SidWell Posted May 30, 2008 Share Posted May 30, 2008 I am trying to figure out if I have a vacuum leak. While monitoring the Megatune 2.25 I am watching the vacuum reading. It is usually in the 90 KPA area. How much vacuum can I expect to see while the engine is cranking? How much is normal during idle? Quote Link to comment Share on other sites More sharing options...
X64v Posted May 30, 2008 Share Posted May 30, 2008 30-40kpa at idle is a pretty normal number with a stock cam. With a bigger cam you may see 50-60kpa (based off numbers I've heard quoted in in. hg.). Depending on your altitude, 90kpa will be at ambient pressure or just a little lower. Definitely not a good idle vacuum reading. Quote Link to comment Share on other sites More sharing options...
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