Boost #'s don't match with chip.
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Boost #'s don't match with chip.
Recently purchased autoenginuity(AE). When comparing the turbo boost from my pillar gauge and AE, AE was consistenly 4-5#'s less than the pillar guage. Switched my flip chip back to stock setting and AE matched pillar. I am running a 4 pos DP tuner chip (I'm not sure which tunes) but on all three of Jody's tunes boost on AE is 4-5#'s less than pillar gauge. Just thought I would share.
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AE reads the MAP sensor. While towing down the highway with my pillar gauge reading 10#'s AE reads 6#'s. The second I switch back to the stock setting (and I do mean the second) AE jumps from 6#'s to 10#'s. Change back to jody's tunes and AE jumps back to 6#'s. This has stumped me for a while, and I even bought a new MAP sensor that didn't change anything. I'll check the AE version, but I don't think that is the problem. MAP sensor doesn't have a blow-off or regulator. Pillar boost gauge is plumbed after the intercooler.
Looks like Jody would want the boost to read higher so that it would pump more fuel. This is exacly opposite.
Looks like Jody would want the boost to read higher so that it would pump more fuel. This is exacly opposite.
Post Fiend
Joined: Jun 2006
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From: Central, Al
If you are only reading 6# on MAP you are reading -8# of boost since abient is around 14.6 depending on weather.
The MAP is the Baro (abient Pressure) reading + Manifold Guage Pressure (Boost)
he could be lowering the Baro a few PSI but I cant think of why.
The MAP is the Baro (abient Pressure) reading + Manifold Guage Pressure (Boost)
he could be lowering the Baro a few PSI but I cant think of why.
Last edited by Uzumati; Sep 12, 2006 at 09:38 PM.
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In AE you can either read absolute pressure or gauge pressure. I was looking at gauge pressure which would be equivalent to pillar gauge boost pressure.
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Cargo Master
Joined: Jan 2005
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From: Pasadena, Maryland
Originally Posted by schmity
AE reads the MAP sensor. While towing down the highway with my pillar gauge reading 10#'s AE reads 6#'s. The second I switch back to the stock setting (and I do mean the second) AE jumps from 6#'s to 10#'s. Change back to jody's tunes and AE jumps back to 6#'s. This has stumped me for a while, and I even bought a new MAP sensor that didn't change anything. I'll check the AE version, but I don't think that is the problem. MAP sensor doesn't have a blow-off or regulator. Pillar boost gauge is plumbed after the intercooler.
Looks like Jody would want the boost to read higher so that it would pump more fuel. This is exacly opposite.
Looks like Jody would want the boost to read higher so that it would pump more fuel. This is exacly opposite.
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Post Fiend
Joined: Jun 2006
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From: Central, Al
Gauge pressure should match the pillar gauge since you dont have a regulator and even then it would only be different in an overboost situation. My vote would be for Jody lowering the reported value a little. All he has to do to pump more fuel would be to raise the IPR Duty Cycle a little an by lowering the boost the PCM is seeing he is Defueling later.
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All he has to do to pump more fuel would be to raise the IPR Duty Cycle a little an by lowering the boost the PCM is seeing he is Defueling later
Would explain that in a little more detail? Not quite sure what your saying.
Post Fiend
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From: Central, Al
The ICP reads the pressure in the HP oil rail and the PCM decides if more or less fuel is needed due to throttle position and a few other variables. if more oil pressure is needed to provide more fuel the PCM commands the IPR to open more (Increase duty cycle) thus increasing ICP pressure and fuel flow. Now the PCM will begin to defuel at around 25psi of boost so if jody is lowering the boost number the PCM is seeing then you are actually over that 25psi reading when you begin to defuel.
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Originally Posted by amiller93
The ICP reads the pressure in the HP oil rail and the PCM decides if more or less fuel is needed due to throttle position and a few other variables. if more oil pressure is needed to provide more fuel the PCM commands the IPR to open more (Increase duty cycle) thus increasing ICP pressure and fuel flow. Now the PCM will begin to defuel at around 25psi of boost so if jody is lowering the boost number the PCM is seeing then you are actually over that 25psi reading when you begin to defuel.
The only way to "fool" the pcm from seeing boost is with a regulator or something like it in front of the map sensor.
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From: Hoschton,GA
Originally Posted by Vengeance
The only way to "fool" the pcm from seeing boost is with a regulator or something like it in front of the map sensor.
Diane
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From: Hoschton,GA
schmity,
sent you a PM...
sent you a PM...
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