by MSUPKR [OP] » Oct 27 2011, 9:40pm
by parrothead » Oct 28 2011, 5:06am
by trout_champ » Oct 28 2011, 6:49am
by SSGBulldawg » Oct 28 2011, 7:40am
by EKinMN » Oct 28 2011, 12:27pm
by Z15 » Oct 28 2011, 2:56pm
by SRMN8R » Oct 28 2011, 3:50pm
by MSUPKR [OP] » Oct 28 2011, 5:59pm
Z15 wrote:The problem with changing tire sizes is that the PCM does not know you changed tire size and it still operating with the assumption the OEM size are on the vehicle. This can throw off when the transmission up-shifts/downshifts, when over-drive kicks in, when the torque converter locks. This can cause the engine to work harder because it is no longer is operating within the designed torque range that the PCM is programmed with.
Also, when you go bigger, the tires get wider so any economy that might seem possible is negated by the wider tire causing more rolling resistance (pavement friction), drag (pushing air) and more un-sprung weight, all detrimental to fuel economy.
Ideally you would want to get with skinny tires but there is a slim chance any truck owner would do that.
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