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Home > Technical > LT230 with Ashcrooft ATB - looking for opinions

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Naks

Member Since: 27 Jan 2009
Location: Stellenbosch, ZA
Posts: 2640

2010 Defender 90 Puma 2.4 SW Alpine White

thanks Ashtrans, does the Low Range stay the same?

I'm speaking to your local distributor in Cape Town

--
2010 Defender Puma 90 + BAS remap + Alive IC + Slickshift + Ashcroft ATB rear
2015 Range Rover Sport V8 Supercharged

Defender Puma Workshop Manual: https://bit.ly/2zZ1en9
Discovery 4 Workshop Manual: https://bit.ly/2zXrtKO
Range Rover/Sport L320/L322/L494 Workshop Manual: https://bit.ly/2zc58JQ

11th Jul 2019 8:33am

ashtrans
Site Sponsor

Member Since: 08 Nov 2008
Location: Harpenden
Posts: 258

Hi,

yes, low stays as it is, Dave

15th Jul 2019 7:18am

CharlieDonuts

Member Since: 16 Jun 2019
Location: Illiers Combray
Posts: 133

2008 Defender 90 Puma 2.4 SW Galway Green

I just got my annual bonus and I am considering upgrading to a LT 230 Transfer box with the ATB option.

The recommendation from Ashcroft is. Note : Due to the nature of the ATB diff we do not recommend the vehicle is brake tested on rollers, ask for a decelerometer to be used instead.

Can someone explain to me why this is ? Is it absolutely necessary ? Or is there some way around this ?

Here where I live in France, the nearest test centre with a decelerometer is a two hours drive from here. Looking at their website they are only testing classic cars with cable brakes and they mention nothing about 4x4's. I have also checked the government regs and again no mention of 4x4's.

Naturally I will ask the test centre for a decelerometer test but I may have to explain why, and in French, and I don't really understand the reason for this is recommendation? Probably better if I have at least some idea of what I am talking about !

Frankly it would be much much easier if I ignored the recommendation and did a brake test the normal way at my local test centre on the rollers. Would that break it then ?

18th Sep 2019 7:43pm

90 Dreamer

Member Since: 13 Jul 2019
Location: Oop North
Posts: 2161

2016 Defender 90 Puma 2.2 HT Corris Grey

With a brake roller you have the potential to wind up the diffs and cause damage, not recommended IMO......

18th Sep 2019 8:26pm

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 17414

2007 Defender 110 Puma 2.4 DCPU Stornoway Grey

If all four wheels are on rollers you won't have a problem. In the UK, test stations only test one axle at a time, which is harmful since the wheels on the other axle are not rotating. This tends to destroy the standard open diff in an LT230, with an ATB there is a probability that the vehicle will fly off the rollers.

I would never allow my Defender to be tested on rollers one axle at a time. My tester uses a decelerometer.

If there really is no alternative, remove the front propshaft and lock the centre diff.

18th Sep 2019 8:41pm

LandRoverAnorak

Member Since: 17 Jul 2011
Location: Surrey
Posts: 11324

Last time I had mine tested, the station had a two axle roller for the brake test. They also had a very nice four post lift that incorporated a mechanism to rock the steering, which I'd never seen before. Darren

110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak

"You came in that thing? You're braver than I thought!" - Princess Leia

18th Sep 2019 9:15pm

CharlieDonuts

Member Since: 16 Jun 2019
Location: Illiers Combray
Posts: 133

Quote:
If all four wheels are on rollers you won't have a problem.

My local test station has four rollers

I'll still ask for the decelerometer test on the principle of that its better safe than sorry. I wonder what the French for 'transmission wind ups" is. hmmmm

You lot are blommin great, really really great, thank you.

19th Sep 2019 5:49am

MadTom

Member Since: 10 Sep 2013
Location: Olomouc
Posts: 623

No problem with standard Defender or Discovery 2 here in Czech republic, but I get a scared phone call from local test station - Freelander nicely jumped from brake test rollers and ended in some tool rack. They were surprised. Freelander has viscous coupling instead of center diff, and it was a bit tight. So nearly the same effect as ATB in center diff. The test station was "high quality" - they have not had this problem before with Freelander 2, small difference between viscous coupling and haldex is probably something magic for them.
Different story was Deffender with 3 ATBs - they had to use rollers for the other axle. Again after a small jump of car. "Drobek" = The Small One - Discovery 2, "Blufínek" = The Blue Thing - Defender 130, and for me at least Ford Mondeo

19th Sep 2019 5:14pm

CharlieDonuts

Member Since: 16 Jun 2019
Location: Illiers Combray
Posts: 133

So for the Controle Technique brake test the French stopped using the decelerometer test several years ago for all vehicles except those that can't physically get onto the rollers. I went to three test centres they all had additional free roiling rollers for brake testing 4x4's. They said that because there are so many different types of transmission available it's not possible to know exactly how every transmission works. So they test all 4x4 the same way with two independent drive rollers and two free rollers. One of the three test centres had an ex Land Rover mechanic so I will take it in there. Once again thank you for the excellent advice guys

30th Sep 2019 7:19pm

Dwerkz

Member Since: 12 Jul 2019
Location: Amsterdam
Posts: 11

ashtrans wrote:
Hi,

yes, many customers have, works very well with a tuned TDCi,

Tried to get the math out of the calculator ,but was not able to get the answer.
Would the 1:1 LT230 ratio work whit 18 inch wheels,tuned Tdci?
Use is road only

3rd May 2020 10:51am

ashtrans
Site Sponsor

Member Since: 08 Nov 2008
Location: Harpenden
Posts: 258

Hi,

what size tyres do you have ? Dave

6th May 2020 6:17pm

Dwerkz

Member Since: 12 Jul 2019
Location: Amsterdam
Posts: 11

Thanks
BF Goodrich 265 /65/18
I am interested to try the 1:1 ratio,but wonder if the 18 inch will not be to big.
Ls3 is in planning for end of the year
Order i have i mind for now if it works,restored front/rear dif whit ATB’s
Restored LT230 whit ATB,and 1:1 ratio,could this work for mainly road use?

6th May 2020 7:11pm

LandRoverAnorak

Member Since: 17 Jul 2011
Location: Surrey
Posts: 11324

That wheel and tyre combination are the same over all size as stock 235/85 16's, so won't make any difference on their own. Darren

110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak

"You came in that thing? You're braver than I thought!" - Princess Leia

6th May 2020 11:14pm

Dwerkz

Member Since: 12 Jul 2019
Location: Amsterdam
Posts: 11

Hi Darren
Thanks might you think the combo from above might work?

7th May 2020 4:10pm

Yannis

Member Since: 02 Feb 2015
Location: Oxfordshire / Milan
Posts: 408

2015 Defender 90 Puma 2.2 CSW Corris Grey

Does anyone here run 1.1 ratio?

8th May 2020 12:58pm

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