Knock Value On Pfc

[FLO]

Just wondering what is dangerous knock level on a PFC.I was told 50-60, but read on PFC thread 10? whats the go? Car now dosnt go any more than 20 is that ok?

Thanks

[Guest two.06l]

Just wondering what is dangerous knock level on a PFC.I was told 50-60, but read on PFC thread 10? whats the go? Car now dosnt go any more than 20 is that ok?

Thanks

<{POST_SNAPBACK}>

thats sweet mate

Edited August 24, 2005 by two.06l

[wilch]

Mine peaks around 22 on bad days (hot).

I heard more than 30 frequently is bad.

[wilch]

60 will get the check engine light flashing. Get off the gas if you see the light flash .

[raz0r$harP.UK]

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..

[infected flow]

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..

<{POST_SNAPBACK}>

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!

[pnblight]

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!

<{POST_SNAPBACK}>

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

[infected flow]

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

<{POST_SNAPBACK}>

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...?

[Beer Baron]

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.

[infected flow]

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.

<{POST_SNAPBACK}>

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.

[Beer Baron]

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

<{POST_SNAPBACK}>

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...

[infected flow]

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...

<{POST_SNAPBACK}>

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.

[pnblight]

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...?

<{POST_SNAPBACK}>

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

[GunMetalR33]

I assume you guys are all talking about the Peak Knock value right? If you are concerned about knock over 60 then put your hand controller in graph mode then monitor the knock. I think most of you will find that the knock only lasts for a fraction of a second...

[FLO]

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

[infected flow]

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

<{POST_SNAPBACK}>

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

[Cubes]

My knock levels are not influenced by the road conditions.

If you are getting a little knock when coming off the throttle or randomly, check your injectors as they may need cleaning.

Edited August 29, 2005 by Cubes

[infected flow]

My knock levels are not influenced by the road conditions.

If you are getting a little knock when coming off the throttle or randomly, check your injectors as they may need cleaning.

<{POST_SNAPBACK}>

okies cool thanks