phatyaspen
New member
i need a speedomoter re-calibrator... i need it asap where is the best place 2 find one i am looking and searching franticlly. i just got pulled over for speeding and its sux help me please!!!!
speedometer calibrator
- Thread starter phatyaspen
- Start date
phatyaspen
New member
97 TJ w/ 33" claws
Utah_jeepster
Super Moderator
First some info is needed, since your speedometer is off (we are guessing here) that you have lifted your jeep and put bigger tires on and/or re-geared it. Now I know for a fact on a TJ it is not a cable but an electronic sensor and you have to change a small plastic gear near the out-put shaft for the right tire size and gearing. An easyer way is to look up Automotive repair shops in your area and find a speedometer shop that can re-calibrate it for you. With the reciept in hand you might have a good chance that the judge will dismiss the charges and or reduce the fine since the reciept will say yours was off.
Good luck...if nothing else the weekend drivers ed class to wipe the ticket off is not that boring...NOT!
Good luck...if nothing else the weekend drivers ed class to wipe the ticket off is not that boring...NOT!
TwistedCU
New member
Here's a link that can help you figure out how fast you are going until you get it squared away:
http://www.4lo.com/4LoCalc.htm
FYI: For the purpose of using these tables, the stock jeep tires (215-75-15) translate to 27.696850393700785 inches.
Also check out this previous post:
http://www.jeepz.com/index.php?name=PNphpBB2&file=viewtopic&t=318522&highlight=
I think 4wd hardware sells a module that adjusts your speedometer for the bigger meats. somewhere between $100&$200 It should be in their catalog, check quadratec, too!
http://www.4lo.com/4LoCalc.htm
FYI: For the purpose of using these tables, the stock jeep tires (215-75-15) translate to 27.696850393700785 inches.
Also check out this previous post:
http://www.jeepz.com/index.php?name=PNphpBB2&file=viewtopic&t=318522&highlight=
I think 4wd hardware sells a module that adjusts your speedometer for the bigger meats. somewhere between $100&$200 It should be in their catalog, check quadratec, too!
Mxpx182lit
New member
i had to get a new speedo gear in m yTJ with 33's and 4.56 gears
phatyaspen
New member
hey Mxpx182lit how much did it cost for your new gear?
Mxpx182lit
New member
around 10 as in ten dollars
phatyaspen
New member
easy 2 install? did u do it yourself...
Inspector-Gadget
New member
We are going to moab
Hello phatyaspen,
I had a similar speedo problem when I acquired the "Bubbacon." The Jeep had bigger than stock tires, but at the time I had no idea what the stock tire size might have been. So, I went with a method similar to jackal's, as explained in a previous thread.
I knew the t-5 transmission ratios, the differential ratio, and I measured the actual rolling diameter (not the calculated diameter) of the rear tires. With that information in hand, I dumped the information and a formula into an Excel spreadsheet for calculation.
I then printed and laminated the table and taped it to the driver's sunvisor. Here is a picture of a portion of the spreadsheet:
The table entering arguments are desired MPH and transmission gear. The intersection is the engine RPM. By referring to the chart, I could drive by the tachometer instead of the inaccurate speedo. (Watching the road is for sissies!) Actually, after using the table for a while, I learned by repetition the RPM needed in the various gears for the few commonly encountered speed limits.
A lot of work to avoid buying and installing a new speedo pinion gear? To be sure, but at the time I had bigger and higher priority Jeep-related issues with which to cope.
Of course, after having done all that, I then knew by how many miles-per-hour the speedo was off and could compensate for the speedo reading. But, hey! Computational excess is good!
:mrgreen:
The "Bubbacon" cockpit modded out w/column-mounted TJ or GC tach, RPM-to-MPH visor chart, S-10 map-lighted interior rear view mirror mounted below a Honda-Civic (ricer implant alert!) digital clock.
The table method might yet be useful, however, for those with broken speedos or who frequently swap between differently sized highway and off-road tires.
Tounge-in-cheekly submitted,
:wink:
Gadget
Hello phatyaspen,
I had a similar speedo problem when I acquired the "Bubbacon." The Jeep had bigger than stock tires, but at the time I had no idea what the stock tire size might have been. So, I went with a method similar to jackal's, as explained in a previous thread.
I knew the t-5 transmission ratios, the differential ratio, and I measured the actual rolling diameter (not the calculated diameter) of the rear tires. With that information in hand, I dumped the information and a formula into an Excel spreadsheet for calculation.
I then printed and laminated the table and taped it to the driver's sunvisor. Here is a picture of a portion of the spreadsheet:
The table entering arguments are desired MPH and transmission gear. The intersection is the engine RPM. By referring to the chart, I could drive by the tachometer instead of the inaccurate speedo. (Watching the road is for sissies!) Actually, after using the table for a while, I learned by repetition the RPM needed in the various gears for the few commonly encountered speed limits.
A lot of work to avoid buying and installing a new speedo pinion gear? To be sure, but at the time I had bigger and higher priority Jeep-related issues with which to cope.
Of course, after having done all that, I then knew by how many miles-per-hour the speedo was off and could compensate for the speedo reading. But, hey! Computational excess is good!
:mrgreen:
The "Bubbacon" cockpit modded out w/column-mounted TJ or GC tach, RPM-to-MPH visor chart, S-10 map-lighted interior rear view mirror mounted below a Honda-Civic (ricer implant alert!) digital clock.
The table method might yet be useful, however, for those with broken speedos or who frequently swap between differently sized highway and off-road tires.
Tounge-in-cheekly submitted,
:wink:
Gadget
PASmokeater
New member
look...your best bet and most easy alternative is to go to the dealer...tell them what size tire you have, and they will order you the correct gear around 15 bucks. If you're running 33's (as I am) your speedo is only about 5 mph off at 65, so I would not bother...just slow down a little.
If you want to do it..this should help
http://www.imajeep.com/Speedo_Recal/speedometer_recalibration.htm
Rob 8)
If you want to do it..this should help
http://www.imajeep.com/Speedo_Recal/speedometer_recalibration.htm
Rob 8)
phatyaspen
New member
hey pasmokeater i also have 4.88 gears lol it throws my speedo off by like 30
PASmokeater
New member
well, check out the chart in the link I posted, and get the part # and go to town....it's not a hard project, and the directions are right there for you to follow.
Rob 8)
Rob 8)
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