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JohnJL's Avatar
 
Join Date: Jan 2005
Location: Toronto, Ontario
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Which MAP sensor?

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
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2007 911 Turbo - Not a toy
1985 911 Cab - Wife's toy
1982 911 3.2 Indiash Rot Track Supercharged track toy
1978 911 3.0 Lichtbau toy "Gretchen"
1971 911 Targa S backroad toy
Old 10-16-2007, 04:46 AM
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David's Avatar
 
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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.
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Old 10-16-2007, 08:02 AM
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DonE's Avatar
 
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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.
Old 10-17-2007, 06:53 PM
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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!
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2007 911 Turbo - Not a toy
1985 911 Cab - Wife's toy
1982 911 3.2 Indiash Rot Track Supercharged track toy
1978 911 3.0 Lichtbau toy "Gretchen"
1971 911 Targa S backroad toy
Old 10-17-2007, 09:01 PM
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Wo ist die Rennstrecke?
 
DonE's Avatar
 
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Someone like Richard Clewett or Geoffrey Ring might know. Your software mfg might even know.
Old 10-18-2007, 04:01 PM
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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.
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Old 10-19-2007, 04:06 AM
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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.
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Old 10-20-2007, 05:43 PM
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Thanks everyone.
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2007 911 Turbo - Not a toy
1985 911 Cab - Wife's toy
1982 911 3.2 Indiash Rot Track Supercharged track toy
1978 911 3.0 Lichtbau toy "Gretchen"
1971 911 Targa S backroad toy
Old 10-20-2007, 07:55 PM
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