Diff's...... Tip owners look away now

[elnevio]

Hey, for all you diff destroyers, there is a guy in a scrappy up north selling an xfr box with cusco front diff in it on ebay at the mo.

I'm told it has 200 miles on it.

I believe he wants a grand.

Cheers,

Ben.

That'll be this one then: http://cgi.ebay.co.uk/EVO-4-5-6-CUSC...item2ea8939a74


Don't know who it is - but he is in Chesterfield!

So, if necessary, the CVR4 postal service is available (i.e. me!) and I'm sure I can look after it for a little while if needs be.


Plus I reckon whoever bids for it is likely to get it for £800 too.

[Gowf]

Im good for front Diffs at the moment. Finaly got round to driving it tonight, and oh my god, what a car!

Non of this gayc keeping you going round the corner, more look at where you want to go out of the passenger window! Totally epic, absolutely love it, but it is a wee bit of a handful.

Oh and the 'noisey' diff really isnt, so there is a possibility that its had a rebuild before i got it, so happy days!

[psbarham]

feckin excellent news mate, I'm really chuffed its worked OK.

I take it there is no sign of the centre diff winding up due to the potential difference in ratios that we did wonder about?

Is it a controlled animal? or a "drive it half asleep and you'll be arse first into a ditch on "sort of animal?

[Madhav]

Great thread, I have been doing a lot of research and it appears without a doubt that the alloy casing on the AYC diffs both in our VR4's and the evos cannot withstand much power.

I know it's probably just a matter of time till my stock AYC diff dies, so I am trying to organise a stronger solution now, so my car won't be off the road for too long when it does happen, i.e. have the parts on hand.

First question: Does anyone know whether you can fit a cusco LSD diff centre to the type V VR4 diff? The casing on the type V is cast iron and should be stronger right? This could be a fix?

The other solution is to fit an evo RS diff, and from what I read on other forums, the USA has cheap and plentiful supply of EVO IX RS diffs, as all evo 9's over there had them stock, unlike the JDM versions which are rare and expensive.

Second question: What parts exactly will I need to do the conversion?

I have access to a great welder/engineer the same dude who did all the custom work to fit the KKR 280's, so the welding wont be a problem, just need to start sourcing the parts.

[Gowf]

Yep, it should all be in this thread. But you will need shafts, now the shaft lengths are different for all the different evo's and so a 4 would be the best, however if you are going 9, you may have an issue as the length of those shafts are a lot longer, i also dont know if the 9 diffs are any different, i have a feeling they may well be, i know the 10's certainly are (with respect to mounting and the like).

Also, the stock rs diffs arnt all that either, so you really would want to swap the internals. I run the Ralliart plate diff, which then obviously allows you to have the adjustable preload.

[Madhav]

Thanks for the reply... I really need access to a mechanic locally that has worked on a lot of evos and VR4's. From what I read on other forums the evo 9's have a longer rear wheel base than the evo 4s, so probably no joy there.

So you are saying that if you buy an RS set up from the evo 4, then all the shafts will bolt right up? and from there you just replace the centre and problem solved?

The one below is from an evo 9, but I am using it as a reference of parts needed. Is this all you need?

There is a dude on trade me selling the diff kits for evo 4's for NZ$1675 here

[Gowf]

Right you need not worry about the all the bracketry as it wont fit. You modify your existing subframe to take it. the diff from the 4-9 should fit (im using a 7). Im using shafts from a 7, which are longer than we need them to be (cant remember by how much but the drivers side is a lot more than the passenger). Dont just go on the wheelbase as the shaft lengths changed from 5-6 but the wheelbase didnt.

It will also mate to the propshaft ( an area of huge concern when first looking at them in purely diagramic form) but you need to swap the flanges over ( they changed them on the 7's onwards not that it matters as youd be changing them anyway).

You will also find that you will also be running a slightly different ratio, but ive had no transfer box issues yet.

The obvious advantage of this set up, apart from the stronger casing, is that if you manage to get a standard diff, an uprated plate diff internals arent all that bad if you go for the likes of cusco or KAAZ

[bradc]

I've got an ST-R/Type V diff on my garage floor for Madhav now

[Adam.Findlay]

I've got an ST-R/Type V diff on my garage floor for Madhav now

OOhhh exciting hope one of you can solve the evo lsd into vr4 casing question

[bradc]

I might take it down to Ralliart one day and see if it looks similar or identical to some of their LSD's

[Adam.Findlay]

wicked that sounds good becuause I really miss the AYC in my car, cos The open type V diff that had to replace my ayc with just doesnt cut the mustard handling wise.

[Gowf]

Why did you have to replace it with a type v? Also, if you miss the ayc a plate diff is not what you are after at all.

[Adam.Findlay]

it was all i could afford at the time man. yeah and after learning how the weakness in the ayc is in the casing im opting for a mechanical lsd

[Madhav]

I've got an ST-R/Type V diff on my garage floor for Madhav now

Purchased for the grand sum of £60! Absolute bargain!

I might take it down to Ralliart one day and see if it looks similar or identical to some of their LSD's

Do it!!! Take it there before you send it to me! I have nobody to ask here in perth that really knows, so it's up to you.... help us Brad, you're our only hope.

Like I said I am in no hurry, need the diff to arrive within 6 weeks, and even then, my current diff is working fine, but I have a buyer waiting for it, and his diff is whining a bit, so it's life span is limited.

[bradc]

I was down there today, enquiring about AYC line pressures when cornering, which turned into an ACD and Motec conversation. I also sat in a rare rally spec Escort

Anyways, I had a look at both an EVO X RS and EVO 8 RS diff on the ground as well as an EVO 9 RS diff (in an EVO 9) and they are quite different unfortunately.