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irishsetter · Post by **irishsetter** » Wed Oct 05, 2005 7:45 pm

Ok what is the difference between a MAF and a MAP. Which one is right after the intake box. If I am not getting 11 volts output from it is it done or can I clean it or rebiuld it?

wiscon_mark · Post by **wiscon_mark** » Thu Oct 06, 2005 1:24 am

MAF is right after the filter box.

You can clean it, but be VERY careful, as it is delicate.

Subaru_Nation555 · Post by **Subaru_Nation555** » Thu Oct 06, 2005 3:32 am

MAF-mass air flow sensor-measures incoming air
MAP-manifold absolute pressure sensor-measures vacuum (engine load)

I used brake clearner to clean my MAF when I was trying to troubleshoot something. Like wiscon_mark said its delicate.

BAC5.2 · Post by **BAC5.2** » Thu Oct 06, 2005 7:18 pm

MAP sensors don't only measure vacuum. They can measure anything having to do with pressure (or lack thereof) in the manifold.

That's why you can see Skylines or WRX's or whatever with open turbo inlets and no MAF's. They are fueling based on MAP signal compared to a few different things, essentially calculating the Volumetric efficiency of the engine from various sensors and compared to atmopsheric, and it fuels from that.... from what I understand anyways.

It's pretty difficult to set up and properly tune a MAP based fueling system, but it's possible and can be nice for pipe routing. It's not as percise though, so you do take your chances.

Psychoreo · Post by **Psychoreo** » Fri Oct 07, 2005 4:25 pm

speaking of MAF and MAP sensors, are the wires between the two harnesses the same? the plug is the same, just do they go to the same places?

BAC5.2 · Post by **BAC5.2** » Fri Oct 07, 2005 4:28 pm

Lots of plugs are the same. That doesn't mean they go to the same place.

The scan port plug is the same as a radio plug, and the plug for the tail light.

But no, they don't go to the same place. They both go to the ECU, but not to the same pins.

Psychoreo · Post by **Psychoreo** » Fri Oct 07, 2005 4:32 pm

yea, thats what i gathered from the swap wireing thread. not to hijack this thread but , nevermind that would be hijacking i'll ask in another section.

Puprap · Post by **Puprap** » Wed Aug 02, 2006 7:43 pm

Achtung!!

Lowjack · Post by **Lowjack** » Mon Aug 14, 2006 9:00 am

Subaru_Nation555 wrote:I used brake clearner to clean my MAF when I was trying to troubleshoot something. Like wiscon_mark said its delicate.

Try to stay away from brake clean and carb cleaners. They'll actually damage electronic components. Try to get some electronics cleaner from Radio Shack. Much better/safer/smarter

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