Aasco and what?

[stephen wilson]

Thanks Pro , that gives me some information that make sense, instead of vague references.

[The Radium King]

i thought knock sensors were piezo, ie, they actually listen for a knock sound which will trigger them ... ?

[jaykay]

I had heard of instances where the LWFW can be made to work if you tore the engine down and balanced the crankshaft with the intended fly wheel. I am not sure how you would account for all harmonics this way. Was not aware that the knock sensor used crank speed....wow

Way back when I first got my S, I was I interested in a LWFW to reduce the huge cantilever load on the crankshaft....being worried about the RMS and crank carrier loads ....live and learn

[BYprodriver]

Originally Posted by The Radium King

i thought knock sensors were piezo, ie, they actually listen for a knock sound which will trigger them ... ?

They detect excessive vibration which is why stiffer than stock mounts can be interpreted as detonation also.

[The Radium King]

sound = vibration. i can't help but think ecu's are sophisticated enough to figure all that out, otherwise that death metal i'm always playing would be messing with my timing. i'm no expert on this, but a quick google tells me that the ecu reads two signals - average and peak, and only declares knock when the difference between the two exceeds a certain threshold in order to ensure that it isn't reacting to background noise. they are also frequency specific; ie. designed to 'hear' knock specifically and not just any bang or rattle. so, you would have to overcome at least two checks before a lightweight flywheel or bad engine mount will read as knock.

further, the guys who would notice the effects of pulled timing the most - cup cars, etc., are all running factory GT3 RS lightweight flywheels and, while i am sure they have go-fast ecu maps, i doubt they run different/more advanced knock protocols.