What is it you're under driving? The crank? Or just the alternator and power steering?

I think people are a little afraid to comment because four years ago when we were buying our cars we were warned against under driving the crank pulley, and told flat out it would void the entire power train warranty.

In consequence of that, I'm not sure that many of us are using pulleys at all...but it's been four years and perhaps we should reconsider our position, in view of how much other work we're undertaking.