Jump to content

Larger tires - Speedometer correction

Haufski762
 Share

Recommended Posts

  • Replies 40
  • Created
  • Last Reply

Top Posters In This Topic

Popular Days

Top Posters In This Topic

Popular Days

Popular Posts

Jus Cruisin
Jus Cruisin

Then, if they did it, you'd complain about the cost which would be a 1 hour minimum charge ($125/hr now?) to create the RO, get the truck out of the lot, pull it in actually do the programming, get it

Jus Cruisin
Jus Cruisin

Yep and I'm sure it would be the case for 99%+ on here. 

newdude
newdude

Bingo lol.  More like $165-245 for that hour nowadays.  

Posted Images

Jus Cruisin Enthusiast

Jus Cruisin

Posted
Posted

I used to go with lifts and significantly bigger tires. Long before all this computer/electronic stuff. I never messed with changing speedo gears. Now with all the GPS available to you just compare it to speedo readings and adjust in your head. Plus....now you're staying in warranty longer by showing fewer miles than actual. 

newdude Senior Enthusiast

newdude

Posted
Posted
11 hours ago, Haufski762 said:

Gents, 

 

Is there a way to correct the speedo for larger tires? The dealership says they can't. 

 

 

GM will only calibrate to factory authorized sizes for things like GM accessory wheel/tire packages.  

 

 

Vincej138 Enthusiast

Vincej138

Posted
Posted

Unless you went from stock to like 40's, your only gonna be off 1-3mph. Stock to 35's on the idash is 2mph diff at 70mph. And my drive safe and save app doesnt yell at me when im doing 71 in a 65. It does when im 8 over... so ya

 

Went from stock to 315/70/17's

Haufski762 Enthusiast

Haufski762

Posted
  • Author
Posted (edited)

I'll have to check the tire size but I had the speedo set at 82 and I was passing people like crazy. According to my GPS I was doing 90.

Edited by Haufski762
newdude Senior Enthusiast

newdude

Posted
Posted

Some food for thought for the 19-22 pre-refresh folks.  MC-10202392-9999.pdf (nhtsa.gov)

 

Problems are arising and growing from aftermarket speedo inline calibrators and warranty is grounds for blocking if its found and causing one or more of the listed concerns.  They also can interfere with programming done at the dealership.  

 

 

Zeker Enthusiast

Zeker

Posted
Posted
19 hours ago, Steve-2019 said:

 

This shows only for 2021 models and older.  The OP has a 2023 which is newer technology.

 

Correct. I figure if he was interested he could contact Rough Country and see if they would be releasing one for the 2022 and newer models.

Transient Senior Enthusiast

Transient

Posted
Posted
On 1/17/2024 at 4:00 PM, newdude said:

Some food for thought for the 19-22 pre-refresh folks.  MC-10202392-9999.pdf (nhtsa.gov)

 

Problems are arising and growing from aftermarket speedo inline calibrators and warranty is grounds for blocking if its found and causing one or more of the listed concerns.  They also can interfere with programming done at the dealership.  

 

 

So, stay away from dealerships.  Got it.  Glad I didn't buy the SCA Black Widow edition. 

 

Ironically, this is counter to what GM says it would be doing for dealers -- get people into the service department to generate revenue for the dealer.  You'd think they'd create ways to assist customers as an enticement to get them into the service department.  If only they offered speedometer calibration services.  I digress and I'm well off topic now, so I'll move along.

newdude Senior Enthusiast

newdude

Posted
Posted
7 hours ago, Transient said:

So, stay away from dealerships.  Got it.

 

Ironically, this is counter to what GM says it would be doing for dealers -- get people into the service department to generate revenue for the dealer.  You'd think they'd create ways to assist customers as an enticement to get them into the service department.  If only they offered speedometer calibration services.  I digress and I'm well off topic now, so I'll move along.

 

 

My point is more that these devices are causing problems either from just being installed or they cause problems during any type of ECM, BCM, TCM, etc. programming.  So even if you avoid a dealership and have some repair shop work on the issue, that device can still be the cause of whatever is going on.  

 

They do offer calibrations, but again only for factory authorized sizes.  If GM offered a 35" wheel/tire package, they'd have a calibration.

The Raven Enthusiast

The Raven

Posted
Posted (edited)
6 hours ago, newdude said:

 

 

My point is more that these devices are causing problems either from just being installed or they cause problems during any type of ECM, BCM, TCM, etc. programming.  So even if you avoid a dealership and have some repair shop work on the issue, that device can still be the cause of whatever is going on.  

 

They do offer calibrations, but again only for factory authorized sizes.  If GM offered a 35" wheel/tire package, they'd have a calibration.

 

It is almost impossible for an inline speedometer calibrator, that simply intercepts and translates the VWSS pulse, to cause any real issue.  But even if that were the case, all one has to do is remove the device, and see if the issue goes away.  If it doesn't, take it to the dealer.  No problem.

 

To add to the subject of this thread - there is not yet any way to calibrate the refresh trucks for tire size changes, or for that matter, anything at all...not even any inline translator boxes.  There is no guarantee that there ever will be either - just hope.  The Corvette and Tahoe/Yukon have been on this architecture since 2020 and 2021 respectively, and there's no progress there either.  

Edited by The Raven
Transient Senior Enthusiast

Transient

Posted
Posted
12 hours ago, newdude said:

 

 

My point is more that these devices are causing problems either from just being installed or they cause problems during any type of ECM, BCM, TCM, etc. programming.  So even if you avoid a dealership and have some repair shop work on the issue, that device can still be the cause of whatever is going on.  

 

They do offer calibrations, but again only for factory authorized sizes.  If GM offered a 35" wheel/tire package, they'd have a calibration.

I got your point, which is why I said "avoid the dealership".  It's my point I think you missed.  GM isn't serious about getting customers into the service departments at their franchise dealerships.  Something as simple as speedometer calibration could go a long way in customer service, customer  retention, and generated revenue/increased profits for their dealerships.  By your admission they have the technology and means.  They just need to stop being so narrow minded.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing

  • Recently Browsing   0 members

    • No registered users viewing this page.

  • Forum Statistics

    250.4k
    Total Topics
    2.7m
    Total Posts

  • Member Statistics

    342,762
    Total Members
    8,960
    Most Online
    Chris80s
    Newest Member
    Chris80s
    Joined

  • Who's Online   4 Members, 1 Anonymous, 688 Guests (See full list)

  • Latest Articles

  • Posts

    • BCGM
      Recalls 2024 Chevrolet HD

      By BCGM · Posted

      JW2024 and Others is this site for Oshawa built Trucks as well ? Thank You !
    • BCGM
      Remote Start Noise 2024 2500 HD Gas

      By BCGM · Posted

      Thanks JR that would be great if you could do that !!! Do you have a link to where this was discussed before ? I cant seem to find it  Thank You Again !
    • Another JR
      Remote Start Noise 2024 2500 HD Gas

      By Another JR · Posted

      Oil pump noise was discussed before.  I will try to remember to record a remote start later this morning. 
    • Chuck FB
      MPG at 600 miles

      By Chuck FB · Posted

      There are probably a few threads talking about fuel mileage but this one seemed to fit the stats I have seen based on my typical local driven route but with different outcomes based on different seasons/temperatures. I have a few hundred pounds of items that consistently ride on the truck at all times such as a bak flip cover, rubber bed mat, tools and extra fuel so I would be something over 8100 lb without me in the truck. All these examples are based on a 100 mile round trip to a town plus running around town so maybe 110 to 120 miles in total for a trip. Using regular fuel and I assume it always has some ethanol in it but don't know the percentage they blend in. Also speed wise I am going at 62 mph and non aggressive driving although less speed yet if its crappy winter condition roads. I am going by an initial reset of the computer generated fuel use numbers averaged over a couple of thousand miles or so for each weather/season so they may be more optimistic then actual hand calculated numbers. Basically this is painting a picture of doing the same drive but seasonal conditions and temperature being the major variable to the end result. Oh and although I am in Alberta Canada, I am converting it to miles per US gallon so there is no confusion.    So winter time it gets cold here, no real surprise there and the roads can be clear at times but also often have packed rough snow or are are driving through loose snow ( they do a poor job of plowing the highways ) and yes this includes the extra idle engine time due to trying not to freeze ones butt off. 12.7 mpg is what I was getting during the winter months on average.    Then during the spring when it was around the freezing point and the highways are clear of snow, I was getting around 14.25 mpg.   Summer time, I have been getting around 15.15 on average but certainly some of the trips showed quite a bit better fuel mileage, so much depended on how much or little I had driven around town and number of engine restarts after sitting for a while at each location. But stating a best fuel mileage trip to town pretending that is what the truck gets on average is fooling ones self for sure !.      As I said in a different post, I had driven a 645 mile trip over a couple of days stint to a different destination then these other daily to town examples above, and was done during the summer with nice weather and not bucking a head wind, also keeping at 62 mph and its a rolling landscape type highway drive ( this isn't southern Alberta or Saskatchewan flat lands ) Hand calculated fuel mileage in this case though and it came out to 17.65
    • Chris80s
      Factory front brake rotors...defect?

      By Chris80s · Posted

      On my wife's 2020 Blazer (~69000 miles), we started to notice the brakes pulsating at faster speeds. Typically around town you don't notice anything, but highway/interstate driving you will notice it. I decided to pull of the front tires and look at the brakes. I figured with the milage, the pads should be wearing out to their life span, but they actually looked decent. Still with "meat" on them. One pad has a ridge wearing in it, and that same rotor is showing the ridge too. That's not the concerning part...the other rotor appears to have a raised bump on it!  The picture make it look like a pimple! Very odd and strange! NOTE: These are the factory brakes and rotors.   I'm attaching pictures of the front brakes and what they look like ate ~69000 miles.

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...