BajaNomad
Not logged in [Login - Register]
Go To Bottom

Printable Version  
 Pages:  1  2  
Author: Subject: Why lowering tire air pressure really works
willardguy
Elite Nomad
******




Posts: 5660
Registered: 9-19-2009
Location: rosarito
Member Is Offline

Mood: im good

[*] posted on 10-9-2018 at 05:29 PM


guru of offroading= harald
guru of trailriding = larry
gracias to both:yes:
View user's profile
woody with a view
PITA Nomad
********




Posts: 15877
Registered: 11-8-2004
Location: Looking at the Coronado Islands
Member Is Offline

Mood: Everchangin'

[*] posted on 10-9-2018 at 06:23 PM


4lo and 10 psi should get any self respecting trail blazer out of 95% of trouble.



View user's profile
4x4abc
Super Nomad
****


Avatar


Posts: 1355
Registered: 4-24-2009
Location: La Paz, BCS
Member Is Offline

Mood: happy - always

[*] posted on 10-9-2018 at 07:11 PM


Quote: Originally posted by woody with a view  
4lo and 10 psi should get any self respecting trail blazer out of 95% of trouble.


the purpose of 4x4 is to avoid trouble.

I had a government agency some years ago that wanted multi day recovery training for their employees.
I convinced them to divide the training into avoiding to get stuck first and then what to do after you effed up.


[Edited on 10-10-2018 by 4x4abc]




Harald Pietschmann
View user's profile Visit user's homepage
4x4abc
Super Nomad
****


Avatar


Posts: 1355
Registered: 4-24-2009
Location: La Paz, BCS
Member Is Offline

Mood: happy - always

[*] posted on 10-9-2018 at 07:19 PM


here is a word on pressure gauge accuracy.

A gauge that goes up to 100 psi will give you very little accuracy between 0 and 20
A gauge that goes up to 60 psi will give you very little accuracy between 0 and 10

For serious Baja travelers a 0-30 gauge is a must. Most will need 2 gauges then.

A word of caution - if your tires are at 35 psi and you use your 0-30 gauge, it will die instantly. Done that a few times.
For 5 psi at Malarrimo a precision gauge is a must.






Harald Pietschmann
View user's profile Visit user's homepage
JZ
Ultra Nomad
*****


Avatar


Posts: 2496
Registered: 10-3-2003
Member Is Online


[*] posted on 10-9-2018 at 07:35 PM


Quote: Originally posted by 4x4abc  
here is a word on pressure gauge accuracy.

A gauge that goes up to 100 psi will give you very little accuracy between 0 and 20
A gauge that goes up to 60 psi will give you very little accuracy between 0 and 10

For serious Baja travelers a 0-30 gauge is a must. Most will need 2 gauges then.

A word of caution - if your tires are at 35 psi and you use your 0-30 gauge, it will die instantly. Done that a few times.
For 5 psi at Malarrimo a precision gauge is a must.




A good digital gauge that goes 0 to 80 is a must. That plus the gauge on your dash board is the winning combo.



[Edited on 10-13-2018 by JZ]




See Baja California in 4K: https://youtu.be/4VNTIhRa6q0

Ever wanted to camp on a deserted island in the Sea of Cortez? https://youtu.be/g3ThXCm3XSA



View user's profile
advrider
Nomad
**




Posts: 317
Registered: 10-2-2015
Member Is Offline


[*] posted on 10-9-2018 at 07:43 PM


In the rocks I run 6-10 on my jeep and it works good, with bead locks! Less air is your friend..
View user's profile
PaulW
Super Nomad
****




Posts: 1375
Registered: 5-21-2013
Member Is Offline


[*] posted on 10-10-2018 at 08:55 AM


Excellent


Quote: Originally posted by 4x4abc  
here is everything you need to know about airing down (start with the driver)

http://4x4abc.com/jeep101/soft-sand-deflate.html
http://4x4abc.com/jeep101/soft-sand-turn-straight.html
http://4x4abc.com/jeep101/soft-sand.html
View user's profile
PaulW
Super Nomad
****




Posts: 1375
Registered: 5-21-2013
Member Is Offline


[*] posted on 10-10-2018 at 09:08 AM


My latest mud venture I used 4lo and 2nd gear. Very low throttle setting and it worked. Extra throttle and all I got was tire spinning. A special circumstance due to the deep mud.
Harald, I was running 20psi. Should I have been lower or go up to 32?
I was not about to change the pressure due to the great difficulty and horrible mess. No way to plan ahead in this case.
View user's profile
4x4abc
Super Nomad
****


Avatar


Posts: 1355
Registered: 4-24-2009
Location: La Paz, BCS
Member Is Offline

Mood: happy - always

[*] posted on 10-10-2018 at 09:40 AM


messy hands are cheaper than a tow truck
get out and air down!
airing up and down in a 4x4 is the most important tool/technique of all
all the "tools" you hang on the outside of your vehicle show that you are full of air

and yes, in mud I would definitely have run (or aired down to) 10 psi or less
just enough gas to get the car moving
all lockers, if you have them (no 4x4 should be without lockers)

if 10 psi still give you slipping tires go to 5 psi

2nd gear low range is old English Voodoo
it accomplishes nothing
in terms of power to the wheels it is equivalent to 1st gear high range (can vary wildly with make of truck)
but 2nd low was a better choice than 1st low




Harald Pietschmann
View user's profile Visit user's homepage
DawnPatrol
Nomad
**


Avatar


Posts: 295
Registered: 11-19-2013
Member Is Offline


[*] posted on 10-10-2018 at 06:15 PM


Harold;
I have a F250 SuperDuty 4x4 diesel. I have LT 265/70 's Load rated E rated to 80#
I usually run them around town at 60

How low should I go on dirt trails that are a mix of sand and dirt?

Thanks
Alan in San Diego
View user's profile
JZ
Ultra Nomad
*****


Avatar


Posts: 2496
Registered: 10-3-2003
Member Is Online


[*] posted on 10-10-2018 at 06:32 PM


Quote: Originally posted by DawnPatrol  
Harold;
I have a F250 SuperDuty 4x4 diesel. I have LT 265/70 's Load rated E rated to 80#
I usually run them around town at 60

How low should I go on dirt trails that are a mix of sand and dirt?

Thanks
Alan in San Diego


35. It will make a world of difference.

Put some good shocks on it too. Kings have been awesome for me. I snapped 2 of the stock shocks in half.





[Edited on 10-11-2018 by JZ]




See Baja California in 4K: https://youtu.be/4VNTIhRa6q0

Ever wanted to camp on a deserted island in the Sea of Cortez? https://youtu.be/g3ThXCm3XSA



View user's profile
4x4abc
Super Nomad
****


Avatar


Posts: 1355
Registered: 4-24-2009
Location: La Paz, BCS
Member Is Offline

Mood: happy - always

[*] posted on 10-10-2018 at 07:39 PM


Quote: Originally posted by DawnPatrol  
Harold;
I have a F250 SuperDuty 4x4 diesel. I have LT 265/70 's Load rated E rated to 80#
I usually run them around town at 60

How low should I go on dirt trails that are a mix of sand and dirt?

Thanks
Alan in San Diego


every truck and every tire is different
to apply the1/3 rule (above) you need to find your true "normal" pressure
the one you run around town
run the chalk line test first, that will give you normal pressure
many examples on youtube - https://www.youtube.com/results?search_query=tire+chalk+line...
that test is done in 10 minutes (200 ft are sufficient to see the wear pattern)

you will have to establish "normal" for loaded and empty bed

for long fast freeway trips add 10 to 15 psi
for off-road follow the 1/3 rule

let us know what you find out




Harald Pietschmann
View user's profile Visit user's homepage
JZ
Ultra Nomad
*****


Avatar


Posts: 2496
Registered: 10-3-2003
Member Is Online


[*] posted on 10-10-2018 at 07:48 PM


35



See Baja California in 4K: https://youtu.be/4VNTIhRa6q0

Ever wanted to camp on a deserted island in the Sea of Cortez? https://youtu.be/g3ThXCm3XSA



View user's profile
4x4abc
Super Nomad
****


Avatar


Posts: 1355
Registered: 4-24-2009
Location: La Paz, BCS
Member Is Offline

Mood: happy - always

[*] posted on 10-10-2018 at 08:09 PM


Quote: Originally posted by JZ  
35


front and rear? I doubt it.




Harald Pietschmann
View user's profile Visit user's homepage
DawnPatrol
Nomad
**


Avatar


Posts: 295
Registered: 11-19-2013
Member Is Offline


[*] posted on 10-10-2018 at 08:49 PM


Quote: Originally posted by 4x4abc  
Quote: Originally posted by DawnPatrol  
Harold;
I have a F250 SuperDuty 4x4 diesel. I have LT 265/70 's Load rated E rated to 80#
I usually run them around town at 60

How low should I go on dirt trails that are a mix of sand and dirt?

Thanks
Alan in San Diego


every truck and every tire is different
to apply the1/3 rule (above) you need to find your true "normal" pressure
the one you run around town
run the chalk line test first, that will give you normal pressure
many examples on youtube - https://www.youtube.com/results?search_query=tire+chalk+line...
that test is done in 10 minutes (200 ft are sufficient to see the wear pattern)

you will have to establish "normal" for loaded and empty bed

for long fast freeway trips add 10 to 15 psi
for off-road follow the 1/3 rule

let us know what you find out


OK I will try it out and let you know. I agree my truck bounces a bunch with no load, rides like a dream when loaded (thats at the 60#)

Harald... sorry for the misspell!



[Edited on 10-11-2018 by DawnPatrol]
View user's profile
bajatrailrider
Super Nomad
****




Posts: 1155
Registered: 1-24-2015
Location: Mexico
Member Is Offline

Mood: Happy

[*] posted on 10-11-2018 at 04:33 PM


JZ you and bikers will get a kick out of this. Years ago two of us on 87 CR500 67hp. Where riding in a group of my brothers friends we did not know they where factory Honda riders. All riding Xr250s built so they had a hill climb type trail. S turns no run no traction steep. The two of us on Cr500s already only had 6 psi in the tires. No worry we where thinking the little XRs are no match for our smokers. Well 6 of them went up first try. Friend hit it 5 times could not make it all little bikes at top having good jokes about the CR500s. I tried 3 times got very tired drink all my water. Told other Cr rider watch this I removed valve stem rear tire put it in pocket. Went up it blazing fast made the Xr riders run for cover. Other Cr rider did same right up. We pulled out our cycle pump put valve stem back up 6psi and away we went.
View user's profile
norte
Senior Nomad
***




Posts: 947
Registered: 10-8-2008
Member Is Offline


[*] posted on 10-11-2018 at 04:45 PM


Quote: Originally posted by bajatrailrider  
JZ you and bikers will get a kick out of this. Years ago two of us on 87 CR500 67hp. Where riding in a group of my brothers friends we did not know they where factory Honda riders. All riding Xr250s built so they had a hill climb type trail. S turns no run no traction steep. The two of us on Cr500s already only had 6 psi in the tires. No worry we where thinking the little XRs are no match for our smokers. Well 6 of them went up first try. Friend hit it 5 times could not make it all little bikes at top having good jokes about the CR500s. I tried 3 times got very tired drink all my water. Told other Cr rider watch this I removed valve stem rear tire put it in pocket. Went up it blazing fast made the Xr riders run for cover. Other Cr rider did same right up. We pulled out our cycle pump put valve stem back up 6psi and away we went.


ANd the valve stem/tube did not pinch.
View user's profile
JZ
Ultra Nomad
*****


Avatar


Posts: 2496
Registered: 10-3-2003
Member Is Online


[*] posted on 10-11-2018 at 06:10 PM


Quote: Originally posted by bajatrailrider  
JZ you and bikers will get a kick out of this. Years ago two of us on 87 CR500 67hp. Where riding in a group of my brothers friends we did not know they where factory Honda riders. All riding Xr250s built so they had a hill climb type trail. S turns no run no traction steep. The two of us on Cr500s already only had 6 psi in the tires. No worry we where thinking the little XRs are no match for our smokers. Well 6 of them went up first try. Friend hit it 5 times could not make it all little bikes at top having good jokes about the CR500s. I tried 3 times got very tired drink all my water. Told other Cr rider watch this I removed valve stem rear tire put it in pocket. Went up it blazing fast made the Xr riders run for cover. Other Cr rider did same right up. We pulled out our cycle pump put valve stem back up 6psi and away we went.


Funny.

My best hill climb memory was at Jawbone off 395 North of Mojave.

Was riding a junker bike. Hit a super steep hill full speed, got to the lip and jumped off the bike. Landed on my feet and the bike flew another 20 yards or so into a big bush. Looked down at a group of friends and raised my hands in the air.

I might have had a beer or two before that.




See Baja California in 4K: https://youtu.be/4VNTIhRa6q0

Ever wanted to camp on a deserted island in the Sea of Cortez? https://youtu.be/g3ThXCm3XSA



View user's profile
bajatrailrider
Super Nomad
****




Posts: 1155
Registered: 1-24-2015
Location: Mexico
Member Is Offline

Mood: Happy

[*] posted on 10-11-2018 at 08:21 PM


Jawbone canyon yes that's is where it happened. To answer why no tube pinch with zero air. It was only a 500ft climb and we use 4mm thick tubes. With two rim locks on rim.
View user's profile
motoged
Elite Nomad
******


Avatar


Posts: 5249
Registered: 7-31-2006
Location: Kamloops, BC
Member Is Offline

Mood: Gettin' Better

[*] posted on 10-11-2018 at 08:48 PM


For my BC trail riding/single track/cross country on my 450 I have traditionally used 11-14 psi front and 10-12 psi for rocks/roots/mud/gravel and UHD tubes, and single rim locks front and back.

Doing multi-day rides w/camping gear (Giant Loop Coyote bag) in Baja I have traditionally gone to 16-20 front and about 15 +/- rear with Slimed UHD tubes.

Riding a few years ago with a few Nomads, the bike guy took me into the dunes and I struggled as that type of sand has been my bane. He suggested 8 psi front and same or lower in back....and being used to avoiding pinch flats i was hesitant. I tried 10 front and 8 back and felt the difference....and played with nothing lower than 8.

Spending a lot more time with lower psi's in the sand when I can....and have started to enjoy it.

A convert.



[Edited on 10-12-2018 by motoged]




Don't believe everything you think....
View user's profile
 Pages:  1  2  

  Go To Top

 






All Content Copyright � 1997- Q87 International; All Rights Reserved.
Powered by XMB; XMB Forum Software © 2001-2014 The XMB Group�






"If it were lush and rich, one could understand the pull, but it is fierce and hostile and sullen. The stone mountains pile up to the sky and there is little fresh water. But we know we must go back if we live, and we don't know why." - Steinbeck, Log from the Sea of Cortez

"People don't care how much you know, until they know how much you care." - Ivan R. Misner, Ph.D

"You can easily judge the character of others by how they treat those who they think can do nothing for them or to them." - Malcolm Forbes

"Let others lead small lives, but not you. Let others argue over small things, but not you. Let others cry over small hurts, but not you. Let others leave their future in someone else's hands, but not you." - Jim Rohn







Thank you to Baja Bound Mexico Insurance Services for your long-term support of the BajaNomad.com Forums site.







Emergency Baja Contacts Include:

Desert Hawks; El Rosario-based ambulance transport; Emergency #: (616) 103-0262