Need Help With Pfc Please!

[BLK R33 GTST]

hi guys

i'm still learning about these cars and i'm having some problems with my PFC. my knock sensor light (engine light) will come on from time to time when i'm boosting it, also comes on if i drop the clutch at hi rpm from standing still. when i went back to the guys who installed it they said it was fine. i have since spoken to another mechanic who said that its been set up wrong and i should not get the light on at all if is tuned properly.....so now i'm very confused.

My car is a series 1.5 R33 GTST it has the following mods;

air filter

3inch turbo back exhaust

front mount cooler

Walbro fuel pump (second mechanic said i need fuel reg as well)

turbo smart bleed valve set at 13.5psi (but doesn't hold it)

and of course a PFC

the car made a 182RWK (i was told by the guys who tuned the PFC that it will make more (around 200) once i get proper boost controller that will hold the boost pressure)

also i'm running a standard turbo

Can some1 plze me help..........i'm very confused and i don't want to kill my car

cheers guys

[N I B]

Does your cars boost spike? if so that can cause this to happen and yes a good boost controller can help this problem.

[paulr33]

13.5psi will fry the turbo. best to turn it down to about 11-12psi at the max. it wont make any more power at 13.5psi but it will make stacks more heat. the fuel pump's flow ratings are rated at 15volts and your skyline (assuming stock wiring only runs 14volts, or even 13) so it wont be flowing at the rating the pump is rated at, so be careful there.

the engine warning light will come on for 3 different reasons. in summary airflow meter, injector max, and knock over 60. the powerfc faq covers all 3 and how to diag / test for which one you are seeing, i suggest you read this and do some quick tests to find if in fact the warning you are seeing is a knock high warning or the other warnings

http://members.dodo.com.au/paul/

Documents -> PowerFC FAQ

[The Mafia]

hhmm... the knock sensor light is coming on hey. 3 flashes?

Have you ever considered that THE CAR MAY BE KNOCKING?

"Guys, I coated my floor with grease, and now I keep slipping over. Why could that be?"

Take it to a decent mechanic and get it tuned properly at 11psi - 12psi before you kill your turbo and motor.

Until then, DON'T hammer your car. You WILL kill it.

[stelth33]

i got told by unique motor sports in castle hill the light comes on because the power fc is set up to have the apexi boost controller and if you dont the computer wont be reading right so go through and turn the boost of of the ecu and it wont turn on i havent done this yet but its what i was told

[benl1981]

Just a side question - my car has flashed the engine light near 5600rpm when I hit the rev limiter. I have the rev limit set to that at the moment. Does it ever flash if you hit rev limit? Knock on the controller was less than 40 peak when this happened.

Set the rev limit low as I haven't had a tune yet

Cheers

Edited December 4, 2005 by benl1981

[sav man]

The light also flashes when your injectors max out. This is at 0.5 sec intervulls (vs 0.1 sec for knocking). When my car was getting rd tuned my injectors were maxing out at 6500rpm (9:1 afr will do that)

I'll finish the Power FC manual traslation over the holidays, and give it to paulr33 to host (if he wants).

[benl1981]

My car want maxing the injectors out though...

[justin911]

u can turn all the warnings on / off to narrow it down...

but yeah like the mafia said the diff amounts of flashes are for the diff warnings...

[bmxwrx]

Why don't you just look at the peak values the hand controller stores?

[paulr33]

Engine light will only flash if (any) of the following 3 items occur

airflow meter max out - reads 5.0volts

injectors duty max out - 98%

knock level too high - default is 60 at any one time

Nothing else that I know of will cause the engine light to flash in the PowerFC.

Bounce off the rev limiter all you like, it wont make the engine light flash.

I believe the car won't start if you have boost control kit enabled and aren't actaully using it / don't have it plugged in but in may in fact have the engine light permenantly on (always) if its activated and not being plugged in

[The Mafia]

well, running almost 1 bar of boost on a stock turbo on a "tuned" powerfc, I can say its got a 70% chance of knocking.

The other 30% I can bet the AFM is maxing out due to the stupid amount of boost and airflow ripping through it. At 210rwkw (12psi), my injector duty cycle never went above 80%, but the AFM maxed at 6500rpm many many times. (rev limiter was at 7200)

Thank god I have an ace tuner.

And I will say again; after 12 months of 210rwkw, and a fair bit of "spirited" driving, compression tests came back at 169psi accross all cylinders, with 2% leak down.

Oh, and Paul is right, if the boost control kit is NOT installed (or not functioning), and it's turned on, the car won't start. (most likely to prevent an overboosting disaster).

Edited December 5, 2005 by The Mafia

[infected flow]

  paulr33 said:

Engine light will only flash if (any) of the following 3 items occur

airflow meter max out - reads 5.0volts

injectors duty max out - 98%

knock level too high - default is 60 at any one time

Nothing else that I know of will cause the engine light to flash in the PowerFC.

Bounce off the rev limiter all you like, it wont make the engine light flash.

I believe the car won't start if you have boost control kit enabled and aren't actaully using it / don't have it plugged in but in may in fact have the engine light permenantly on (always) if its activated and not being plugged in

<{POST_SNAPBACK}>

u forgot one basic thing!

TIMING! ADVANCE TIMING IF NOT TUNNED PROPERLY WILL GIVE U KNOCK!

IF IT PINGS WHEN JUST ABOVE 0- ON YOUR GAUGE THEN CHANCES ARE TIMING !

but i could be wrong...evil laugh bbbwwaahhhhhhhhhhhhh..

okay my 2cents worth

or coil packs might be failing!

[paulr33]

the powerfc faq gives complete information on how to debug each of the "engine" flash symptoms. im well aware of knock and how its timing related, the guide states this also

[sav man]

my car started with the boost control activated (not connected) but the engine light stays on till you turn the boost control off.

[infected flow]

  paulr33 said:

the powerfc faq gives complete information on how to debug each of the "engine" flash symptoms. im well aware of knock and how its timing related, the guide states this also

<{POST_SNAPBACK}>

well im glad u can read but i was offering advice not to you but to the person that asked it.

[paulr33]

ah sorry i may have misread, no offence was meant

[SKY 34]

I sense tention..lol

[MattSR]

"IF IT PINGS WHEN JUST ABOVE 0- ON YOUR GAUGE THEN CHANCES ARE TIMING !"

Which gauge are you referring to?