Basic 4X4 Terms

offroad_maniac · 23rd September 2008, 19:41

Consider Qualis or SUMO ehich has got RWD & yes they can be driven safely above 100+ KMPH. But IMO, what ruffyrider meant to say is for a vehicle with T'case, even in 2H mode, the front drive shaft rotates. (Only free wheeling hubs are disengaged). So driving faster than 100 KMPH may put stress on T'case.

I think this may be the case with simple 2 speed T'cases. Well, this is what I can guess.

offroad_maniac · 23rd September 2008, 19:47

Quote:

Originally Posted by Samurai

In case of GV it is 53:47 split for rear/front.

My bad. Sorry for that. just trying to exlpain it in simple words. Actually now-a-days many offroaders have 4H drive ratio such that more power is given to rear wheels.

RuffRyder · 23rd September 2008, 20:05

Quote:

Originally Posted by Samurai

Why should 4x4 system maintain ratios in 2H? It is not even engaged. I thought you mentioned 2H by mistake, but you are not correcting it.

hmm..pardon my ignorance Samurai and hrag, that is what i was advised by someone i know..he may be wrong on that, which means i may be wrong on that also..i accept my error..i am sorry, pls pardon me, i will not repeat the mistake again..

Samurai, i would def not second your thought on this one as i look up to you as one of the "Jeep Gurus" in T-Bhp..

Samurai · 23rd September 2008, 21:46

I am no Jeep guru, I have owned Jeep only for 4 months.

But I do have some little understanding of 4x4 vehicles since I own couple of them. What you said kinda went against what I knew, that's all.

hrag · 23rd September 2008, 22:16

Hey sir, looks like you will ask the mods for a "falling at somebody's feet" emoticon. Your friend misinformed you - 4x4 is not an easy world to understand and therefore, one must be extremely careful in what one posts.

RuffRyder · 23rd September 2008, 22:33

Quote:

Originally Posted by hrag

Hey sir, looks like you will ask the mods for a "falling at somebody's feet" emoticon. Your friend misinformed you - 4x4 is not an easy world to understand and therefore, one must be extremely careful in what one posts.

even better would be the "shut up..enough is enough" emoticon to reply to your next reply..

abhijitaparadh · 1st December 2008, 22:17

Hi, I have almost zero knowledge about 4x4 and jeeps in general. But the other day, I had a chance to drive a Subaru AWD sedan.
So I was just wondering if 4x4 in jeeps is same/similar to AWD in sedans like Subaru and Audi?

If it is, then theoretically, can a beefed up (large rims, large tires, increased GC etc) AWD sedan perform similar to a Jeep in OTR?

DirtyDan · 2nd December 2008, 03:40

Quote:

Originally Posted by abhijitaparadh

1.) So I was just wondering if 4x4 in jeeps is same/similar to AWD in sedans like Subaru and Audi?

2.) If it is, then theoretically, can a beefed up (large rims, large tires, increased GC etc) AWD sedan perform similar to a Jeep in OTR?

1.) You can look around Google and this site to find the differences and similarities. There is plenty of info on it. I won't rehash it here.

2.) "Theoretically" yes, practically no. It's a cost thing. It is an expensive proposition to diddle with the suspension of a Suburu or an Audi to get the GC and tyres you need under you.

I wish Suburu was in India. They make good quality simple vehicles that are stone-reliable. You would think it would be a natural match, India-Suburu.

If you want to read a funny/informative/heated discussion on some of this read http://www.team-bhp.com/forum/4x4-of...odern-4wd.html

gd1418 · 2nd December 2008, 12:36

Isn't the GM Forester a Subaru variant with AWD?

randeep04 · 2nd December 2008, 14:06

Quote:

Originally Posted by .anshuman

4L = four wheel drive low ratio selected through transfer case.
4H = four wheel drive high ratio selected though transfer case.

Sorry but could't stop but mention the tractors drivetrain.

Like a Tractor has Kachua (Turtle) and Kahargosh (Hare) gears. Mostly in 2WD tractors.

Turtle being Low ratio and the Hare being High ratio. Similarly in 4WD jeeps 4H high ratio and 4L low ratio.

Regards,

Randeep

mail2vm · 2nd January 2010, 15:52

A very informative document & dicussion thread. I've been planning to take up a 4WD vehicle just to explore the difference. This has really helped.thanks to all mind masters

foby.sebastian · 19th January 2010, 00:13

That was a really informative document.

Thanks for sharing it buddy.

offroad_maniac · 19th January 2010, 00:50

Here is some more useful info regarding usage of 4WD.
sourced from one of the post by Jeep Expert Arka & Toyota Fortuner's Low range selection info from the same thread.
All credits to respective owners

AltoHoncho · 20th January 2010, 13:25

Nice write up, I have never driven a 4WD jeep/gypsy, never got a chance actually, these things are not available in showrooms or for TD :( for a very brief moment I had driven the Gurkha but couldnt explore a lot of its capabilities.

madhkris · 27th April 2011, 06:08

Jeep Gurus,
Being new to the 4x4 off-roading sport I have come across many terms which are a bit difficult to visualize without proper explanation and /or some guidance in form of pictures/ videos.
I would like to know what is:
1. Pitch
2. Roll-over angle (does it have same values as the approach and departure angles)
3. Flex vs Articulation (Are they the same terms? i.e can they be used interchangeably?)
4. CV joint
5. ECM
6. types of differentials
7. effect of lifts on steering and suspension
This is what I could think of now.
Please help me understand these terms. Also if anybody has something more to offer please add here.

23rd September 2008, 19:41	#16
offroad_maniac BHPian Join Date: Aug 2008 Location: Thane-Mumbai Posts: 492 Thanked: 154 Times	Consider Qualis or SUMO ehich has got RWD & yes they can be driven safely above 100+ KMPH. But IMO, what ruffyrider meant to say is for a vehicle with T'case, even in 2H mode, the front drive shaft rotates. (Only free wheeling hubs are disengaged). So driving faster than 100 KMPH may put stress on T'case. I think this may be the case with simple 2 speed T'cases. Well, this is what I can guess.
	() Thanks

23rd September 2008, 21:46	#19
Samurai Team-BHP Support Join Date: Jan 2005 Location: Bangalore/Udupi Posts: 25,813 Thanked: 45,439 Times View My Garage	I am no Jeep guru, I have owned Jeep only for 4 months. But I do have some little understanding of 4x4 vehicles since I own couple of them. What you said kinda went against what I knew, that's all.
	() Thanks

23rd September 2008, 22:16	#20
hrag BANNED Join Date: Nov 2004 Location: Bangalore / Madras Posts: 1,982 Thanked: 31 Times	Hey sir, looks like you will ask the mods for a "falling at somebody's feet" emoticon. Your friend misinformed you - 4x4 is not an easy world to understand and therefore, one must be extremely careful in what one posts.
	() Thanks

1st December 2008, 22:17	#22
abhijitaparadh BHPian Join Date: Dec 2005 Location: SF Bay Area Posts: 222 Thanked: 3 Times	4x4 vs AWD Hi, I have almost zero knowledge about 4x4 and jeeps in general. But the other day, I had a chance to drive a Subaru AWD sedan. So I was just wondering if 4x4 in jeeps is same/similar to AWD in sedans like Subaru and Audi? If it is, then theoretically, can a beefed up (large rims, large tires, increased GC etc) AWD sedan perform similar to a Jeep in OTR?
	() Thanks

2nd December 2008, 12:36	#24
gd1418 Senior - BHPian Join Date: May 2006 Location: Gurgaon Posts: 3,578 Thanked: 728 Times View My Garage	Isn't the GM Forester a Subaru variant with AWD?
	() Thanks

2nd January 2010, 15:52	#26
mail2vm BHPian Join Date: Nov 2006 Location: Bangalore Posts: 118 Thanked: 53 Times	A very informative document & dicussion thread. I've been planning to take up a 4WD vehicle just to explore the difference. This has really helped.thanks to all mind masters
	() Thanks

19th January 2010, 00:13	#27
foby.sebastian Senior - BHPian Join Date: Feb 2008 Location: Thrissur/Kochi Posts: 2,693 Thanked: 2,836 Times View My Garage	That was a really informative document. Thanks for sharing it buddy.
	() Thanks

19th January 2010, 00:50	#28
offroad_maniac BHPian Join Date: Aug 2008 Location: Thane-Mumbai Posts: 492 Thanked: 154 Times	Here is some more useful info regarding usage of 4WD. sourced from one of the post by Jeep Expert Arka & Toyota Fortuner's Low range selection info from the same thread. All credits to respective owners Attached Thumbnails Attached Images
	() Thanks

20th January 2010, 13:25	#29
AltoHoncho BHPian Join Date: Jul 2009 Location: Bangalore Posts: 581 Thanked: 14 Times View My Garage	Nice write up, I have never driven a 4WD jeep/gypsy, never got a chance actually, these things are not available in showrooms or for TD :( for a very brief moment I had driven the Gurkha but couldnt explore a lot of its capabilities.
	() Thanks

27th April 2011, 06:08	#30
madhkris BHPian Join Date: Mar 2010 Location: Bengalur Posts: 292 Thanked: 83 Times View My Garage	Basic 4X4 Terms Jeep Gurus, Being new to the 4x4 off-roading sport I have come across many terms which are a bit difficult to visualize without proper explanation and /or some guidance in form of pictures/ videos. I would like to know what is: 1. Pitch 2. Roll-over angle (does it have same values as the approach and departure angles) 3. Flex vs Articulation (Are they the same terms? i.e can they be used interchangeably?) 4. CV joint 5. ECM 6. types of differentials 7. effect of lifts on steering and suspension This is what I could think of now. Please help me understand these terms. Also if anybody has something more to offer please add here.
	() Thanks