speedo recalibration?

crunchy · November 19, 2004

I just put 35s on my 2500hd and want to recalibrate my speedo. I took my gps out and it shows 38 mpg when the truck shows 35, it shows 55 when the truck shows 50.

Been thinking of opening up the dash and putting in a new guage face, or cutting up the old gauge face and repositioning it.

Even thinking of glueing on some new numbers to the ip cluster covering.

Anybody ever done this?

crunchy

mmayo · November 19, 2004

NO!!!!!!!!!!!!!!!!

All you need to do now is get a Westers Tune on that bad boy - he'll correct the speedo.

crunchy · November 20, 2004

get a Westers Tune
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600 dollars? Sorry, I just blew my wad on tires.

Maybe I'll just mount my GPS to the dash...

crunchy

Wingnut · November 22, 2004

Westers is a little high...But why don't you look into PCM For Less, they are quite a bit cheaper....And they're a site sponsor

PCM For Less.

haulin' ace · November 22, 2004

How about the SuperLift TruSpeed Calibrator? I have the same problem as you. d**n speedo is way off.

LiftedHDRado · November 23, 2004

How about if you go with Hypertech? It works great! I actually still have mine off my old truck. They go for about $300. That lil computer takes care of everthing. You can change your shifting points, it will resolved the speedometer, also it has a feature to tell the truck that it is running on bigger tires...it goes up to a 37" tire.

Eradan · November 25, 2004

Just bought the superchips tuner (much better than the hypertech)

It'll recalibrate up to a 37" tire.

Not to mention the performance increase !

200.00 on ebay ... well worth the money spent !

How about if you go with Hypertech? It works great! I actually still have mine off my old truck. They go for about $300. That lil computer takes care of everthing. You can change your shifting points, it will resolved the speedometer, also it has a feature to tell the truck that it is running on bigger tires...it goes up to a 37" tire.

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Jacqson · December 22, 2004

I just put 35s on my 2500hd and want to recalibrate my speedo. I took my gps out and it shows 38 mpg when the truck shows 35, it shows 55 when the truck shows 50.

Been thinking of opening up the dash and putting in a new guage face, or cutting up the old gauge face and repositioning it.

Even thinking of glueing on some new numbers to the ip cluster covering.

Anybody ever done this?

crunchy

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Just go to the Dealer and ask them to recalibrate your speedo for the taller tires, thats all I did and it only cost me $30.00. Also you must remember that if you don't recalibrate your computer for the taller tires it can effect all other computer commands within your truck like the antilock braking system. It will also save you from spending a bunch of money on a computer programmer.

potz1999 · December 23, 2004

I just put 35s on my 2500hd and want to recalibrate my speedo. I took my gps out and it shows 38 mpg when the truck shows 35, it shows 55 when the truck shows 50.

Been thinking of opening up the dash and putting in a new guage face, or cutting up the old gauge face and repositioning it.

Even thinking of glueing on some new numbers to the ip cluster covering.

Anybody ever done this?

crunchy

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Just go to the Dealer and ask them to recalibrate your speedo for the taller tires, thats all I did and it only cost me $30.00. Also you must remember that if you don't recalibrate your computer for the taller tires it can effect all other computer commands within your truck like the antilock braking system. It will also save you from spending a bunch of money on a computer programmer.

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I was just talking to my GMC dealer about this, since I just got bigger tires again. They are not reprogramming computers anymore for tire size changes. Apparently this came from the General and has something to do with legal matters. Luckily, I have a Hypertech PPIII. I have used it maybe 50 times for changing tire size, gear ratio, power tuning, shift points, etc. Only sucky thing is if you need to do computer diagnostics, you have to program back to stock beforehand or the diagnostics come out all weird.

Jacqson · December 23, 2004

I just put 35s on my 2500hd and want to recalibrate my speedo. I took my gps out and it shows 38 mpg when the truck shows 35, it shows 55 when the truck shows 50.

Been thinking of opening up the dash and putting in a new guage face, or cutting up the old gauge face and repositioning it.

Even thinking of glueing on some new numbers to the ip cluster covering.

Anybody ever done this?

crunchy

<{POST_SNAPBACK}>

Just go to the Dealer and ask them to recalibrate your speedo for the taller tires, thats all I did and it only cost me $30.00. Also you must remember that if you don't recalibrate your computer for the taller tires it can effect all other computer commands within your truck like the antilock braking system. It will also save you from spending a bunch of money on a computer programmer.

<{POST_SNAPBACK}>

I was just talking to my GMC dealer about this, since I just got bigger tires again. They are not reprogramming computers anymore for tire size changes. Apparently this came from the General and has something to do with legal matters. Luckily, I have a Hypertech PPIII. I have used it maybe 50 times for changing tire size, gear ratio, power tuning, shift points, etc. Only sucky thing is if you need to do computer diagnostics, you have to program back to stock beforehand or the diagnostics come out all weird.

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I can understand that but I think it is up to the individual dealer as to whether they will do it for you. From the Generals perspective I can see that they may look at this as a liability issue which makes sense and if they allow their dealers to do this it may open up a can of worms. When I went to my dealer I told them what I was planning on doing and they had no problem adjusting the computer for the taller tires. I guess maybe it depends on the individual dealer. I don't think it would hurt to ask them if they would do this before you go out and spend a bunch of dough on a computer programmer.