Knock voltage reading 0

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May 26, 2005 | 06:00 PM

#16

djmikeymike

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From: eastern pa

Quote:

Originally Posted by Gruppe-S

Mike,

Have you double check the connection to pin 78 and the connection to the knock sensor? I just talked to the PLX engineer and he asked you to plug in a headphone to the stereo jack to listen for any knocks. Please let me know.

Thanks,
Tom
Gruppes
510-783-5300

i checked my wiring again and the pink wire is hooked up to pin 78......i pluged in my headphones and i hear ticking......i routed the knock sensor to analog input 3 on the r-500 and the highest voltage i recorded was .5volt and that was at 6500rpms....and i tryed different grounding points for the r-500 and that did nothing

May 26, 2005 | 07:30 PM

#17

GTVEVO

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From: Ozark, MO

Quote:

Originally Posted by GREDDY

I'm interested in learning these knock issues. Since I installed my HKS 264/272 cams, I've been seeing knock counts up to 40-50. This only happens on warm to hot days. The hotter the day the more knock counts I see on my SAFCII. I see knock counts up to 30-40 on idle at a stop light on a hot day. Now in the morning or cool days/temperature, I get no knock at all. Before the cams, I'd be lucky if I see 10 counts of knock. Can anyone explain this?

What you are seeing is perfectly normal. The hotter it gets outside the louder your car will get and the more sensitive to knock it will be. If you wasn't seeing any before the cams it is probably some valvetrain noise due to the extra lift causes it to be louder. I had the same results when I ran the AFC with the same cams. 40 counts isn't real knock. If it is setup correctly in calibration and depending at what rpm you are at knock will only be probably in the 150-200 range or higher. The best thing you can do with the AFC is just keep a close eye on it so if it goes up drastically you know somthing isn't right.

Last edited by GTVEVO; May 26, 2005 at 07:33 PM.