Got the car possibly needs a retune? - Page 2 - Miata Forumz - Mazda Miata Chat Forums
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NB (1998-2005) NB Miata discussion within. In 1998, Mazda released the second-generation MX-5, production code NB, for the 1999 model year.

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Old 05-03-2012, 07:03 AM   #11
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Originally Posted by eppic View Post
so i have things adjusted to what the factory fm specs suggest. i'll see how that does for fuel and then go from there.
I seem to have gotten that afr gauge a little more steady now.
pick up a megasquirt or other Engine management and you will benefit alot more, im sure better gas mileage is on the list of benefits.
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Old 05-03-2012, 09:43 AM   #12
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just a thought does it have something for fuel management, like a rising rate fuel pressure regulator?
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Old 05-03-2012, 09:44 AM   #13
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not sure how much i could trust that gauge going all over the place like that.


do the injectors look like this:



or





does it drive like *** when the gauge is going crazy like that?
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Old 05-03-2012, 10:24 AM   #14
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i will check injector type again this afternoon when i get back to the car. I'm thinkin its the top one but not 100% sure

the only rising fpr is one of my little pots on the voodoo. i can adjust the pressure curve or something. i was reading a bunch last night but i have a lot of trouble reading and learning. i'm a see how it's done and then i can figure it out from there.
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Old 05-03-2012, 10:38 AM   #15
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If my gauge was going that bonkers in light cruise and the car drove normally (didnt hesistate or stumble) I'd be looking at replacing the WBo2.

If I was seeing 11.1:1 AFRs in light boost with partial throttle, I'd wish i was baller to be able to pay for gas.
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Old 05-03-2012, 01:24 PM   #16
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the guy mentioned the wbo2 might need replacing. are the sensors universal? i have an lc1 but this is an aem. haven't looked at either very close before. maybe someone can inform me so i don't have to crawl under my cars without needing to do so
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Old 05-03-2012, 02:05 PM   #17
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they are the same sensor, but not connectors. you can look up the part number online.


still, youre uber rich obviously when it is working...gotta figure out why. report back on the injectors when you get a chance.
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Old 05-05-2012, 11:20 AM   #18
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ordered a wide band.

injectors are 260's.
after adjusting things on my voodoo box, i'm getting WAAAAY better fuel mileage but now i'm thinkin it's leaning out when i step on it. power just isn't there anymore. new wideband in and i'll be good to go. until then i'll just drive nicely
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