I am looking for a programmer that I can borrow to adjust my tire size, and give back to a bud. So I need to know if there is a programmer out there that can adjust the tire size without installing a performance tune, I just need to adjust the tire speed, and give it back. I know I can just buy a "TirePak" or "Superlift TrueSpeed" or have it adjusted at the dealer, but If I am going to spend money on fixing my tire speed, I might as well just put the money towards the programmer I want.

Thanks, Fallas

 

One name "Smarty"

 

That's a good question. I know the Smarty has to have a Catcher tune installed to change tire size.

How big are your tires? The stock ECM only goes up to 285's (at least with the 06's). With some of the programmers (ie. Smarty) you can increase the size up to 44" or something. The programmers probably have to use a non-stock tune to get that capability out of the ECM though.

 

The Smarty needs to have the tune installed to adjust the tire size....

Thanks though



BTW: I went to 285/70/17s

 

Bodie everyone I know in CS has their speedos off due to tire size. I just did the math and figure it up while cruising down the road.

So your stock size was 265? 265/285....so your speedo is .07% off. I just round to say 10%. So at 30, i'm going roughly 33. At 70, I'm going roughly 77....and when my speedo says 110, i'm really going 121mph!

The only way to re-calibrate without buying a Smarty is to have the dealer do it.

 

i adjusted my tire size with my smarty and when i take it back to stock it still remains. i have also changed it with out a catcher tune being programmed!

brett

 

How in the world did you pull that off? I've tried!!!

 

My Snapon Brick Scanner will change pinion factor on 05 and back.

Maybe you could just have a buddy that works at a shop fix it up?

 

You know that got me thinking about when I pulled the Smarty off I still had high idel........ I wounder........ hmmmmmmm

Did you check you speed with a GPS?

I just want it to be done right, and I suck at math

 

The high idle remains because Smarty uses the most recent stock software from DC.

I don't see how it's possible to program the tire size without a tune installed. My Smarty doesn't even show that option until a tune is uploaded.

 

idk how it works, ill take it back to stock, then remember that the speedo is wrong now. so i hook the smarty up to check and low and behold its still at 32.5 which is what i set it at for my 33s. possibly the mystery will never be solved...

brett

 

Wow, that's weird man. What if you had it set at 40" with the stock program and brought it in to the dealer? Seems they would know something isn't right.

Mine seems to "save" the tire setting somehow when going from Catcher, to stock, to another Catcher. I haven't figured that one out yet. The Smarty must save your tire size in it's memory or something?

 

i have no idea. i was thinking the same thing about the dealer seeing the different tire size? what is the stock tire size so i can take it back to it when i go back to my friendly neighborhood dealer? next time i mess with changing it, ill do some experiments.

brett

 

I do not think it will be a problem with any dealer if they even notice the setting has changed. The tire size can be adjusted by any tech that has a scan tool. A local speed shop adjusted mine with a snap-on scan tool. I think it was under the Brake ABS section and is adjusted by choosing a different rev per mile number that the tire you purchased should have in its specifications. I changed from the stock 17" tires to 19.5"x 265 and my speedo is close enough for me. I to want to use a GPS to get this as accurate as possible at some point but it is close enough for now. I went to one of the many websites that have calculators to tell what the tire differences would be and have it as close as I could without using a GPS.

Hope you now someone with a good scan tool and I am sure they can help you get this set. Dodge Dealer wanted $45 dollars to make the change. The local speed shop changed it while I was picking up some fender flares.

Good Luck, Jeff

 

Unfortunately for us '06 guys that doesn't work. The dealer can only program up to 285's.