How do I setup a 2 bar sensor on a none custom os pcm. I tried to set the map sensor scaler to 50 but it goes lower to 7kpa at startup. 88 in the map sensor scaler is 100 or 50kpa on the 2bar. Also do I have to set the offset too.

 

To do 2 bar on a standard O/S, don't scale the MAP. Everything has to be built around a BARO of 1/2 the normal atmospheric value, aprox 53 kPa. Baro updating also must be disabled. This is an oversimplification, and there's lots to do. Many tables and parameters have to be changed. Both HPTuners and EFI Live offer 2 bar operating systems for a reasonable upgrade price. It's the simpler solution by far.

 

The only reason I can't do a custom operating system is because this is on a 98 ss. My only question is can i use the scaler value 88 to be at 50kpa with the 2bar sensor and be fine. I know I have to half the ve tables and such. Plus the car idles at 34 with the 2 bar which will eqaute to 68. Normally it idles in the 50 range. Can I shift the scaler or offset so that i can theoretically be idling at 50 kpa or 25kpa logged w/2 bar sensor?

 

It isn't very hard to do IMHO and it worked very well for me. If you search on EFI live you'll find some info. You'll need to do some reading though. You do have to disable the baro update and adjust the tables that use MAP. ie the VE table with the 2bar MAP 50kpa is 25 ect...

 

I started to make a script that would convert the tables... I never got comments on it and don't know that it will help but maybe the tables are of some use for you. It IS NOT a working file but rather a collection of notes....

*click*

Anyway more people should be using scripts.

 

So All I need to do is to get the 2 bar sensor working right, is to get the key on 2 bar reading the same as the 1 bar at key on. So If I have 101 kpa with the 1bar at key on. I need to set the map scaler for the 2 bar to lets say 89 to get the reading of 50kpa with the stock gm map pid.
From what I gather I don't need to mess with the offset at all.