boxman Posted November 23, 2014 Share Posted November 23, 2014 First look into the learned values, not experienced enough to translate. Is this telling me that I have a boost leak? Edit to add: completely stock Link to comment Share on other sites More sharing options...
Brian3676 Posted November 24, 2014 Share Posted November 24, 2014 You could be developing a small leak, technically Cobb considers +-6% to be spec. Link to comment Share on other sites More sharing options...
xt2005bonbon Posted November 24, 2014 Share Posted November 24, 2014 Red values would mean boost leak (pulling fuel as not all the measured air did get into the combustion chamber). Blue values would mean vaccum leak (all the measured air + an unknown amount got its way into the combustion chamber). Search for vacuum leak pre turbo. Search for boost leak post turbo. Usual method I use: see bold part in http://legacygt.com/forums/showthread.php/checking-general-health-your-engine-and-tune-210369.html Most people like to see these four values within +/- 5%. On another note, you got some flkc registered. That -6.65 is quite a lot. You may have something rattling around that the knock sensor is picking up.. Link to comment Share on other sites More sharing options...
boxman Posted November 26, 2014 Author Share Posted November 26, 2014 Rattling heat shield, seems as though I have a rock or something in there. Link to comment Share on other sites More sharing options...
MasAyinde Posted January 15, 2015 Share Posted January 15, 2015 Red values would mean boost leak (pulling fuel as not all the measured air did get into the combustion chamber). Blue values would mean vaccum leak (all the measured air + an unknown amount got its way into the combustion chamber). Search for vacuum leak pre turbo. Search for boost leak post turbo. Usual method I use: see bold part in http://legacygt.com/forums/showthread.php/checking-general-health-your-engine-and-tune-210369.html Most people like to see these four values within +/- 5%. On another note, you got some flkc registered. That -6.65 is quite a lot. You may have something rattling around that the knock sensor is picking up.. The same leak can be both a vacuum leak AND a boost leak Rattling heat shield, seems as though I have a rock or something in there. Maybe a loose bolt? Link to comment Share on other sites More sharing options...
xt2005bonbon Posted January 15, 2015 Share Posted January 15, 2015 ^ Nice bump OP, what's the update? Link to comment Share on other sites More sharing options...
boxman Posted January 16, 2015 Author Share Posted January 16, 2015 Rock in heat shield removed. Small leak in progress of repair, I've got a pile of parts...vac hoses, PCV, catless up, catted down and more to buy...turbo inlet, intercooler bullet proofing, etc. all on tap for replacement in the near future. Oh and a tune to support the mods. Link to comment Share on other sites More sharing options...
xt2005bonbon Posted January 16, 2015 Share Posted January 16, 2015 Good plan. I also had some rocks stuck in a heat shield on the mid pipe of my obxt. It was causing some excessive 'knocks' at a certain rpm range. Once they were removed, knocks disappeared. Where is the leak? Link to comment Share on other sites More sharing options...
boxman Posted January 17, 2015 Author Share Posted January 17, 2015 10 year old hoses etc is my guess. That and a very small amount of oil seep from the IC. I'm taking a shotgun parts at it approach and will re-evaluate along the way. Everything on the list needs to be done regardless of tiny leak or not. Link to comment Share on other sites More sharing options...
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