BigJimnyMeet (North) 2024 (12 Jan 2024)
14th July 2024
Parkwood Nr. Leeds
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rocklobster
- Nobby22
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Nobby
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- suzuki jimny fella
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so at 50mph in 5th gear with 6.5.1 tbox with 215 80 15 tyres what rpm will i be at sorry just got a bit of coin that needs to be spent on the jimny but want to spend it on the right one THANKS GUYS
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- funkyjimny
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- 2004 jimny soft top, factory hardtop, ARB bumper
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Next option is new gearsets fitted into SJ transfer cases,Rob Storr does these in 4:1, 5:1,6:1, and 8:1 ratio's along with all the mounting hardware, speedo adaptor, rockbucket protection etc.
ORA advertise a 6.5:1 fully built box with all the mounting hardware, I cant see a 4:1 offering, maybe Rob will be along in a mo.
With 215/75/15's I wouldnt have more than a 4:1 which restricts your choice a little.
I find that with my 32" tyres and 6:1 box I can do 70mph.... but i'm doing 7000 revs so on road speed is a little undergeared and maybe a 5:1 would be a better choice for my tyres.
Some info from Rob Storr's site that may be useful to show the difference between gearsets:
www.rsmfg.co.uk
Reduction Ratio % Reduction Price
4:1 Works great with tyres up to 30†12% High - 83% Low £375.00
5:1 Well suited for 31†& 32†21% High - 128% Low £475.00
6:1 The only great gear set designed for 33†24% High - 170% Low £525.00
8:1 King of the rocks, makes you lower than a
Snakes belly 24% High - 260% Low £625.00
I think these prices are for the box only, not the mounting kit !
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- funkyjimny
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If you are looking around www.rsmfg.co.uk then look for the little 'next page' button in the bottom right and you'll find the link to the kit prices. Note that Rob Storr modifies your propshafts on an exchange service where other people use some SJ parts instead.
Gary
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- panosd
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With 5th gear on road i have 3700rpm with 100km and 4000rpm with 110km measurment made with gps.
So if you try with 215-80-15 you will have -20 km from my measurments.
Off road the 4.1 with the 31'' is very very good.
Dont forget , yes we want the 4L to be as much shorter can be but to get to the 4x4 area(greenlaning)
you will have to drive on road first.
For tire until 225-75-15 a mini rocklobster is the best option.
For 215-75-15 a 413 stock t-case is the best. I used to have my car with this combination at first and
never had any problem.
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- Nobby22
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Just out of interest, what would people say is the best tyres size for the 4:1 box in terms of road driving? Looks as if 215/80/15 is a good size, according to funkyjimny .
Nobby
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- funkyjimny
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30" tyres are about right for a 4:1 box in my experience, so 215/85/15's, 205/16's on GV wheels etc
Ive had two Rob Storr boxes and never had a problem with either of them. I also have the '2 low' kit in this box which means I can run in low box in just rear wheel drive which comes in handy from time to time - not sure ORA do this, Redacted might though.
(I also have Rob Storr panhards, steering bars, rear disc kit with transfer brake, billet wheelspacers etc)
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- Nobby22
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funkyjimny wrote: Rob Storrs prices are on his website - www.rsmfg.co.uk - remember to look for the 'next page' button in the bottom right hand corner.
30" tyres are about right for a 4:1 box in my experience, so 215/85/15's, 205/16's on GV wheels etc
Ive had two Rob Storr boxes and never had a problem with either of them. I also have the '2 low' kit in this box which means I can run in low box in just rear wheel drive which comes in handy from time to time - not sure ORA do this, Redacted might though.
(I also have Rob Storr panhards, steering bars, rear disc kit with transfer brake, billet wheelspacers etc)
Cheers funkyjimny. I have had a look at his website. A little confused on the price as he has prices for the gear sets and then the conversion. I assume its the cost of everything added up? Probably best to give him a call or email when the time comes. What part of the country is he in?
Nobby
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- funkyjimny
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He's in Leominster, notoriously hard to get hold of and pin down to delivery dates but worth it when it turns up - I'm a time served toolmaker and really think that his work is great.
Ive seen some of Redacted s work and been equally impressed with his engineering skills.
Yes his kits are priced seperatley,add up the fitting kit and the box price.
Gary
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I went with Redacted for mine as a friend recommended him, he was really helpful on the phone when I arranged for another friend to take my two donor boxes to him and for me to collect them 6-8 weeks later in Scunthorpe where he is.
He explained everything to me clearly and his kit was spot on.
It is a 4:1 box and I run agressive 215/80/15's which measure 29.75". It is perfect for that tyre size. I could do 70 mph if I wanted on a flat with no wind but my tyres are too scary for that - I might want to stop quickly!
This is the largest I've run but wouldn't want to run much bigger or I think it would start to struggle again with top speed.
Pulling away in first in high ratio is far better than the standard transfer box. I used to have to slip the clutch alot to pull out of lanes up hill onto the road.
Hope this helps too.
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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- panosd
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You gain more from 205-80-16 than the 30'' .
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- darthloachie
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on road the gearing is probably too high as it runs out of steam at about 55mph - could be the 124,000 mile engine and extra weight of the roll cage, winch, recovery equipment etc
its happiest at about 40mph so always trailer it if going a distance (its not a daily driver)
off road its fine but there is always the appeal of something lower geared to be able to fit even bigger tyres
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