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Unread 02-12-2008, 10:08 PM   #5251
EJames1226
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Originally Posted by dwedeking View Post
It's just the flu talking, take some meds, get better and you'll feel more in the mood to hammer it out (literally if that's what it takes) to get out there
Ill need more than a hammer to come up with money to fix my tranny/clutch/get me to tds/aford to live.

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Unread 02-12-2008, 10:11 PM   #5252
dwedeking
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Yea, money issues I'm little help with. Thought you were just getting down on doing the work and stuff in time.
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Unread 02-12-2008, 10:24 PM   #5253
jbolty
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Quote:
Originally Posted by dwedeking View Post
I have a question that some of you more experienced jeepers hopefully can answer. I'm trying to understand the physics/dynamics of a 4x4 vehicle vs dirt bikes/buggies.

Question:

When driving our jeep in deep sand and a steep hill (ie Blowsand or Oldsmobile Hill in Glamis) I do poorly in 4HI. By putting the Transfer in 4Lo I am able to motor up no problem although at a slow overall speed. When doing this buggies or bikes more speed is better (if you fail, you just back up and get a longer run at it). With the jeep in 4Lo I'll actually cruise through the whoops at the bottom of the hill and then floor it to climb.

Why do the two seemingly oppossing techniques work with the two different types of vehicles?

Just a guess but I still think speed is the key to keeping moving in sand. I would guess that in 4HI there is such a drag on the wheels that there is not enough torque to stay moving. 4LO is not actually slower because the vehicle is actually able to keep going.
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Unread 02-12-2008, 10:31 PM   #5254
JayRock
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Quote:
Originally Posted by dwedeking View Post
I have a question that some of you more experienced jeepers hopefully can answer. I'm trying to understand the physics/dynamics of a 4x4 vehicle vs dirt bikes/buggies.

Question:

When driving our jeep in deep sand and a steep hill (ie Blowsand or Oldsmobile Hill in Glamis) I do poorly in 4HI. By putting the Transfer in 4Lo I am able to motor up no problem although at a slow overall speed. When doing this buggies or bikes more speed is better (if you fail, you just back up and get a longer run at it). With the jeep in 4Lo I'll actually cruise through the whoops at the bottom of the hill and then floor it to climb.

Why do the two seemingly oppossing techniques work with the two different types of vehicles?
Jeeps defy all laws of reason and understanding

Hey guys just checking in, I can't log at work, they figure out the proxy blockers as fast as I can find them. That's about the only time I get. still read up though. Eric man, your jeep sounds pretty bad.
Ok I'll be watching

Anyone planning on running a day trip next weekend? 23-24ish??
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Unread 02-12-2008, 10:37 PM   #5255
dwedeking
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Quote:
Originally Posted by jbolty View Post
Just a guess but I still think speed is the key to keeping moving in sand. I would guess that in 4HI there is such a drag on the wheels that there is not enough torque to stay moving. 4LO is not actually slower because the vehicle is actually able to keep going.
Maybe slower was a poor choice of words. When attempting to climb in 4HI on a sand hill, I will start out at a higher rate of speed (which is really interesting for the wife if I mis-time the last whoop ) and then slow and dig in. Doing the same climb in 4 LO I will start out at a slower speed than the 4HI and then it will lower to a constant speed and just consistantly crawl to the top. Maybe the explanation is the same, I just thought I would clarify what I was saying.
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Unread 02-12-2008, 10:38 PM   #5256
jbolty
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Jeeps defy all laws of reason and understanding

Hey guys just checking in, I can't log at work, they figure out the proxy blockers as fast as I can find them. That's about the only time I get. still read up though. Eric man, your jeep sounds pretty bad.
Ok I'll be watching

Anyone planning on running a day trip next weekend? 23-24ish??
Maybe. I have some company next week but they are supposed to leave on 2/22.
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Unread 02-12-2008, 10:42 PM   #5257
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Quote:
Originally Posted by dwedeking View Post
Maybe slower was a poor choice of words. When attempting to climb in 4HI on a sand hill, I will start out at a higher rate of speed (which is really interesting for the wife if I mis-time the last whoop ) and then slow and dig in. Doing the same climb in 4 LO I will start out at a slower speed than the 4HI and then it will lower to a constant speed and just consistantly crawl to the top. Maybe the explanation is the same, I just thought I would clarify what I was saying.
Makes sense. I just think that in HI it bogs down too much. I see some of the guys with the v8 jeeps and blazers power up and over. Of course they have bigger tires too. I guess we will have to test it. Lo might make for less chance of wheel spin too. But, either way if you stop or slow too much you are done.

On the next Mythbusters.
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Unread 02-13-2008, 12:00 AM   #5258
Jeebs
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I made only a few payments on my old truck ('03 2500 Hemi) I was talking about above. Equity from another house I sold paid it off ~4 years early. Plus, it was mine - not my company's.
I don't know... I kinda like this arrangement.

I have a $40,000 truck that I paid nothing for, I have a gas card to use at my leisure, I drive it just like I would my own; errands, picking Steve up, etc. Plus if I damage anything or it needs service I take it in and thats paid for too! The only downside is that it has Sprint plastered all over it.
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Unread 02-13-2008, 12:13 AM   #5259
EJames1226
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Jason can i borrow your truck as a school project?
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Unread 02-13-2008, 01:34 AM   #5260
Joe Dillard
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Jason, I understand having something at your disposal that basically costs you nothing out of pocket. No insurance, no maintenance, no fuel etc. You use it as you need and Sprint pays for it. It's a good deal for you.

I sold Nissans and Fords for ~2 years (back in the early 80's) and drove demo's for those 2 years. They were 100% free to me. I simply picked out any car/truck on the lot every ~3 months. Nice arraingement and similar to yours.
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Unread 02-13-2008, 01:52 AM   #5261
1990JEEPXJ
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Quote:
Originally Posted by dwedeking View Post
Maybe slower was a poor choice of words. When attempting to climb in 4HI on a sand hill, I will start out at a higher rate of speed (which is really interesting for the wife if I mis-time the last whoop ) and then slow and dig in. Doing the same climb in 4 LO I will start out at a slower speed than the 4HI and then it will lower to a constant speed and just consistantly crawl to the top. Maybe the explanation is the same, I just thought I would clarify what I was saying.
like jbolty is saying, i have always found speed is the key. for me personally, and ive heard this from many others, that 4lo is too much torque for the sand. i can vouch for this. haha. but when i go in the dunes im always in 4hi and on the throttle so i keep the RPM's up a little more.
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Yea, and I thought it was one of the 11 Commandments:
11) Thou shalt love, cherish, and honor till death, thine square headlights above all other earthy things sayith the Lord.
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Unread 02-13-2008, 08:23 AM   #5262
jbolty
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like jbolty is saying, i have always found speed is the key. for me personally, and ive heard this from many others, that 4lo is too much torque for the sand. i can vouch for this. haha. but when i go in the dunes im always in 4hi and on the throttle so i keep the RPM's up a little more.
We will test this using scientific methods on a real dune. and a giant treadmill.
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Unread 02-13-2008, 09:42 AM   #5263
Jeebs
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Quote:
Originally Posted by Joe Dillard View Post
I sold Nissans and Fords for ~2 years (back in the early 80's) and drove demo's for those 2 years. They were 100% free to me. I simply picked out any car/truck on the lot every ~3 months. Nice arraingement and similar to yours.
Nice! Isn't free great!

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- Let me know if you are going to need my parking services. Disclaimer: They may be considerably dirtier when you return.
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Unread 02-13-2008, 09:43 AM   #5264
dwedeking
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Quote:
Lo might make for less chance of wheel spin too.
I think this may be key. As your climbing the hill in 4HI your keeping a certain number of revolutions of wheels per second/minute/mile/whatever and a certain amount of forward momentum. As the steepness of the hill increases your forward momentum slows but your number of wheel revolutions stays constant causing you to dig. 4LO keeps this from happening as much because your slower wheel revolution delays that digging effect

Just a theory.

On sand in general I understand the need to keep momentum up to "float" over the surface and not allow the weight of the vehicle to bog down. While speed plays a part, momentum is key. Planning your route 2 or 3 dunes ahead, making wider turns, planning on where you start and stop are all keys to keep moving across open dunes.
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Unread 02-13-2008, 09:52 AM   #5265
jbolty
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Quote:
Originally Posted by dwedeking View Post
I think this may be key. As your climbing the hill in 4HI your keeping a certain number of revolutions of wheels per second/minute/mile/whatever and a certain amount of forward momentum. As the steepness of the hill increases your forward momentum slows but your number of wheel revolutions stays constant causing you to dig. 4LO keeps this from happening as much because your slower wheel revolution delays that digging effect

Just a theory.

On sand in general I understand the need to keep momentum up to "float" over the surface and not allow the weight of the vehicle to bog down. While speed plays a part, momentum is key. Planning your route 2 or 3 dunes ahead, making wider turns, planning on where you start and stop are all keys to keep moving across open dunes.


Exactly, momentum is really king; buggys don't need it so much because they are light. If you are in hi you might be floored but only going 20 mph because of the drag but if you lose traction the wheels will spin up to speed pretty quickly and dig in.


btw, how do you feel.?
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Last edited by jbolty; 02-13-2008 at 10:12 AM..
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