having problems on hooking up a motorola 2.5 bar map... I have signal to pin 1, ground to pin 2 and power to pin 3. Car runs like no map w/ uberdata (won't turn on) and won't rev w/ chrome (but idles fine). Checked with voltmeter and I have .4v w/ car @ 20in vac and .17v @ 0vac (engine off). I would think that there would be more voltage at 0vac then 20in vac. Any help appreciated...

 

you sure the sensor is an absolute pressure sensor? If it's not, it'll only read right with pressure over atmospheric. If it's guage pressure, then that's only 0 and up. Where did you get the sensor from?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tony1 &raquo;</TD></TR><TR><TD CLASS="quote">you sure the sensor is an absolute pressure sensor? If it's not, it'll only read right with pressure over atmospheric. If it's guage pressure, then that's only 0 and up. Where did you get the sensor from?</TD></TR></TABLE>

pretty sure its the right sensor... got from digikey w/ part number from pgmfi wiki : #MPX4250AP

 

hmm, i've never used those so I can't really help any more. Why not just go with a gm 3 bar map?

 

2.5bar recommended by a lot over 3bar quality/tuning wise and also their only $15-20

 

hooked up a spare 2bar gm map sensor and it worked perfect... wtf? anybody... i don't think it's the sensor because I have 2 of them and they both do the same...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">Connect Pin 1 (Vout) to the ‘Reference’ signal in your stock MAP sensor wiring.
Connect Pin 2 (GND) to the Ground wire in your stock MAP sensor wiring.
Connect Pin 3 (Vs) to the 5v signal wire in your stock MAP sensor wiring.
</TD></TR></TABLE>

Looks like you have it hooked up correctly...nothing else is hooked up? I notice in Crome when I did mine up it was noticeably leaner at first startup and needed to be tuned a little richer even with the same MAP scalars.

You sure you are using PIN 1 (with the notch in it) correctly?

 

yeah... i had to blip it to even get it to rev up... so i finally got pissed after four hours and just went with a 2 bar i had. Does anyone know if it's possible to burn these things out??? I hooked it up wrong at first, so maybe thats it...

 

check pgmfi
i already posted there

 

You probably didn't use pin 1. If you look at it what appears to be the back side, pin one is on the left and has a notch in it. FWIW if you aren't planning on running more than 22 PSI, the Motorola 2.5 bar is the way to go!

 

Yeah, it was pin one... I damn near have the manufacturer/data sheet memorized... it said pin one was the one with the notch. Really weird cus i talked to a lot of people and they all said theirs was hooked up like mines. I pluged a gm2bar in and it worked right away. I have a 1bar wastegate also, so I guess the GM Map sensor will do...

Has anyone ever blown one of these out hooking it up wrong, or got a defective one???

 

I've used probably 20 of them and never had a bad one...maybe you got the 1st?

 

i got mine for free from an un-nameable source

i haven't even tried wiring it up yet.
I'm going to build a case for it so i can mount it in the engine bay and not have to worry about it breaking. I'll also graft a stock honda plug on it somehow.

 

I am using a 4-pin header for my plug, and then using pins from an old wiring harness to plug it into the map plug.

 

I cut up an old MAP sensor for the plug, and soldered a shrinkwrapped a short pigtail to the MAP sensor. Then I encased it in hot glue and put it in a tiny plastic enclosure and mounted it to eh firewall behind the IM so the vac line stays as short as possible.

 

I just soldered the wires right to it with plans of heatshrinking over...

 

where can i get one of these 2.5 bar sensors besides digikey?

anyone willing to sell one?

 

here ya go..
http://www.arrownac.com/aws/pg_webc?s=P

 

be careful which part number you get... i checked arrow too but they didn't have the ones w/. the vacuum port...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by non-VTEC &raquo;</TD></TR><TR><TD CLASS="quote">where can i get one of these 2.5 bar sensors besides digikey?

anyone willing to sell one? </TD></TR></TABLE>

I have a few in possession right now. I have been toying with selling them on my site but they are so readily available at Digikey...I unno. Seems easy to use them for local guys only.

if you need one, let me know.