The grape juice thing has been debated in great detail. Fructose is a shit carb, and I wouldn't mix my whey with it. Use some dextrose in a whey shake mixed with water, and call it a day.
I might be mistaken, but I think fructose goes through the liver before its release into the bloodstream. That would make the energy boost from fructose kinda delayed. IMHO fructose is better post-workout, but beforehand you want some glucose. Try coolaid
I usually train after my supper so I always have a pre workout food but if I eat some meat I do not have the same amount of carbs that if it was pasta.
SPATTS can you tell me how many grams of dextrose you use?
I guess it's about 60g. I like the Protein Factory Post Training Formula. It's 50% maltodextrin, 25% CFM Whey, and 25% hydrolyzed 520 whey (fastest absorbing whey available). This is the only shake I have ever FELT a difference from. I can be dragging ass BAD after training, and ten minutes after chugging that, I'm a new person.
bilat, no offense my friend, but pay attention. Spatts answered this. Ditch the grapejuice and coolaid. Buy some dextrose or malto from protein factory, supplementsdirect.com, or a few other bulk powder places. You can get a ton of good carbs for dirt cheap. You save money, and get a better carb.
A little carb pre-workout and throughout(but not a lot) and a shitload immediately post workout.