Knock related question

General Tuning Questions And Discussions
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Knock related question

Postby Wiggles93 » Mon Nov 16, 2020 9:51 am

Hi guys been playing with my vy l67 , seems im detecting knock at almost every fast gear change (manual) and when I blip the throttle but not under load or high rpm, could this just be mechanical noise? Doesn't (seem) to knock under load or high rpm , should I just pull more timing till it stops or
Is there a good way to check without buying knock ears?

Vy almost stock l67 running flash na computer
Shhh, it hasn't broken yet

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Re: Knock related question

Postby immortality » Mon Nov 16, 2020 11:51 am

Is it a stock L67 bin modified to suit the flash pcm?

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Re: Knock related question

Postby vlad01 » Mon Nov 16, 2020 3:35 pm

probably false knock (mechanical noise) , real knock happens under high load WOT and high rpm. Quite rare for it to happen outside of those conditions.

knock ears is the only way to confirm and in my experience the factory knock detection is hit and miss at best, false knock counts and no knock counts where there is real knock, in fact I have not yet seen a real knock event correlate with detected event.
I'm the director of VSH (Vlad's Spec Holden), because HSV were doing it ass about.

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Re: Knock related question

Postby immortality » Mon Nov 16, 2020 5:16 pm

I noticed similar knock on our L67, mostly on throttle tip in which is why I believe the L67 tunes have fairly aggressive burst knock settings.

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Re: Knock related question

Postby Wiggles93 » Mon Nov 16, 2020 6:34 pm

The tune is one I've made up with a fair bit stolen from a l67 tune, I can post it up if it helps anyone.
I'm glad to hear it could just be mechanical noise, I had been pulling timing with no noticeable result's and was starting to worry, I'll look into burst knock settings and perhaps some decent knock ears funds permitting
Thanks heaps for the replies
Shhh, it hasn't broken yet

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