hey when adding the boost option in crome pro, if you look at the setting for the map sensor, its lower(vacuum) default setting says -49mbar ( for factory or any other option listed). that converts to about -1.5 inhg. so this effect how the car runs. Example, idling at that range based on my map settings, so when data logging it is in the 1.5-2 ish inHg. under normal driving conditions/load it still never see's any more vacuum than that and therefore stays stupid rich. the only way to change this for me has been to use the custom MAP set up option. so I change it to -1002mbar, that converts to -29.6inHg. but then I do this the car just dies. so it seems when it finally runs off the normal idle it is not nearly enough fuel to keep it running. any suggestions? anyone else see this before?

my setup:
B16 low comp pistons, rods, crank
garret gt2860rs
dsm 450cc inj @ 29-31 pounds (stock pressure from everthing I know)
crome pro

 

you're thinking all backwards. those settings you see are simply to scale the voltages properly.
there is no such thing as -1002mbar, so by doing that you're screwing everything up.

0mbar = full vacuum. 1000mbar = ambient pressure. 2000mbar = 14.7psi of boost. 3000mbar = 29.4psi of boost.

 

that may be true but why is it that if it stays at -49millibars it only reads 1.5 to 2 inHg of vaccum which is the exact conversion. but when I change the settings it reads all the way down to 25inHg of vaccum. mbar and inHg are only a form of measuring pressure, but can both vacuum or boost, vacuum being neg. boost being pos.

I may be completely wrong and that's fine, im just trying to figure out why at idle or any other non boost situation it tracks in the proper RPM range but not vacuum. and changing this parameter does directly effect how much vacuum it reads while data logging.

 

do you knew why this would be happening, or what could help.

I had this set up in my my old 1st gen CRX but it was running obd0 and an zdyne gold ecu. it was turbo'd for 7 years and but I got a eg6 and swapped it all over. I had tuned it while obd0 never had any problems when this was in the CRX, and am somewhat new obd1 but not to tuning and obd0.

 

when it comes to map sensors, there is no such thing as negative pressure; all pressure is positive in regards to how a map sensor reads. the -49mbar doesn't even exist, it's physically impossible because that pressure is lower than absolute zero, aka full vacuum. the -49mbar is simply a scalar to properly assign a linear voltage/signal reading.
0mbar would be roughly equivilant to 30 in/hg of vacuum.
923mbar = 2.65 in/hg of vacuum
865mbar = 4.36 in/hg of vacuum
1035mbar = 0.3psi of boost