I have a problem with my RB5, it has an apexi PFC fitted, when it boosts over 1 bar the knock level reading on the commander goes right across the screen, the CEL light flashes and there is a weird metallicy scraping noise that seems to come from the turbo area.
Anyone got any ideas?

 

Any modifications to the car?
Have you checked to see if the heat shield is secure?

Tony

 

if you press up on the controller it will tell you the knock number what is that reading?
the highest mine has gone is 8