if i were to slap a gtbb37 on a det, should i send the tranny to sr20dev to have it cryoed and all? which stage would be best? i was looking on their site, but am totally clueless as to what is actually necessary to have a bulletproof tranny (sounds to me like polishing the tranny case on stage 6 doesn't do a damn thing... but i could be wrong.)

also, if i were to replace the LSD, which one is better, the quaife or the nismo (and if the quaife, is it really worth the extra $200?)

JGY Customs also does cryo treating.. check them out at www.jgycustoms.com Call and ask for Jason. Cryotreating and shotpeening are about all that can be done to the stock gears. You should also get the case welded up. You will see some hollow spots around where the axle stabs into the passenger side of the tranny.. Weld those up and smooth it down.. This helps keep the tranny case from cracking.. I didn't know NISMO made a LSD for our tranny...? Is it viscous or helical?
Travis

the NISMO is VLSD i think it has 15 or 20% more lockup.

I for one would like to see a pic of a polished sr20 tranny.....:D

Originally posted by FastNX
the NISMO is VLSD i think it has 15 or 20% more lockup.

worth the extra 200?

The quaife is not in production right now. And yes it is worth the extra money if you can find one. It is really unreal how good it is. The nismo is a bigger LSD then the stock VSLD. The nismo is open to the diff fluid so it doesn't overheat as fast either. It is a clutch type lsd.

is the Quaife Helical or VLSD? Is there anyone else that makes one?
Travis

Originally posted by unlucky
is the Quaife Helical or VLSD?

Quaife is a helical type LSD.

There is also another Nismo LSD that has been around for a while, but not listed in the catalogs. It is a Clutch-type LSD, as opposed to the other NISMO viscous LSD. It should be a MUCH better diff than the viscous Nismo one, and shouldn't wear out as fast. It is (IIRC) only about 700 dollars, and is the next best thing to the unavailable Quaife, and its cheaper. Do a search, someone posted the part numbers. The Clutch-pack diff is also available for NON-LSD trannies too!. (i.e. 98+) There are a couple of people who have tried the Phantom Grip LSD-thing. Despite being low-tech, people have reported good results with it. It is only ~$250.

Andris

Originally posted by andris
There is also another Nismo LSD that has been around for a while, but not listed in the catalogs. It is a Clutch-type LSD, as opposed to the other NISMO viscous LSD. It should be a MUCH better diff than the viscous Nismo one, and shouldn't wear out as fast. It is (IIRC) only about 700 dollars, and is the next best thing to the unavailable Quaife, and its cheaper. Do a search, someone posted the part numbers. The Clutch-pack diff is also available for NON-LSD trannies too!. (i.e. 98+) There are a couple of people who have tried the Phantom Grip LSD-thing. Despite being low-tech, people have reported good results with it. It is only ~$250.

Andris

Thats the one I was talking about in my other post. The VLSD is also a clutch type LSD. Infact I only know of 2 kinds of LSD put on oem cars that are not electronic. Clutch type and Helical. Almost everyone uses the clutch type but they vary in quality of action a great deal. I have no idea what type of LSD the Phantom would be considered. Don't start that discussion again please. Do a search and read up.

Originally posted by 98sr20ve
Thats the one I was talking about in my other post. The VLSD is also a clutch type LSD.

No, we're talking about two distinct things here. I know you mentioned the new Nismo clutch-pack LSD in your earlier post, but others are making references to the Nismo VLSD (15-20% + lockup, etc..) . You are confusing the two and talking about them as if they are one and the same.

There are the following LSD differentials for the SR20:

1. Stock Viscous limited slip diff.
2. Nismo Viscous limited Slip. Same type as above, but with different heavy-duty fluid that provides more lockup
3. Nismo Clutch-pack differential. This is not the same as the Nismo Viscous diff. It has been in existence for a while, but was only recently 'discovered' (last couple of months) because no dealers listed it.
4. Quaife Helical diff.
5. Phantom grip - not truly a limited slip in its own right.

Infact I only know of 2 kinds of LSD put on oem cars that are not electronic. Clutch type and Helical. Almost everyone uses the clutch type but they vary in quality of action a great deal.

You are incorrect and I think that is why confusion has arisen. Viscous limited slip differentials are not the same as clutch-type diffs. Viscous diffs are filled with a heavy fluid that surrounds discs in the diff. The fluid has a special property where as it is heated, its shear properties change and it resists movement from the discs. The only difference between the Nismo VLSD and the Stock VLSD is the Nismo VLSD has a heaver fluid that provides higher shear strength when heated. This fluid is the reason why Viscous diffs wear out - the fluid loses its properties after many heat cycles and exposure to high temperatures - like track events. Note that the lockup is not provided by actual contact between the discs - that is how clutch diffs work. The lockup is provided by the fluid's expansion and friction against the discs . The stock diff and the Nismo viscous diff are this type. They are sealed units whose fluid cannot be replaced or serviced. Their mechanism is not open to the tranny fluid.

Clutch differentials operate by actual contact against friction surfaces in the diff and are generally more robust and *should last longer. The Nismo cluth diff (#3) is this type. Its mechanism is not sealed and does not contain viscous fluid. It seems to be the best option at the moment.

I have no idea what type of LSD the Phantom would be considered. Don't start that discussion again please. Do a search and read up.

The Phantom grip isn't really a limited slip. It is fairly effective in what it does though. It assists the stock VLSD by providing more positive and stronger lockup. It is two pieces of hardened tool steel sprung against each other that sit between the spider gears in the stock diff. When the spider gears start to rotate out of sync, the two pieces of steel are sheared against each other, forcing them apart. This causes them to bind against the spider gears and resist their independent movement. Although kinda low-tech, it seems to work OK, especially for the price.

I'm not trying to "start that discussion again", just trying to clarify.

Andris

so clutch type then. thanks.