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Minimal Off road Jimny Rig

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03 Aug 2020 21:19 #226047 by Tom Bacon
Hello Everyone

I have a 2003 JB43 stock Jimny. I am thinking of installing either 33s or 35 inch mud tyres. Which components need uprating/adjusting? What suspension and or body lift should I go with? What are the bare essential mods to install?

All the best

Tom

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03 Aug 2020 21:37 #226049 by sniper
Replied by sniper on topic Minimal Off road Jimny Rig
About 2.5-3k worth of drivetrain parts.......

sniper

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03 Aug 2020 21:53 #226052 by Lambert
Replied by Lambert on topic Minimal Off road Jimny Rig
Welcome to the forum. You have 2 basic options for making the wheels fit. First is a huge lift of suspension and also the body. Second is to get busy with the angle grinder and hack huge lumps out of the body. Neither is what you might call a particularly easy option. Having got the wheels under it regardless of how, you will need to correct the gearing with some combination of transfer box and differential gear set swap which is again not entirely straightforward also with such big heavy wheels and tyres you are going to need to truss the actual axle tubes as they will snap the welds at the pumpkin/tube joint either that or find something like a set of heavier axles off a bigger vehicle.

Whatever you decide on doing can we have pictures and a brief build thread we love those, please?

Dreadnaught (black 2011)
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03 Aug 2020 22:10 #226054 by X8GGY
Replied by X8GGY on topic Minimal Off road Jimny Rig

Wandered off for a bit... you'll find me in the garage building a Jimny Buggy ;)
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03 Aug 2020 22:20 #226055 by X8GGY
Replied by X8GGY on topic Minimal Off road Jimny Rig
I did 35"s on a Vitara back in the day...


Wandered off for a bit... you'll find me in the garage building a Jimny Buggy ;)
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06 Aug 2020 17:15 #226142 by Tom Bacon
Thanks for the feedback guys. Would 31 inch tyres avoid having to uprate axles, transfer case, diffs and other bits?

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06 Aug 2020 18:21 #226150 by Lambert
Replied by Lambert on topic Minimal Off road Jimny Rig
Yes and no. The biggest tyre with stock drivetrain is a 235.75r15 but it will need a lift. After that any bigger will need some kind of regear. Without a lift 215.75r15 will fit without a lift. Realistically a stock Jimny on stock size tyres suitable for the prevailing terrain will drive over round or through 90pc of the conditions likely to be found in the UK. It just won't look like it should.

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06 Aug 2020 19:26 #226161 by CC Baxter
"It just won't look like it should" says it all really. The Jimnys biggest failing would appear to be it just doesn't look rugged enough. Chris

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06 Aug 2020 22:03 #226180 by Tom Bacon
What kind of gear reduction kit would work best for 31s?

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06 Aug 2020 22:53 - 06 Aug 2020 22:54 #226182 by Busta
Replied by Busta on topic Minimal Off road Jimny Rig

Tom Bacon wrote: What kind of gear reduction kit would work best for 31s?


A rocklobster is best. But before you go down the modification rabbit hole you should be aware there are several approaches to modifying a car.

You can relatively easily fit 31s with a cheap lift kit, a bit of trimming and no modifications to the drivetrain and have an "off-road ready" Jimny in a weekend, looking cool on its tall suspension and big tyres. Plenty of people do this. They then realise it's terrible to drive on the road, they drive it off-road a few times, burn out a few clutches, break a few CVs, get cross-axled on every other bump and get fed up so they move on something heavy and diesel.

Or you can do a bit of research, ask around for advice, and build one properly with appropriately sized tyres, good quality suspension, the correct gearing to suit the tyres and up-rated parts where needed. This costs a lot more and takes time, but the result is a reliable and capable off-roader that can still be driven on the road and will outperform almost anything in the mud.

Of you can stick a decent set of tyres on an otherwise standard Jimny, accept it won't be the ultimate off-roader in deep ruts or impress the kids outside Macdonalds, but simply enjoy it for what it is. Which is a small, capable 4x4 that can go everywhere you'll ever need to go and lots of places you don't.

Choose which path you want to take now to avoid expense and disappointment later!
Last edit: 06 Aug 2020 22:54 by Busta.

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06 Aug 2020 23:26 - 06 Aug 2020 23:28 #226184 by Scimike
Replied by Scimike on topic Minimal Off road Jimny Rig
Some sound advice.
By far the biggest improvement you can make is stick some good standard size MT or AT tyres on a bog standard Jimny and just enjoy it. You will be surprised just how far this will get you.
If you want to go that extra distance the cost will spiral as indicated, and it's no guarantee you will.

But plenty do and it's your Jimny to enjoy, so if you want that's good enough so long as you are happy to spend.
Last edit: 06 Aug 2020 23:28 by Scimike.

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07 Aug 2020 08:27 #226195 by kirkynut
Replied by kirkynut on topic Minimal Off road Jimny Rig
Even on 235.75.15's I believe that you need gear reduction. I have this sized tyres and a rocklobster transfer box and would not be without it.

I've run 215.80.15's on standard gearing and it wasn't great.

Kirkynut

The underdog often starts the fight, and occasionally the upper dog deserves to win - Edgar Watson Howe.

My Jimny Thread Here: www.bigjimny.com/index.php/forum/8-my-ji...on-continues?start=0

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