EVO 8 DIFF fitted & working

[stuey]

And if you were running 225/40 18's and there was a 2mm difference between front and rear tyre's !

Then it would be 7.5 revolutions per 2km ! Or approx 15m's !

So i take it you haven't read about the Freelander then

I've just put 235/40/18's on back of mine for bit of extra width, and to drop the gearing if poss..

What's the deal with the Freelander diff then ??

[bradc]

and you've still got 225/40 on the front? Thats not so smart actually....

[Wodjno]

This is the diff ratio's from the Early Freelander's: 3.214:1 v. 3.188:1
The rear is the taller ratio..

[Wodjno]

and you've still got 225/40 on the front? Thats not so smart actually....

It's the same as running 4mm difference in treadwear front to rear

[bradc]

still not a good idea for transfer case longevity

[Wodjno]

still not a good idea for transfer case longevity

So whats the difference between the front and rear wheels over 2k on the freelander ?? I can't work that 1 out

[Wodjno]

So whats the difference between the front and rear wheels over 2k on the freelander ?? I can't work that 1 out

I had a go at working it out !! Is it approx 16m per 2km ??

And the difference from fitting an EVO 8 rear diff would be 2.9m per 2km ??

[CANDEE]

I used to have 215/55/16's on the back with 205/55/16's on the front and ran like that for over a year and about 8000-10000km with no issues at all....

[bradc]

Wodj, the freelander setup is designed that way. I do know that subaru recommended against more than 1.5mm difference between front and rear on their 4wd system, dunno what the mitsi recommendation is though.

[Wodjno]

Wodj, the freelander setup is designed that way. I do know that subaru recommended against more than 1.5mm difference between front and rear on their 4wd system, dunno what the mitsi recommendation is though.

Yes i know ther designed that way

My point is ! They designed them that way, knowing that it will long term damage the vehicle.. Just for the sake of making the vehicle handle more like an evreyday car, rather than a 4x4.. They warranted there cars for 3yrs or 30000 miles.. And thats with a difference in ratio more than 5 x greater than that of installing an EVO8 diff...
The diffs do give out on the Freelanders But with mileages much greater than 30000 miles..
Land Rover reduced the the difference in ratio between front and rear diffs in there later models.. They did this because of the rate of failure of the diffs, and they overcome the handling probs with upgrades to the chassis and suspension..

[Kenneth]

I would have thought the viscous coupling would handle the small amount of difference no problems.

The whole point in the centre diff is to allow differences in the rotation speed from front to rear. The viscous coupling is then employed to minimise the difference in speed, but still allow for some variation.

[Wodjno]

I would have thought the viscous coupling would handle the small amount of difference no problems.

The whole point in the centre diff is to allow differences in the rotation speed from front to rear. The viscous coupling is then employed to minimise the difference in speed, but still allow for some variation.

[Louis]

Hi Folks,
I have now been running my diff for just about exactly 1 year. around 22,000 (twenty two thousand) miles. I have had no issues, and all is still working well. If you check through the links and the MLR register info, you can see how many times this has been done with evos. I did quite a bit of research before going ahead, and was 99.9% sure before I tried it.
But basically, I have had no issues or probs in 22,000 miles. No AYC codes or ABS codes, or ECU codes. I realise that all, or any probs may not show up as fault codes.
I will keep all posted, if I ever have probs, cheers Louis

[Turbo_Steve]

LOL...thing is, it probably halves the life of something like the transfer box, but as they last over 200,000miles anyway, you'll never know. Have seen much worse abominations than this last for years. (Subaru WRX rear diff in UK car, for example) I wouldn't worry about it: Louis...seems sensible to me.

[Wodjno]

LOL...thing is, it probably halves the life of something like the transfer box, but as they last over 200,000miles anyway, you'll never know. Have seen much worse abominations than this last for years. (Subaru WRX rear diff in UK car, for example) I wouldn't worry about it: Louis...seems sensible to me.

You was actually making complete sense

Until you said "Louis seems sensible"

[stuey]

I did realise if the overall diameter was massively different font to rear it may damage the 4wd system, but as mentioned already, surely there must be some margin for differences...
My wheels already stick outside the front wings more than i'd like so don't wanna go to 235, also I think the rear could do with more traction personally..

[Wodjno]

My wheels already stick outside the front wings more than i'd like so don't wanna go to 235,

How come they stick out with 225's ?

Are they on Super Wide wheels ? Or do you have a strange offset ?

[CANDEE]

How come they stick out with 225's ?

Are they on Super Wide wheels ? Or do you have a strange offset ?

Im like that with my E8 rims - have to run 225 on the front otherwise the tyres dont fit in the guards....

[stuey]

How come they stick out with 225's ?

Are they on Super Wide wheels ? Or do you have a strange offset ?

8" wide & 38mm offset I think, pre facelift so no arch extensions.

Not as bad as the old 8.5" Kahn wheels though.

[Louis]

[QUOTE=bradc]It is 0.145%, I doubt that makes a difference, especially when if you have a brand new 235/45/17 tyre it has a circumference of 2020.30mm, if you get 1mm of uneven treadwear, thats 2014.02mm, or 0.312%, which is about twice as much as the difference in the diff.
AS Bradc says above,

Also:
The difference in the ratios is 0.00480. (five hundredth)

Which means that the difference is the same as the rear tyres being half a millimetre out from the front.

I don't see that as being a prob for the viscous coupling to handle.
I would say that the difference is similar to:
not buying 4 tyres at the same time,
having a flat spot on a tyre,
lower tyre pressure in the rear to the front.

I honestly don't think it is a difference that anyone could say 100% that all their tyres rolling radius-es (radei FFS!) are less than half a millimetre out!!.