WELDED DIFF for autox??

[1wayIsSideways]

I am buying a new 240 this weekend and it has a welded diff. I road race in the mountains of N.C. = very sharp and windy roads. My last car had a open diff and i didnt see much problem with it. Is a welded diff a bad choice for autox?? thanks

[bone_stock_240]

Yes, welded is bad for autoX, especially with all the tight turns. VLSD would be better, or I have heard great things about the S15 helicals.

[1wayIsSideways]

S-15 helicals seems to be the most popular. is it a direct it into an s-13?

[bone_stock_240]

I believe so. I think there is a minor difference when it comes down to the ring gear bolts, but I am not sure. There was a thread about the install, so you could try searching for that.

[Red coupe]

S-15 helicals seems to be the most popular. is it a direct it into an s-13?

Generally you have to drop it into your old case, re-use your old rind gear and the output shafts that came with the diff. The output shafts have a a different spline count.

The S13 diff uses 12mm ring gear bolts, while the S15 uses 13mm bolts.You can find more about that with a search.

Also

I road race in the mountains of N.C.

[Chukidori]

I road race in the mountains of N.C. = very sharp and windy roads.

Racing on the Toe-gay? Too-Gay

[AmoebAssassin]

Touge is a legitimate way to practice skills. However, it is dangerous to yourself and your car, and even worse, to others. So make damn sure to have spotters and radio to let you know whats up if you're going to attempt touge.

As far as welded diffs go, they're a big no-no for autox.

Welded diffs and clutch diffs are acceptable for road races, where typically, speeds are high and steering angles are low (and rear wheel speed difference is consequently low as well).

With autoX, it is the exact opposite -- speeds are low and steer angles are high, resulting in large rear wheel speed differences. If you use a clutch or a welded, you'll run into wheel hopping and understeering. This effec tis magnified by high-grip tires where the yaw stabilizing moment you generate by dragging the inside tire will be great, making the car reluctant to rotate in tight corners.