Which MAP sensor?

[JohnJL]

Sorry for the silly question, Im placing my order for the bits i need for the project. It will be a supercharged unit with .9 to 1.2 BAR max.

Question is do I need a 2-BAR sensor or a 3-BAR sensor? Is the 1-BAR of atmospheric pressure already counted or not?

thanks

[David]

They are absolute pressure so a 3 bar will cover up to 2 bar. Even if you didn't plan to go over 1 bar boost, it's still a good idea to get a 3 bar sensor so you can still provide fuel in case of an overboost situation.

[DonE]

To add to David's comments, make sure the software can handle what you're looking for. For example, some systems allow you to set the parameters, and other only accept a specific sensor. Mine allows both.

[JohnJL]

Thanks guys. The software (Adaptronic) works over any range and reference voltage I want to set. I know what range the sensor needs to operate over but not how the manufacturer/retailer describes it!

[DonE]

Someone like Richard Clewett or Geoffrey Ring might know. Your software mfg might even know.

[David]

I'm by no means an expert on this even though I've spent a gazillion hours on my EFI system, but I believe if it's a 5 volt sensor the range for 0 to 300 kPa (or 100 or 200 kPa) would be 0.1 to 4.9 volts.

[930gt-40r]

3 bar GM Map sensor- I believe that the Grand national used a 3 bar in case you want to shoot over to Chevy. Otherwise any EFI retailer on the web will (should) have one in stock. Another option is to use AEM's new 3 bar map sensor, it plugs into the manifold via 1/8 NPT and negates the use of a vacuum line.... just some usefull/useless info.

[JohnJL]

Thanks everyone.