Hello all ,
i have 350z revup with vortech and upgraded pulleys and fuel system, i installed f con and tuned it.. but knock in logging never read any number .. only zero..
to read knock am i need knock amp? or there is wrong with the harness ? or what? i'm really confused..

any help will be appreciated

even the SPD is 0 all the time..

 

shouldn't have any knock, but my understanding is that, yes, you need the knock amp in order to read it.