zek Posted July 5, 2012 Report Share Posted July 5, 2012 Hi - Just going through the process of setting up my Vipec digital knock interface with my V88 and would appreciate some help. The first query is regarding the knock frequency - I have recorded and analysed several instances of knock all appearing clearly at 11.3 Khz. This is odd however as my cylinder bore is 84.5mm - putting the calculated frequency at around ~6.8 khz, or ~13 khz 2nd harmonic. Is this due to my knock sensor type? - (I am using stock siemens sensors, the engine is a BMW M54B30). I am unsure if I need to set the knock filter at 11 khz narrowband or use the 2nd harmonic wideband setting? I have attached 2 instances of knock (recorded in wavepad). The next problem I am having is the ECU does not appear to be receiving a digital knock feedback signal from the knock interface, I have checked wiring and software settings, but the ECU is not seeing any frequency reading from the input, so the knock system does not work. - I will hook a scope up to the knock interface over the weekend to test the output - but just wondering if there is anything else I should check or is there a way to test the interface? Thanks, Ben Quote Link to comment Share on other sites More sharing options...
zek Posted July 5, 2012 Author Report Share Posted July 5, 2012 Edit: see below Quote Link to comment Share on other sites More sharing options...
zek Posted July 6, 2012 Author Report Share Posted July 6, 2012 Sorry guys, if you are having troulble with that link I have zipped a wav here. (can not attach wav files directly )knock01.zip Quote Link to comment Share on other sites More sharing options...
zek Posted July 6, 2012 Author Report Share Posted July 6, 2012 Made a little progress - I have got the interface to work with the Vipec but only intermittently. It appears the ECU is disabling the knock control on about 50 percent of startups because of a DI5 pulllup error. The knock input is configured to DI6, and pulllup is turned off so I don't know what is causing it to be disabled intermittently. Quote Link to comment Share on other sites More sharing options...
Scott Posted July 11, 2012 Report Share Posted July 11, 2012 Good afternoon, Apologies for the slow reply. Which version of firmware are you running? Are you able to send me your basemap to do some testing on? [email protected] Scott Quote Link to comment Share on other sites More sharing options...
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