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Old Aug 13, 2009 | 12:29 PM
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Eric
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Joined: Jul 2007
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From: Augsta, GA.
Default Re: Intake Manifold Absolute Pressure

Might I have a boost leak or somthing 16.34psi with all the mods i have seems a lil low

These are the performance mods I have

Inmotion Full Custom Chip Tune (but i beleave this might be part of the problem SRTPowa had the tune for the 178mm ASP pulley/C3 pulley combo and all i have is the 178.. but dont know)
Needswings Custome Pulley Rap Kit
BDJRacing Intake Manifolds
Needswings intake manifold gaskets
Needswings Oil Catch Can (I hear a air suck/leak sound coming from one of the hoses runing to this if i pintch the hose it goes away)
Custome 3" Intake
AEM Dryflo filter
NGK Iridium plugs one step colder then stock, gapped to .30
LET heat exchanger upgrade
Johnson CM30 Liquid Intercooler pump upgrade
1 Gallon Intercooler tank, both moved to the trunk

Originally Posted by ProjectMayhem
in your case 63.2 inhg * .4912= 31.04384 psi but then you must minus your atmospheric pressure which at see level is 14.7 (this number will change with elevation and weather conditions). so 31.04384 minus 14.7 and you get 16.34psi.

To get your exact psi you need to know your actual atmospheric pressure at the time of the datalog which will not always be 14.7 thats just the standard. When you hear drag racers talk about DA they are talking about the corrected altitude or Density Altitude. which has a pretty big effect on how dense your air charge is.
 

Last edited by Eric; Aug 13, 2009 at 12:40 PM.
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