Cobalt map sensor
09-10-2009, 12:33 AM
#12
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I think you'll be fine with the 2 bar sensor. When I upgraded from a standard MAP, I told Rick @ Synergy that I planned on running 17-18 lbs down the road. He said stick with a 2-bar for the higher resolution for 95% of your driving and he can still tune it for the 18 lbs.
Rick
Ps: By the way, I'm running SD tune.
09-10-2009, 05:35 AM
#13
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3 Bar. You will not find a direct replacement AFAIK. You will need an aftermarket sensor reading 0 - 5 volts and run a vac line to it from the intake manifold and then wire it up to the wires that go to your stock sensor.
2 bar - up to 14.5 psi boost.
3 bar - up to 29 psi boost
2 bar - up to 14.5 psi boost.
3 bar - up to 29 psi boost
So my keen deductive reasoning skills tell me that the stock MAP, 1 bar I presume, will read to about 7.25lbs of boost? :nunchuk1:
So I guess at 7lbs, there would be no advantage to going with a 2 bar, right?
09-10-2009, 03:46 PM
#16
some computers/OS's can do high resolution 3 bar. problem with that high boost on 2bar is the fueling is now going of what ever the bottom line of the ve was. so if you go down to say 17psi your fueling will be off. by going with the proper sensor for the amount of boost you want you get more acurate fueling. i do however, agree that the better resolution is the best way to go.
09-10-2009, 07:06 PM
#18
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I was talking about the boost reading on top of atmosphere that the sensors are capable of :
1 bar sensor can read to atmosphere ( actually a little less because 1 bar = 14.5 psi but atmosphere at sea level ~ 14.7 psi). The sensor in my truck reads 101 to 102 kPa with the key on engine off and I am close to sea level.
2 Bar sensor can read atmosphere plus 14.5 psi boost
3 bar sensor can read atmosphere plus 29 psi boost
K
09-11-2009, 06:22 AM
#20
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It is a little confusing, having to read to atmospheric pressure before reading boost and thus the intake is in vacuum until it reaches atmospheric pressure. It is even more so when you go up in altitude because atmospheric pressure decreases the higher you go. It also varies day to day as high and low pressure zones pass over, which can have a major impact on local weather conditions as well as fuel requirements.
It takes more boost to make the same HP as you go up in altitude because the air is less dense and has less oxygen molecules in the same volume.
It takes more boost to make the same HP as you go up in altitude because the air is less dense and has less oxygen molecules in the same volume.