What's new
By:
Ram Heavy Duty Forum

Register a free account today to become a member! Once signed in, you'll be able to participate on this site by adding your own topics and posts, as well as connect with other members through your own private inbox!

Tire Size Calibration, Shift Points and Tire Pressure Adjust(warnings/setpoints)

Awesome, thanks @Brutal_HO , I always appreciate you jumping in on these questions.

Are you saying then that this is really not big enough to worry about?
I'm not at all worried about my speedo, more worried about whether I am impacting performance enough to matter. I tow a pretty heavy 5th wheel at 16,800, but I do have an HO, so just trying to sort it all out.

Thanks again,
B
 
I can’t remember my stock tire size but my change was more like 5%. Wasn’t a life changing ordeal but the shift points are better now and the Speedo is accurate
 
kobra said:
Awesome, thanks @Brutal_HO , I always appreciate you jumping in on these questions.

Are you saying then that this is really not big enough to worry about?
I'm not at all worried about my speedo, more worried about whether I am impacting performance enough to matter. I tow a pretty heavy 5th wheel at 16,800, but I do have an HO, so just trying to sort it all out.

Thanks again,
B
Click to expand...

I would say a 2.5% 2MPH difference will affect shift points marginally if at all. I guess it matters what (accurate) speed you typically tow at if you're in the best RPM range for fuel mileage and power, and whether you already have an AlfaOBD setup or access to one, and could easily change the tire size.
 
Brutal_HO said:
I would say a 2.5% 2MPH difference will affect shift points marginally if at all. I guess it matters what (accurate) speed you typically tow at if you're in the best RPM range for fuel mileage and power, and whether you already have an AlfaOBD setup or access to one, and could easily change the tire size.
Click to expand...

Ok, thanks again.
Don't have anything like a programmer yet, so likely will leave it until I decide what I need. With the 3500, the TPMS alerts are not an issue, so the decision may be based on whether there are other things I may need to change that may justify the AlphaOBD.

B
 
kobra said:
Ok, thanks again.
Don't have anything like a programmer yet, so likely will leave it until I decide what I need. With the 3500, the TPMS alerts are not an issue, so the decision may be based on whether there are other things I may need to change that may justify the AlphaOBD.

B
Click to expand...

Jimmy07 has reported that if you adjust the presets in the tire fill assist app, it will lower the TPMS thresholds.

Haven't had a chance to check that out as mine were already set with AlfaOBD when I did the tire size change.
 
talked to my local dealership, they will do it as long as I purchase a 200.00 service contract. Hey let them take responsibility for screwing it up, if they do its covered. (tpms settings and tire size)
 
Brutal_HO said:
Jimmy07 has reported that if you adjust the presets in the tire fill assist app, it will lower the TPMS thresholds.

Haven't had a chance to check that out as mine were already set with AlfaOBD when I did the tire size change.
Click to expand...
Does that hold true with a 2020?
 
JesseLackman said:
Does that hold true with a 2020?
Click to expand...
it only takes a minute to check..Some have reported it works others have said it did not work for them. Might be lucky. I would have tried it but I already used the procal to reset mine down to 45 psi and I needed it to calibrate the speedo.
 
kobra said:
I've gone from the OEM 285/60R20 to 295/70R18, which if I have it right is about 2.5% larger. Is this enough of a difference to make a difference?

BTW, I can't find the AEV Procal Snap in stock anywhere

Thanks!
B
Click to expand...


I just ordered from AEV. Unless I'm overlooking it the "Does not work on Power Wagon" statement has also been removed from their site.
 
JHD1827 said:
I just ordered from AEV. Unless I'm overlooking it the "Does not work on Power Wagon" statement has also been removed from their site.
Click to expand...
they have updated the software so it know works on new power wagons.
 
jadmt said:
it only takes a minute to check..Some have reported it works others have said it did not work for them. Might be lucky. I would have tried it but I already used the procal to reset mine down to 45 psi and I needed it to calibrate the speedo.
Click to expand...
Mine TFA allows me to change the thresholds but seems to reset every time I turn the truck off. Not sure why it’s not working, but one thought is that it allows you to adjust them (up or down) just not below the 65psi minimum.

(to be clear, it lets you adjust below 65psi and appears to take, but just doesn’t stay programmed once truck is cycled.)
 
HD5280 said:
Mine TFA allows me to change the thresholds but seems to reset every time I turn the truck off. Not sure why it’s not working, but one thought is that it allows you to adjust them (up or down) just not below the 65psi minimum.

(to be clear, it lets you adjust below 65psi and appears to take, but just doesn’t stay programmed once truck is cycled.)
Click to expand...

I don't even have the TFA as an option on my truck. Not listed in any of my Uconnect settings. According to the manual it's an "if equipped" option. What option on the truck gives you TFA? My truck is fully loaded. Maybe power wagons don't get it?? @RamCares
 
AnthonyD1978 said:
I don't even have the TFA as an option on my truck. Not listed in any of my Uconnect settings. According to the manual it's an "if equipped" option. What option on the truck gives you TFA? My truck is fully loaded. Maybe power wagons don't get it?? @RamCares
Click to expand...
Did you try to enable it in the cluster? I think you have to do that first
 
HD5280 said:
Mine TFA allows me to change the thresholds but seems to reset every time I turn the truck off. Not sure why it’s not working, but one thought is that it allows you to adjust them (up or down) just not below the 65psi minimum.

(to be clear, it lets you adjust below 65psi and appears to take, but just doesn’t stay programmed once truck is cycled.)
Click to expand...
You have to delete the old presets. Try that. There is a button to access the presets
825D1507-C6D8-423F-B3EC-84CF4F403BA8.jpeg
 
eldedo said:
talked to my local dealership, they will do it as long as I purchase a 200.00 service contract. Hey let them take responsibility for screwing it up, if they do its covered. (tpms settings and tire size)
Click to expand...
what is included in the $200 service contract? did you ever do this and did it work?
 
You must log in or register to reply here.
Back
Top