Defender transfer case gear up 1.41. to 1.22

**85 county** · 29th May 2014, 02:34 PM

Originally Posted by simmo

Hi I have 235/85/16 tires diameter is about 806mm, 31"?, I have a about 2" of suspension lift

33" = 838 ( +3%), 35" ( +10%)

When I go over a deep gulley at an angle, my back wheels can articulate all the way up into the wheel arches and almost touch the underside of the mudgard in side. ( within a couple of millimeters). If your wheels are 2" or 4 " bigger in diameter, and wider as well, do they fit inside the wheel arched when your axle articulates? or do they rub there? simmo

lower your bumpstops

**chopper** · 29th May 2014, 07:01 PM

Isnt this like putting 235/85's on a disco ?

**simmo** · 30th May 2014, 01:26 AM

I just read a step by step instruction on how to change the transfer case done by Les and Tony I think and posted in 2007. Great piece of work, thanks very muchly. Strangely I find the links on the the net not the alro site.

**simmo** · 30th May 2014, 07:05 AM

Hi, has anyone got a tacho in 300 tdi with an R 380 ? to help verify some of the figures I'm getting off the net.

according to different sources, I get different info. (1995 300 tdi , R380, LT230 1.41, 3.54 diffs)

Ashcroft calculator says T/C ratio 1.41 ; 2520 rpm @ 60mph (100km/hr.) T/C ratio 1.21 ;2150 rpm @ 60 mph

If a defender does 2520 at 100 km /hour i don't think I need to change the ratios that's fairly relaxed revs for the engine anyhow, I rarely go over that speed. I have 31" wheels 235/85/16.

Another source says; TC; 1.41 3650 @ 60mph,

TC; 1.22 2720 @ 60 mph.

who to believe? many times on the forum Ashcroft Calculator is quoted ,so i'm guessing their figures are the most believable. Can any one back up Ashcroft figures with real life readings? Thanks if you an help. cheers simmo.

**rick130** · 30th May 2014, 07:58 AM

There no way on God's green and brown earth a Tdi is doing 3650RPM @ 100km/h.

Calculate it out yourself, easy enough to do.

**uninformed** · 30th May 2014, 08:49 AM

Originally Posted by rick130

There no way on God's green and brown earth a Tdi is doing 3650RPM @ 100km/h.

Calculate it out yourself, easy enough to do.

depends on how much oil you add

**justinc** · 30th May 2014, 04:45 PM

Originally Posted by simmo

Hi, has anyone got a tacho in 300 tdi with an R 380 ? to help verify some of the figures I'm getting off the net.

according to different sources, I get different info. (1995 300 tdi , R380, LT230 1.41, 3.54 diffs)

Ashcroft calculator says T/C ratio 1.41 ; 2520 rpm @ 60mph (100km/hr.) T/C ratio 1.21 ;2150 rpm @ 60 mph

If a defender does 2520 at 100 km /hour i don't think I need to change the ratios that's fairly relaxed revs for the engine anyhow, I rarely go over that speed. I have 31" wheels 235/85/16.

Another source says; TC; 1.41 3650 @ 60mph,

TC; 1.22 2720 @ 60 mph.

who to believe? many times on the forum Ashcroft Calculator is quoted ,so i'm guessing their figures are the most believable. Can any one back up Ashcroft figures with real life readings? Thanks if you an help. cheers simmo.

2520 is correct. 3650 would be for the 1.6:1 ratio with petrol 4 cyl fitted I reckon....?

JC

**pibby** · 30th May 2014, 06:09 PM

Defender td5 110 auto with puma transfer 1.2? Tyres 1mm diff diameter to standard.
About 2150rpm 100km/h.

I know not what you're asking exactly but I find once I go over 90km/h the main noise is the wind noise from the windscreen.

**simmo** · 30th May 2014, 08:43 PM

Thanks guys I think its about the 2500 to 2700 mark, I guy from SA with a def' says his does 2700 by his tacho, that's close enough to 2520. I'll focus on the Madman turbo installation first. Once I get that sorted, I'll move onto the transfer case. Even without with the original turbo I always felt the Def was a little under geared and often found myself reaching for the gear lever to change another gear. I read people report that the boost pressure was 15 psi at 100 km/hr, must be heavily loaded or towing my def is usually a little less than 10 at 100km/h. I have the 1.21 transfer case almost on the way, just waiting to sort the freight and pick up etc.

Thread: Defender transfer case gear up 1.41. to 1.22

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Thanks "Les " & "Tony"

RPM at 100 km/hr or 60 mph.

Revs at 100 km hr

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