FAST not detecing some knock

[V6 Beast]

This isn't on my car but another with the older fast b2b setup. It has a Caspers knock gauge which is picking up knock at the top of the gears but FAST isn't showing any there. FAST does show a blip of knock here and there on occasion so it's not like it doesn't every show knock but the knock gauge is lighting up every pass. Tune is right on with less the 2% correction. Any ideas?

Thanks

S.

 

[Brer Rabbit]

I would trust the Fast.

I run a bigstuff 3 and I have seen the same thing. I have an old ANS knock detector that goes off occasionally. If ur tune is that close then I wouldnt worry about it. "If the data logs are clean, then you aint lean "

 

[SloGN]

sully the knock guage is before the ecm so i would check the wiring back to the ecm.

BTW the caspers knock gauge is junk in my opinions