i no this topic has been up a coule of times, but will 1 be ok in my 2wd road car ?? this is only bcoz im board of breaking diff's
and can some1 put up the post about them
thanx

 

if you keep breaking them due to a power increase I would source a suitable unit built to take the increased torque, have a chat with Bernie at CTS. Not sure how well a granada /sierra diff welded will handle more than 300lb ft torque often, what you running power wise?

 

not made it the rollers yet, but hoping to be pushing arount 350-400 bhp
dunno about tourqe tho!!

 

how does welding a diff make it better ?

 

if you do a search, foreigneRS welded his up with good results

 

ok will have a looksee, cheers

 

will u notice anything on conering (good or bad)
alot of people saying it'll be hard too control !!
any idea's

 

if you think about it i will cock the cornering of the car up as it will constantly be giving drive to the both wheels eg the outside wheel with the least pressure will have very little traction through the bend so all the power is directed at the one wheel as you power through the bend which will in turn mean you will loose traction on the inside wheel and you will have bundles of oversteer.
great for drag racing but not for the road

 

Well, beyond the theory and rumour that most "advice" consists of, YES, its ok, I can totally deal with it, even on a daily driver, and ive driven i dunno, 4-5 cars running them, inc 1 current car.

You actually get slightly more UNDERSTEER rather than oversteer.

And generally you get more traction as the wheel with least risistance dont just light up like it does normally.

All it means is when you actually are oversteering its a whole lot more controlable as both wheels are spinning, so its not always trying to drag you back straight.

Frankly, if I had 800quid to spend, id not get a flash diff, id get it welded and spend the 750quid on smmat else.

Some people might not like it, but personally I prefer it.

Dont forget, if you get a proper plated diff it will clunk and knock like fuck when doing tight low speed manouvers etc etc too, infact you might not be able to tell much difference...

 

with a lsd you can fine tune them to lock when you need them to.
and fact you cant go as fast around a track with permanant drive to both wheels than you can with an variable traction car.

 

Can fine tune them, but your average user of them has no idea how they work, just fits whatevers given to them, and leaves it, then after a few years the plates are worn out and its as bad as an open diff (or stock shite viscous LSD) again.

And yeah, decent plated diff will be quicker on the track, but he never mentioned a track once.
And compared to the wank stock viscous LSD, once you adapted your driving style to suit, its prob faster...

 

true

 

only really wanted to no how they are on the road !!
as for tuning a diff thats well over my head!
im good at breaking them tho


1 more thing what is the best ratio to use??

 

Depends what you want, more acceleration, more top speed, or cool as it is?

Your prob best off sticking with standard ratio, its pretty well suited to cossies IMO

 

its ok as it is but id probley say acceleration really,
is a 3.9 any as iv got 1 of those and a 4.1 i think the other is

 

https://passionford.com/forum/viewtopic.php?t=201270

https://passionford.com/forum/viewtopic.php?t=211090

good advice from Stavros. i agree completely. i wish i had done it years ago.

if you want to try it, why not buy the welded one that i have for sale and you can swap over in half an hour

 

Good advice above, nicely put STAVROS If you have a 3.9 for sale TRAY25 I am interested as I may want a slightly lower gear for track use so I can maybe use more than 3rd?
I hear 4.44 or even 4.1 maybe too low for track and especially road motorway miles? anybody?

Foreign RS has been ok with his diff so stg3 shoud be fine, maybe consider polish and peen your wheels for longer life?

 

i sincerely doubt that you will break a welded diff.

 

good!

what about 500bhp, any chance the std teeth will still live then just a thought

 

depends on how much weld you use, what plate, etc. but the teeth are not doing anything anymore. you are just turning the whole centre into a solid mass. in fact there are parts for diffs available that replace the centre parts with a machined solid.

what would happen with enough torque (which is what destroys components, not power ) is that something else would become the next weakest link, probably the crown and pinion gears.

 

Thats what I thought you meant, pinion and crown wheel teeth, as planet gears are welded together. So you dont know what a std set of pinion and crown will take bhp and torque wise? When I said breaking the diff thats what I meant, not the weld on the planet gears

 

sorry

i don't know, but there must be a reason why the 9" diff exists

 

i also run a welded diff and you cant even tell its there in a bad way apart from pulling in and out of car parking spaces i personally think its great