welded center diff

zia

zia

Active Member
just guaging interest in welded center diff. will be possibly having mine done. would anybody else be interested in this. my gearbox builder has done few other make for rally and drag cars.will be done properly by well known gearbox builder. will be looking at around £500 notes or cheaper depending on how many peeps are interested. have given up trying get proper one from diff specialists.

zia
 
A

antilag

Guest
i have a welded centre diff already if sumone wants it

and it makes the car rear wheel drive i believe :p
 
G

gearboxman

Guest
Just to clarify:
When Zia says welded, what is meant is that the original viscous pack is cut open. It is then cleaned out of all the old silicone fluid, knackered plates replaced, new seals fitted, and holes drilled and tapped for fill and bleed.

The diff is then welded back together, filled with (the clever bit) a heavier viscosity fluid, and plugs fitted to finish the job.

This increases the "poise" of the diff, making it "stickier".

We've done lots of work with the Ford range, plus several rally Evo6's.

To that end, we are currently cutting open a GTiR centre VC. We usually find that the first one ever to be cut gets destroyed, finding exactly the right place to machine. :? Watch this space...

I have been asked about playing with the torque-split of the centre diff.
Unfortunately, although possible, the cost of fitting an epicyclic gearset into the centre diff would be prohibitive. :(

Increasing the poise of the centre diff will reduce wheelspin. Don't forget though that increasing that poise will actively encourage the car to travel in a straight line, which will increase understeer! :wink:

You can, of course, help yourselves to more front end traction by softening the front springs/dampers, plus raising / stiffening the rear.

is bernie gonna be doing these mate??
may have to as him about doing one for the evo soon
Click to expand...
.....ultra-special price for you...... :wink:
 
Nad

Nad

Active Member
Its interesting you saying about that as I was looking at how to get into it. Was going to try to find someway to presurise it somehow with more fluid via a pump to make it adjustable. Where there's a will, there's a way.

Nad
 
K

krazeguy

Guest
Anyone know where the best place to cut the VC pack is? Im probably going to put it in a lathe and machine it open slowly. Or anyone else got any other good ideas on how to open it up?
 
T

turblio

New Member
I have suspicions about the diff on mine it is almost impossible to get wheelspin and if I turn right or left sharply the wheel on the inside skips and almost locks the car up and has for the last 6 years... any Ideas?
Frank
ps I get very little understeer as opposed to some I have driven :?
 
O

Odin

Guest
Does anybody know what the standard gti-r cetre dif is rated at ?. ie newton mt's per second?.



rob
 
S

samellio

Guest
i'd be interested in this :wink: but can anyone explain exactly how it will affect the way the car drives :?:

You should probably changed the post to 'uprated centre diff' and i'm sure there will be of interest :wink:
 
S

samellio

Guest
Ps gearboxman sorry for asking too much :roll: but if you could get the car on the rollers that gives wheel bhp before and after fitment it'd be proof of what it does :wink:
 
B

blugtirboy

Guest
hi gearbox man :D you rebuilt my gti-r box with a quaiffe gearset in july 2001 ,done 20,000 miles on it with no problems :D :D :D
 
N

nismoboy

New Member
samellio said:
Ps gearboxman sorry for asking too much :roll: but if you could get the car on the rollers that gives wheel bhp before and after fitment it'd be proof of what it does :wink:
Click to expand...
would this give more power atw? i thought this mod was to give more grip?
 
K

krazeguy

Guest
Is there anyone that actually knows what they are talking about? Someone that has had the thing open?
 
zia

zia

Active Member
if you don,t know where to cut it i guarntee you fuck the clutch pack. have seen cut opened center diff with clutch pack's. the viscous fluid is quite thick. this is not power mod. the (unavailble for gtir) torsen helical or kaaz diff would give better power transmission/ more rear biased torque/power distribution due to the configuration of center diff. as it stand i have decided to replace or renew the the clutch pack and will fill the diff with sligthly thinner oil to give more open'ness. if you replace the fluid with thicker viscoisity fluid it will be more rigid like lsd. but the negaitive aspect is that it will increase understeer which i don,t want.

zia
 
K

krazeguy

Guest
Can you please advise on the best place to cut, in order to open up the coupling, allowing me to drain the fluid and lock the plates. Perhaps drill through and place some rods through the plates?
 
zia

zia

Active Member
cutting right on the edge of the housing would best to avoid destroying clutch pack. bernie used plasma cutter if i remeber correctly. i was also thinging about welding the ouput shaft and along with the spider gear as this would be more direct but knowing that the gtir casing is not the strongest that it'd blow the casing to bits. you could remove the spider gearand fit phatom grip between them like some have done to the front diff?

zia
 
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