Originally Posted by Altitudeftw
Hey guys, a couple times I accidentally hit the shifter and knocked it into sport mode mode. My question is is there some kind of automatic protection against damaging the transmission when it's dropped into lower gears?
All modern cars have some over-revving protection. If left in AUTO, your Jeep will up-shift, but even in MANUAL control mode (with the paddle shifters), while it will hold gears it will not let you rev it into the red line.
Here's a way to assure yourself of these protections. Drive your Jeep to about 30 mph, then while maintaining the speed via the throttle, switch to MANUAL mode and try to up- or down-shift through the gears. You will see a message "Shift not allowed
" and the car will not change gears. If in AUTO you might be in 5th at 30 mph, you might be allowed to select up to 6th or down to 3rd in MANUAL mode but not any further. That is your protection.
But as others have said, SPORT mode can be used indefinitely.
NOTE: Protections exist at multiple levels in the ECU software. The 10-year old ECU in my Subaru
(I have a Legacy GT which was a new platform at the time, on which the subsequent WRX was based) has a specific per gear torque request table as well as an RPM limit (per gear). My tuner put a limit of 3500 rpm in 1st gear and a max value of 250. This way my launches would not be too forceful / stressful on the transmission. I also have a limit at the upper end because at WOT in 5th gear I would be running out of fuel (long story with a history of failed fuel pumps). But if I were to be going WOT in 5th gear, it means I was doing something
. And I ended up revving into the rev limiter 3-4 times in these past 10 years and it is an instant fuel cut-off which sucks an scares the shit out of you especially when you expect additional motivation from the engine.
Protections exist. Don't worry about it. Enjoy your SPORT mode.