what factory diff? To much info

[boomers04]

I am looking at replacing my open diff with eather a vlsd or a helical, i have a 95 w/ rb25. From what i have gathered that the helical is better but will not last as long. if i do go with the vlsd what should i get the r32, z32, j30. I guess what i should say is, I want a car that will drive on the street ( not a daily driver) but when i go to the track will hook both tires. I would like to spend under 500 with axles. And some what of a direct bult on.My goal with this car is 500hp. So what would you suggest. There should be a sticky breaking down each type and pros and cons.

P.S sorry for the long post

[codyace]

I am looking at replacing my open diff with eather a vlsd or a helical, i have a 95 w/ rb25. From what i have gathered that the helical is better but will not last as long. if i do go with the vlsd what should i get the r32, z32, j30. I guess what i should say is, I want a car that will drive on the street ( not a daily driver) but when i go to the track will hook both tires. I would like to spend under 500 with axles. And some what of a direct bult on.My goal with this car is 500hp. So what would you suggest. There should be a sticky breaking down each type and pros and cons.

P.S sorry for the long post

With 500 hp, you should be looking at a 1.5 way clutch type IMO. Nismo or Kaaz should fit the bill just right....

The helical diffs work great for circuit cars, but they don't always hook up great at the drag track.

VSLD's are good for stockish power, but are easily wore out (and don't always work)

[Slappy]

A Helical diff is no different then a VLSD is terms in life span. You either get a good one thats not on its last leg or you dont. Unless you buy a new one from the dealer. J30 & Z32 TT VLSD have different gear sets than S13 HICAS , S13 JDM , & Z32 NA VLSD. The J30 and the Z32 TT VLSD have taller gears.

A real LSD is gonna cost more then $500 if you buy an new one , whether it be Nismo , Cusco or KAAZ. Plus theres the maintenance of a real diff , where as a VLSD has almost none.

I just read that it wont hurt to change diff fluid whenever you change you engine oil , but said its rather ridiculous. FSM states to change diff fluid every 30-50k miles.
Modified by Slappy at 1:39 PM 1/3/2008

[boomers04]

can you fit a z32 tt in a s14, my has one that he is willing to fork over for cheap. What has to be done in order to do it. I have heard thAT the z32tt are unbreakable, or very hard atleast. What is the life spand of a nismo or kazza. I should go for the 1.5 if i do got that way, for more of a street drive. Thanks for the help so far.

[Slappy]

can you fit a z32 tt in a s14.

Apparently not

I have heard thAT the z32tt are unbreakable, or very hard atleast.

Its still only a stock unit. You will have OEM reliability , but im not sure about how they will hold up to high hp.

What is the life spand of a nismo or kazza.

As long as you maintenance it , and do the correct break in procedure , they will last a long time.

should go for the 1.5 if i do got that way, for more of a street drive. Thanks for the help so far.

I would say yes because a 2 way is full lock under accel and decell.

LSD Info

http://www.kaazusa.com/introdu...D.htm

http://www.drivingfast.net/tec...s.htm

http://importnut.net/lsdswap.htm
Modified by Slappy at 10:17 PM 1/3/2008

[koukicody]

can you fit a z32 tt in a s14

TT, no. its a r230v not a r200. But, you can use a 300zx n/a lsd with 95-96 J30 axles.

edit: 92-94 J30 axles, not 95-96. pardon.

[koukicody]

oh, and i would go with a 95-96 J30 diff. they are easy to find in junkyards, and since ALL J30's came with a vlsd you wont have to worry about if the car you're pulling the diff from is open or vlsd. It will bolt right up to a 95 without having to swap out the rear cover like you would a s13, and the 3.91 ratio would be a great match for the rb25 so you can appreciate all that boost on the highway.

[Slappy]

TT, no. its a r230v not a r200. But, you can use a 300zx n/a lsd with 95-96 J30 axles.

Really? Hmm. Whats the difference besides gear set between the NA and the TT?

[koukicody]

the pumpkin is too big.

[Slappy]

I cant find anything to verify that. Only found info that the gears are different so far.

http://www.240sx.org/links/installs/lsd/lsd.htm

EDIT - Yup , your right.

"First thing: DO NOT get the twin turbo diff, as it uses an R230V which is physically too big to work, and it's got a much different gear ratio (3.6X:1). The non-turbo has the same ratio as the 240 (4.083:1). The biggest problem with the 300ZX diff is that the output flanges are different (but the same as the early J30 differentials). They look like a '5 star' flange where the 240sx uses 3 sets of 2 holes. The parts to convert a 300ZX diff to work in a 240SX can be had for around $200-300 new... "

http://www.ka24development.com/vlsd.html

[boomers04]

thanks for all the help i think i will go with a j30 and if the money allows it got with the kaaz 1.5. But just got the and money seems to be flowing in it. So if i can get away with a 300 dollar j30 for right now i will. Thanks for all the help

[boomers04]

oh ya the axles of the j30 are they better than the s14 or the same

[boomers04]

i went to the junkyard and they had 2 j30s but they were both 94's will that work

[gumby74]

Honestly, used factory VLSD's are not worth the money they cost. They can not be re-furbished without considerable expense if at all. A helical, outside of being run dry or bad forgings, will outlast a viscous under the same operating conditions. Keep in mind that is my opinion and the opinion of the guy that does work on my 4x4 who has been a gear head and master tech longer than I have been alive, over 33 years. He recently freshened up the Art's Carts C-6 transmission in my truck, with a full 1 year warranty. Regardless of use. Nobody in these parts offered me longer than 30 days and limited use warranties. And I did not pay more than $25 more than the average estimate. He knows his stuff.My point, fork out for a clutch type, and know that when it wears down, which it will with hard consistent use, it can be re-built. You can also adjust the plates to your liking. The diff has to be removed, but at least it can be done. Or get a used helical, hell even an OBX is preferable to a VLSD (in my mind). And know that it will be as strong as your axles. How much torque can it handle? I honestly do not know, but I have yet to hear of anyone overpowering one to the point of mechanical failure yet. Something to think about. I think the stickiness of the tires, ring gear and final drive would dictate a helicals effectiveness and overall lifespan at the higher power levelsBut then, if you can't afford to support 500 horsespowers, you can't afford to make 500 horsespowers. It's a hard, ugly fact.now thats a long post.