What does your MAP sensor read 2002

Turbonetics TQ

Turbonetics TQ

Turbonetics Turbochargers
Looking to see what your Map sensor reads on a stock 2002 VP truck if anyone has that information.
-No boost foolers.
-No tunes.
-ECM reflashed to verify no unknown software.
-New MAP sensor

I have checked with multiple scanners and everything reads 55 inHg with truck not running.
Current barometric pressure: 24.5 inHg. So according to the truck it’s showing 30.5 inHg of pressure above atmospheric (if I am reading/understanding correctly)
This is showing 14.9 PSIG without truck running.
 
My math brain is weak. Just when I think I grasp it, I revert back to...wait..what ?

I believe your Manifold Air Pressure sensor is calibrated/zeroed to 14.7ish PSI. So, the 30.5 inches of mercury is added by default..?
 
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Got a snap on scanner on it and it shows 12psia no load (which is the atmospheric pressure).
Max boost on the snap on scanner: 33 psia
So 33 Psia- 12 psi = 21 psig (Isspro gauge is showing 20)
So I think I was chasing some that was not there. It was just showing up with the cheaper scan tools.
The truck is an 02’ with a 6 speed and is horribly slow, like drop it in to 4th gear if there is a head wind.
-All the regular VP issues have been checked off ie: fuel pressure, codes, Inj pump is new ish. Air tested for boost leaks. Absolutely no smoke and the pyrometer will top out at 800°F pre turbo.

Have found a random issue while troubleshooting that will be explored: unplugging the oil pressure sensor does not change the oil pressure. Plugged in or not it will show around 40 psi on the dash.
 
thats a stock truck..my 01 is a terribly slow pig. itll barely get up to passing speed without a good run. itll downshift into passing gear and makes alotta noise but doesnt go much faster..its dangerously slow.....speed isnt one of the stock trucks best features...lol...edge comp or a smarty maybe...275 inj make it a lot better for cheap
 
dieselbeef said:
thats a stock truck..my 01 is a terribly slow pig. itll barely get up to passing speed without a good run. itll downshift into passing gear and makes alotta noise but doesnt go much faster..its dangerously slow.....speed isnt one of the stock trucks best features...lol...edge comp or a smarty maybe...275 inj make it a lot better for cheap
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Are you saying it's like that now, or when it was stock?

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dieselbeef said:
lol...both...my 01 is dangerously slow
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Something wrong with it! Must be why you think it can't tow that camper. Hell, I wouldn't describe my truck like that at all, and it's a slow shifting NV5600 truck. You've got more air and fuel than me even!

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no dude..this is the kids truck...the 01..thstock truck...the 02 the flatbed is the hotrod..maybe thats why it feels so slow..lol..the flatbed runs high 13s now in tow trim
 
dieselbeef said:
no dude..this is the kids truck...the 01..thstock truck...the 02 the flatbed is the hotrod..maybe thats why it feels so slow..lol..the flatbed runs high 13s now in tow trim
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Build the trans, then add power!

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Have you checked power, supply and ground to see what voltage they are each on at each sensor?



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I never got a chance to finish troubleshooting this truck as the owner sold it before I could get back to looking at it.
 
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