Kombi box ratio's

Bone Officially Full-On Dubber

299 posts · joined Aug 2009 · 17 Jan 2013, 2:02 pm

#939493

Currently running a 1600 3 rib box in baja and would like to get a slightly taller top gear. At present it rev's at 3000rpm at 100km's with the 33' rear tyres but would ideally like 2800rpm @ 100. Really like the low 1st , 2nd gears for bush and beach but would love to knock it back a little @ 100. Is the 5 rib box gears or diff interchangeable ? Any option other than a 1800 box swap ? Have access to a 5 rib box but needs work.

13bwagon Officially Full-On Dubber

316 posts · joined Nov 2006 · 17 Jan 2013, 6:55 pm

#939520

3000 is about stock for most aircooled engines and dropping it 200 wont make any difference and will also slow down your cooling fan with 33 i would stay with your box

BUY A REAL BUG A PRE S BUG...

Bone Officially Full-On Dubber

299 posts · joined Aug 2009 · 17 Jan 2013, 7:24 pm

#939524

13bwagon wrote:3000 is about stock for most aircooled engines and dropping it 200 wont make any difference and will also slow down your cooling fan with 33 i would stay with your box

Who said anything about aircooled ! Aircooled, WHY ? 200rpm will make a difference if you are driving TO the Cape or simpson desert.

h fractals - an ever changing lifestyle

7,671 posts · joined Feb 2005 · 17 Jan 2013, 7:29 pm

#939525

throw in a taller top gear shane, if you are overall happy with it?

fractal geometry; the inner most limits of mind altering abuse

Fantasy http://seventhchronicle.com

Z = Z2 + C1/r = 1/0 = infinity

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13bwagon Officially Full-On Dubber

316 posts · joined Nov 2006 · 17 Jan 2013, 8:50 pm

#939535

WHO said you didn't have an aircooled engine ?
yeah ok if drive a baja 30,000 k's a year it would make a big difference

BUY A REAL BUG A PRE S BUG...

Bone Officially Full-On Dubber

299 posts · joined Aug 2009 · 17 Jan 2013, 9:00 pm

#939539

h wrote:throw in a taller top gear shane, if you are overall happy with it?

Paul if only it was that easy. I dont know anything about rebuilding g/box's and certainly dont have the tooling/jig to do it. If I went that way you would certainly go the full reco. Not sure on $$ figure but $2000 I guess for a stock rebuild. Hoping for Subarugears to release a entry level 5 speed for the ej22 boys and I would look at that option for sure.

dangerous 23 Windows of Awesome

5,901 posts · joined Jan 2005 · 18 Jan 2013, 4:49 pm

#939651

My maths say you should be right at about 2785-2813 now with a 33" tyre.(either 5.375 or 5.4286 diff)
If you have one of the less common "Alpine" 5.86 ratio diffs you will have about 3035rpm.

1800 bus has a taller diff, but lower 4th gear meaning rpm would be theoretically 2726rpm,
but lose your lower ratio crawl gears.

The suba gears are agreat box, but way too tall for 33" tyres.

Cheapest option would be a normal 1600 box, or rebuild with taller 0.77 albins 4th gear(if you find you have the 5.86 diff)

westi wrote:That's mad Alan.

h fractals - an ever changing lifestyle

7,671 posts · joined Feb 2005 · 18 Jan 2013, 7:01 pm

#939675

^ there you go shane 👍

fractal geometry; the inner most limits of mind altering abuse

Fantasy http://seventhchronicle.com

Z = Z2 + C1/r = 1/0 = infinity

Barrels www.barrelman.com.au

VW Workshop - aircooledgarage.com.au
allcooled.com.au

11CAB If ya got it....Baja it

4,674 posts · joined Aug 2002 · 18 Jan 2013, 7:09 pm

#939679

Try another Tacho to see what revs you are actually doing

65 Meyers Manx
68 Country Buggy (KO 367)
68 Country Buggy (KO 669)
68 Country Buggy (KO 789)
68 Country Buggy (KO 815)
68 Baja Bug
76 Baja Kombi Twincab

Bone Officially Full-On Dubber

299 posts · joined Aug 2009 · 18 Jan 2013, 11:39 pm

#939735

11CAB wrote:Try another Tacho to see what revs you are actually doing

I will check the actual tyre height first. Remember the 31's are not actually 31 inches high so math theory is not accurate. Will the number on box confirm alpine box ? Box was out of first IRS camper (68) ? which if I can remember correctly still had the large 5 stud 205 pcd. Was there such a thing ??

Subarugears Officially Full-On Dubber

236 posts · joined Dec 2011 · 19 Jan 2013, 5:55 am

#939739

dangerous wrote:The suba gears are agreat box, but way too tall for 33" tyres.

Maybe not with our new 4.86 diff ratio.... :-)

The beach buggy guys reckon the 4.44 diff ratio is perfect for 31" tyres so I reckon 4.86 should be about perfect for 33"s.

Bone if you are after an entry level box for an EJ22 I might have something that fits the bill - just getting my hands on some 4 bolt EJ22 boxes now to do a couple.

Bone Officially Full-On Dubber

299 posts · joined Aug 2009 · 19 Jan 2013, 5:56 am

#939740

dangerous wrote:My maths say you should be right at about 2785-2813 now with a 33" tyre.(either 5.375 or 5.4286 diff)
If you have one of the less common "Alpine" 5.86 ratio diffs you will have about 3035rpm.

1800 bus has a taller diff, but lower 4th gear meaning rpm would be theoretically 2726rpm,
but lose your lower ratio crawl gears.

The suba gears are agreat box, but way too tall for 33" tyres.

Cheapest option would be a normal 1600 box, or rebuild with taller 0.77 albins 4th gear(if you find you have the 5.86 diff)

Thanks Dave will have to try and find out what ratio 3 rib box is in it !

Bone Officially Full-On Dubber

299 posts · joined Aug 2009 · 19 Jan 2013, 9:53 am

#939771

Subarugears wrote:
dangerous wrote:The suba gears are agreat box, but way too tall for 33" tyres.

Maybe not with our new 4.86 diff ratio.... :-)

The beach buggy guys reckon the 4.44 diff ratio is perfect for 31" tyres so I reckon 4.86 should be about perfect for 33"s.

Bone if you are after an entry level box for an EJ22 I might have something that fits the bill - just getting my hands on some 4 bolt EJ22 boxes now to do a couple.

Sounds good !
Well as suspected the 33' tyre is not 33' but rather 32' tall with 18psi on a 8' wide rim.

Bone Officially Full-On Dubber

299 posts · joined Aug 2009 · 21 Jan 2013, 3:29 pm

#940140

Checked again and 100km's is 3000-3050rpm with the actual 32' tyre height .

11CAB If ya got it....Baja it

4,674 posts · joined Aug 2002 · 21 Jan 2013, 5:16 pm

#940150

Next question, have you GPS'd your speed? Your 100km/h on the speedo probably isn't 100km/h

65 Meyers Manx
68 Country Buggy (KO 367)
68 Country Buggy (KO 669)
68 Country Buggy (KO 789)
68 Country Buggy (KO 815)
68 Baja Bug
76 Baja Kombi Twincab

Bone Officially Full-On Dubber

299 posts · joined Aug 2009 · 21 Jan 2013, 6:06 pm

#940156

Graham, Graham why do you continue to argue with me ! Yes mate that is the GPS speed. There's the figures, you do the math and tell me the ratio ! Ps.. highly recommend EJ22's..see you at dubs.