damn ... guess its an open :(
#1
Elite Member
Thread Starter
iTrader: (5)
Join Date: Jul 2006
Location: Central California
Posts: 2,557
Total Cats: 5
damn ... guess its an open :(
Oh well at least it was free, 7", and has more options for the guts. I just dont understand, i thought all miata's 94-97 with manual transmission and non base model recieved the torsen, well I guess i was wrong. Didnt make the car not fun to drive though. So should i go with the rx7 diff guts?
#4
Supporting Vendor
iTrader: (3)
Join Date: Jul 2006
Location: San Diego
Posts: 3,303
Total Cats: 1,216
The Torsen is not very good anyways. You got exactly what you need - the 7" diff housing and gearing. Now go grab the LSD guts from an RX7 and you are good to go. I'd go with the 4.1 since you are only at 4psi... if you plan to up that a bunch the 3.9 may be better.
Great find though! Howd you get it for free??
-Ryan
Great find though! Howd you get it for free??
-Ryan
#5
Elite Member
Thread Starter
iTrader: (5)
Join Date: Jul 2006
Location: Central California
Posts: 2,557
Total Cats: 5
Ya im not too pissed because i figured eventually i would have prefered to have the clutch LSD instead anyway. I am only 4psi now, but my megasquirt is sitting next to the monitor as i type along with 550cc injectors. So hopefully 15psi is not too far off, id go with the 3.9 ... actually i didnt even know that the gearing ratio was dependant on the guts of the diff, thought that the pinion gear and ring made that.
#7
Boost Czar
iTrader: (62)
Join Date: May 2005
Location: Chantilly, VA
Posts: 79,688
Total Cats: 4,113
plus Torsens are running $600-800 for just the LSD. 86-88 RX7 Clutch-type LSDs are in the $150-250 range, and are superior for our applications (Torsen might do better at an autox, however).
#8
2 Props,3 Dildos,& 1 Cat
iTrader: (8)
Join Date: Jun 2005
Location: Fake Virginia
Posts: 19,338
Total Cats: 573
just this morning my KAAZ saved my *** from gettin stuck on ice. half the alley was covered in ice. right wheel spins, left wheel grabs for traction and I drive to work. I might still be there pushin my **** without that.
interesting sidenote, the KAAZ stacked for 100% locking (all opposing plates) still allows quite a bit of differential action. If I had to guess the power was 66.66/33.33 in favor of the slipping wheel. still enough to move easily though.
interesting sidenote, the KAAZ stacked for 100% locking (all opposing plates) still allows quite a bit of differential action. If I had to guess the power was 66.66/33.33 in favor of the slipping wheel. still enough to move easily though.
#10
Supporting Vendor
iTrader: (3)
Join Date: Jul 2006
Location: San Diego
Posts: 3,303
Total Cats: 1,216
(Torsen might do better at an autox, however)
Guys in SM2 with boost however much prefer the Clutch diff...
-Ryan
#11
Elite Member
Thread Starter
iTrader: (5)
Join Date: Jul 2006
Location: Central California
Posts: 2,557
Total Cats: 5
thanks ThePass, thanks for letting me know i have the choice to swap pinion gears as well because i did not know that. In that case, i would almost be tempted to run the 3.9 gear as Im planning on 15psi down the road ... hmm so many options.
#15
Boost Czar
iTrader: (62)
Join Date: May 2005
Location: Chantilly, VA
Posts: 79,688
Total Cats: 4,113
A stock clutch type RX7 diff will outperform the Torsen in an autox - I've tried both in different cars... most autocross cars use the Torsen because they are allowed update/backdate between miatas but they can't use stuff from the RX7.
Guys in SM2 with boost however much prefer the Clutch diff...
-Ryan
Guys in SM2 with boost however much prefer the Clutch diff...
-Ryan
The RX7 "short" pinon, will work, but it needs to be a matched set to the ring-gear as the each have different teeth.
#17
Boost Czar
iTrader: (62)
Join Date: May 2005
Location: Chantilly, VA
Posts: 79,688
Total Cats: 4,113
But your 1.8 miata pinon should have 10 teeth, correct? if you put your RX7 ring gear on there with 49 teeth you'll have a 4.9 end-ratio.
It really as easy as counting the teeth and dividing (ring / pinon = end ratio). Just double-check and make sure. I'm thinking of using the RX7 ring and pinon to achieve a 4.08 end ratio.
It really as easy as counting the teeth and dividing (ring / pinon = end ratio). Just double-check and make sure. I'm thinking of using the RX7 ring and pinon to achieve a 4.08 end ratio.
#18
Interesting statement.
To be honest, most people who think they need a Torsen wont realize any real benefit over a 1.8 open diff...other then a psychological one.
That is not to say there isnt any performance gain to be had from torsen in a specific circumstance, its just that MOST people rarely drive at a level where they will really benefit from one.
To be honest, most people who think they need a Torsen wont realize any real benefit over a 1.8 open diff...other then a psychological one.
That is not to say there isnt any performance gain to be had from torsen in a specific circumstance, its just that MOST people rarely drive at a level where they will really benefit from one.
#20
Elite Member
iTrader: (9)
Join Date: Aug 2006
Location: Concord, North Carolina
Posts: 4,160
Total Cats: 6
From everything I've read it's the opposite. Since the way the clutch engages, responding to driveshaft torque, it is not perfered in low-speed autox corners. It's typically the reason there is such an availibilty of rx7 LSDS, since they all tend to upgrade to a miata/s2000 torsen. Road courses and Drag events on the otherhand....
On this note, I found a guy w/ a complete torsen w/ hubs on the axles locally!