Helical Diff

[SteveL]

i didnt say it was a Quaife...i said a hlsd

<{POST_SNAPBACK}>

A lot of people seem to refer to the Quaife/Torsen style of diff centre as 'helical'. I seem to remember Nissan doing that in some of their sales blurb.

[Cubes]

I still can't find anything on the S15 diff being 'weak'.

Only the gearbox's once up over 200rwkw with decent tyres.

Do any of the blokes with R34 GTR's have issues once upping the power?

Edited November 21, 2005 by Cubes

[Bl4cK32]

Darren...

how could you want to sell the Nismo GT Pro? 

Especially since you bought it from me freshly run in! haha.. It's such an awesome diff, you'll miss it when it's gone......

One my GT Pro in my S15, I found that setting the initial torque to medium made it nicer to drive.  Sure it still clunks, but with regular oil changes (castrol diff oil, 75w140 i think) and the medium setting, it's a lot more tolerable.  At lower speeds, just need to either work the clutch, or slide the tyres around

take care!

KJ

<{POST_SNAPBACK}>

Lol, howdy mate. Dont worry i havent sold it. I actually went for a drive yesterday and asked myself what i was thinking

I havent played with the settings yet (still as is from when i bought it off you ) But i would like to try to go to the medium setting to see what its like. I just havent had the time to get under there yet and pop the half shaft out

I'll give the medium setting a go soon

[Bl4cK32]

With regards to the s15's diff (or the gtr's) being weak, i still find it hard to believe.

Yes i have heard of the s15 gearboxes as sheit, but never heard of any diff problems. id say they have one of the toughest factory diff setups.

Unlike Holden who only warranty the damn thing for 12 months

[SteveL]

With regards to the s15's diff (or the gtr's) being weak, i still find it hard to believe.

<{POST_SNAPBACK}>

'Weak' is a term that someone else used.....it's all relative. Having had one apart and seen the design I can see where the potential for failure is greater given particular features of the Torsen T2 design (S15/R34 base).

[Cubes]

I do agree... Looking at the design you can see the how it would be weaker.

I'm aiming for upwards of 300rwkw.

The current VLSD does what it whants when it wants, it seems to really like to let go of the left wheel during second gear acceleration.

I might give Tilbrooks a buzz as they have built worked with R34 GTR's and quite a few s15's and see what they think on the helical s15/gtr diff's.

Edited November 22, 2005 by Cubes

[Chris32]

Don't do it Darren!!

Joel could probably tell you, my diff, ATS 1.5way is pretty quiet, it doesn't clunck all that much, only in shopping centre type turns

I'd have a go adjusting it mate, once you get some big power, you will need all the grip you can get. Maybe try the medium and hard setting, in theory, the more pre-load, the more it will just squeal a tyre, and not dis-engage the diff.....

I think Nightcrawler lunched his diff in his S15 a while back didn't he? I remember a problem he had with open wheeling or something after a few drag runs

[Cubes]

ok.. I've made my decision..

GTR Diff... I've found a second hand one from the wrecker for a pretty decent price.

If it won't fit up with my axles i'll grab the GTR axles and hubs.

With regards to setting the diff tighter causing it not dissengage.. Sounds like a good idea. The clunk and wobble when it disengages is the horrible part of a mechanical clutch.

Edited November 23, 2005 by Cubes

[Bl4cK32]

Yer ive pretty much talked myself out of it.

Im going to up the preload to medium and give that a go for a while.

I always thought it was one of the best mods ive done to my car....

I reckon rebuilding my gearbox will make me a happier

[mr_rbman]

ok.. I've made my decision..

GTR Diff... I've found a second hand one from the wrecker for a pretty decent price.

If it won't fit up with my axles i'll grab the GTR axles and hubs.

With regards to setting the diff tighter causing it not dissengage.. Sounds like a good idea. The clunk and wobble when it disengages is the horrible part of a mechanical clutch.

<{POST_SNAPBACK}>

give us some more details on this! what type of LSD does it have and which GTR you getting it out of?

[Chris32]

Clint32 has a GTR diff in his 32

had to use GTR hubs and driveshafts as far as I know

I think his was out of a R32

Good choice in keeping the 2way Darren!

My diff needs a oil change, what have you been using in yours?

[Cubes]

The GTR flange is the same 5bolt flange as the GTST's. Well so I've been told by an importer.

For the GTR center to fit up in your GTST diff housing you will need the GTR center and half shafts.

IF you want the tougher GTR axles grab the GTR axles and hubs.

I'm going to drop the whole GTST housing grab the GTR center and half shafts and track down a S15/S14/S13 Auto 3.9:1 crown and pinion then take it to some one to install and shim up to make sure its nice and tight.

Hopefully the 3.9:1 will help fuel economy a little and make use of first gear. 40km/h in first at peak power isn't much fun.

Edited November 24, 2005 by Cubes

[Bl4cK32]

Clint32 has a GTR diff in his 32

had to use GTR hubs and driveshafts as far as I know

I think his was out of a R32

Good choice in keeping the 2way Darren!

My diff needs a oil change, what have you been using in yours?

<{POST_SNAPBACK}>

Been using the Redline oil. Cant remember what spec. Bought it at Mile end AutoBarn. Im going to do an oil change when i up the preload.

Im also swapping the crown wheel and pinion over to the 3.9 same as Cubes, so i can get a little more out of first.

[Chris32]

Cool

tossing up between the redline and the castrol, both have good reports

that diff ratio would be good with the big block torque

[Bl4cK32]

Just checked its the 75w90 (GL5+) redline stuff.

Would be good if i could get the specs of the nismo sheit they recommend using it with

[Bl4cK32]

lol anyone seen or used these>

S13/S14/S15/R32/Cefiro Trust Design Diff Casing

http://www.driftshop.com.au/diff.htm

Are they worth the cost??

[Cubes]

I've seen them.

I would think not benifitial for street, but most definitely benifitial for track work.

Anything to help keep the diff cool is a good thing. The bathurst gtr's had diff oil coolers.

Edited November 24, 2005 by Cubes

[1400r]

"I'd have a go adjusting it mate, once you get some big power, you will need all the grip you can get. Maybe try the medium and hard setting, in theory, the more pre-load, the more it will just squeal a tyre, and not dis-engage the diff....."

Ive got a cusco 1.5 way and it doesnt squeal the tyre's at all when cornering it just clunks and bangs all over the shop any idea how I can adjust it?

It seems to fry the tires a lot better than my old stock diff and I seem to have a lot more forward thrust aswell but it doesnt make the tires squeal around corners like the bosses 33's diff does (SA guys will know what Im on about)

[Bl4cK32]

Thats the beauty of the Nismo GT-Pro Lsd, you can adjust the preload as per the sheet i posted on the first page.

The only other way i think is to shim it tighter, or take em out to make it looser.

[T04GTR]

i dont know of any racing skylines or the like that use a torson/helical/quafe(all same principle)

the shuder is anoying but if you want a quiet diff you need to reduce the power so you can reliably use the helical method.