rear diffs

[Scanny]

it seems i dont want SAYC after all and i am better off with an RS rear diff. considering the EVOs were legendary due partly to AYC capabilities, why is the RS diff worth approximately twice as much (or more) as an AYC diff?
http://www.ebay.co.uk/itm/Mitsubishi...item1c2473ca0a

[Nick Mann]

I guess because they are rarer and stronger?
I've got a feeling that someone mentioned that you can fit an lsd diff into the open diff casing. That might be a good way for you to go?

[Longbow77]

Far stronger and hence more reliable when abused on track etc.
Can take more power.
No AYC pump to fail.
Less servicing required.
Locking characteristics can be tailored quite easily if needed.
More predictable handling i.e. it is easier 'learnt' than an AYC car as the electronics can tend to have a mind of their own
Much rarer than AYC diffs hence the price.

Luckily the Evo wagons have them fitted as standard!

[Adam.Findlay]

evo rs diff wont fit into the galant/legnum subframe without mods like what Gwof had to do.
the way to do it is use a type v open diff, ST-R or facelift 4wd rear open diff and bolt in just the rs rear lsd cartrage. much cheaper than buying a whole rs rear setup. (think my rear lsd cost me ~400NZD off ebay)

[Scanny]

my rear diff came from a FL so it might be the right one which is handy. how much work is involved in modding it with the LSD cartridge and is it a specialist job or could a tuner do it?

[Gowf]

All depends on what type of diff it is. If a salisbury type then you'd prob want to check the plates anyway for wear, and then you have to make sure you have the correct preload. Torsion diffs just go straight in. The reason that the RS diffs are more expensive is that its the choice for the budget rally community (the diff's we run on the 5 are 4k).

[Scanny]

what would you do to compliment the front LSD Gowf? i want something better than the open diff i currently have but it isnt going to be a rally car so i dont need a top of the range diff that requires intricate setting up. im guessing my AYC pump is dead now so going back to AYC would need that factoring into the price if that is your recommendation but i do have half shafts for an AYC diff if i need them. the original plan was SAYC but Blue reckons i should go with LSD to avoid a conflict between front and rear

[Kryton]

If you are not in a rush, I have an rs front sitting at mates workshop & sayc on the car so will be able to test out the combo. I'm not going to be able to test it for about a month though

[Scanny]

i am only researching for future plans just now Chris. it will be a few months before i look at putting it into action. i would like to know the results though even if i didnt get the chance to test AYC before it failed on me

[Kryton]

Ok cool I will do some extensive stress testing when I'm back gonna have an unsprung 6 puk clutch fitted & boost up so if mine last yours should

[Adam.Findlay]

All depends on what type of diff it is. If a salisbury type then you'd prob want to check the plates anyway for wear, and then you have to make sure you have the correct preload. Torsion diffs just go straight in. The reason that the RS diffs are more expensive is that its the choice for the budget rally community (the diff's we run on the 5 are 4k).

as long as the rs plate lsd cartrage is low kms it will be fine. if scanny isnt confident enough to install himself a local garage can easily install the lsd into the diff casing. 4k is a extreme cost for a diff on a road car, hence why I suggest a standard rs cartrage which the rally guys sell on once they upgrade to the likes of cusco etc... like i said i paid 400nzd for mine which is an evo 8 rs with <30,000kms on it

[Scanny]

If you are not in a rush, I have an rs front sitting at mates workshop & sayc on the car so will be able to test out the combo. I'm not going to be able to test it for about a month though

something you should know about with the RS transfer box mate. it is something i need to find out about to see if my own will be affected and how to fix it
http://www.lancerregister.com/showthread.php?t=756

[Gowf]

as long as the rs plate lsd cartrage is low kms it will be fine. if scanny isnt confident enough to install himself a local garage can easily install the lsd into the diff casing. 4k is a extreme cost for a diff on a road car, hence why I suggest a standard rs cartrage which the rally guys sell on once they upgrade to the likes of cusco etc... like i said i paid 400nzd for mine which is an evo 8 rs with <30,000kms on it

This is why I said that the RS diff's are so expensive over here because the rallying community loves them as they are not £4k. A low km RS diff WILL still need checking. Ours are checked every 7 rallies (~250stage miles) and you DO find signs of significant wear. All depends on what it has been used for though, if a road car then more than likely fine, however if getting from someone who is has been through the forest with it then I would definitely inspect it. Stupid not to seeing as it is already out

[Scanny]

the MLR guys seem to prefer other types of rear diff for mainly track use and recommend an RS diff for mainly road use so its possibly a question of finding someone who is upgrading a road car to track car and has a relatively unabused RS diff that they no longer need or want

[chris g]

I think for everyday use on UK roads the AYC/SAYC is best option...

[Gowf]

This is an age old question that is down to personal preference. Richie, how do you want the car to behave? If you want it to drive where you point the steering wheel, then let the rear torque vectoring system do its job and dont bother with a plate diff. If you prefer to drive the car intuitively where you have to correct when its exceeded the lateral acceleration that the tyre can provide at that given load then get the RS. If you do not really care and are not upping the power, live with a knackered AYC or open diff.

[Chris.W]

What Gowf says!!!! Thats what i was trying to say on the phone but he puts it better.

[Scanny]

its no secret that i am not a fan of computers telling my car what to do and prefer to have full control over what its doing which is why i have always been dubious of AYC. i have taken other peoples opinions into account when i planned to upgrade to SAYC but after my chat with Chris the other night, the RS diff seems to be the better option. its an improvement over an open diff (no frills 4WD) but it still gives me control over what the car is doing. if it behaves the same way that the front RS diff does then i definately want it. i love that front diff and i really can feel it, especially when lifting off to change up a gear (i know you arent meant to change gear on corners due to the adverse effect on handling but its not a problem when i am taking it easy which is most of the time). i do realise that the front wheels having LSD will make a much bigger difference than the rear in terms of feeling it doing its job but it must be designed to do something better than an open diff even if it the difference is less obvious from the driving seat