Quote Originally Posted by spfautsch View Post
If you're referring to tripping the ABS, it's because kur4o has speculated that might be the only time ATDC timing is commanded by the PCM.

If your question is more broadly asking what does retarded spark achieve that would be for torque management - i.e. traction control, abs, between gears on a slushbox (auto trans), etc.
Sorry, must have missed that bit!
Thanks
Mitch