Cruez Posted June 5, 2003 Share Posted June 5, 2003 Ok gotta question.. I know about what map sensors are for..Basically they read manifold pressure... but what is the main difference between 1, 2 and three bar sensors..?? besides reading above absolute pressure?? I have a N/A setup that I am running but the map sensor that came with it was for a turbo setup. It is a 3 bar sensor...I know I should have a 1 bar, but will it affect anything by using it? besides overkilll Quote Link to comment Share on other sites More sharing options...
SleeperZ Posted June 5, 2003 Share Posted June 5, 2003 The main difference between the sensors is resolution. Assuming the sensors all have the same full-scale output, say 5V, a 1 Bar will have more output voltage change for a certain pressure change than a 3 Bar. The one bar will effectively sense full vacuum to sea level absolute pressure. The 2 Bar will sense from full vacuum to approximately 15 psi, and the 3 Bar to approximately 30 psi. 1 Bar = 14.7 psi. By using the 3 Bar over the 1 Bar, you will be reading only 1/3 of the full scale, so you may get rougher increments of pressure readable by your fuel computer, and it may not be as smooth in running or tuning. Quote Link to comment Share on other sites More sharing options...
Cruez Posted June 5, 2003 Author Share Posted June 5, 2003 Gotcha... Since the 3 bar has a higher scale.... the portion that I wil be using will have larger increments.... right??? Quote Link to comment Share on other sites More sharing options...
SleeperZ Posted June 5, 2003 Share Posted June 5, 2003 Gotcha... Since the 3 bar has a higher scale.... the portion that I wil be using will have larger increments.... right??? For the 3 bar instead of the 1 bar, smaller voltage increments for the same pressure change, or conversely, the same output voltage change represents a larger pressure change. Quote Link to comment Share on other sites More sharing options...
Cruez Posted June 5, 2003 Author Share Posted June 5, 2003 I wonder If I can find someone to trade... its brand new... Looks like I want the 1 bar, I would rather have more control that it will provide me... Thanks for all the info.. Quote Link to comment Share on other sites More sharing options...
Guest the_dj Posted June 5, 2003 Share Posted June 5, 2003 I might trade. I need a two bar, have a 1 bar. Three would work cause it's cheap and I'm cheap and can go 2 bar later. Ok I'll trade you. When do you have to have it by? Quote Link to comment Share on other sites More sharing options...
Cruez Posted June 5, 2003 Author Share Posted June 5, 2003 My intake should be finished tommorrow. Then I'll have to put it back together again... I still have some brackets and whatnots to make for my new mods. so I figure I'll need one in couple of weeks.. BTW what are the differences in map sensors... connection wise...?? I'll get a pic of mine and post it... Quote Link to comment Share on other sites More sharing options...
Guest the_dj Posted June 5, 2003 Share Posted June 5, 2003 Not sure, I'll try to send a picture of mine as well. I'm not sure when my fabricator/friend of my dad is going to be able to help me make my TT headers, but that's when I'll need it. I hope to have her back on the road in a month. I already have the turbos, so I'm ready to get started but it will clearly take a while to finish a job like this. Quote Link to comment Share on other sites More sharing options...
Guest jt240z Posted June 6, 2003 Share Posted June 6, 2003 The 3 bar MAP sensor would work just fine for your NA engine. Keep in mind that a turbo engine has to run in the NA range too. If you want to trade, then fine. Don't think you HAVE to trade to get your NA engine to work correctly. Quote Link to comment Share on other sites More sharing options...
Guest the_dj Posted June 6, 2003 Share Posted June 6, 2003 Nooooo. I need it and in all honesty, mine is better for his application. Quote Link to comment Share on other sites More sharing options...
Cruez Posted June 7, 2003 Author Share Posted June 7, 2003 Here is the map sensor... http://www.cruez.com/cgi-bin/album.pl?photo=map.jpg Quote Link to comment Share on other sites More sharing options...
Guest the_dj Posted June 7, 2003 Share Posted June 7, 2003 Looks just like mine. I'll ship mine on Monday if you get me an address. Email: djss@mail.utexas.edu Quote Link to comment Share on other sites More sharing options...
TimZ Posted June 22, 2003 Share Posted June 22, 2003 The 3 bar MAP sensor would work just fine for your NA engine. Keep in mind that a turbo engine has to run in the NA range too. If you want to trade, then fine. Don't think you HAVE to trade to get your NA engine to work correctly. If he is never going to tubocharge, then the 1 bar sensor is much better for his application. If you assume an 8bit A/D converter in the EFI system, using a 3bar sensor for N/A is like going from 8 bit resolution (255 discrete steps) to a little more than 6 bit resolution (85 discrete steps). btw, 1 atmosphere = 14.7psi 1 bar = 14.5 psi Quote Link to comment Share on other sites More sharing options...
Cruez Posted July 23, 2003 Author Share Posted July 23, 2003 Did you get my PM.... DJ ? I sould use the map sensor whenever you are ready.... Quote Link to comment Share on other sites More sharing options...
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