Nissan 370Z Forum - View Single Post

1slow370 · 11-30-2010, 02:40 AM

ok a few things need to be straightened out here, i looked up the manufactures website for info and it reads information through the OBD2 connector, for boost on our cars you are going to need to buy the "boost sensor"(what they call it, not me) and hook that up to the manifold.

Next, Map sensors are manifold ABSOLUTE pressure sensors, meaning they read and are rated from vacuum. a 1 bar reads up to 15psi absolute meaning a hair over atmospheric(this is the factory unit on the 370), a 2 bar reads up to about 15-16 psi boost making this the most common aftermarket sensor, a 3 bar reads to something over 30, and the hardly ever used 4bar is for bullitt because it will go up to like 46, all the map sensors i've ever bought have been rated like this. read the spec sheet on any ecu or ignition box with a built in sensor they usually say 2bar maximum 15psi

Oh and Jmac88 is right about the software they take the MAF reading and the rpm and back convert using the displacement and VE to calculate estimated boost of course if your VE is off or the particular program doesn't account for it it can be way off.

11-30-2010, 02:40 AM	#10 (permalink)
1slow370 A True Z Fanatic Join Date: Aug 2009 Location: In the D Posts: 3,732 Drives: v8 74 260z ;) Rep Power: 7250	ok a few things need to be straightened out here, i looked up the manufactures website for info and it reads information through the OBD2 connector, for boost on our cars you are going to need to buy the "boost sensor"(what they call it, not me) and hook that up to the manifold. Next, Map sensors are manifold ABSOLUTE pressure sensors, meaning they read and are rated from vacuum. a 1 bar reads up to 15psi absolute meaning a hair over atmospheric(this is the factory unit on the 370), a 2 bar reads up to about 15-16 psi boost making this the most common aftermarket sensor, a 3 bar reads to something over 30, and the hardly ever used 4bar is for bullitt because it will go up to like 46, all the map sensors i've ever bought have been rated like this. read the spec sheet on any ecu or ignition box with a built in sensor they usually say 2bar maximum 15psi Oh and Jmac88 is right about the software they take the MAF reading and the rpm and back convert using the displacement and VE to calculate estimated boost of course if your VE is off or the particular program doesn't account for it it can be way off. __________________ ANSWER PRICE LIST Answers - - - - - - - - - - - - - - - - $0.75 Answers (requiring thought) - - - - $1.25 Answers (correct) - - - - - - - - - - $12.50 Last edited by 1slow370; 11-30-2010 at 02:44 AM.