3-Bar map sensor?
#1
Big Snail
Thread Starter
3-Bar map sensor?
I got another question. When running the Power FC when do you need to get the 3-bar map sensor? You need it when you run over 15 psi right? I gonna be running the Greddy profec B spec II with the PFC. I plan on running around 18 psi high and about 14psi low. Where can I get this 3 bar map sensor for a good price and how does it wire in to the FD? As everyone can tell I'm new to this PFC deal. Thanks...Tony
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It's not plug and play.
You need to goto to OPTION 2, set scale to 41800, and offset to 0. The wiring is:
GM 3bar | Function | Rx7 Factory Wiring
A | GRND | Black/Grey
B | MAP SENSOR VOLTS | Greeen/Yellow
C | 5V | Brown/White
You need to goto to OPTION 2, set scale to 41800, and offset to 0. The wiring is:
GM 3bar | Function | Rx7 Factory Wiring
A | GRND | Black/Grey
B | MAP SENSOR VOLTS | Greeen/Yellow
C | 5V | Brown/White
#6
Big Snail
Thread Starter
R-magic....thanks for the help. So I will need to get this GM map sensor if I run more then 14 psi correct? Also where can I pick up one of these GM map sensors? GM dealer :-)
#7
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Originally posted by R-magic
It's not plug and play.
You need to goto to OPTION 2, set scale to 41800, and offset to 0. The wiring is:
GM 3bar | Function | Rx7 Factory Wiring
A | GRND | Black/Grey
B | MAP SENSOR VOLTS | Greeen/Yellow
C | 5V | Brown/White
It's not plug and play.
You need to goto to OPTION 2, set scale to 41800, and offset to 0. The wiring is:
GM 3bar | Function | Rx7 Factory Wiring
A | GRND | Black/Grey
B | MAP SENSOR VOLTS | Greeen/Yellow
C | 5V | Brown/White
Thanks for clearing that up.
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#8
Need more sleep
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You can run up to 17 or 18 psi boost with the stock map sensor ... but if you overboost there is no way to compensate with more fuel or conservative timing. You will get whatever you program at 17/18 psi. Assume you overboost to 20+, you will be lean compared to 17/18 psi boost.
#9
SEMI-PRO
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My stock 2 bar map sensor would not read above 16.8 psi. And i have a few junk motors to prove it! Also have the car tuned for the higher levels with race gas only. Anything above 15-16 psi for pump gas. At least not unless you run some real conservative timing and maybe water injection.
#10
Hooray For Boobies!!!
Originally posted by R-magic
It's not plug and play.
You need to goto to OPTION 2, set scale to 41800, and offset to 0. The wiring is:
GM 3bar | Function | Rx7 Factory Wiring
A | GRND | Black/Grey
B | MAP SENSOR VOLTS | Greeen/Yellow
C | 5V | Brown/White
It's not plug and play.
You need to goto to OPTION 2, set scale to 41800, and offset to 0. The wiring is:
GM 3bar | Function | Rx7 Factory Wiring
A | GRND | Black/Grey
B | MAP SENSOR VOLTS | Greeen/Yellow
C | 5V | Brown/White
Thanks
#13
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Originally posted by twokrx7
You can run up to 17 or 18 psi boost with the stock map sensor ... but if you overboost there is no way to compensate with more fuel or conservative timing. You will get whatever you program at 17/18 psi. Assume you overboost to 20+, you will be lean compared to 17/18 psi boost.
You can run up to 17 or 18 psi boost with the stock map sensor ... but if you overboost there is no way to compensate with more fuel or conservative timing. You will get whatever you program at 17/18 psi. Assume you overboost to 20+, you will be lean compared to 17/18 psi boost.
#15
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Hmmm - here's what I did for Apexi 3-bar
Well, I'm unsure about the GM 3 bar, because I ordered the Apexi 3 bar sensor only out of the Apexi boost kit. Swaped it with the stock one no problem. Changed to Option 1 on the PFC, but needed to use the datalogit to adjust the offset a bit to zero out boost with the car off. Stock setting is 43860 scale, 3289 offset. I used the same scale but and offset of 2820. Boosting to 15 lbs on a t04s very nicely right now, and have very briefly (as I adjusted boost settings with my controller) got it up to 18 lbs (very, very, very short burst) and it accurately reflected 1.29 on the 3-bar.
The nice thing about the Apexi unit is no hacking of the harness - it plugs in just like the 2 bar.
Beast
The nice thing about the Apexi unit is no hacking of the harness - it plugs in just like the 2 bar.
Beast
#19
Hey, where did my $$$ go?
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I've got the GM 3 bar sitting in my garage, does anyone know how to hook this up? I see where R Magic posted the wire conversion BUT what do I splice it to? The map sensore just has holes where a plug would clip in. The stock plug doesnt work so I'll have to cut it off. What do I splice on in its place to plug into the GM sensor???
Anyway know?
Thanks,
STEPHEN
Anyway know?
Thanks,
STEPHEN
#20
in slow, out fast!
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DId you guys see this one at rx7.com? what do you think about it? and does it work the same as a gm sensor or as a boost kit from the pfc
http://www.rx7.com/store/rx7/fdecu.html
MAP (manifold absolute pressure) sensor in a factory 3rd Generation RX-7 cannot see past 17psi. Using a 3 Bar MAP sensor will allow the computer to map engine management strategy up to 29psi. Note: to be used only with A’PEXi PowerFC or Haltech ecus. PowerFC requires special programming, call for details.
3 Bar MAP sensor
Price: $99.00
3 Bar MAP sensor connector and pins
Price: $12.00
http://www.rx7.com/store/rx7/fdecu.html
MAP (manifold absolute pressure) sensor in a factory 3rd Generation RX-7 cannot see past 17psi. Using a 3 Bar MAP sensor will allow the computer to map engine management strategy up to 29psi. Note: to be used only with A’PEXi PowerFC or Haltech ecus. PowerFC requires special programming, call for details.
3 Bar MAP sensor
Price: $99.00
3 Bar MAP sensor connector and pins
Price: $12.00
#21
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That's not the Apexi 3 bar...
I think that's the Haltech 3-bar. I have no idea how to hook it up or what scale/offset to use. Looks like they'll supply the needed info and hardware if you buy it.
The Apexi 3 bar looks exactly like the stock unit - you can't tell the difference unless you look at the parts number.
The Apexi 3 bar looks exactly like the stock unit - you can't tell the difference unless you look at the parts number.
#23
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Looks the same to me....
The component I'm talking about is the black 'tee' looking piece in the upper middle right side of your photo, right above the plastic baggie. The hose nipple attachment is where the vacuum hose plugs in, the two metal rings are where your screws tighten in to the mounting pedestal on the fire wall, and it even has the same three-pin plug for the harness. Plug and play for me.
Now, the boost controller pieces I don't know about. I don't use the boost controller from Apexi - I have the old dial-boost setup that Pettit sold some 5 years ago.
Am I missing something, Steven? Wouldn't be the first time....
Now, the boost controller pieces I don't know about. I don't use the boost controller from Apexi - I have the old dial-boost setup that Pettit sold some 5 years ago.
Am I missing something, Steven? Wouldn't be the first time....
#24
Tony Stewart Killer.
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Originally posted by SPOautos
I've got the GM 3 bar sitting in my garage, does anyone know how to hook this up? I see where R Magic posted the wire conversion BUT what do I splice it to? The map sensore just has holes where a plug would clip in. The stock plug doesnt work so I'll have to cut it off. What do I splice on in its place to plug into the GM sensor???
Anyway know?
Thanks,
STEPHEN
I've got the GM 3 bar sitting in my garage, does anyone know how to hook this up? I see where R Magic posted the wire conversion BUT what do I splice it to? The map sensore just has holes where a plug would clip in. The stock plug doesnt work so I'll have to cut it off. What do I splice on in its place to plug into the GM sensor???
Anyway know?
Thanks,
STEPHEN
steve is it the new or old # 3 bar sensor? its a good idea to buy the connector that goes with it but if you have the old sensor only its gonna be hard to find the old connector. Garfinkle told me he used a 3 wire weather pack instead of the connector which if you have the old sensor is a great idea. Then you just want to cut off the stock connector and splice those 3 wires with the wires that come out of the connector A B C on the sensor. Simple but it still took me about 3 hours to mount the sensor and wire/solder it and insulate it like factory. pretty cool mod for safety IMO...and for the soldering go pick up some Flux, you shouldnt do anything without it.
Last edited by Snook; 04-13-04 at 09:17 PM.
#25
Yellow Dragon is no more
Yes we are talking about the same 3 bar MAP sensor in the photo. Every stock sensor I have seen is mounted to a metal bracket that attaches to the firewall with a M6 bolt. It does not have the side mounting wings like the 3 bar sensor. The electrical side is definately plug and play.