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Old 06-16-2014, 01:31 PM   #1
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Default 99 Miata MAP Signal Source?

Ok, so I had my MAP signal line for MS right after the TB, and that didn't seem to be the best.

The Flyin' Miata installation instructions say to go from the vacuum line at the back of the IM (near the firewall) and that seems to be a bit better... but I've read over and over on here to tee off the FPR vacuum line. And y'all are pretty smart.

Only thing is, in all my searching, I don't believe the 99 miata HAS an FPR...? I thought I was crazy about this, but I can't find anyone online selling 99 miata FPRs, and the Flyin Miata fuel rail installation says to "remove the FPR (90-97)/Damper (99-05)".

So what is the best place to pull a MAP signal on an NB Miata, and can anyone post a picture of where exactly it is?

I ran the car for 700 miles or so pulling MAP from the back of the IM, but if there's a better option I'd like to know it.

*flamesuit on*
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Old 06-16-2014, 01:33 PM   #2
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(I hope you'll understand why searching for anything to do with "map" is useless, as all I get is a bunch of Fuel and Spark MAPS which isn't waht I'm looking for...)
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Old 06-16-2014, 01:41 PM   #3
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I believe the source on the back of the intake manifold that you're currently using is the best place in your situation.

You have a returnless fuel system, so you have no FPR vacuum source like '90-'97 (another reason NAs are best). You could try t'ing off the brake booster line, as that's right next to where the FPR line is on an NA. You'll need a weird 3/8"(?) to 1/4" T fitting though. I think BEGI uses one for their setups.
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Old 06-16-2014, 01:43 PM   #4
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Thanks for the input. I think I'll leave it where it is now unless I get some erratic readings... I usually got one little "blip" about 3 seconds after starting the car, but then it settled down and all was great.
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