Should I correct speedo or not.

[TCrawley]

Recently installed 285's and my GPS tells me I am now 1. 6mph slower than actual. Would you correct for error. How is this done? Thank you for any help or thoughts.

 

[nickleinonen]

Would you correct for error.

i wouldn't [i am rolling on 315's with no speedo correction]

How is this done?

dbr3 scan tool to reset rotations per mile or with a superlift truspeed box...

 

[rbattelle]

I disagree. If it were me, I'd correct it no matter what so that my odometer would be accurate. But I'm a little anal about those sort of things...



-Ryan

 

[JVolpe]

I agree with rbattelle, I would have the "Pinion Factor" reprogrammed with any tire size change. I want the computer to know the correct readings, I dont know exactly what the Pinion Factor can affect, but since it is in the ABS programming section seems it might be important to stopping. Just my . 02.



Of course my Dealer Service Manager did mine for free when I drove in and ask about it. Took 5 minutes to ask the question and be ready to go.

 

[jwduke]

Is it just me, or is the speedometer inacurate from the factory? I have gone past several of those "Your speed is", and mine is off by 2 mph. Now if my figures are right, this is around 4% off. Take 4% of 36,000 miles, and that is 1,440 miles that DC just screwed you out of in warrenty miles! Take that number times the number of cars and trucks DC makes every year, that is quite a dollars savings in the course of a year the DM has.



Just a thaught..... sorry for the thread hijack!

 

[CLAYTON]

I haven't gotten mine fixed yet. It doesn't really bother me. My speedo is off by about 9. 1%.

 

[TinyInOhio]

I asked a friend who used to work for one of the Big 3 why the speedos were off from the factory, and he did not know. Never thought about warranty issues, but it does make sense.

 

[DPKetchum]

Well on and off for years had folkes come in speeding tickets swearing speedo was off. Never found a new vehicle speedo off. The ones I've checked by mile markers,other vehicles,stop watch's and the digital on the side of the road the vehicles have always been dead on this last decade.

 

[67guzzler]

I disagree. If it were me, I'd correct it no matter what so that my odometer would be accurate. But I'm a little anal about those sort of things...



-Ryan

I'm with you Ryan. Now that I have these balloons I'm reading around 63. 5 mph at 70 mph. Sure does ride soft tho. Worth it for that alone. Those E rated tires and these solid axles were beating the crap out of me. This is like a Cadillac by comparison.



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I just have to figure out a way to do it. I really wish they made a reasonably priced gadget to do this so I don't have to go to the dealer.



I went on flEbay and saw a bunch of CAN BUS OBD2 stuff that hooks into your notebook PC but I don't know if any of it will let me get into the ABS section to change the revs per mile... . I doubt it.

 

[DMesloh]

Is it just me, or is the speedometer inacurate from the factory? I have gone past several of those "Your speed is", and mine is off by 2 mph. Now if my figures are right, this is around 4% off. Take 4% of 36,000 miles, and that is 1,440 miles that DC just screwed you out of in warrenty miles! Take that number times the number of cars and trucks DC makes every year, that is quite a dollars savings in the course of a year the DM has.



Just a thaught..... sorry for the thread hijack!

Mine was off 2 mph fast as per GPS and road side radar now after the tire change it reads . 9 slow, just me but I can live with that. I'd rather keep the dealer out of my truck.

 

[GWBourne]

Recently installed 285's and my GPS tells me I am now 1. 6mph slower than actual. Would you correct for error. How is this done? Thank you for any help or thoughts.

i am running 315'2 and not corrected. i wish i was, BUT the stealershipp wont change it for free and im not paying 84 dollars to have 5 min of "tough" labor done...

bastids...

Grant

 

[67guzzler]

i am running 315'2 and not corrected. i wish i was, BUT the stealershipp wont change it for free and im not paying 84 dollars to have 5 min of "tough" labor done...

bastids...

Grant

I agree Grant! Maybe we all could chip in and buy a StarScan Diagnostic unit to share. The heck with the dealers. 1/2 of them don't know what they're doing anyway.

 

[rbattelle]

Maybe we all could chip in and buy a Star Diagnostic unit to share.

I've considered proposing this to the TDR, but I'm not sure it could be done in a way that doesn't risk someone getting screwed.



-Ryan

 

[67guzzler]

Nod. Prolly one of those ideas that are better in theory than reality.....