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Knock Went Up To 219 On Idle?

VSPEC-Boy
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VSPEC-Boy Contributor

VSPEC-Boy

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Posted

Hi Guys,

I own an R33 GTR, got it tuned last monday making 275awkw's.

Was very happy with the tune and the most it would ever knock was about 48 when I was giving it alot of stick, which is well below the danger levels.

Last night I was doing some spirited driving and I hit the rev limiter accidentally in second gear and I saw my engine light come on, checked my FC Hand controller and knock went up to 168!!

Pull over straight away and my catch can looked full of oil, no tapping sounds in the engine, took off the engine cap oil looks brown(perfect), no smoke coming out from the back. basically everything sounded perfect.

Really weird thing is that under no load just sitting on idle tapping the throttle it goes up to 219 knock? wtf how is this possible?

I just drove my car straight home and didn't take it over 2K.

I am taking it back to my tuner first thing tomorrow morning, and im hoping its nothing too serious... i.e rebuild.

What are peoples thoughts on the matter?

Thanks,

Harry

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Guilt-Toy Grand Master

Guilt-Toy

Posted
Posted

ignore any knock readings when your on the rev limiter.

plumb your catch can to drain back to the sump. your tune sounds fine. the knock sensors are probly shit and not working properly hence the false readings. if you cannot hear it knocking if it goes over 100 then its not knocking

STATUS Grand Master

STATUS

Posted
Posted
Define "spirited driving" so i can help diagnose the problem

Guilt toy, are u still coming to melbourne with ur gizzmo?

got one you can borrow if you need it, hows the rex coming along?

VSPEC-Boy Contributor

VSPEC-Boy

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ignore any knock readings when your on the rev limiter.

plumb your catch can to drain back to the sump. your tune sounds fine. the knock sensors are probly shit and not working properly hence the false readings. if you cannot hear it knocking if it goes over 100 then its not knocking

So its probably just an electrical problem then?

Very strange that it started happening right after I gave it a bit of hard time though? Thats why I thought I had done some serious damage etc.

I will take it in to the mechanic first thing in the morning though and we'll see how it goes.

Taso84 Mentor

Taso84

Posted
Posted
got one you can borrow if you need it, hows the rex coming along?

Thanks mate, appreciate it, altho i think you got me mixed up with another Taso coz i don't have a rex. If i come down with a slab do u reckon u can perform the test for me. Guilt toy mentioned that he had to do some modifications to the knock sensor to make it work on the his 33.

Guilt-Toy Grand Master

Guilt-Toy

Posted
Posted
Thanks mate, appreciate it, altho i think you got me mixed up with another Taso coz i don't have a rex. If i come down with a slab do u reckon u can perform the test for me. Guilt toy mentioned that he had to do some modifications to the knock sensor to make it work on the his 33.

yeah thats to use the knock sensors in the stock rb25 positions. im sure trent has places that he mounts them that he can show you.

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