youknowit Posted November 3, 2009 Share Posted November 3, 2009 Is having knock in vac. something to worry about? Link to comment Share on other sites More sharing options...
Boostin1657615274 Posted November 4, 2009 Share Posted November 4, 2009 only to hypochondriacs On the search for a new DD... Link to comment Share on other sites More sharing options...
NSFW Posted November 4, 2009 Share Posted November 4, 2009 I get some knock activity around idle and cruise, and I don't lose sleep over it. I'm not familiar with Cobb tunes, but I still suspect that you're running the stock timing and fueling when you're in cruise (note, I said cruise, not vacuum). I'm not aware of anything to be gained from messing with that area. However I do think that the stock tune runs too much timing at low load (.5 or so) and high RPM (4000+). I took a few degrees out from that area because I was getting knock when I opened the throttle after engine braking in that area. Link to comment Share on other sites More sharing options...
testes1010 Posted November 4, 2009 Share Posted November 4, 2009 I've found that stock timing for the near idle/low load cruise is too high. I've reduced mine 2-4 degrees in some places and will only pickup 1-2 Knock sum just after startup then no more after that. Link to comment Share on other sites More sharing options...
youknowit Posted November 4, 2009 Author Share Posted November 4, 2009 Right on Right on...Thanks for your help.. Link to comment Share on other sites More sharing options...
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