[Jeff20B]

Hey Dave, thanks for your input. I have a 5" SC that has a -7 pulley and it has always sucked; takes forever to get into boost, will only boost under high load conditions like going up a steep hill etc. It came like this from Atkins during the days when they were recommending 7" SCs for everything (we had to special request the 5") so ending up with a -7 pulley where it clearly was incorrect for the application was probably an honest mistake on their part since -7 pullies works so well on 7" SCs. We also recieved the wrong length belt for the 5", sure enough. It is the correct belt for a 7" SC with a -7 pulley, but was way too long for a 5", even with a -7 pulley. I had to get a shorter gatorback, which stretched a little and caused the alt to need to be lifted to its maximum on the bracket, and it would still slip sometimes.

My friend has a 7" SC in his REPU with a -8 pulley and it seems to have problems such as belt slipping even thought it's tight as heck, even while still in vacuum before it transitions from vacuum to boost; sounds like marbles rattling around in a coffee can, belt shredding (black shavings everywhere) etc. He's been too busy to deal with it. He also has a 5" SC with a -10 pulley in a rotary converted 510. He doesn't like how quickly the boost kicks in and would like to try a -8. I'm not going to argue with that because it means I'll be able to get his -10 pulley and a good used belt.

So I suggested this:

My 5" SC will get his -10 pulley and his good used belt (nothing for me to buy, hehe)
His 7" SC will get my -7 pulley and the new belt that Atkins supplied with my 5" SC which was too long to fit a 5", but fits a 7" with a -7 pulley perfectly.
His 5" will get his -8 pulley and he will have to buy one new belt.