badjuju Posted October 5, 2006 Share Posted October 5, 2006 My vaccuum reads 9 inches of mercury at idle, is this a tuning problem? Quote Link to comment Share on other sites More sharing options...
kcelectronics Posted October 5, 2006 Share Posted October 5, 2006 How long is a piece of string????? You need to tell us what the engine is and what mods if any it has? But 9" does sound very low at idle (depending on the Cam etc.) Quote Link to comment Share on other sites More sharing options...
z-ya Posted October 5, 2006 Share Posted October 5, 2006 You are probably running around 280 for cam duration, right? Is it NA? If it is, you only have 9in/hg (30kPa) of tuning range per load band. The pressure resolution in MSExtra code is 1kPa. You can set your 12 pressure (load) bins to start at 100kPa (top), down to 67kPa on the bottom. Do 3kPa increments. If you find that you do not have anough adjustment resolution, you can always switch to Alpha-N mode, which only looks at throttle position, not manifold pressure. I think you should be able to do it in speed density (standard) mode. Quote Link to comment Share on other sites More sharing options...
badjuju Posted October 5, 2006 Author Share Posted October 5, 2006 Stock cam in a stock l28et. Measured using a boot gauge which reads inches of mercury on the - side and psi on the + side. Quote Link to comment Share on other sites More sharing options...
z-ya Posted October 7, 2006 Share Posted October 7, 2006 It should be pulling 15-20 in/hg, so you probably have a vacuum leak. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.