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Performance Modifications for the NG900 / Old 9-3 This forum contains PERFORMANCE related Q&A's for the NG900 and 9-3. This may also include suspension.

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Old 12-27-2011, 10:30 AM   #1
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I've done my fair share of bandwidth hogging here and as such many of you know my challenges in tuning my car.
I've got it running well now, but for some reason there is a discrepancy between the boost gauge and the computer system(s).
Boost gauge reads 15 psi, ECU and laptop both are recording 1.55 bar~ at which point I hit fuel cut and wince thinking I've put a piston thru the block.
Which one is correct? Is the MAP sensor fried and thus leading the ECU to believe the pressure is higher than it is, or is the boost gauge falling victim to being contrived by glowshift?
Car sat for 5 mo's, but before that the boost gauge was dead accurate...
Thanks,
-Cm
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Old 12-27-2011, 06:36 PM   #2
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Guess I either asked a very stupid question or you're just as stumped as I am...are there any other tests to eliminate what isn't the culprit?
-Cm
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Old 12-27-2011, 06:54 PM   #3
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I went through this for over a year. Made no sense when it maxed out at 1.55bar on T5suite. Never once suspected the boost gauge until I stuck two other ones on there and it told me I was running 35psi when my original one said 20.

If you wanna test it before getting another one and you have a bike pump, that's your answer. Pump your boost gauge up to a known pressure using a bike pump that has a gauge on it and that will tell you everything. I couldn't believe that what I was chasing the whole time in the tune or map sensor ended up being my damn boost gauge.
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Old 12-28-2011, 12:23 PM   #4
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I figured as much, but the fact that is suddenly went out is weird to me...
I'll check into it, though I don't have a bike pump with a gauge on it
Basically what you're saying is that T5 suite is fairly reliable...no?
-Cm
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Old 12-28-2011, 12:35 PM   #5
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You will also find quite a bit of tolerance in tire pressure gauges.

A few times a year we usually calibrate all the dyno pressure channels and various gauges in the shop. The tire gauges tend to be the worst offenders.

This is why Saab as a required factory tool had those large 1ft diameter calibrated boost gauges.
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Old 12-28-2011, 08:52 PM   #6
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There is a 30% consistent error between the ECU and the gauge...
Bummer about the gauge, maybe I'll go 3bar pressure sensor early just to peg the stupid thing
-Cm
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