Going to put in my 3 bar map finally. I need to know the pinouts for the MAP plug please.

 

A. 5-volt supply
B. Signal
C. Ground

Just because I drive a Mustang now doesn't mean I've forgotten my roots

 

well, I was going to say that you beat me to it but the info I found is different. I'm pretty sure this is the thread I used before. I can varify when I get home and look at the truck.
https://ls1tech.com/forums/showthrea...ght=map+wiring

 

The info I gave is the pinout data from both Megasquirt and FAST....both use regular GM MAP's (0-3bar) so the info "should" be right, if I'm wrong please let me know !!!

EDIT: it looks like the info given in mj's reference thread is the exact opposite of the info I gave.....I wonder if this is a "semantics" issue or if FAST and Megasquirt have thier info bass-ackwards

EDIT 2: it looks like mj is right.....I was looking at the info for the standard MAP's, the 1-3bar MAP's use:

A: Ground
B: Signal
C: 5-volt supply

 

I read TG's thread. I don't get the whole thing about "vacuum signals" and not teeing off lines, etc. Vac is vac. It doesn't get stronger or weaker, dirty or clean.

So it looks like I need a plug for my 3bar map and then more factory-harness-hacking-fu. Maybe I'll get fancy and make a conversion plug.

 

I think common sense needs to be used on the T issue. If you have a small vacume line that is going to 4 other accessories you could have some delay issues due to the added volume of the line. Air is a compressable/expandable gas so volume & diameter of the line(s) off of the T should be considered.
I spliced, soldered and shrink wrapped my 3 bar plug with the 1 bar. I left the 1 bar plug on there so I could swap back in forth easily if I had any issues, which I did so it came in handy.

 

Vacuum IS vacuum....but any T's or splices in the line add to the chance that you will have a vacuum leak. a MAP sensor really should have a dedicated line to it, expecially if you're relying on it for an SD tune.....

 

I understand vacuum is vacuum but you have to add or remove molecules to change vacuum and if the Map is at the end of a long line and especially a small line it won't see the change in pressure as fast as it is actually occuring in the intake manifold.
You have a qt jar full of pennies(air molecules) and gallon jar full and they have the same size opening, in the end you will end up with 0 pennies, which one will empty all it's pennies faster?

 

I was agreeing with ya mj.....

 

I don't think that's the first time that has happened