Evo3 center differential

[Apeximprt2nr]

I'm confused as to why a 50/50 split is less desired than say 35/65 that was stated above? jtmcinder care to chime in?

 

[slipstream808]

While I'm not jtmcinder (meaning I don't have his knowledge base), I'll chime in with my input.

Short answer is the car will behave and handle more like a RWD car and will therefore be more inclined to oversteer. This will make the car easier to point in the right direction based on steering using the throttle inputs.

 

[jtmcinder]

If a welded "50/50" center diff goes from 0-100 to 100-0 from one instant to the next (depending on traction). So then what happens to the 35/65 center diff when it looses traction on one set of wheels?

Same thing as any other diff: if there's no limited-slip device, the power goes to the end with less traction.

I'm confused as to why a 50/50 split is less desired than say 35/65 that was stated above? jtmcinder care to chime in?

For straight-ahead traction, you want the torque split to match the weight. A good launch probably gets at least 65% of the weight onto the rear. Also, for rotating the car at lowish speeds, nothing is as fun as power oversteer.

As for the 35/65 I'd imagine it'd behave just like any worthwhile LSD would. It'll either out and out lock 35/65 and wont care (clutch type) or it'll send 65 to the front and 35 to the rear based on optimal traction conditions (Quaiffe type). If it were open... umm well I dunno if you can torque bias with an open that well. That's outta my league. I'd most likely say that it'd be a clutch type and therefore should just always be 35/65ish.

What a fascinating post. First off, a 35/65 is a planetary diff, so it has no built-in limited-slip. You have to add a piggy-pack, such as a VC or a electronic clutch. Second, I have no idea why it would ever switch to being 65/35, in particular. I suppose that might be true for a random moment if the piggy-back LSD were at least partially locked and the fronts had more grip, but it would a very rare moment. Third, you cannot use helicals in a planetary, so drop the whole Quaife-35/65 idea. Lastly, as suggested above, a planetary is always open. A limited-slip device must be piggy-backed onto it. Read the FAQs at the top of the forum to see how they work.

- Jtoby