What to use to tune my NB's speedometer?
#41
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Actually, 185/55R15 is a 23.0 inch nominal diameter, which is slightly taller than the stock 195/50R15, but almost identical to the common aftermarket 205/50R15 or 225/45R15s.
(Totally unrelated, but I'm curious why that size? It seems an odd choice.)
Having the wrong sender explains everything. Used green 4.3 senders are cheap, because pretty much every 5-speed NB came with one and they rarely break. Mazda wants an arm and a leg for a new one.
If you've been running around with a sender that's 10% too low, then your odometer is probably also 10% too low for however long it's been in. Might want to factor that into your service periods and mpg calculations.![](https://www.miataturbo.net/images/smilies/smile.gif)
--Ian
(Totally unrelated, but I'm curious why that size? It seems an odd choice.)
Having the wrong sender explains everything. Used green 4.3 senders are cheap, because pretty much every 5-speed NB came with one and they rarely break. Mazda wants an arm and a leg for a new one.
If you've been running around with a sender that's 10% too low, then your odometer is probably also 10% too low for however long it's been in. Might want to factor that into your service periods and mpg calculations.
![](https://www.miataturbo.net/images/smilies/smile.gif)
--Ian
#44
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My car is a 2001 Sport, so it came with 16" wheels.
The tires I have on are shorter than the 16's that came on it.
Anyway, the solution was that a 3.9 got swapped in my car without me realizing it, making my math way off. Just need a 4.3, as said above.
As far as why the 185's... that's a whole thread (filled with flames) in itself.
The tires I have on are shorter than the 16's that came on it.
Anyway, the solution was that a 3.9 got swapped in my car without me realizing it, making my math way off. Just need a 4.3, as said above.
As far as why the 185's... that's a whole thread (filled with flames) in itself.
#52
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Never trust my memory...found it!
Yellow Box Speedometer Recalibrator 99-05
Rev said it too...yellowbox.
Yellow Box Speedometer Recalibrator 99-05
Rev said it too...yellowbox.
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