HR31 diff query

[Parker]

Howdy,

I've noticed the diff (longnose R200) on my GTS-X is starting to display less than LSD qualities and its really starting to annoy me. I know this has been asked a few times but I was hoping to pick some brains and find out if there is a way to get some proper machanical LSD (1.5 or 2 way) happening again in my car.

Any opinions would be welcomed, retrofitting newer OS Giken etc. centres or full swaps with newer nissan diffs etc or ways /places to get the original one rebuilt (not welded) with a more reliable LSD action.

Cheers,

Rhino.

[T04GTR]

yes welcome to the craptastic stock r200lsd, openwheel city.

aftermarket lsd centres are the best option but REALLY expencive, 1500plus. i rebuilt mine with nismo clutchplates and it locked up at the drop of a hat. it was really good.

i recomend that you rebuild it with the nismo clutches.this basicly makes it a nismo one,ive seen both pulled apart and they are the same. il get back to you tomorrow with instructions for preload etc. its not hard at all.

i have all the part numbers at work for them.6 in total.

[Parker]

Thanks very much TO4GTR this is exactly the sort f info I was chasing.

Rhino.

[T04GTR]

Thanks very much TO4GTR this is exactly the sort f info I was chasing.

Rhino.

il get you the part numbers tomorrow. sorry for the delay.

ps. genuine nissan standard friction discs are about $90 each. i got mine from STUART WILKENS RALLY in mulgrave nsw.

[R31Nismoid]

just use normal shims and stuff.

Mine cost me $500 all up to have it rebuilt and it works virtually the same as a aftermarket one.

No-one would ever pick the difference and its taken a beating so far and is yet to miss a beat

[MrMayhem]

Mitter Parker, If your keen theres a wise old man in rocko that can remake your lsd with great precision mail me if you need his assistance

[discopotato03]

I would imagine HR31 LSD's are similar if not the same as turbo DR30's . That era of R200 LSD was designed to have some function but not over the top . A propper R200 LSD has four sets of active plates in each side to give progressive and durable (slow wear rates because more plates = more active surface area) use . The std DR30 type only has one active pair of plates in each side (along with the curved or Belville plates to give some pre load) and a spacer to take up the space where the other active plates would have been . To get it working properly the hemisphere needs to be removed and separated from the crown wheel , the spacers need to be flicked and replaced with clutch plates . Belville washers (plates) need to be selectively fitted to get some static pre load on the clutch plates . Don't get the idea that this static pre load is what does the limited slip thing , its the ramps in the hemisphere case and the wedge shaped notches on the spider shafts that achieve this with the drive or torque reaction from the pinion via the crown wheel . What really happens is if you lift a back wheel or it has zero traction the spider shafts won't ride up the ramps and compress the clutches limiting differential action . Static pre load tries to give some very limited drive in these situations , but for this type LSD to work it needs some traction to load it properly first . The ramp angles are quite good on production R200's , same as Nismo H190's and use the same clutch plates , they don't need heaps of pre load ie 40-50 lbs . Mine was set up to about 67 and was a pain in the butt for road , it would drag its bum round tight corners at low speed and try to lock up with very little throttle . These are bad traits in a road car , causes loaded up suspension joints and causes body flex and rapid tyre wear . I learnt all that the hard way with a Detroit Locker diff I once used in a Bluebird , never again .

Any Nissan diff specialist , particularly one with rally experience from the past should be able to sort it for you .

Cheers A .

[Parker]

Thanks guys all great info Thanks for your help

Cheers,

Rhino

[Parker]

Diff gets done tomorrow.

Will let you know the results.

Cheers.

[sr20det510]

Hey Crew,

I have a datto 1600 with a DR30 or HR31 Skyline R200 diff. I beleive it has Crown and pinion wear and therefor the lovely noise that comes with it.

How do i fix it?

Can i purchace a new crown and pinion for this diff?

Do any of the later model R200's have swappable parts?

Regards

Paul

[datsqik]

The later model r200's have bigger bolts thru the crown so not really interchangable but it has been done.You could try having the crown and pinion reshimed but this doesnt allways work as the crown and pinion may have a lot of wear and need replacing.These are expensive thru nissan and probably easier to hunt around for another diff.

The main problem with the long nose r200 is that most of them only have one friction disk each side and these have a tendency to tear the inner lugs off as all the power is being tranfered thru these.The nismo diffs use 3 of these aech side(actually 2 and a spring disk) and 3 friction plates(2 fricton plates and a spring plate) and then shimed to the correct break away pressure.The nissan pinion shafts have around a 45 deg angle where as the nismo pinion shafts are around 30deg which means they can lock up with less load.The nismo diff also has a chromemoly end plate to reduce the chance of the diff exploding.

http://www.gordon-glasgow.org/lsdtech.html

[sr20det510]

Thanks for that datsquik,

Any idea where i might be able to find those Nismo items to upgrade the diff?

Sounds like youve done it before?

Is that pic of your datto?

heres mine:

http://www.nissansilvia.com/forums/index.p...album&album=952

Regards

Paul

[datsqik]

SWR usually stocks most of the parts needed and is a bit cheaper than retail from nissan.If you can get a good trade price then you can get some of the plates thru nissan cheaper.Some of the other plates have to be ordered from nismo if your trying to save costs.Send me a pm and i can give you some details of who to buy them thru and what parts are needed.Your dat looks good,what grill is that.Here's some pics of my dat,you'll notice not many pics of the body as its pretty nasty.Im actually in the process of welding on another arse end and getting it ready for a paint job.Im also trying to sort out some billet halfshafts and stub axles.

http://photobucket.com/albums/v604/datsqik/