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  raz0r$harP said:
Although the value at which it flashes can be set..

I used to think my knock levels were okay.. then I've seen 90% of people have lower knock readings than me ;) Time for a retune..

i think the knock on the power fc is a load of crap simply because if u go over a bump or pot hole or the road isnt the greatest --(NSW ROADS) the knock level will b all over the place. if u want to be accurate u would get an exhaust temp reading!... my 2cents worth!

  infected flow said:
i think the knock on the power fc is a load of crap simply because if u go over a bump or pot hole or the road isnt the greatest --(NSW ROADS) the knock level will b all over the place. if u want to be accurate u would get an exhaust temp reading!... my 2cents worth!

I dont think understand how the knock system works ,it's looking for more like harmonics then just bump your a knock to the car. And yes they do work very well or why would a cars like Keir wilsons retain the power fc and hand controller when his running a full metec system (knock detection).

As for knock levels well i think to many people get carried away with the levels as every car is different especially car run fordge pistons and lump cams etc

BUT just concide this that APEXI and i believe nissan don't think there a real issue to you get around 60 knocks as that is when they fire the warning light (not before all they would have set the level lower) all that said most responible tuner will normally stay below 40 or so to give a bit of head room for a bad datch of fuel and or different weather condition to the day of it,s tuning.

pete

  pnblight said:
I dont think understand how the knock system works ,it's looking for more like harmonics then just bump your a knock to the car. And yes they do work very well or why would a cars like Keir wilsons retain the power fc and hand controller when his running a full metec system (knock detection).

As for knock levels well i think to many people get carried away with the levels as every car is different especially car run fordge pistons and lump cams etc

BUT just concide this that APEXI and i believe nissan  don't think there a real issue to you get around 60 knocks as that is when they fire the warning light (not before all they would have set the level lower) all that said most responible tuner will normally stay below 40 or so to give a bit of head room for a bad datch of fuel and or different weather condition to the day of it,s tuning.

pete

okay i was thinking that knock is the knock inside the engine right as u explained the harmonics well that can change quite rapidly esp if u have hard engine mounts and suspension....is this right ...?

i looked at my knock after going over a bump in the road and it changed...? so in other words it is not an accurate reading at all since it did affect the harmonics in the engine....? and therefor it might not be reading the harmonics in the engine but actually the shock from the bump...?

something on your car is f**ked mate if bumps in the road cause a knock reading. I always monitor knock in my car and it is never affected by road conditions. never. and i will include in this burnouts, drag launches, 4 track days and a fair bit of street driving.

exhaust temp reading is really only a good measure of engine effeciency/AFR and is not as quick to react as a knock meter. they are two completely different things for completely different purposes.

  Beer Baron said:
something on your car is f**ked mate if bumps in the road cause a knock reading. I always monitor knock in my car and it is never affected by road conditions. never. and i will include in this burnouts, drag launches, 4 track days and a fair bit of street driving.

exhaust temp reading is really only a good measure of engine effeciency/AFR and is not as quick to react as a knock meter. they are two completely different things for completely different purposes.

ahhaaahah thats a laugh!

so u dont get any knock when going in a pot hole.....?

i find that hard to believe since the vibration is carried through the car...mmmm

but anyways each to your own and ill tell u one thing just had the engine rebuilt ...so its not f**ked!...lololol

im just saying that is not accurate the knock on the power fc.

  infected flow said:
so u dont get any knock when going in a pot hole.....?

i find that hard to believe since the vibration is carried through the car...mmmm

no i don't unless you are talking about a 3 foot deep cavern (which i can't comment on as i've never driven into one). I have been in potholes before, and a couple of times gone offline a little at turn 4 oran park (big bump there) and yes the knock reading didn't change.

I never said your engine was f**ked i said: "something on your car is f**ked" it may be gearbox problem sending a shock through the crank, or a faulty knock sensor, or knock sensor wiring, or it may just be a shit tune. but i can tell you no car i have ever been in has the knock reading affected by bumps in the road...

  Beer Baron said:
no i don't unless you are talking about a 3 foot deep cavern (which i can't comment on as i've never driven into one). I have been in potholes before, and a couple of times gone offline a little at turn 4 oran park (big bump there) and yes the knock reading didn't change.

I never said your engine was f**ked i said: "something on your car is f**ked" it may be gearbox problem sending a shock through the crank, or a faulty knock sensor, or knock sensor wiring, or it may just be a shit tune. but i can tell you no car i have ever been in has the knock reading affected by bumps in the road...

ok ok ok im not going to start answer this if u go over a pot hole or hit the ripple strip at the track and u feel it im sure your engine will feel it....

it may be due to my hard suspension and engine mounts and all the other siffening ..hahah

but im going to argue.

  infected flow said:
okay i was thinking that knock is the knock inside the engine right as u explained the harmonics well that can change quite rapidly esp if u have hard engine mounts and suspension....is this right ...?

i looked at my knock after going over a bump in the road and it changed...? so in other words it is not an accurate reading at all since it did affect the harmonics in the engine....? and therefor it might not be reading the harmonics in the engine but actually the shock from the bump...?

no that is not right

you need to open your eyes a little and think

If yours is doing this, dont just say the pfc is crap and the knock detection does work may you should be asking why is mine not working (because i can safety tell you that they dont all do what your does) and the knocks and haromics dont have to come from inside the motor as i have seen a exhaust touching the chasis effect knock reading before,(your could be as simple as this).

The knock detection system of the std gtr with apexi pfc is one of the single most helpfull tools in tuning the car a tuner can have(trust me i have know tuned a few).

pete

The reason I asked this question was becuase I have just added a power FC to my GTR and the tune is (out of the box) I was told that they have very advandce timimg so I did a dyno run with results of 11.5 A/F and a knocklevel of around 20.

Was told by a Melbourne PFC tuner that anything around 50 to 60 was bad.But then I was reading in PFC FAQ and it said that anything more than 10 was bad.But it sounds like 10 is a bump steer <_< so all is good B)

Thanks

  pnblight said:
no that is not right

you need to open your eyes a little and think

If yours is doing this, dont just say the pfc is crap and the knock detection does work may you should be asking why is mine not working (because i can safety tell you that they dont all do what your does) and the knocks and haromics dont have to come from inside the motor as i have seen a exhaust touching the chasis effect knock reading before,(your could be as simple as this).

The knock detection system of the std gtr with apexi pfc is one of the single most helpfull tools in tuning the car a tuner can have(trust me i have know tuned a few).

pete

i found my knock sensor was f**ked sorry guys!

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