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Knock Sensor

geno8r

By geno8r,
in Engines & Forced Induction

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geno8r Grand Master

geno8r

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Posted

Hi

I have a SAFCII which has been dyno tuned on my car & runs a dream but i dont think i have a knock sensor connected up to it because the reading from the display is always 0.....

I have no idea what they look like or where they're connected, all i know I'd like one & i'll get my mechanic to install it for me.

So yeh, where can i buy a knock sensor to connect up to my SAFC?

Thanks, :(

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C_DawG Rising Star

C_DawG

Posted
Posted
Hi

I have a SAFCII which has been dyno tuned on my car & runs a dream but i dont think i have a knock sensor connected up to it because the reading from the display is always 0.....

I have no idea what they look like or where they're connected, all i know I'd like one & i'll get my mechanic to install it for me.

So yeh, where can i buy a knock sensor to connect up to my SAFC?

Thanks, :rofl:

Your engine will have a knock sensor built in, two infact I think. No idea of the SAFC connects to these or whatever, never used one.

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geno8r Grand Master

geno8r

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I'll ring up the place which dyno tuned my SAFCII & ask them if they can connect it. I remember the guy saying when he dyno tuned my car on Optimax fuel that it was detonating slightly @ 12psi, he said you wouldnt know it but i did because of the knock reading I had. He would have been using his equipment to monitor the knocking.

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geno8r Grand Master

geno8r

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Well i solved my own problem today.

I downloaded the SAFCII manual off the Apexi site today & went into the Sensor Check on the controller. Yay... i do have a working knock meter, it was displaying raw data. The next was to set it. So i went into the Set Knock & held the rpm at 1500 to get 115 then 3500 rpm to get 117. These were done in neutral as your're meant to & is the raw figures.

Sweet so the knock display now reads around 8 - 11 when ideling @ 700 - 800 rpm. But once i start moving & get above around1500 rpm the knock reading goes to 0. I thought it would still show something higher than 0 so I wound the boost to 12psi & gave it some for a few minutes. I still got nothing, was always displaying 0. The air outside was cool too as for its the end of the day & its been raining.

Im just wondering what figures do other people with SAFCIIs get?

I did the Set Knock feature twice, when i first did it the raw figures were more like 95 - 98. 5 minutes later after mucking around revving it in idle setting the knock the figures went up to 110 - 120.

All of these setting were done after the car already being driven for 30 minutes.

I dont know if 0 is just really good or what’s the deal? I have had the SAFCII dyno tuned & I run 12:1 A/F Ratio's. I might try the Set Knock again on a warmer day with a more average outside temperature.

Any one with experience setting their knock & their display figures would be much appreciated.

Thanks, :cheeers:

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strutto Grand Master

strutto

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That sounds perfectly normal to me mate... Mine does the exact same thing... If / when it pings, you will get a reading of around 80+ for the duration of the pinging...

A reading of 0 whilst accelerating is fine and to be expected with the SAFCII...

You may find your idle knock reading will go as high as 30 when the car has been driven for more than a few hours during the day... This too is normal...

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geno8r Grand Master

geno8r

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Owww sweet sounds good then. Yeh it will be good to know if my engine is detonating now so i can look after it. I was thinking of getting an Air/Fuel ratio gauge too.

Also, have you played around with the Warning setting in the SAFCII, supposedly you can get the SAFCII to notify you or react somehow when a parameter you set is exceeded *eg too high knock figure*. I'll have to have a good read of the manual again.

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