Reply
 
Thread Tools Display Modes
 
Old 06-06-2012, 09:45 PM   #1
Senior Member
 
Advanturetrek's Avatar
 
Join Date: Nov 2010
Posts: 233
Washboard Driving

Seeking advice on best driving techniques and gear for washboard. Just had a few bad days of it. Hoping for better.
The SMB can mechanically do washboard just fine. But, at any speed, the van interior and Aluminess racks rattle horribly. We had to go 5-10 mph to keep the rattles tolerable. Regular cars were passing us going 30-50 mph.

We've got Old Man Emu Shocks, and our gear is well tied-down.
Didn't air down because we're not sure what pressure to aim for, based on the weight of the van and the tire type. What is the best way to get that information?
How much does airing down help with washboard?
Any other driving techniques or gear to consider?
__________________

__________________
The Yeti: SMB 4x4 Ford EB, super camper top, RVI interior build
http://www.advanturetrek.com
http://www.facebook.com/AdvantureTrek
Advanturetrek is offline   Reply With Quote
Old 06-06-2012, 10:20 PM   #2
Senior Member
 
Join Date: Apr 2007
Location: Fruita, Colorado
Posts: 1,173
Re: Washboard Driving

Airing down helps tremendously!!! However, there is a fine line of running too low of an air pressure on these heavy vehicles, especially at speed.
__________________

__________________
Desert Solitaire
2003 7.3L EB 4x4
Denver Fleet 4x4 conversion
saline is offline   Reply With Quote
Old 06-06-2012, 10:32 PM   #3
Senior Member
 
BajaSportsmobile's Avatar
 
Join Date: Sep 2011
Location: Rancho Nuevo (Cabo/Todos Santos) B.C.S. and San Diego, CA
Posts: 1,952
Re: Washboard Driving

Set your tires at 25 Psi and you will be much happier.
__________________
Four time Baja 1000 winner, four time Baja 500 winner. Solo'ed the Baja 1000 to LaPaz/Cabo twice.
4-Wheeling since 1972, Desert Racing since 1989.

AgileOffRoad.com
BajaSportsmobile is offline   Reply With Quote
Old 06-06-2012, 10:37 PM   #4
Senior Member
 
Nomadcat's Avatar
 
Join Date: Nov 2009
Location: Greenwich Village, NYC
Posts: 567
Re: Washboard Driving

There is the tried-and-true "5 or 50" rule, but 50 on washboard is a lot scarier in my van than it used to be in my Tacoma or the Wagoneer.
__________________
2009 E350 5.4 Quadvan Homebrew
One day at a time
Nomadcat is offline   Reply With Quote
Old 06-07-2012, 06:35 AM   #5
Senior Member
 
Join Date: Apr 2007
Location: Pasadena, CA
Posts: 785
Re: Washboard Driving

Washboard roads are always going to be uncomfortable in an SMB.

My optimal setup for "least unpleasant" washboard driving includes:

1. Air down to 35-40psi
2. Put transfer case into low range
3. Engage 4x4

Good luck
R
__________________
2006 SMB 4x4, EB-51, 6.0psd
EMrider is offline   Reply With Quote
Old 06-07-2012, 08:18 AM   #6
Senior Member
 
yvrr's Avatar
 
Join Date: Oct 2007
Location: Newark, CA
Posts: 795
Re: Washboard Driving

Our rule of thumb is 35/35. Air down to 35 psi and drive 35 mph. We have a Hella tire pressure monitoring system which is turned off when I air down (otherwise, it will continually beep) but I stop and check the tire temperatures on a regular basis.

Tire size is also a factor. If the washboard condition has been created by cars with smaller tires, larger tires let you get up "on top" of the ridges somewhat.
__________________
Jack
'01 Ford EB50p Quigley 4WD
yvrr is offline   Reply With Quote
Old 06-07-2012, 12:51 PM   #7
Senior Member
 
geoffff's Avatar
 
Join Date: Apr 2007
Location: Seattle, WA
Posts: 926
Re: Washboard Driving

I wouldn't go into 4x4 low -- you won't be able to drive fast enough to "float" over the bumps.

Like many people here, I air down and drive fast. Still the experience can be unpleasant to terrible depending on the intensity of washboarding. My pattern is:

Tires: 30-35 PSI
Speed: 35-50 MPH

Yes, 40 MPH will seem scary fast. But slower than that, the bumps get worse.

I also usually stay in 4x4 (high). This helps during the uphill sections.

I often spend a lot of time studying the road looking for the smoothest track. This is usually way off to the side -- but here you are in danger of hitting stray rocks or veering off the road. And, staring at the road all the time like this means you aren't enjoying the scenery.

If the road gets too horrible, I immediately drop down to 10 MPH.

-- Geoff
__________________
2004 Ford, SMB 4x4, RB-50
http://octopup.org/sportsmobile
geoffff is offline   Reply With Quote
Old 06-07-2012, 04:42 PM   #8
Site Team
 
macmcintire's Avatar
 
Join Date: Jan 2010
Location: Las Vegas, Nevada
Posts: 1,488
Re: Washboard Driving

In addition to all of the above, I drive on the left side of the road. I don't know why that works, but it always seems to be smoother on the opposite side of the road. This of course, doesn't work on busy dirt roads.
__________________
Mac McIntire
2002 Ford E250, 5.4L V8, RB-50 (AdVANture)
4x2, Action Van Ultimate Suspension System, 4 1/2" lift
Dana Spicer Gear, ARB Full Air Locking Differential
285/70R17 Big Foot A/T tires
Aluminess Bumpers F/R, Bushwhacker fender flares
Smittybilt XRC 12 Winch
2014 Chaser Adventure Off-Road Trailer
macmcintire is offline   Reply With Quote
Old 06-07-2012, 04:57 PM   #9
Senior Member
 
geoffff's Avatar
 
Join Date: Apr 2007
Location: Seattle, WA
Posts: 926
Re: Washboard Driving

Quote:
Originally Posted by macmcintire
In addition to all of the above, I drive on the left side of the road. I don't know why that works, but it always seems to be smoother on the opposite side of the road. This of course, doesn't work on busy dirt roads.
Now that you mention it, I have noticed that too. Apart from hills (where the uphill side is worse because of traction issues), I thought it was just my imagination (grass is greener etc.), but now that I think about it, the washboard bumps themselves may not be symmetrical so hitting them the opposite way could feel different. If you believe simulations like this, the bumps are in fact asymmetrical -- they ramp up, and then drop off to start ramping up to the next bump.



-- Geoff
__________________
2004 Ford, SMB 4x4, RB-50
http://octopup.org/sportsmobile
geoffff is offline   Reply With Quote
Old 06-09-2012, 11:33 PM   #10
Site Team
 
daveb's Avatar
 
Join Date: May 2007
Location: Turlock Ca
Posts: 9,806
Garage
Re: Washboard Driving

I'd say my Deaver springs have made as much difference as airing down to 40PSI. Also disconnecting the front sway bar helps a bit.
__________________

__________________
2006 Ford 6.0PSD EB-50/E-PH SMB 4X4 Rock Crawler Trailer

Sportsmobile 4X4 Adventures..........On and off road adventures
daveb is offline   Reply With Quote
Reply

Thread Tools
Display Modes

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 Off
Pingbacks are Off
Refbacks are Off

Powered by vBadvanced CMPS v3.2.3
Disclaimer:

This website is not affiliated with or endorsed by Sportsmobile SIP or any of its affiliates. This is an independent, unofficial site.


All times are GMT -6. The time now is 06:09 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2019, vBulletin Solutions, Inc.