Impala Forums banner

--Stock 19" Rims to 20" Aftmkt Question, ECU, Shift patterns, etc will be OK?--------

2K views 8 replies 7 participants last post by  Fast Eddie 
#1 ·
--Stock 19" Rims to 20" Aftmkt Question, ECU, Shift patterns, etc will be OK?--------

2018 Impala 3.6, going to 20" rims, has 19" stock, was wondering if this would mess up anything ECU wise.


Thanks in advance
 
#2 ·
Depending on the tire size difference, the only thing I could think of that would be off would be your speedometer reading.

Here's a really handy website: https://tiresize.com/speedometer-calibration/

Just plug in your old tire size, your new tire size, and see how far off your speedometer reading will be from your actual speed.

Hope this helps!
 
#3 · (Edited)
Depending on the overall size difference (tire+wheel), you could also alter shift points as well, since shift points are based on both pedal position and reported speed. Since the reported speed will be altered by the overall tire+wheel size difference, you actually alter the shift points too. Now very minor overall size differences wouldn't really be a problem, but something to keep in mind depending on how big of a difference there is in overall size.
 
#7 ·
Its same except I used plastic "HUB CENTRIC" rings and two different tire shops, three different balances and there is still a vibration. Its very subtle, it does feel like the tires needs balanced but I doubt it(BF Goodrich.)



I have aluminum ones on the way, gonna swap them out soon to see if it makes a difference.
 
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top