Hill Climb in Snow - Page 4 - Toyota RAV4 Forums
4.3 Mechanical Intakes, Exhaust, Tune-ups, 4x4 system, Suspension, Brakes, etc.

User Tag List

Reply
 
LinkBack Thread Tools
#31 (permalink) Old 12-30-2012, 02:19 AM
Advanced Member
Country: rav4two's Flag is: United States
 
Join Date: Oct 2009
Location: Pacific Northwest
Posts: 2,368
Thanks: 3
Thanked 39 Times in 35 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quote:
Originally Posted by JuneBug View Post
I fixed the photos, and the links to tirerack work now.
Thank you, James! You are awesome!

2010 Rav4 AWD V6 - Wife's
2007 Civic LX - Daughter's
1996 BMW 328i - Son's
1995 Miata - Daily Driver
2011 Corvette - Unintentional garage queen

rav4two is offline  
Sponsored Links
Advertisement
 
#32 (permalink) Old 01-01-2013, 02:48 PM
Your Humble Administrator
Country: JuneBug's Flag is: United States
 
JuneBug's Avatar
 
Join Date: Nov 2008
Location: Baton Rouge, LA
Posts: 10,523
Thanks: 69
Thanked 1,093 Times in 792 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Garage
Quote:
Originally Posted by Carbon View Post
more choices for you to try:
4] Use "Downhill Assist" button.
Quote:
Originally Posted by Dr. Dyno View Post
Downhill Assist (DAC) is only for controlled descents at very low speeds. It uses the ABS & engine braking better than any human could. Works in both Drive and Reverse. I've tested it and recommend everyone does.

DAC does not apply because he's going up not down hill...
Quote:
Originally Posted by Carbon View Post
It works uphill too. It would maintain a slow steady speed allowing her to concentrate on steering rather than throttle control. Compression braking would not come into effect.
Uh, sorry Carbon, but the good Dr. is correct. I tried going up my neighbor's not-so-steep driveway in L with DAC engaged and it does not go uphill. I even gave it a little gas to get halfway up, and it started to roll back. When I shifted to R, it worked backing down. The reason it doesn't work is the DAC has no control over the throttle, just the brakes.

James
__________________

2008 Limited V6 2WD "The Silver Bullet"


JuneBug is offline  
#33 (permalink) Old 01-01-2013, 04:19 PM
Advanced Member
Country: Dr. Dyno's Flag is: United States
 
Join Date: Jan 2010
Location: Eastern CT
Posts: 3,925
Thanks: 137
Thanked 276 Times in 259 Posts
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quote:
Originally Posted by JuneBug View Post
When I shifted to R, it worked backing down. The reason it doesn't work is the DAC has no control over the throttle, just the brakes.
It also controls the transmission. When I tried it on a VERY slippery snowy grass hill it made some really neat hydraulic flow type noises I'd never heard before. It worked so well there's no way a human could do better. W/o DAC all my attempts going forward or backward resulted in virtually no control just a slide to the bottom.
Dr. Dyno is offline  
#34 (permalink) Old 01-01-2013, 04:59 PM
Advanced Member
Country: Rickl's Flag is: Canada
 
Rickl's Avatar
 
Join Date: Aug 2007
Location: Ontario
Posts: 1,151
Thanks: 7
Thanked 88 Times in 74 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quote:
Originally Posted by Dr. Dyno View Post
It also controls the transmission. When I tried it on a VERY slippery snowy grass hill it made some really neat hydraulic flow type noises I'd never heard before. It worked so well there's no way a human could do better. W/o DAC all my attempts going forward or backward resulted in virtually no control just a slide to the bottom.

In this thread from back in 2008, the poll reported that ABS did not stop working at low speeds, but references were quoted that showed ABS does stop working at speeds below 12 MPH. Operating the DAC switch causes the ABS to begin working again at very slow speeds.

Without DAC I imagine that your wheels had locked and you were just sliding down that snow covered grassy hill.

Rick L Ontario Canada
2008 Silver RAV4 Limited V6 4WD
Rickl is offline  
#35 (permalink) Old 01-01-2013, 05:41 PM
Senior Member
Country: bob-o's Flag is: United States
 
bob-o's Avatar
 
Join Date: Nov 2012
Location: central oregon
Posts: 316
Thanks: 6
Thanked 26 Times in 24 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
In my 2012 the abs seems to function all the way down to a couple mph. in normal mode.

There is a steep icy hill coming out of my place, hard and slick, and with the stock Toyo A20's I felt completely unsafe, even with 4wd locked. I put on a set of Blizzaks and it is a completely different vehicle. I'm headed up into the deep stuff tomorrow for a real test.

2012 V6 4WD Ltd.

if you're not part of the solution, you're part of the precipitate.
bob-o is offline  
#36 (permalink) Old 01-04-2013, 05:57 PM
Advanced Member
Country: Dr. Dyno's Flag is: United States
 
Join Date: Jan 2010
Location: Eastern CT
Posts: 3,925
Thanks: 137
Thanked 276 Times in 259 Posts
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quote:
Originally Posted by Rickl View Post
In this thread from back in 2008, the poll reported that ABS did not stop working at low speeds, but references were quoted that showed ABS does stop working at speeds below 12 MPH. Operating the DAC switch causes the ABS to begin working again at very slow speeds.

Without DAC I imagine that your wheels had locked and you were just sliding down that snow covered grassy hill.
Correct, w/o DAC I slid right down wheels locked with no ABS action. My 1999 F-250 did the same thing. After that trying DAC was nothing short of amazing.

On the ABS not working, what I found on both the RAV4 and my old '94 Accord was that below a certain very slow speed that I don't remember, applying the brakes resulted in them working but w/o ABS. Some readers misread it as saying the brakes didn't work at all. Above that speed ABS worked all the way to 0 mph.

Fred
2006 RAV4 V6 4WD Red Limited - wife's
2006 Accord V6 Hybrid - Dr. Dyno's - quick as the RAV but +8 mpg
2003 Odyssey V6 - handy people & cargo mover
1999 F-250 4X4 Diesel - snow plow, Bully Dog chip
2001 F-250 4X4 Diesel - truck camper, TS chip, 20' bike/trike dyno trailer
2004 Suzuki DRZ-400S Dual Sport

It's the pedal (or the handgrip) on the right!!
Dr. Dyno is offline  
#37 (permalink) Old 01-04-2013, 06:02 PM
Advanced Member
Country: Dr. Dyno's Flag is: United States
 
Join Date: Jan 2010
Location: Eastern CT
Posts: 3,925
Thanks: 137
Thanked 276 Times in 259 Posts
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quote:
Originally Posted by bob-o View Post
In my 2012 the abs seems to function all the way down to a couple mph. in normal mode.

There is a steep icy hill coming out of my place, hard and slick, and with the stock Toyo A20's I felt completely unsafe, even with 4wd locked. I put on a set of Blizzaks and it is a completely different vehicle. I'm headed up into the deep stuff tomorrow for a real test.
Bob, you've GOT to try DAC! Just turn it on, head down and take your feet off the gas and brake.
Dr. Dyno is offline  
#38 (permalink) Old 01-04-2013, 06:06 PM
Advanced Member
Country: Dr. Dyno's Flag is: United States
 
Join Date: Jan 2010
Location: Eastern CT
Posts: 3,925
Thanks: 137
Thanked 276 Times in 259 Posts
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quote:
Originally Posted by Willow View Post
Fixed it for you
Quote:
Originally Posted by Dr. Dyno
Quote:
Okay, the one sentence simple solution: Move south.
Your winter driving problems will be over w/o pushing any buttons.
You deserve thanks for that!
(He changed my "Get a set of tires for winter." to "Move south." Brilliant!)

Fred
2006 RAV4 V6 4WD Red Limited - wife's
2006 Accord V6 Hybrid - Dr. Dyno's - quick as the RAV but +8 mpg
2003 Odyssey V6 - handy people & cargo mover
1999 F-250 4X4 Diesel - snow plow, Bully Dog chip
2001 F-250 4X4 Diesel - truck camper, TS chip, 20' bike/trike dyno trailer
2004 Suzuki DRZ-400S Dual Sport

It's the pedal (or the handgrip) on the right!!
Dr. Dyno is offline  
#39 (permalink) Old 01-04-2013, 07:32 PM
Advanced Member
Country: Rickl's Flag is: Canada
 
Rickl's Avatar
 
Join Date: Aug 2007
Location: Ontario
Posts: 1,151
Thanks: 7
Thanked 88 Times in 74 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quote:
Originally Posted by Dr. Dyno View Post
On the ABS not working, what I found on both the RAV4 and my old '94 Accord was that below a certain very slow speed that I don't remember, applying the brakes resulted in them working but w/o ABS. Some readers misread it as saying the brakes didn't work at all. Above that speed ABS worked all the way to 0 mph.
I had never considered that, but it does explain the people who say that their brakes pulsed all the way to a stop. They simply stomped on the pedal above 12 MPH and never let up on it.

In a previous vehicle with ABS, but not DAC, I began driving down a steep, ice covered, cottage road with drop offs on each side. Each time I stepped on the brakes they locked up and I slid towards the sides. I was forced to release and reapply the brakes to avoid sliding sideways. This caused my speed to increase, but I had made a choice to risk hitting a tree at the end of the road rather than rolling sideways down the embankment. Fortunately the last few feet of road were level and I was able to stop without hitting the tree.

I have tried similar roads with my RAV, using DAC, and was able to maintain complete steering control , while maintaining a safe speed, without touching the brakes.

Rick L Ontario Canada
2008 Silver RAV4 Limited V6 4WD
Rickl is offline  
#40 (permalink) Old 01-04-2013, 10:32 PM
DVS
Advanced Member
Country: DVS's Flag is: United States
 
DVS's Avatar
 
Join Date: Nov 2012
Location: Midwest
Posts: 742
Thanks: 88
Thanked 104 Times in 89 Posts
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Is it true that the Downhill Assist Control (DAC) only works when you first put the vehicle into low gear, then push the DAC button?

Or will it work if the transmission is in regular "D"rive mode?

Thanks.

Silver 2012 RAV4 Limited V6 4WD with Tow Prep and OEM Hitch.

Long live the RAV4 V6!
DVS is offline  
Reply

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome