Supra N_A Posted March 16, 2012 Share Posted March 16, 2012 atm on idle my boost gauge reads -0.6 to -0.7 is that ok?? also now since fitted new lambda sensor it reads when I am driving then back of boost reads -0.8 -0.9 ? what does this actually mean ? idle/vacuum pressure ?? what are others readings just to compare its stock boost levels atm with only hks cat back fitted. Link to comment Share on other sites More sharing options...
sideexitsupra Posted March 16, 2012 Share Posted March 16, 2012 You will find that boost readings will go negative when off boost. Basically it means the engine is sucking in more air than the turbo is pushing out. Nothing to worry about as far as I know and quite normal. Link to comment Share on other sites More sharing options...
Dim Sum Posted March 16, 2012 Share Posted March 16, 2012 Yup my reads in minus at idle till the turbo kicks in. Link to comment Share on other sites More sharing options...
BOB B Posted March 16, 2012 Share Posted March 16, 2012 Yes that's fine, mine ticks over at about -0.7 and most of my everyday driving is between that and about +0.2. Link to comment Share on other sites More sharing options...
Josh Posted March 16, 2012 Share Posted March 16, 2012 As others have said, it reads into the minus', then the whistling starts at about -0.1bar then obviously the boost is felt at about +0.1bar upwards. Link to comment Share on other sites More sharing options...
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