Subaru Tribeca How Fast Can It Roll?

subaru
engines
tribeca
transmissions

#1

I go down a steep gravel road that at one point is 1/2 mile concrete ramp. I use 1st gear to try to reduce wear on my brakes - how many RPMs are safe? Is there some speed at which syncros or other transmission issues arise - I am not getting anywhere near the engine redline RPMs, but I know that is probably set for circumstances other than gravity pulling me to a high speed/RPM.


#2

Is your transmission manual or automatic?
What is the model year of your Tribeca?
What is the redline on your tachometer?

I have the same 3.6 liter engine in my 2011 Outback, and it is redlined at 6,600 RPMs.

That being said, I would not be comfortable in this situation if the engine was turning at more than 4k for 1/2 mile or more, even if the engine can safely rev higher than that. If I was in your situation, I would use both the brakes and the transmission to control both vehicle speed and engine speed.


#3

Don’t worry about your brakes. They cost a fraction compared to repairing your automatic transmission. You also waste lots of fuel revving excessively.

I would not allow the motor to rev past 3500 rpm. So use first or 2nd gear as appropriate.


#4

Brake pads are the cheapest part on your car. Use them.


#5

“You also waste lots of fuel revving excessively”

I doubt the engine is using any more fuel than at idle, as the computer would not inject any additional fuel seeing no throttle angle.