what diff/lsd are you using?

[ANVIL]

Just wondering what setup you guys are using with your RBs. Ive been reading and I think Im going to go with an z32 NA diff swap, with J30 axles.

any of you guys using the TT z32 diff? would that be a better choice for me? what i read is you need "a lot of power" to benefit from it. how much is a "lot"?

[Carl H]

my bastard setup is as follows...r33 automatic final drive (4.36 vs the 4.01 manual) - bolt in for s14 no mods.ats deftforce 2 way lsd for an open differential s13 with s13 outputshaftsspecial order 21 tooth pinion to correct speedo for changed final drive.

[imotion s14]

R33 VLSD and axles from my front clip. Z32TT diff isn't going to be drop in, it's a physically larger diff then the more common R200.

[Coolwhip]

Tomei 2 Way

[fast_s14]

A sr guy came to my work the other day and told me that he swapped the front ring and pinion out of an xterra into the r200 housing. He said the gear ratio is 4.63. Has anyone on here heard of this swap?

[Coolwhip]

heard similar, just never tried it.

[eh?]

A sr guy came to my work the other day and told me that he swapped the front ring and pinion out of an xterra into the r200 housing. He said the gear ratio is 4.63. Has anyone on here heard of this swap?

http://forums.fresh alloy.com/showthread.php?t=174146&highlight=xterra

[240z4u]

Piece of crap J30 almost open rear end. I wouldn't waste the money on it again.

Evan

[totoro001]

Just wondering what setup you guys are using with your RBs. Ive been reading and I think Im going to go with an z32 NA diff swap, with J30 axles.

any of you guys using the TT z32 diff? would that be a better choice for me? what i read is you need "a lot of power" to benefit from it. how much is a "lot"?

I'm not entirely sure why someone hasn't asked you this yet, but what are your goals for this car? Just cruising around? 1000hp crazy monster car? Drifting? Drag? That will really determine what type of diff you want to put in your car.

[drftnrps13]

s14 manual diff welded!!!

[ANVIL]

be able to run 11s+DD, 400whp is my goal

[totoro001]

Alllright, I'd go with a clutch type 1.5 way from either Tomei, or Kaaz. Nismo makes a 1.5 way as well, but you're going to pay more. You could also find a mechanical LSD, but that's gonna cost you about 1.5 times as much.

[DriftingisLame]

Are you looking for advice as to which gear ratio to use? I'm running an S13 hicas VLSD with a non Hicas backing plate. I believe my gear ratio is a 4.08 or 4.11, or close. I have an rb20 and an upgraded turbo. I loved the diff with the stock turbo, but now I'm interested in getting a lower gear ratio. Through my dealership I can get the nismo 4.36 and 4.63 ring and pinion sets. I'm considering a 4.63 as this car is 95% city driven. I'd imaging an Rb25 car would be less likely to need a lower ratio, and a 4.08 would be fine. I believe the z32 TT's have a way high ratio in the range of 3.6-3.7. That would drive me insane.

I believe my car is geared to 192 mph @8200 rpm, when the hell am I going to use that lol.

Just decide how valuable highway cruising is, how much lag you have, and what sort of racing you do, and decide if a lower or higher gear ratio is better for you.

Me, my driving, low displacement, and lots of lag favors a super low ratio.

[ANVIL]

im not even really sure, i just know i need lsd, to help my 60fts. and i do try to dd as much as i can in the summer.

im trying to explore my options but not sure what yet. i figured the na z32 one would be the easiest and cheapest and a lot of people use it. i like that its LSD and an axle upgrade at the same time for a pretty affordable price.

i looked on ebay and see theres a few jdm s13 vlsd 4.4:1, decently priced that would work with my current axles. would that be too high for me? that would mean i would be shifting gears faster right?

[OpeLok]

Tomei Traxx 1.5way

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[DriftingisLame]

Lower gear ratios will make it so you have to shift faster, yes, a lower gear ratio will also be a torque multiplier and allow you to accelerate faster. However, you will loose top end speed. If that or a higher cruising rpm on the highway bothers you enough, find a lsd with your same gear ratio. I really like my VLSD because it makes no noise, and engauges when I want it to. It cut my 60' times by around .2-.3 seconds on average with the same tires. I wont upgrade until my VLSD doesnt lock up anymore.

[chixwithtrix]

S13 welded diff/S13 axles/400hp

[BoostFab]

q45

[placham]

Stock RB20DETQ45 Viscous Limited Slip Differential aka VLSDit's almost direct bolt in into S13

You need

Q45 VLSD (think 300zx and Skyline use this exact same diff, might be some ratio difference) 300zx TT driver side axle Q45 driver side axle Q45/300zx TT rear wheel hubs.(x2) Your old drive shaft diff flange (remove Q45 flange and replace with your old one and torque the nut down, this will save you time in unnecessary drilling of new holes.) Your old rear diff cover (for S13, S14 can skip this step) Insulator bushings with washer and extra long bolts, crap that comes with Q45 diff (J30 and think S14 diff use same style and parts) new diff oil for vlsd diff's

Think the final drive ratio is like 4.3:1 or something, I wrote it down when I did mine but since forgot.

Brakes can now be upgraded to Skyline/300zx twin piston calipers, or you can run stock set-up.

Benefits 1. VLSD obviousley 2. 5-lug rear conversion3. Bigger axles (great if your putting down some serious power)4. Option to upgrade brakes to Skyline/300zx TT style.5. Take off will be affected(meaning car will be slower off of line) but higher top speed can be reached (if your into this kind of thing)

Note, not to be confused with 300zx N/A which is same as J30, Plus J30 had two different bolt patterns 6bolt and 5bolt. Think all 5bolt came with ABS sensor in nose of housing (pinion side).

Just my 2cents, hope this helps you in some way.

By the way, when I dont rev the car, it takes off just like a regular car, but when revs are raised (tire smoke, skid skid)LOL

[Joe]

kaaz 1.5

i love it.

[Cjmartz2k]

Nismo 2 way in the stock R32 pumpkin. I hate it btw--loud as hell, and I have the retarded expensive fluid they recommend also. I might have to look into the 300zx thing. I'm on my 3rd set of half shafts.

[Carl H]

lol, running a q45 diff on an rb20 has got to suck... 3.52 final vs the stock 4.08...laaaaaaaaaaaaaaaaaaaag.i have the q45 rear end in my s13 project car but then again there is also a vh45 in it...

[Largekid]

Lower gear ratios will make it so you have to shift faster, yes, a lower gear ratio will also be a torque multiplier and allow you to accelerate faster. However, you will loose top end speed. If that or a higher cruising rpm on the highway bothers you enough, find a lsd with your same gear ratio. I really like my VLSD because it makes no noise, and engauges when I want it to. It cut my 60' times by around .2-.3 seconds on average with the same tires. I wont upgrade until my VLSD doesnt lock up anymore.

You are backwards man.

a 4.56 ratio will make your RPM's rise higher and your top end to suffer, where as a 3.08 will make your RPM's rise slower and your top end gain significantly. Most boosted cars that see high RPM's run a lower ratio to be pulling up top longer. The higher ratio will help out w/ 60's and the 1/8th though...but you may have to hit your OD or 5th to finish out the 1/4 mi.

FYI, I have the R33 VLSD which is a 4.08 final and 5 bolt axles out of a Z32TT I think??

[placham]

Wait what is the ratio, on the Q45 diff anyway. I have a J30, Q45 and stocker. But I might of got them mixed up. I dont want to pull the diff down and look for the stamped ratio.

Why would Q45 suck on RB20 ??? Better than stock open diff do, right. DD not a race car.Ring gear and pinion can be always swapped to bring it back to stock ratio. Personally have never attempted this, but theory sounds, since these are R200 series diffs.

Okay never mind, got the ratio right here. Q45---> ring gear 46 teeth to pinion 13 teeth. Which comes out to around 3.53:1 ratio. J30--> believe it was around 3.75:1, I dont have teeth count off hand.
Modified by placham at 3:59 PM 11/22/2008

[mott6904]

S15 hlsd. this thing grips and pushes instead of kicking sideways

[Hihps14]

I have an s14 abs lsd with 4.11 gearing and it is almost perfect in the quarter. It can finish the quarter at the top of 3rd in the 11s if you go with the 4.36 (skyline) you will shift just short of the quarter I know from experience. My friend picked up .2 in the quarter going from a 4.36 to a 4.11