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Old 01-04-2010, 02:59 PM   #1 (permalink)
 
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Hi,
Im new here so hello and drinks are on me.

Just bought a 2001 jimny today for 2500, 42000 miles,fsh, drove it home 120 miles on the motorway and love it already.

Quick 2 questions can I change from 2 to 4wd while moving?and im after good winter tyres or some that can handle snow any recommendations?(on standard wheels)

Thx in advance,

Jason
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Old 01-05-2010, 12:04 AM   #2 (permalink)
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welcome to the world of Suzuki 4x4s!

No, you should NOT shift into 4x4 while at speed. It's hard on the equipment.

It is okay to disengage while moving.

In case you are not familiar with 4x4 technology, your Jimny is a part-time 4wd vehicle. It does not have a central differential or a viscus coupler like all-wheel-drive vehicles (any Subaru comes to mind) do. That means it should NEVER be driven any distance on dry surfaces in the 4wd mode! Doing so can load up the drivetrain and apply stress to components. This stress effect - called winding - will cause something expensive to break.

Trivia: I learned about "winding" while researching a British military vehicle that you may have heard of - the Alvis Stalwart. This 5-ton 6x6 amphibious munitions carrier has exactly ONE differential that distributes drive power to the left and right set of wheels. Drivers of this vehicle had to pull over regularly and drive up onto a curb to release the winding tension that builds up in the drivetrain.

The winter tyres question I will leave to one of your countrymen that may be online here. In the States, all season tires are very common. I understand that you have been experiencing more snow than normal in Britain and the local drivers are mystified by the rare appearance of the stuff. A set of all season tyres might be in short supply right now. Don't worry, though. 4wd and the gentle application of power should hold you in good stead until the weather gets better and the all season tyre shortage ends.

I hope that this helps!
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Old 01-05-2010, 12:13 PM   #3 (permalink)
 
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Hi,
Thx for the reply but I am a little confused when I google jimny 4wd and keep getting this info up.

The Jimny's vacuum-locking hubs allow the vehicle to be shifted from 2WD to 4WD while travelling at up to 100 km/h (62 mph). Shifting to low range requires the vehicle to be stopped, but there is no need to exit the vehicle. Newer Jimnys feature electronic "push-button" selectable four-wheel drive.

So I should not do this?

Also you said dont drive it in 4wd in the dry.So wet roads are ok?

Thanks in advance,

Jas
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Old 01-05-2010, 05:48 PM   #4 (permalink)
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I don't think ack saw the year of your rig. The vacuum hubs can be locked in while driving, and the transfer case is chain driven... It's still part time 4wd so I'm assuming that shifting to 4wd means that theres a clutch mechanism in the hubs? Don't know enough about the new Jimny to do anything but speculate. As for winding... if you drive on roads that your tires can slip, you should be ok. It's dry roads where you have grip and your tires can't slip that you get winding. Again, I don't know enough about the new Jimny to be sure whether or not it is susceptable to winding.

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Old 01-05-2010, 05:57 PM   #5 (permalink)
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Quote:
Originally Posted by jazon6 View Post
Hi,
Thx for the reply but I am a little confused when I google jimny 4wd and keep getting this info up.

The Jimny's vacuum-locking hubs allow the vehicle to be shifted from 2WD to 4WD while travelling at up to 100 km/h (62 mph). Shifting to low range requires the vehicle to be stopped, but there is no need to exit the vehicle. Newer Jimnys feature electronic "push-button" selectable four-wheel drive.

So I should not do this?

Also you said dont drive it in 4wd in the dry.So wet roads are ok?

Thanks in advance,

Jas

OOPS!

You have a 4wd front axle system similar to my 2002 Tracker 4-door (the equivalent to a Vitara...) The closest thing that we have to a Jimny is the SJ-413 Samurai - which has locking hubs. Sorry about that...

While you may have read that on a link found with a Google search, unless you KNOW it comes straight from the Suzuki Jimny Owner's Manual, I would not believe it!

You STILL have a part-time 4wd drivetrain. You risk breaking the coupling mechanism if you dump your treansfer case into 4wd at any appreciable highway speed while the front locking mechanism is trying to activate pneumatically. It's sort of like trying to change gears without depressing the clutch first. Lots of grinding and popping will occur.

I cannot put my Tracker/Vitara into 4wd unless I am at a complete stop. If I do, a giant shudder and pop is felt from the front differential as the pneumatically operated 4wd locking pin drops into place. Taking it out of 4wd can be done at any speed because both the input and output components are rotating at the same RPM when they separate.

I am not very familiar with the Jimny 4wd system (we in the USA, WISH WE HAD Jimnys to drive!). If it is similar to the newer Suzuki IFS front wheel drive mechanisms - which I believe it is - I would not "engage" while in motion.

Above all, read your Jimny owner's manual for the true answer to this question.

Wet roads are okay for 4x4 useage, but it is really overkill. Remember this is NOT an AWD Audi or a Subaru that you own! All-wheel drive performance at speed in rainy conditions is far superior to your part-time 4wd system - so much so that I really would not bother using your Jimny 4x4 mode in the rain except under severe, muddy conditions.

Again, your owner's manual is the best source for information on this subject.
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Last edited by ack; 01-05-2010 at 06:01 PM.
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Old 01-06-2010, 02:42 AM   #6 (permalink)
 
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Thx for replies

I dont have a manual to refer to yet so I will be careful with the 4wd for now.

Im gonna have a play in the snow today got a good 8" and its still snowing hard.

Thx again,

jason
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Old 01-06-2010, 03:46 AM   #7 (permalink)
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ack, this may be a stupid question, but when you say it can be pulled out of 4wd any speed because input and output are at same speed... wouldnt they be spinning same speed when putting it into 4wd as well, as the inputs being driven by the motor, and the outputs being pushed by the front wheels?... i dont know anything about these newer setups, but as long as the back wheels arent slipping and are spinning same speed as the fronts while in 2wd, wouldnt it be safe to engage 4wd?...
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Old 01-06-2010, 10:59 AM   #8 (permalink)
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The issue isn't so much with the two drive shafts not spinning at the same rate. It's that their gears aren't aligned to engage the transfer case. This is meant to be done at stop when the tcase can align the gears from neutral... this brings up another issue. The issue is that you are disengaging the transmission while it's driving the Transfer gears and then re-engaging it while it's still spinning (now the input at a different rate than the outputs of the transfer case) By the same token, you don't want to drop the t-case out of 2wd into neutral and then back into 2wd. If done quickly at a slow speed with your clutch in, you can jam it into 4 high and you'll hear a lound clunk and maybe just chip a few teeth. It's not good for the transfer gears, just like shifting without clutching isn't good for the transmission... it can be done though.

Last edited by Baratacus; 01-06-2010 at 11:04 AM.
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Old 01-06-2010, 11:58 AM   #9 (permalink)
 
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I tried my little jimny in the snow today and was amazed that with road tyres it drove through 8"+ of snow with ease.

I was so confident after 10 mins of pottering around, I drove in to work which is a 20 mile journey down single track country lanes.

The jimny never once gave any problems and blasted up some pretty steep hills.

Good stuff

(guess I dont need winter tyres)
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Old 01-06-2010, 03:42 PM   #10 (permalink)
 
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here she is-

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