Tech, Repairs, Upgrades > Aftermarket

XR2 LSD

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yen:
Well that solves that then
Thanks for the additional info Rocketman

Rocketman:
EDIT: Merged this & following posts into one thread

Thought I'd post this up and sticky it for those of you interested.

MFactory now makes a Helical gear style LSD (limited slip differential) that will fit in the XR2's transmission. It will help prevent one-wheel wonders, torque steer, and replace the weak factory diff with one that has been proven to hold 900+ HP
(much more than the rest of our gearbox could ever hope to handle)

Here's the link to their ordering page:
http://www.teammfactory.com/helical-lsd_Mazda

You'll want the one for the Mazda G-Series box w/ 26 spline axles.

The 28 spline diff is used in the V6 and later style gearboxes and won't work for us.

If I wasn't AWD I'd be all over this thing!

coco-customs:
So what is the weak points in our trannys? Is it the diff. or is a combo of things?? Is it really worth the $700??

Heavensheros:
i will be getting this after i get my exhaust on !! will help ALOT with traction and torque steer ... buddy supercharged his sunfire ... and got one of these ... the before and after is unreal

Rocketman:
Its a combo of things.

The diff rollpin has a tendency to shear, and throws the spider gears out of the diff and thru the casing. This has personally happened to me, sucked bigtime. It happened shortly after I got my 2nd XR2, PO had let it run real low on fluid and caused all sorts of problems in the tranny. The rollpin can also shear if you have excessive wheelhop or if you do too many crazy one-wheel wonders. (if you're ever in there weld the pin in place! it won't keep it from shearing but it will prevent it moving)

At high HP/Tq levels 3rd gear tends to strip. I haven't seen this on a Capri, but the Probe/Escort guys, and some GTX guys have experienced this. This is caused by the helical cut gears forcing apart under high torque, making only the tips of the gears contact which will shear off. (3rd gear is roughly in the middle of the two shafts in the transmission where shaft deflection would be at its maximum distance) Overall this is caused by a number of conditions:
-Case flex. The Gtype case is fairly thin and lacks reinforcement in some spots.
-Unseated bearings. Perhaps 'unseated' isn't the proper term - but the bearings in the case can spin in the housing over time wearing their seats away. This allows just a bit of play, which can be fine but when putting extreme power thru it can be catastrophic.
-Just way too much torque, lol. Our gears are barely 1/2" wide. Compare that to something like an MTX75, their gears are near 3/4" wide. You can only put so much power thru them.

Now on the AWD transmission there are some different dynamics coming into play because it has a larger casing and a transfer case adding additional torsional load. And on the other cars, such as the probe, the car is heavier adding additional stress.

Is the LSD really worth it? I'd say its probably one of the better things you'll ever do to the car. The folks over on ClubProtege are raving about them.

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