Got the car possibly needs a retune? - 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 05-02-2012, 12:44 PM   #1  
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Default Got the car possibly needs a retune?

alright so this is a 99 miata
engine info that is needed to help me

vortex supercharger
aem eugo (works funny, but possibly because of bad tune)
boost gauge
header and cat back i think. (haven't looked under it yet)

my question is do i need to retune my voodoo box for a different altitude? i bought the car in orland, fl (sea level) and i live in manitoba. (238 metres (780 feet and 10.08 inches above sea level)

it's taking me a full tank of gas to drive 130 miles. boosting maybe once or twice, otherwise all highway.
my afr gauge normally doesn't stay at any consistant number. jumps around alot and sometimes is just blank. I'm curious if things are just soo rich that it cant read it properly? or maybe the sensor is shot. every know and then it reads a solid number but i have no idea weather to trust those numbers or not.

thoughts?
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Old 05-02-2012, 01:16 PM   #2  
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i dont think there's a way to adjust the voodoo box, but sounds really really really rich for cruise.


afrs should be fairly consistent (14.7) in cruise and the voodoo box shoudlnt even box doing anything outside of boost.

are you able to get a good look a the injectors if you squint really hard? if so, what color are they?

what sort of AFRs are you seeing?
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Old 05-02-2012, 03:05 PM   #3  
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Injectors looked to be a redish color.
Wide band doesnt show a number consostantly. Its litterally ranging from 13-17.9ish
I think the most common reading has been between 12.5-14. Sometimes even sitting around 14.7 sometimes.

Maybe ill take a video for you guys.
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Old 05-02-2012, 03:26 PM   #4  
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17.9 sounds very no bueno.
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Old 05-02-2012, 04:31 PM   #5  
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i would figure out how to recalibrate the sensor and then try again. 17.9 is definitely no bueno
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Old 05-02-2012, 05:36 PM   #6  
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got it to act up a little.
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Old 05-02-2012, 05:42 PM   #7  
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Old 05-02-2012, 06:09 PM   #8  
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yea try to figure out how to recalibrate it, i bet itll fix it a bit.
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Old 05-02-2012, 09:48 PM   #9  
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i'm gonna go try it now. $45 in fuel a day is to much for me
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Old 05-02-2012, 11:05 PM   #10  
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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.
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