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Old April 24th, 2010, 19:20   #11
FlyTDI Guy
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Join Date: Nov 2001
Location: PNW
Fuel Economy: 56.5/44/41
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The voltage range is the same but... they represent different ranges. In other words, with the OEM 1.5 bar might return 3v to the ECU. With the 3 bar map, the same 1.5 bar only returns 2.5v. At idle, your ECU knows ambient, say 1000 mbar. Your map sensor, however, is returning lower than expected and they don't match. Some people can run a 3 bar map and not have any bad symptoms, most need to update the maps in their ECU to truly make it work right. Short answer, if you're going to run a 3 bar map, you need to tune for it. That means re-mapping the ECU.
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