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Welded Diff In Rally Car - Is That Stupid?


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Hey guys. I got my first taste of rallycross in my 1976 2002, and I don't really want to trash my car TOO much more, so I'm considering getting another 2002 and rallyx-ing it. I found something with all the right bones, but after sucking my way through mud with an open diff, I was considering the merits of a welded diff as a cheap way to get some more traction.

Anyone have insights? I've read a bit about its handling on dry ground. How about mud and dirt? Thanks!

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I've raced with a welded rear end (yes, it hurt, why do you ask?)

 

and for rallying in dirt, gravel and snow, it'd be fantastic.  You have a lot of control, and none of

the problems that an open or lower- percentage LSD.  

And a higher- percentage LSD will just behave like a spool anyway when it gets slippy.

 

The other really big advantage is that it's cheap, so you can have spares and different ratios

for little money.

 

Oh, and it generates as little heat as a small- case diff can, since there's only the ring and pinion friction.

 

On tarmac, it's going to be  a mixed bag- you have to learn how to get it to point, or you get turn- in push.

Once you do, it's hardly any slower than a LSD.  Hardly.

 

hth

 

t

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Getting it to point is tricky to learn at first but feels so perfect when you do. Just get the weight transfer spot on and the car will go where you want it to. With a welded diff on tarmac you'll want to initiate your turn just a bit earlier while braking into the corner, then with the rear end still light your going to want to get on the throttle a bit earlier. Think of it like a drift, but without counter steering. Get it right and the car will follow the corner with mostly neutral steering, just being pushed round by the rear end. Watch a good 911 driver (air cooled of course) and you will see what I mean. 911s require a similar driving style, but once you are able to control the car with the throttle as much as the steering, you will be shaving tons of time off your laps.

Edited by Rocan
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