EspaceF1Fan

Besides the 8.8 setup everyone is using, are there some factory options for differentials? Will RX7 or RX8 diffs work? Do they bolt in? I'm just curious what kind of options I might have. I'm probably about to trade my Msutang for a Miata, and a good friend of mine just gave me a pile of LS1 parts, so I obviously have only one choice....SWAP TIME!!!!

rotor vs. piston

iTrader: (3)

Racing Beat may have some options for you or flying miata.

http://www.racingbeat.com/FRmiatamain.htm

sm2dan

iTrader: (2)

I'm running the Getrag stage 1 from Flyin Miata
http://flyinmiata.com/index.php?dept...002%20%208.8S1
using a 3.42 LSD from a 2006 Cadillac CTS

d

R-Bo

Was just about to say call Bill at Flyin' Miata...

EspaceF1Fan

Thanks for the info guys!!!

Ls1Mx-5

iTrader: (3)

The best route is the rx7 turboII LSD. Not only does it bolt into the stock location, but has mounting points for a torque arm

sciff5

iTrader: (1)

Where are the mounts on a t2 diff for a torque arm?

You might be thinking of an FD diff which came with a torque arm, turbo 2 diffs in the FCs didnt have torque arms

Ls1Mx-5

iTrader: (3)

This is what I have. 86-88 (I think) 'TurboII LSD'.



There are three mounting points for a torque arm whether rx7s originally had them or not.

sciff5

iTrader: (1)

It might be a t2 diff but those 3 bolts arent for a torque arm. THey are what the front diff mount connects to.



You could use the bolts with a torque arm though prob, as it works similarly

Ls1Mx-5

iTrader: (3)

Thanks for the picture, that helps allot.

Project GatTagO

iTrader: (7)

TII aluminum housing + 1988 929 carrier with 3.73 gears + TII diff = direct bolt in factory rear end with limited slip and 3.73 gears.

http://picasaweb.google.com/alaivins...78269943330050

Andrew

Dan_W

Are there any gear sets available for these (numarically lower) in the 2.70-3.30 range?

Who has one in their car?

sciff5

iTrader: (1)

So why arent more people running this setup in the Rx7s?

Looks like the issue would be that the diff is shorter thus the rear flange will hit the rear subframe.

Project GatTagO

iTrader: (7)

Exactly. You are also faced with the other weak points, such as the stock stub axles and CV axles. However, I feel that in a light weight Miata, those weak links would not be so apparent. I think that a 929 carrier with the 3.73 gear will live a happy life in a Miata, mostly because Miatas are so traction limited. Wheel hop will also need to be controlled.

Andrew

Project GatTagO

iTrader: (7)

The only other ring and pinion that is available for TII rears is a 4.33.

Who has what exactly, in a car?

Andrew

Ls1Mx-5

iTrader: (3)

Mine is going to be mounted in this week. It has 4.10 gears

Dan_W

Who has this rear end in thier miata.

Ls1Mx-5

iTrader: (3)

The guy who said these only come with 4.33 gearing is wrong. We tested the ratio of mine and it was 4.10

NMJ87T2

iTrader: (26)

Foreign models had the 4.33 option. I can give you a Mazda part number if you are interested. Well here is a link for some info for everyone.
http://www.mazdamotorsports.com/pdfs...Drivetrain.pdf

Dan_W

Does anyone make other gear ratios for it... aftermarket, etc?