wanna run this by you guys and see what you\'s have to say,
i have my pfc in a few weeks now and mapped. i noticed that for the first few days the max knock was bout 73 then in went to 79, 81, 86, and now the highest i\'m seeing is 89,
anyone any input on this. if its picking up vibration is something getting looser. if so where should i look first.
or is it nothing
replace the knock sensor, if your still getting high readings I\'d get it looked at sharpish.
when do you get knock? is it only when you boot it? or just randomly? or at idle? or when?
sorry i should have mentioned it always seens to be about 2500-3000 rpm. that it peaks in every gear. there is always soe degree of know there one i\'m above normal idle. but usually goes over the 60 around the above revs
usually you would only get knock at higher revs when you are driving hard, if you are seeing knock at idle and low revs it is more likely to be a faulty knock sensor
Either faulty knock sensor, or does your car backfire ?? if it backfires it will send the knock reading higher than possible, i saw 159 once :2Confused after 2 loud backfires :Giggle
If neither of those get the map checked out as the figures you have mentioned are creeping into the danger zone
Quotesorry i should have mentioned it always seens to be about 2500-3000 rpm. that it peaks in every gear. there is always soe degree of know there one i\'m above normal idle. but usually goes over the 60 around the above revs
i have the exact same problem,(same reading same revs) but mine\'s not mapped yet, running on a base map, waiting a DP fit, i thought it was the Knock sensor also. so fitted another and got same readings, i\'m hoping mapping will do the trick, but changing HT leads to magnicor. hoping it may help.
where can i buy a knock sensor. are they dealer only or is there better aftermarke ones available
it was showin similar knock patern before i got the map
she hit 91 this morning.
i think you can either get them from mazda but they cost about 100 quid, or you could get one from one of the tuners they usually have a few second hand ones.
I dont think its worth trying to source a aftermarket one.
I got one from jimmys: http://www.jimmys-rx7.co.uk/
it was a couple years ago and i think it was about 30 quid
thanks man i\'m gonna ring the guy who mapped it later today to see what he thinks
i get up to 90 but very low under boost so sure its my knock sencor
Quote from: tezz12345i get up to 90 but very low under boost so sure its my knock sencor
certainly sounds like it, mine just use to flicker randomly mainly at idle then i had another fauty one, then the current one works fine, and i know it works, my car wasant fully mapped and when i took it up really high revs in 4th a while back it flickered slightly and i seen around 70 on the commander.
Around 70 is OK isn\'t it? I don\'t get the light flickering on mine at that (which is about the highest I\'ll see, 73 or 74 I think is the highest recorded).
mine was only flickering but cause it was faulty, wasant getting true knock
if i was getting true knock at 80-90 would that not be too much
Quote from: powermysterif i was getting true knock at 80-90 would that not be too much
If it was true knock, it would have gone pop by now :D
thats not too bad, but you shouldnt be getting that all the time, must be something going wrong somewhere, running lean or something
Could be that you\'re hitting a resonant frequency in the 2.5k-3k rev range causing spurious knock readings.
thats what i was thinking that something external was making noise. and knock was picking it up. is there any prime suspects for this.
My knock readings are around the 120 mark.:2eek
Thats on a rebuilt engine with compression readings of 8+ all round.
If you blip the throttle readings are around the 40 mark.
Carl said with readings were that high the engine would have gone pop.
That was 18 months ago and all still ok.
got 94 today just cruising along. i didn\'t get though to mapper yet. so i tried a little experiment. i got petrol and accelerated hard in first and second using both turbos. max knock was 75. i give up trying to understand this car.