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Old 09-18-2010, 11:43 PM   #1
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Default CDM asks another stoopid noob question.

I was out tuning my car today with my awesome det cans that Jeff made me. Anyways, i have my car hauling ***-ish now. I pull over to check stuff out, i cut the car off and turn the ign back on to check my tps. It is fine, but the KPa says 89.5. Is that normal? I am just freaking over something that doesn't matter that much, since i have solid 11.7:1 afr's and no knock, I am sure (fairly). I thought i would ask and make sure it really doesn't matter. I searched MAP calibration and got tired after the 3rd thread mentioning butt sex. Anyways, i thought i would ask whether this matters at all, or it has something to do with the fact i am located in the smog infested cesspool of san antonio. I didn't know whether the map correction showed up in tuner studio. Please enlighten me.
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Old 09-19-2010, 12:06 AM   #2
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If the key is on and the engine is off, probably. It's most likely reading ambient pressure.

To find out for sure, go on the local online weather station and see what the barometric pressure is. Then google an online pressure converter and convert from inches of mercury to kilopascals.

Mine is usually 96-97 KPA just south of Chicago. At least it was when I installed it on a warm humid day at around 650 feet above sea level.

Last edited by lordrigamus; 09-19-2010 at 09:37 AM. Reason: Must have been a cool dry day. I don't remember.
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Old 09-19-2010, 01:06 AM   #3
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29.99 Inches mercury is 101.0062 KPA. 89.5 KPa equals 26.479 Inches Mercury. Hurricane Andrew made landfall at 27.23 in mercury. I use Andrew because i lived in FL at the time and people didn't expect government hand outs 3 years after it hit.
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Old 09-19-2010, 01:21 AM   #4
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Yeah, something's out of wack.

Similar elevation and a few hours from you...no way in hell you should be seeing 89.5kPa with MS powered up and motor not spinning.
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Old 09-19-2010, 01:30 AM   #5
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I wondered if my car had "saved" some vacuum in there so i opened the throttle. Now i realize i am a dumbass because that just isn't possible. I turned off then turned on again, and went back to the same place. I don't know if there is some sort of calibration feature or there is a tropical cyclone brewing in my intake. My chitty autozone boost gauge reads higher 20 hg/in vacuum as supposed to below that on the controller. Also, it reads above on the boost.

Last edited by chicksdigmiatas; 09-19-2010 at 01:41 AM.
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Old 09-19-2010, 09:38 AM   #6
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Could it be a ground issue giving a slightly skewed reading? do you have any grounds that are suspect?
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Old 09-19-2010, 12:19 PM   #7
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I don't think so, i de-suspected ones that were causing a tach problem. I guess that could do it.

Edit, i checked my grounds, nothing. It reads the same cool as it does warm. I found a setting it was coolant related air density.

Last edited by chicksdigmiatas; 09-19-2010 at 04:46 PM.
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Old 09-21-2010, 10:50 PM   #8
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I was down there in july for my brothers basic graduation, looking at the logs I had while there I was at 99-100 when i had started the car but not turned the engine over yet.

Up here at Hill AFB, just north of Salt Lake City, it is 4400 ft above sea level and its ranges from 87-89 kPa before startup.

I would say something is wrong with the map sensor
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Old 09-22-2010, 09:42 AM   #9
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are you reading MAP or BARO?
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Old 10-03-2010, 06:25 PM   #10
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Map I believe. In my stupidism, I am not really sure where to set that. I think I found it on Megatune, but I can't find where to edit your config on TS. Maybe I am stupid. Here is a screenshot of my one on megatune. It is doing the same thing in megatune though.
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