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Originally Posted by Gr3y Goose
bleached thats basically the same thing i said LOL
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It's not the same thing unless I misunderstood your post. With rev matching, you disengage the clutch (press the pedal) and get the revs in line with whatever gear you're shifting into. That means blipping the throttle for a downshift or waiting a sec for the revs to drop for an upshift. Then you let the clutch out and you're in the next gear. You never let the clutch out while in neutral. With double clutching, you disengage the clutch, put it into neutral, then enagage the clutch (let off the pedal). While in neutral you blip the throttle or wait for the revs to drop, then you disengage the clutch and shift into gear. You're basically shifting into neutral, then rev matching, then shifting back into gear.
Like Bleached said, it was necessary back in the day when cars didn't have synchros. Now they do so it's not necessary. It might help with racing or perhaps lengthen the life of the transmission and/or clutch. I don't know, I've never tried it and don't really see the need to. For most people rev matching should be enough to help preserve the synchros and provide for smooth shifting.