MAP timing table with MSD 6010
07-10-2012, 02:11 PM
#1
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MAP timing table with MSD 6010 I've been experimenting with my car with just the rev table. A friend just bought a car with a stock 5.3 with a GM hot cam in it. He didn't get the programming software with it, so I told him I'd do it for him.
Problem is his car has a MAP sensor on it and I don't have a clue what to do.
Help lol
Problem is his car has a MAP sensor on it and I don't have a clue what to do.
Help lol
07-10-2012, 05:02 PM
#2
10 Second Club
I asked same thing and
Originally Posted by Doug G
Sooo.... the numbers on the left in the vertical line are degrees added and the numbers across the top on the horizonal are vacuum inches ?
Sooo.... the numbers on the left in the vertical line are degrees added and the numbers across the top on the horizonal are vacuum inches ?
Posted by S10xGN
NO! You are correct on the vertical axis. The horz is not vacuum as we call it, but pressure (Pounds per Square Inch, Absolute). PSIA starts at 0# PSIA = 29.8" vacuum and goes to 14.7# PSIA = 0" vacuum. There are numerous conversion charts on the 'net...
NO! You are correct on the vertical axis. The horz is not vacuum as we call it, but pressure (Pounds per Square Inch, Absolute). PSIA starts at 0# PSIA = 29.8" vacuum and goes to 14.7# PSIA = 0" vacuum. There are numerous conversion charts on the 'net...
07-10-2012, 05:32 PM
#4
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O = atmospheric pressure
As vacuum goes up....PSIA goes down.
So your max vacuum advance will be on the left and at WOT vacuum is at or near O....your advance will be lowest going towards the right (as it was explained to me).
As vacuum goes up....PSIA goes down.
So your max vacuum advance will be on the left and at WOT vacuum is at or near O....your advance will be lowest going towards the right (as it was explained to me).
Last edited by Doug G; 07-10-2012 at 05:39 PM.
07-10-2012, 07:52 PM
#7
Vacuum is the pressure difference between two areas. The lower the pressure in the manifold, the stronger the vacuum. Not that hard.
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07-11-2012, 07:16 AM
#9
MAP measures manifold absolute pressure, hence the acronym. Put a constant pressure inside the manifold and the MAP sensor will output a constant voltage. Change the outside barometric pressure and the MAP signal will not change, however the vacuum gauge reading will. So if you use 2 MAP sensors and take the difference you can accurately measure vacuum.
And yes, absolute barometric pressure can vary quite a bit with changes in temperature and altitude.
07-11-2012, 08:09 PM
#10
Unfortunately it is more than just a units thing. A vacuum gauge has manifold pressure on one side and atmospheric pressure on the other. It measures the pressure difference between the two.
MAP measures manifold absolute pressure, hence the acronym. Put a constant pressure inside the manifold and the MAP sensor will output a constant voltage. Change the outside barometric pressure and the MAP signal will not change, however the vacuum gauge reading will. So if you use 2 MAP sensors and take the difference you can accurately measure vacuum.
And yes, absolute barometric pressure can vary quite a bit with changes in temperature and altitude.
MAP measures manifold absolute pressure, hence the acronym. Put a constant pressure inside the manifold and the MAP sensor will output a constant voltage. Change the outside barometric pressure and the MAP signal will not change, however the vacuum gauge reading will. So if you use 2 MAP sensors and take the difference you can accurately measure vacuum.
And yes, absolute barometric pressure can vary quite a bit with changes in temperature and altitude.
