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· Registered
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Discussion Starter · #1 ·
Hi

Can some one remind me what value I need to minus off the MAP (Manifold Air Pressure) figure to get the value of the boost that I'm running :thumbsup:

Cheers

Mike
 

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178 Posts
Mike,

If you have the latesr version software you can set the datalogging up to read "psi so you will not need to minus the 14.7psi. give me a call tomorrow, we will have a little chat.

Pete
 

· Sold My baby!! :(
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Whoa, what the hell is wrong with my car? I hit one hundred something KPA when I drove my car with my laptop hooked up. What does this tell me? There is no way I am hitting 14 PSI!!! I need to change the settings to PSI and go take my car out again.
 

· ECU Tuner
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3,588 Posts
jsfwds2k said:
Whoa, what the hell is wrong with my car? I hit one hundred something KPA when I drove my car with my laptop hooked up. What does this tell me? There is no way I am hitting 14 PSI!!! I need to change the settings to PSI and go take my car out again.
Nothing wrong. It's just that it can get a bit confusing with the units. The tables allow you to have different units for vacuum and boost, so the non-boost columns 1-9 get up to 98 kPA, but the boost columns 11-13 usually show psi and the default is to show psi on top of atmospheric pressure. That's because when we think of 7 pounds of boost, that's on top of atmospheric pressure. Else, that 7 psi would be 21.7 psi.

Anyway, unlike the tables, the Sensors window displays MAP always in the same unit, so it may show 138 kPA when you're under boost. In order to show the familiar way we measure boost, change the unit for MAP in the Sensor Setup to "/psi. It will then show boost the way you're used to.
 
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