Knock with SAAB APC

[Mihnea Cotet]

I've had a few occasions where I was being forced to tune 20vt engines by 
ear due to overtorqued knock sensors that didn't give a correct output 
signal when knock occured and the ECU didn't do anything against it. Kind 
of sucked but worked ok (with a microphone in the engine bay though) and 
one of the cars has done 30k+ miles on the remap at 360+ HP and 420+ lb/ft 
of torque. When we later fitted 2 brand new knock sensors, the ECU has 
never pulled the advance back due to knocking, and now it's sure they were 
good as the ECU would retard the advance with no audible pinging on 95 RON 
fuel (tuned it for 98 RON).

But it had forged pistons as it was an AAN motor...


Mihnea

At 11:01 9/01/2004 -0500, Brett Dikeman wrote:
>At 3:08 PM +0000 1/9/04, Alan Pritchard wrote:
>
>>  plus these guys can probably tell/hear/predict knock with their 
>> god-like abilities ;)
>
>God-like indeed, because knocking you'll never hear can cause engine 
>damage.  When you hear it, it's VERY bad.
>
>NEVER 'tune' by ear.
>
>Brett
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