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LSD Options

Old 04-30-03, 10:34 PM
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LSD Options

I have an '84 GSL-SE that I use in club road racing events, and I'm recently noticing wheelspin on the inside wheel exiting corners. I suspect my original LSD with 180K miles on it is ailing. The two options I see are 1) rebuild my OEM friction unit for $?? or 2) use the Miata Torsen unit for approx. $640.

Any comments, first hand experience, pricing info for either option, etc. would be helpful.
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Old 05-01-03, 09:37 AM
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Elwood,

Personally, I would rebuild the LSD.

The Miata Torsen is a nice piece to have during a rain race, but the worm gears generate a ton of heat and driveline restriction. On a dry track, I'd much rather have the LSD in my racecar.

The bonus is that it's cheaper to rebuild your LSD than to spend the $600+ on the Torsen.
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Old 05-01-03, 02:43 PM
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my dads car's LSD was just rebuilt and it is seriously almost a locked diff. even with the redline LSD application fluid, its TIGHT. go with the rebuild
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Old 05-01-03, 08:38 PM
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Thanks for the advice. How much do rebuilds cost? I've rebuilt engines, including the 13B in my car -- how difficult is a differential? Do I need special tools?

I remember reading that the pinion to ring gear engagement pattern was crucial, but do I really need to alter this relationship if I'm changing the friction packs?
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Old 05-02-03, 10:37 AM
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Rebuilding a diff is a lot easier than doing a motor. You need to make sure the gears align and mesh properly, and you need a measuring device so you can set and check the backlash according to spec. Other than that, it 's a piece of cake. Make sure you buy a new crush tube and torque everything to specs. You're looking at less than $100 in parts and an hour's work (once the pumpkin is out of the car). for racing purposes, make sure you buy the over-sized friction plate from Mazdaspeed. It tightens everything up nicely.
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Old 05-02-03, 07:41 PM
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im not sure how much it cost for it on the race car... cuz the price included and engine rebuild and oil cooler and oil line repair.
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Old 05-02-03, 09:09 PM
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Thanks again. It looks like I'll be doing it myself. I'll let you know how it works out.
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