I searched for this and found nothing so here goes. With talk of changing tires to a larger size and needing more options there are often a lot of questions about having an accurate speedo. Has anyone tried to calibrate their speedo for a new size tire? I talked to a fellow Mustang nut today who will be recalibrating his speedo due to new wheels. He asked me why I couldn't do the same on a Festy. Thoughts?
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Originally posted by BigWheel View PostI searched for this and found nothing so here goes. With talk of changing tires to a larger size and needing more options there are often a lot of questions about having an accurate speedo. Has anyone tried to calibrate their speedo for a new size tire? I talked to a fellow Mustang nut today who will be recalibrating his speedo due to new wheels. He asked me why I couldn't do the same on a Festy. Thoughts?Jim DeAngelis
kittens give Morbo gas!!
Bright Blue 93 GL (1.6 8v, 5spd) (Hula-Baloo)
Performance Red 94 Aspire SE (Stimpson)
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Originally posted by FB71 View Postdepending on the year Mustang, he's either changing the driven gear on the trans end of the speedo cable, or using a pulse modifier on the trans speed sensor (electronic speedo). Or, if he has a 2005 or newer Stang, he can change the software in the PCM to correct the speedo. The Festiva has a plain old mechanical speedo, but there are no different tooth-count driven gears available for it. That's why we can't correct our speedos.'93 Festiva GL / "HOT ROD"
'02 F-150 Supercrew
'02 Excursion 4x4
'98 Jeep Cherokee Classic Limited
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I just used an online tire calculator and know to compute mileage that way.
I'm running huge tires on my aspire. I'm off 8.9%. when it says I am going 65 I'm speeding by quite a bit. I usually dont drive the car that fast, eats the mpg's.
I thought some speedo shops are able to mount some sort of inline gear reduction unit. Probably upwards of 100 bucks installed. ( just do what i do in other words)1993 GL 5 speed
It's a MazdaFordnKia thing, and you will understand!
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Originally posted by BigWheel View PostHuh??? Sounds like a Flintstone moment :-)
its kinda nice having your godfather as a state trooper....also clocked my golf cart at 43mph88 mustang 427 stroker garrett t-76 turbo best run 8.86@ 151.56
91 red gl festiva the $50 daily driver <--toast
WANTED 78-80 FORD FIESTA (PREF GHIA)
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I upgraded form 12's to 175/70/13 and according to my GPS which is pretty reliable , it says my speedo is on the money against the GPS.
I always thought it was off and I adjusted numbers for mileage , but I was wasting my time.
Jim (FB71), what is that little lever for on the back of the cluster that in front of where the cable attaches to the back , I always thought it was to adjust for minor differences in speedo calibrations.------------------------------------------------
The Trigger - Midwest Festiva Inc., Illinois Chapter
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Originally posted by ohsoslow View Postall i did was remove my speedo needle and turn it till it was correct
with 175/70/13's my GPS said I'm off by about 6 mph. I messed with the adjustment on the back of the cluster a little, and its worse. Now I tend to drive off the tach a little - I know @ 3k in 5th I'm going a little under 80, but my speedo is reading around 70. I just use the rpm to mph calculator I wrote a little while back to know aprox how fast I'm going, and checking it against the GPS, its almost dead on.
Alternatively, I have considered modifying one of those "cluster background" by scaling the cluster readout. With my speedo off by almost 10mph @ 75mph, I should be able to have a speedo that reads correctly up to around 95 - 100 mph. The only reason I haven't is that it seems I change tire sizes every few months, so every few months I would need to swap out cluster backgrounds if I wanted to keep the readout accurate.~Nate
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i set it for 50 mph (i rarely drive it anywhere)
it was 2 mph off at 10 but who cares about 10 mph88 mustang 427 stroker garrett t-76 turbo best run 8.86@ 151.56
91 red gl festiva the $50 daily driver <--toast
WANTED 78-80 FORD FIESTA (PREF GHIA)
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