I am going to get one of these so I can turn up the boost, just have a couple of questions regarding it. I will be adding gages the same time as the aftermarket map sensor to monitor things obviously. I was just wondering the mv range of the stock sensor output is it o mv - 5mv? What boost range does it read? I know the accel's range is 0-30 psi with the same mv range. I just would like to beable to run12-15 lbs of boost using my BD reflash and am wondering if that will be possible with the new MAP sensor? The way it is now my truck cuts fuel from overboost around approx 10 psi. Does anyone have the accel Map sensor and the bd reflash in a 97? I am wondering what mv my computer begins to cut fuel right now with the stock map and what pressure of boost will equal that mv with the new accel map sensor? I know no one can answer my question without seing my truck scanned, but would like an educated guess maybe? Thanks a lot for any input.:rolleyes:

The map runs at 0-5 volts.
According to my scanner, the max reading is 15.9 psi.

accel makes a map too? where did you see this at and how much?

I read 1.50v stock on the MAP engine off~14.7psi or 1 bar. When I use my veriable resistor I usually put it on 1.25v-1.15v

they sell the accel map sensor at summitt racing for 53.00. so does anyone know if the accel map sends out a lower voltage at a given psi compared to the stock map sensor? thats the only reason I would want one so that I could turn up the boost without having to get a new pcm reflash. By the way I run the bd reflash and I asked them if I could send it back for credit and they told me no as they pay someone else for the reflashing. I think z industries.

I think that's what it does.

The 3-bar map sensor that's been previously reccommended here, and is sold by Summit for about the same price stated above, is made by MSD.

I guess it stands to reason that Accel would make one too, but hadn't heard of it. Do you have a part number?

What is the difference between the two if any? Are they a direct replacment? Do they trigger any codes?

I think I meant to say MSD as there is no 3 bar accel map sensor. How well does this thing work with the turbo master and a reflash that does not like more than 10lbs of boost without cutting fuel? Would I beable to run more booost with this map sensor?

you should pm bornready6.5. i believe he has one and loves it.

I'm running the 3 bar map sensor with a turbomaster and a #9 PMD resistor(stock was #3). The turbomaster is set to 15 PSI peak. I've had nothing but success with this setup. The truck has great response and I've seen no decrease in fueling, even at higher altitudes. Also, no worries about overboost DIC codes. The reason I went with the 3 bar map over a resistor fix is that the MAP provides an ultimate limit on boost if for some reason the turbomaster were to fail and lock the wastegate closed, the engine would go into limp when the boost hits 30 pounds. Yes, this is very high and can cause engine damage, but probably not instantly and with a boost gauge and pyrometer, you can pretty much stay safe. The stock GM8 probably cant even make that pressure ;)

The other reason I like the map over the resistor is that when the computer takes its key on engine off map reading for baro, the pressure reported seems "low" therefore the engine fuels more, thinking that its at a higher altitude than it is.

Below, I've posted the pressure vs voltage curves of the 2 and 3 bar sensors.

Good luck with your upgrades.

-Daniel

http://hhscott.com/93tmv/images/3BARv2BAR_Map.gif

thanks for the good input! I am using the heath pmd relocation kit which comes with a #7 resistor for the pmd? What exactly does the pmd resistor do? Sorry if its a stupid question I am all new to this and thanks again for the good info.

Is this what you are talking about? I found it at MSDignition and it had the following description:

Manifold Absolute Pressure Sensor<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p>

The pressure inside the intake manifold is an extremely important input to the ECU. This Sensor will respond to changes in manifold pressures and relay the information to the ECU in the form of a voltage signal ranging from about 1 volt to 5 volts. Several different versions are available for normal aspirated and engines with blowers.

<o:p></o:p>

MAP Sensor, 1-Bar, <o:p></o:p>

normally aspirated applications <o:p></o:p>

PN 2311<o:p></o:p>

<o:p></o:p>

MAP Sensor, 2-Bar,<o:p></o:p>

for blown or turbo applications up to 20 lbs of boost<o:p></o:p>

PN 2312<o:p></o:p>

Compact Model, PN 23121 <o:p></o:p>

<o:p></o:p>

MAP Sensor, 3-Bar, <o:p></o:p>

for blown or turbo applications up to 30 lbs of boost<o:p></o:p>

PN 2313<o:p></o:p>

Compact Model, PN 23131

yes i believe that is the one if its the 3 bar one.

What exactly does the pmd resistor do? .
No cheating class: the homework assignment was given out in welcome note sticky above; all you got to do is read the assigment :D :rolleyes: ; how it all works can be found in FAQs. specific to this question look here http://dieselplace.com/forum/showthread.php?t=10790&page=1&pp=10 Help is available after reading the assignments ):h if you still need help with the material presented.

We don' t need no edumacation:Insane:

52172...I replied to your PM. Again, sorry I took so long, I was going thru Diesel Place withdrawels sitting on the beach on family vacation. Anyway, go with the map... I dont think you will be sorry. I'm not very technical and cant tell you voltages and ouputs and whatnot and definatly dont know what the crap the graph says that one guy posted, but i do know from trial and error and from with what works and what doesnt....the 3 bar worked for me. Unless my boost gauge is lying, I have 18psi, no codes, no defueling.

My only personal complaint is that I need more fuel. And possibly in the near future...a IC.

I was just looking at the chart above and it looks very close to what I saw on the scanner compared to the gauge with a boost fooler turned up as high as it could go without a code. (with an original GM map)
It would be much better if it would be possible to get the curves to cross at 0 psi.