knock level

[R33-JET]

was just looking through my power fc commander

and wanted to know wat the knock level should be under

and how it works

and wat effects the knock level

thanks

[crooser]

i think the knock sensor is a factory peizo microphone type thingy that measures DB levels. I assume the PFC is similar to a Link in that you can set the knock sensitivity level, and anything over this level gets registered so you can monitor any bad stuff that you couldnt normally hear when your "up it".

I'm not sure if "knocking" and "pinging" are the same thing. Maybe someone else could expand a bit more for us all.

[R33NT]

My car isnt tuned to well at the moment so i keep a good eye on the knock sensor (the little bar and the peak figure).

Here is what i know. Firstly providing you have an option set (cant remember where it is, i think it is in the menu where you select yes and no in japanese) in that menu then if the knock goes above 60 it will flash the check engine light. I have been told 60 is BAD but if you see it peak up around 30-40 it wont kill your engine (providing you dont see 30-40 all day everyday) but repeated excursions to that amount of knock wont help the engine.

I know that there is a person in this forum who is a total gun with the power fc. He could tell you more, i just dont know his nick.

[jtir]

At the moment, I've seen knock levels a maximum of 60 under full flat shiffting

Normal levels with every day driving and overtaking, I hit a value of 20-40.

Even when starting my car on a cold morning, I get knock value of 2.

[2rismo]

Yavuz from Unigroup suggested to me that anything under 80 wasn't terrible as long as it wasn't all the time. We re-tuned my PFC a bit richer under load and it only dropped a couple of hp so now even on shit 96 fuel, it never gets past 40.

Adrian

[rev210]

You will start to 'hear' pinging at around '80 to 90'. 40+ isn't good.

I try to tune my car to stay under 20 at any time 0 whilst under acceleration is prefferable.

[Sydneykid]

OK Rev210, how do you tell whether it is 20 or 60 on your standard ECU?

[Gradenko]

Seems like rev's new (fancy) s-afc II has a similar knock readout scale as the pfc. I think you should get rid of "stock ecu" from your sig, rev.

[rev210]

yep the S-AFC II has knock readout. upto 30 seconds of graphical logging that can be played back as well.

The sig. is in refference to the 13.4second pass specs.

I'll change the sig when I get the 12 using the S-afc and cam gear.