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Taking a long road trip, including mountains. Any tips?

road trip mountains

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4 replies to this topic

#1 OFFLINE   raadsel

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Posted 26 May 2016 - 12:33 PM

I'll be doing a long road trip this summer with my C-Max, including some driving in the Rocky Mountains. I'm even considering driving through Rocky Mountain National Park.

 

Any tips for this type of trip -- particularly with many roads having 75 mph speed limits. Also, any tips for taking the C-Max up and down mountains? 









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#2 ONLINE   Plus 3 Golfer

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Posted 26 May 2016 - 05:14 PM

When I go down long, curvy downgrades in the mountains of the West, I try not to use my frictions brakes at all.   I use grade assist and low (engine braking) to control down hill speed.

 

The C-MAX has no problem maintaining  75-85 mph on the mountainous interstates (unlike the Priis).  I generally leave grade assist engaged on the mountainous interstates.  Sometimes, if I want to maintain speed say on not so steep long downgrades, I'll shift into neutral to pick up speed  and then back to D.



#3 OFFLINE   livesmith

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Posted 27 May 2016 - 07:51 AM

When I go down long, curvy downgrades in the mountains of the West, I try not to use my frictions brakes at all.   I use grade assist and low (engine braking) to control down hill speed.

 

 

As I understand it, Grade Assist will still use friction brakes if it still needs to slow the car and it can't use any more regen.  So, if it's doing a good bit of work there's a good chance you are still using friction brakes.  



#4 ONLINE   Plus 3 Golfer

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Posted 27 May 2016 - 08:55 AM

I haven't seen grade assist use the friction brakes.  Grade assist will spin ICE to very high rpm though to maintain speed.   And if you shift to low, you immediately engage ICE and can slow down without friction brakes most times. Once you slow down below the grade assist speed, grade assist no longer is applicable.  Also, when the HVB is full and regeneration is not possible, ICE will spin up for normal engine braking like any car when left in drive.  Most times though you can shift to L and the additional engine braking is sufficient to slow down if one plans / knows the road ahead.

 

What I do when I need to slow down, I shift to low, disengage grade assist and when I've slowed enough engage grade assist and shift out of low and repeat as needed especially when entering a down hill hair pin turn.  It works remarkably well.

 

I have monitored brake pressure when dropping IIRC about 1700 feet in about 4+ miles or so with several hairpin turns and many switchbacks.  The friction brakes were never applied.  For those that have traveled between Globe and Show Low AZ on US 60, it's the stretch of 60 dropping down and crossing the Salt River. 


Edited by Plus 3 Golfer, 27 May 2016 - 09:25 AM.


#5 OFFLINE   stevedebi

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Posted 27 May 2016 - 11:46 AM

As I understand it, Grade Assist will still use friction brakes if it still needs to slow the car and it can't use any more regen.  So, if it's doing a good bit of work there's a good chance you are still using friction brakes.  

+1 to Plus 3 Golfer. The friction brakes will only come on when you press the brake pedal.








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