the last time. ended up having a bad alternator and the fuel pumps were bogging down up top, causing it to lean out bad. that little issue reared its ugly head on the first few pulls on the dyno. I was baffled for a while until i put a volt meter on the batter under load. Dynos are good for catching stuff like that i guess :)
I guess with the efans and dual fuel pumps the alternator is important ;)