2 Bar Map Sensor
 

Does anyone know where I can get a 2 bar map sensor for a 2000 civic ex. I've been using a missing link but it still breaks the map sensor and I'm only running 8psi.

Re:2 Bar Map Sensor
 

Hondata is the only company I know of that makes 'actual' MAP sensors for above stock bar signal.
I'm not sure if it fits 2000 or not, but worth a check http://www.hondata.com

Re:2 Bar Map Sensor
 

GM 2 or 3 bar map will do ya fine.

Re:2 Bar Map Sensor
 

and u will need a ecu able to reconize that aswell or some other "boxes"

Re:2 Bar Map Sensor
 

I heard this only works with a stand-alone-mg or a piggy-back system.Did I hear wrong?

Re:2 Bar Map Sensor
 

Well the voltage swing is the same on them regardless of who makes it(close enough anyways), ~0v-~5v. So as long as you wire it correctly it doesn't matter if it is a honda map, gm map, ford map....well nm ford.....they suck at everything :)



Mike

Re:2 Bar Map Sensor
 

yup...that's what i heard too.

Jeff-

Re:2 Bar Map Sensor
 

The 2/3 BAR MAP sensors Hondata uses are GM sensors, not their own. You have to have something that understands that you are using a different sensor such as a piggyback system or re-programmed ECU.

Basically you have a voltage range of 0-5 volts. The stock sensor devides the voltage up based on normal atmospheric pressure, and ~3.1 volts throws a code because it should never see over that voltage range normally aspirated. The reason why you can get ~9 PSI outta the stock sensor is because you still have 2 volts left, but you have to program or fool the ECU to see these extra 2 volts. The 2 and 3 BAR sensors still use the same range (0-5 volts) but the increments are bigger to allow for more pressure, so @ 3 volts on a 2 BAR sensor you are already into ~7 PSI. If the ECU doesn't understand that, it thinks you are at 0 PSI and is not providing neither the fuel nor ignition adiquate for that kind of positive pressure.

The piggyback or re-programmed ECU *knows* that 3 volts now means ~7 PSI and accomodates with fuel/timing retard. Make sense?

Mike

Re:2 Bar Map Sensor
 

The stock Honda MAP is scaled to ~11.8 psi at 5 volts, but is physically limited due to construction to either 9.25 or 10.65 psi. GM 2 bar goes to 14.5 psi @ full five volts. The scales aren't that far off, you should be able to tune it with an AFC just fine. I can show you my work if you disagree, Mike, I'd actually like to have someone pick a few holes in it. You definitely have some perspective on the situation.

Tidbit of info for the day; Ford MAPs are frequency based, not voltage - they are incompatible with anything other than more Ford stuff. Furthermore, I LIKE Ford thank you very much ;)

Re:2 Bar Map Sensor
 

does any one have the actual part #s for the gm 2 and 3 bar map sensers?

Beau

Re:2 Bar Map Sensor
 

GM 2 bar:

GM part # 16009886
Wells part # SU-129
standard part # AS-4

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GM 3 bar:

GM part # 16040749


FYI, if you ever have any wierd oddball Q about any EFI component... it's been covered sixteen times already on the DIY-EFI mailing list. Their complete and info-packed mailing list is archived off of www.diy-efi.org. Good shizzle! It's where I just cut/pasted that info from.

Re:2 Bar Map Sensor
 

Hey just curious if with that 2-bar or 3-bar sensors if you can use the AFC still to control fuel curves? I imagine you can, but does this risk getting into CELs again?

Re:2 Bar Map Sensor
 

there's also a 2.5bar sensor manufactured by motorola (MPX4250AP). it's a PCB mount sensor i guess, but it sells for about $20 from digikey et al. i don't know if it can handle the environment of the engine bay, but i'm sure you could put it in an enclosure. this is the sensor that the megasquirt EFI ECU uses. cheap alternative maybe.

most places charge up to $65 for the GM 2 bar sensor. i know autozone online has the wells version for $28.99 (do a search for a 89 pont. sunbird turbo).

hope that's useful info...