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Freelog and motorola 2.5 bar map sensors

Old 08-30-2007, 10:07 AM
  #1  
0.5 BAR
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Default Freelog and motorola 2.5 bar map sensors

What am I missing or do I need to do make these two work right?

Using Xeno's crome V 1.2.5.25
Map scalars and rpm scalars in freelog match the scalars on my crome bin and crome is set to 2.5 bar.
freelog V 1.0.87

When data logging with freelog everything works right and it even highlights the right cells that im in ( I saw the cells before the 2.5 bar install, for example idle so I know it's in the right spot) but the value it's gving me for the map sensor vacuum is wrong.It's usually at about -29-28 inHg which doesn't seem right.I would search on pgmfi.org but it looks like the forum is down at the moment.

edit:the pgmfi forums back up so im going to see what I can find there,but if anyone has any tips chime in.
92turbohatch is offline  
Old 08-30-2007, 07:06 PM
  #2  
0.5 BAR
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Default Re: Freelog and motorola 2.5 bar map sensors

Got it figured out for the most part.
92turbohatch is offline  
Old 09-06-2007, 03:52 AM
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Default Re: Freelog and motorola 2.5 bar map sensors

whatd you do to fix it?
SmellySOHC is offline  
Old 09-06-2007, 05:10 AM
  #4  
0.5 BAR
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Default Re: Freelog and motorola 2.5 bar map sensors

There are two ways.

One requires You be able to do some algebra and download this ------sheet
http://forum.pgmfi.org/viewtopic.php...er=asc&start=0

Then if your running .87 there's a pretty easy way.

start the car up with the engine off and connect.Write down the number it gives you for the map sensor signal.(Example mine was 91)

start the car up and using a vaccum gauge that's tapped close to the actual map sensor write down the vaccum reading and what free log says for the map sensor reading .(Example lets say -21.5 and freelog says 17 for map)

Open up the slope calculator under settings

Then type it in as so

ecu value =91 output=0
ecu value=17 output -21.5
(these numbers are examples)

Freelog from there will give you the slope.Go to settings,under map convert it to slope and type in what it gives you. The first number the calculator gives you is multiplier the second is base.You might need to tweak the base slightly but evenually I got the reading pretty close to the gauge and it matched the map tracing in free log so it's good enough.When doing it this way use an external vaccum gauge since you can mount it pretty close to the map sensor.Otherwise it's going to be off and you will have to tweak it.
92turbohatch is offline  
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