Tire size impact odometer reading?
JK Jedi
Joined: Jan 2007
Posts: 5,350
Likes: 2
From: Lacey, WA
I think that statement was more geared toward the automatic trans. The larger tire size will confuse the shifting and it will hunt for gears because of the perceived slower speed. I don't think there is any performance gain or that the Procal does anything with the engine tuning. The sluggishness you may be feeling can come from the much higher rotational weight of new rims/tires. A small difference in tires/wheels weight takes a lot more power/torque to spin especially if you have 3.21's.
Last edited by armycop; Oct 2, 2011 at 01:00 PM.
JK Enthusiast
Joined: Oct 2010
Posts: 495
Likes: 0
From: Dallas, TX
will correct the ecu and poor performance due to installing lager tires 
isnt that tuning????? to a degree or is this false statement on thier part ? if what thier saying is it corrects poor performance due to larger tires , means that the readings arnt performing correct its kind of misleading to mention ecu !!!! any thoughts on this ?? read what it says correct me if im wrong ? i note my 2011 runs kinda funny after adding 285/70/16s it seems to flood out a little on takeoffs and reverse it would stand to reason if ecu thinks it has 29 inch tires on it and i have 32 inch tires the jeep dosent know how much fuel to send to get it to move !! wich im wondering if this is what thier talking about ! mine seems to want to stall a lot on take offs ! sometimes i feel like i almost have to ride the clutch a bit just so it wont stall and then im taking off faster than what i intended , this needs to be adressed on mine also ! wonder why this happens ? any advise is good advise at this point , thanks
isnt that tuning????? to a degree or is this false statement on thier part ? if what thier saying is it corrects poor performance due to larger tires , means that the readings arnt performing correct its kind of misleading to mention ecu !!!! any thoughts on this ?? read what it says correct me if im wrong ? i note my 2011 runs kinda funny after adding 285/70/16s it seems to flood out a little on takeoffs and reverse it would stand to reason if ecu thinks it has 29 inch tires on it and i have 32 inch tires the jeep dosent know how much fuel to send to get it to move !! wich im wondering if this is what thier talking about ! mine seems to want to stall a lot on take offs ! sometimes i feel like i almost have to ride the clutch a bit just so it wont stall and then im taking off faster than what i intended , this needs to be adressed on mine also ! wonder why this happens ? any advise is good advise at this point , thanks
JK Enthusiast
Joined: Aug 2011
Posts: 109
Likes: 0
From: Turlock, Ca
It only took me a full day to find this quote. Thank you. One extra question, will the pro cal leave a "footprint" on the ECU? I don't want to have any warranty issues on my 12'. Thanks
JK Newbie
Joined: Nov 2011
Posts: 6
Likes: 0
From: edmonton, alberta
Speedometer re-programmer
Just put one of these on a 2012 that was lifted... easy to do, doesnt mess with engine warranty ( like all other programmers that include performance options)
http://www.hypertech.com/products-results.aspx
part # 752001
http://www.hypertech.com/products-results.aspx
part # 752001