So you will have to have the vehicles calibration changed for the new offset.
Gm 3 bar map sensor.
Gm makes a 3 0 boost map sensor that can be made to work with megasquirt.
1 8 npt pressure sensor flexible hose extension kit remote sensor blocks manifolds adjustable pressure switch air pressure map sensors accessories bosch tmap aluminium weld flange 2 bar gm map sensor 2 bar map sensor gen 3 2 5 bar bosch tmap sensor 2 7 bar map sensor 3 bar bosch tmap sensor 3 bar gm map sensor 4 bar bosch tmap sensor.
It is possible that detroit is slightly above sea level and you can use 12 11 in the formula for 1 mile above sea level.
Formula for the gm 3 bar map sensor is v 8 94 14 53 i have no idea why it s 14 53 and not 14 696 rounds up to 14 7 but it works out on gm s chart every time.
This item gm 3 bar map sensor kit custom turbo 3bar 12223861 manifold pressure as210 44psi 3 bar map sensor for various gm models with connector pigtail manifold absolute pressure map sensor 12223861 fits for gm buick gmc chevrolet.
Calibration is linear with 1 1 kpa at 0 volts and 315 5 kpa at 5 volts.
The echlin equivalent 3 bar sensor is pn crb219481.
However it is a 3 bar map sensor.
This sensor can be used up to 29 psi of boost.
The 55573248 is a 1 bar map sensor.
John from ca answered on september 11 2017.
Formula for the gm 3 bar map sensor is v 8 94 14 53 i have no idea why it s 14 53 and not 14 696 rounds up to 14 7 but it works out on gm s chart every time.
Map sensor assembled in the usa unlike the current delphi production.
Description map sensor gm 3 bar manifold absolute pressure sensor standard compatible with the ms3pro and all flavors of the megasquirt ems microsquirt ems.