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Power Fc Knock - Again..

nakuma

By nakuma,
in Engines & Forced Induction

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nakuma Enthusiast

nakuma

Posted
Posted

I'm getting annoyed with this.

I've got the car tuned and retuned by Trent a few times now, but the knock levels keep spiking.

I'm trying to get the car ready for track but I'm scared if I drive it hard with the way it is, I'm going to do some serious damage.

I drive the car daily to work and keep it under 4 grand when doing so and get nothing above 20, but occasionally I feel like giving it a boot.

When I do, especially in 2nd and 3rd, I'll sometimes get readings of anywhere between 60-110 up and around the 5-6k mark.

The car feels fine, but I back off anyway.

I can't hear any pinning, but to be honest, I'm not 100% sure I know what I'm listening for.

On the dyno, the car is perfect. a healthy 200kw on the stock turbo (12psi) with std inj, std afm, nismo fuel pump etc.

I'm stumped, I've taken it back to Trent a few times, he takes out some timing, but the spiking still comes up occasionally when I open her up.

Am I getting false readings? Do I need a road tune? Is there something wrong internally? Is there a way to diagnose the issue?

I'm pretty sure I've gotten the lose cells on the tune covered because I've taken it back a few times.

Any help would be greatly appreciated.

Thanks.

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https://www.sau.com.au/forums/topic/359399-power-fc-knock-again/
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The Dan Grand Master

The Dan

Posted
Posted

Trent is probably doing nothing wrong. The engine may not knock at all. 110 would definitely be audible.

The problem is also that you are pushing a stock turbo almost to it's full potential so you are generating a lot of hot air. This may cause knock spikes after a few sustained runs and it may not show up on the dyno

Guilt-Toy Grand Master

Guilt-Toy

Posted
Posted

ask trent to put his knock sensor on the car and take it for a drive and listen to the engine, those knock sensors are designed to pickup knock on a completly standard setup, when you start changing the power outout boost revs and do mods to the car the knock sensors usually start to give false readings.

I don't know how willing trent will be to do this, i guess everything has its price for piece of mind. ie do not expect this service for free.

nakuma Enthusiast

nakuma

Posted
  • Author
Posted

Thanks guys, I'll get onto Trent for a road test when I've got some week days off.

I'm going to take your advice and drop a few PSI - only problem is, it's a manual turbotech boost controller and I've never fidled with it. Do I turn it clockwise or anti-clockwise? How much turn it for 1-2PSI?

r33cruiser Grand Master

r33cruiser

Posted
Posted

What condition are you plugs in?

I had the same problem, took it to my mechanic. He pulled out the plugs. They were in terrible condition. The ceramic on number 1 and 2 cylinder plugs were actually SHATTERED from the heat.

Replaced the plugs and the problem went away

nakuma Enthusiast

nakuma

Posted
  • Author
Posted

I turned the boost controller down a quarter of a turn gave it hell on the way to work today.

Maybe it was partly due to the hotter weather but she ran perfect - the knock levels never went about 21.

SAU saves the day again!

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