The other FC differential (56k warning)

firzen · 12-15-2008, 12:21 AM

I got something interesting last week.

Assuming I made the right purchase, this is the Torsen diff that the Infini IV came with.

I need to check if this is the real thing first and then find out if it's broken or not. I tried fitting some dowels into the diff and turning them and it seems to be alright. One goes clockwise when the other goes counter. Doesn't seem like there's much play either.

I've spun the side bearings a couple times and it seems there is a bit more resistance compared to other diffs I've played with. I suspect that it is because the differential is dry as bone with no oil anywhere. Makes sense if it was shipped from Japan.

From what I've seen and read, it looks like I will need the S4 T2 half shafts to complete the swap. Is there anything else I need? And should I get the earlier model (longer) shafts or the later S4 (shorter) shafts?

If anybody has any ofther tips, let me know.

Thank you.

Whizbang · 12-15-2008, 11:11 AM

Whoa what did that set you back

firzen · 12-15-2008, 12:30 PM

Huh?

85rx-7gsl-se · 12-15-2008, 12:31 PM

How much did u pay?

firzen · 12-15-2008, 02:09 PM

Not too much- around 250 shipped.

Flooder · 12-15-2008, 02:48 PM

Assuming your car is NA, you'll need a driveshaft too.

RETed · 12-15-2008, 04:33 PM

It's basically the same as a stock FD3S Torsen LSD.
For the price, it's a bit too much.
You can find them on eBay starting bid for a penny.
Typically final bids are usually under $100.
Shipping from Japan through cheap surface shipping is a little under $100.

-Ted

firzen · 12-15-2008, 05:38 PM

Oh really? I thought they were usually more expensive than that.

RETed, I think I read somewhere that you ran these things before- are you aware of any differences between these and the FD units with regards to installation?

Thanks.

RETed · 12-15-2008, 06:13 PM

There's a seller on eBay named japandyno that does this.
I've found another eBay seller that does the same thing, but I can't remember the name right now.
I've gotten them for as cheap as $35.
Add $90 for surface air from Japan, and it's a fricken' deal for what you get.
These shops are probably dumping the FD Torsens for customers that swap out to aftermarket LSD's and don't want the stock units.

Installation is the same for any LSD...
If you can mark the ring position before you take everything apart, that makes this easier to put back!
The change in LSD does not alter the ring to pinion contact area.
You do need the equal length half shafts, so if you've got an S5 original diff, you need to get the proper stub axles.

-Ted

Whizbang · 12-15-2008, 07:26 PM

i searched for his stuff and only found them for like 250

firzen · 12-15-2008, 07:39 PM

^ Same here, I've only found them for 250. Oh well, the money is spent and at least it's cheaper than buying a new unit from Mazda...

Does anybody know whether the earlier model S4 T2 stub shafts work better or do the latter ones?.

Max777 · 12-17-2008, 04:34 PM

Hmm, I really want this and a Turbo rear housing...

12-15-2008, 12:21 AM	#1
firzen Rotary Fanatic Join Date: Mar 2008 iTrader: (2) Posts: 231 Rep Power: 17	The other FC differential (56k warning) I got something interesting last week. Assuming I made the right purchase, this is the Torsen diff that the Infini IV came with. I need to check if this is the real thing first and then find out if it's broken or not. I tried fitting some dowels into the diff and turning them and it seems to be alright. One goes clockwise when the other goes counter. Doesn't seem like there's much play either. I've spun the side bearings a couple times and it seems there is a bit more resistance compared to other diffs I've played with. I suspect that it is because the differential is dry as bone with no oil anywhere. Makes sense if it was shipped from Japan. From what I've seen and read, it looks like I will need the S4 T2 half shafts to complete the swap. Is there anything else I need? And should I get the earlier model (longer) shafts or the later S4 (shorter) shafts? If anybody has any ofther tips, let me know. Thank you.

12-15-2008, 11:11 AM	#2
Whizbang Respecognize! Join Date: Jul 2008 Location: Δx = ħ/2Δp iTrader: (5) Posts: 3,190 Rep Power: 20	Whoa what did that set you back __________________ For current updates and event coverage check out Follow on Twitter! @WhizbangRally Whizbang Rally's Webpage \| Facebook

12-15-2008, 02:48 PM	#6
Flooder Rotary Fanatic Join Date: Feb 2008 Location: Tucson, Arizona iTrader: (0) Posts: 321 Rep Power: 17	Assuming your car is NA, you'll need a driveshaft too. __________________ AZRX7.COM Red 1991 A-package(SOLD) Red 1990 GXL(SOLD) White 1989 GTUs(DEAD) Red 1988 Turbo II(DD) Black 1988 Turbo II(SOLD) Rebuilt and street ported motor, Garrett T04E Turbo, 3" Turbo Inlet Duct/AEM Dry Flow Filter, Your Mom's MBC, Blitz FMIC, 890cc and 1000cc injectors, Tomei FPR, Walbro, Rtek 2.1 ECU, Taurus E-Fan, Turbonetics BOV, 3" Motoria/Corksport Turbo Back Exhaust, Emissions Removed, Greddy Boost Gauge, Megan Racing Water Temp Gauge, 5one5 Triple Gauge Pod, AEM Uego, GP Sports Body Kit, Fiber Images CF Hood, S5 Seats, S5 Tails, S5 Alt, Dual Alt Pulley, D2 Coilovers, NRG Quick Release, Shook Motorsports Radiator, HID's, AN/Steel Braided Oil Cooler Lines, SUPER JDM TYTE DRIFT BUTTON www.DensetsuMotorsports.com www.AZRX7.Com www.FloodersAdventure.com

12-15-2008, 07:26 PM	#10
Whizbang Respecognize! Join Date: Jul 2008 Location: Δx = ħ/2Δp iTrader: (5) Posts: 3,190 Rep Power: 20	i searched for his stuff and only found them for like 250 __________________ For current updates and event coverage check out Follow on Twitter! @WhizbangRally Whizbang Rally's Webpage \| Facebook

12-17-2008, 04:34 PM	#12
Max777 Pirate Join Date: Mar 2008 Location: Central IL iTrader: (5) Posts: 1,323 Rep Power: 18	Hmm, I really want this and a Turbo rear housing... __________________ Rotaries:They are NOT that complicated!

12-15-2008, 12:30 PM	#3
firzen Rotary Fanatic Join Date: Mar 2008 iTrader: (2) Posts: 231 Rep Power: 17	Huh?

12-15-2008, 02:09 PM	#5
firzen Rotary Fanatic Join Date: Mar 2008 iTrader: (2) Posts: 231 Rep Power: 17	Not too much- around 250 shipped.

12-15-2008, 05:38 PM	#8
firzen Rotary Fanatic Join Date: Mar 2008 iTrader: (2) Posts: 231 Rep Power: 17	Oh really? I thought they were usually more expensive than that. RETed, I think I read somewhere that you ran these things before- are you aware of any differences between these and the FD units with regards to installation? Thanks.

12-15-2008, 07:39 PM	#11
firzen Rotary Fanatic Join Date: Mar 2008 iTrader: (2) Posts: 231 Rep Power: 17	^ Same here, I've only found them for 250. Oh well, the money is spent and at least it's cheaper than buying a new unit from Mazda... Does anybody know whether the earlier model S4 T2 stub shafts work better or do the latter ones?.