Speedometer Options

[kerosene]

When you get a larget size rim and tire, you have to update your speedometer, how do you exactly do that? would a 4 wheel alligment do it?

[Davesceli]

Don't think an alignment would do it...but the difference is so small i don't think it would make much of a difference. With my 17's its about 1.5 - 2 mph off at 80mph.

[kerosene]

1.5-2 is still 1.5-2 ... how do I get rid of that, I'm sure there is a way my partner in competitions did it before... I'd call him but when my phone took a **** i lost his number

[jesterwr217]

you have to have it recalibrated

[kerosene]

you have to have it recalibrated

thats the question....HOW

[jesterwr217]

you have to have it recalibrated

thats the question....HOW

look in the yellow pages we have a shop that specializes in fixing broken speedometers that can do it locally

[kerosene]

you have to have it recalibrated

thats the question....HOW

look in the yellow pages we have a shop that specializes in fixing broken speedometers that can do it locally

No offense, but thats no help.... I want to get an exact way of doing it

[jesterwr217]

you have to have it recalibrated

thats the question....HOW

look in the yellow pages we have a shop that specializes in fixing broken speedometers that can do it locally

No offense, but thats no help.... I want to get an exact way of doing it

honestly i wouldnt recomend it if you dont know what your doing its not that common knowledge either but good luck!

and what size do you have now and what size do you plan on putting on there

[kerosene]

Meh, common knowledge... I wanna try either way

15" going to 17" on 40's... not a huge difference but i want it correct... as it is right now, its off by abou 5, no idea why..

[jesterwr217]

not sure why its off now but if your going 15 to 17 then you wont have a prob but if you were goin like 15 to 18 then you would have to have it fixed

[kerosene]

well if its gonna be 6-7 off...i dont want it.... i need it fixed, and i wanna learn to fix it...gotta be a way to do it

[jesterwr217]

well if its gonna be 6-7 off...i dont want it.... i need it fixed, and i wanna learn to fix it...gotta be a way to do it

what i ment was rim size btw not mph off

[kerosene]

its gonna be off about 2mph i know that, but i want it fixed so i dont have to deal with cops that im going to fast

[Davesceli]

The reason your speedo might be off right now could be that you have either tires that are too tall or too short. Anything that changes the overall diameter of you wheel will affect it. If your speedo is reading 5 miles too fast...your tire diameter is smaller than stock. IF its slower then its too big.

but the easiest way to solve this is to "slow down" a bit...is it that much more difficult to drive at 75mph than 80mph??? Because when you go bigger the speedo will read a bit slower than your actual speed.

Just let off the pedal, and if a cop really wants to pull you over he'll do it. I like it, when i drive with my parents they think im being responsible doin 70-75mph when im really doin 80+!!!

Why go through all the hassle of trying to fix it, when there is a quick fix??

This post has been edited by Davesceli: Oct 22, 2007 - 12:02 AM

[k-weaver]

After I installed my reverse gauges, my speedo was way off. My RPM was still accurate though. I found one of those radars that says "your speed is" and used that. I took the needle off my speedo and put the car on cruise control. The radar said 60, so I put my needle back on pointing at the 60. Ever since then I have not had a problem...

[kerosene]

The reason your speedo might be off right now could be that you have either tires that are too tall or too short. Anything that changes the overall diameter of you wheel will affect it. If your speedo is reading 5 miles too fast...your tire diameter is smaller than stock. IF its slower then its too big.

but the easiest way to solve this is to "slow down" a bit...is it that much more difficult to drive at 75mph than 80mph??? Because when you go bigger the speedo will read a bit slower than your actual speed.

Just let off the pedal, and if a cop really wants to pull you over he'll do it. I like it, when i drive with my parents they think im being responsible doin 70-75mph when im really doin 80+!!!

Why go through all the hassle of trying to fix it, when there is a quick fix??

75mph speedlimit, **** if that was like that here i wouldnt have to speed... highway is 55... most roads are 35-45.... and cops up the ying yang....

[Kwanza26]

There are two main types of speed sensors. mechanical, and digital. The mechanical ones are turned by a toothed gear, which literally turns the speedo. The digital ones (like the 6th gen celicas) use a magnetic pickup to calculate analog movement to digital signals which then is calculated to actual speed by the ecu. Basically, the ONLY way to re-calibrate you speedo is to alter the digital output, ie: change the sensor, or alter the way the computer computes speed, ie: alter the computer.

Either way, speedos and the very nature of converting physical movement to digital calculations is NEVER accurate, so things will never be perfect. Not something you need to worry about, IMO.

[njccmd2002]

http://www.miata.net/garage/tirecalc.html



only a 2 mile difference...

best ones are :



This post has been edited by njccmd2002: Oct 25, 2007 - 8:15 PM