Do these numbers look right?

buzzinhalfdozen · 04-07-2014, 11:27 AM

I'm afraid I can't help with the conversion however I do know that on a properly functioning engine (stock) I'll see between 35-40 KPA at idle. With the larger overlaps in the race cams that signal very diminished...which is what you're seeing. Looking at your 2 screen shots you can see when you rev it up the vacuum gets much better and the KPA number goes down, also your pulse width goes lower (less fuel) indicating to me that with the MAP reading it's providing @ idle the ECU "thinks the engine is being loaded, hence the increase in fuel. Have you checked to see what the MAP shows with the engine off? Also it looks like you have a display of vacuum on the screen, though I'm unsure of the exact scale they are using. Have you tried using the vacuum pump to decrease your MAP down to a lower number and see if it improves your fuel rate? Last question...when it was tuned by your tuner did it behave in this manner?

04-07-2014, 11:27 AM	#18
buzzinhalfdozen Senior Member Join Date: Sep 2006 Location: Bellevue Ohio Posts: 984 Likes: 0 Liked 11 Times in 8 Posts	Re: Do these numbers look right? I'm afraid I can't help with the conversion however I do know that on a properly functioning engine (stock) I'll see between 35-40 KPA at idle. With the larger overlaps in the race cams that signal very diminished...which is what you're seeing. Looking at your 2 screen shots you can see when you rev it up the vacuum gets much better and the KPA number goes down, also your pulse width goes lower (less fuel) indicating to me that with the MAP reading it's providing @ idle the ECU "thinks the engine is being loaded, hence the increase in fuel. Have you checked to see what the MAP shows with the engine off? Also it looks like you have a display of vacuum on the screen, though I'm unsure of the exact scale they are using. Have you tried using the vacuum pump to decrease your MAP down to a lower number and see if it improves your fuel rate? Last question...when it was tuned by your tuner did it behave in this manner? __________________ Joe Buchanan SS/BX 3117