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r200 3.9 lsd


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#21 kalium

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Posted 13 April 2010 - 10:04 AM

With things like that, you have to be careful about the spline count; with that close up pic he has put up, count the splines and compare it with the zed R200. I keep forgeting how many splines the zed dif has...I think 29? If you find a LSD center from an early Skyline, that can be bolted straight in but there are 2 different bolt sizes used on the crown wheel... M10 and M12. Rings can be made to fit M10 bolts into the M12 holes..I did it with mine when I swapped the ratio's from 4.4 to a 3.9 courtesy of Benzed....

I'm not sure about a Zed either, but AFAIK, a silvia esque R180 is a 27 spile, as is a WRX STI. A regular WRX LSD is a 25 spline.  I'm pretty sure that a zed is neither a 25 or 27.

#22 herrods

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Posted 13 April 2010 - 10:30 AM

amazing how fast it can get complicated huh.

(for those who search in future)(correct me if i have misread something)

so for cars where a long nose R200 open diff is standard
- a longnose R200 LSD will fit, but the stub axles need to be swapped from right to left, no extra parts.
- An R180 LSD will fit, but new custom stub axles need to be bought, which are around the traps if you look
- An R200 diff centre can be bought, but bolt sizing on the crown wheel could be an issue (fixable) and the buyer MUST get a centre with the coffect number of splines, and the only way to find this out is to count them on your diff.

zedman26, can you have a look inside your diff?  find out the ratio for me?  if its 3.9 i will take it off your hands.

Cheers
Dave

#23 .

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Posted 13 April 2010 - 12:53 PM

That matches my understanding. There is another option....just to complicate things further. You can purchase an LSD centre for an R180. But as you mentioned for the R200 you need to take care with the number of splines.

For me it made sense to go with the STI diff. I got one for $300 plus $600 for the stub axles. Thats $900 all up for an LSD that is less than 10 years old.

#24 kalium

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Posted 13 April 2010 - 01:13 PM

For me it made sense to go with the STI diff. I got one for $300 plus $600 for the stub axles. Thats $900 all up for an LSD that is less than 10 years old.


Exactly.
Better deal than what the older R200s go for I reckon. (plus you save about 10kg with the R180  ;))


#25 .

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Posted 13 April 2010 - 01:17 PM

Exactly.
Better deal than what the older R200s go for I reckon. (plus you save about 10kg with the R180  ;))


I also grind the back lugs of the diff (we don't use them) that saves me another KG so make that 11KG saving :)

#26 Z

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Posted 13 April 2010 - 01:27 PM

But the R180's are not as strong as the R200 are they, isn't that why they came out with the R200 - cause we kept on smashin the R180's?

#27 PZG302

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Posted 13 April 2010 - 01:35 PM

But the R180's are not as strong as the R200 are they, isn't that why they came out with the R200 - cause we kept on smashin the R180's?


Only if you can't drive or straight out abuse the drivetrain.  I have an R180 diff behind a stroker and it has coped with 3500rpm clutch dumps for about 10 seasons of circuit racing with no dramas.

i also know of a lot of Sports sedans in the late '80's early '90's that used r180 diffs because they were relatively light for their strength, and they were coping with some big powered rotaries and also some turboed FJ's with little drama.

I would only use an R200 diff if I was required to under class rules, eg running a 260Z in Historic group Sc.


#28 Z

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Posted 13 April 2010 - 02:04 PM

That's really interesting. I'm putting together an L28 ITB Turbo build and looking for the strongest diff / driveline I can (within financial reason!). I'll put the R180 back in the mix. Apologies for hijacking your thread Herrods, good luck with the hunt!

#29 Zedman240®

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Posted 13 April 2010 - 03:15 PM

Sorry Herrods, I had a hell of a time chasing up my 3.9 LSD, its not for sale. If and when the time comes, you will be the first to know.

#30 luvemfast

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Posted 13 April 2010 - 03:57 PM

So Dimitri, have you changed the gearing from 4.4 to 3.9?
That's what I'd like to do with mine.......... Is there a thread on how you went about it?

#31 herrods

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Posted 13 April 2010 - 04:19 PM

sorry zedman, got my usernames confused, zedhead26 said he had oe for sale as well.

so, if zedhead26 could pull it apart and perform the appriopriate measurements....

And no worries about the thread hijack, puts as much of the info in front of the next people (assuming they use the search feature :P)





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