| Re: [video] Corvette Lap @ LeMans |
Subject: Re: [video] Corvette Lap @ LeMans by BillH on 2011/6/20 20:37:13 Quote:
Well, since you asked.  The C6R uses a Xtrac 303 Sequential NON synchromesh transmission (so does the Caddy racer & the GT40). sequential shifters have a straight line pattern (not a H pattern). Yea, it is a manual trans and nothing like the Malibu. it's actually a transaxle. If you've seen the older 4 speeds apart, they have cone shaped, brass syncros with marching surfaces on the gears. when you start to shift, the syncros push into the gears and slowdown/speed up the gear you're going into to make gear speed on the countershaft the same as the engine. This makes for a nice, smooth shift. It also makes them crappy for racing. The Xtrac is a dog ring trans. The dog ring is the piece that fits on the shift fork. Both the ring and the gears have dogs on them, they are squared blocks that inter mesh when you shift. There's no slowdown/speed up of the gears like a syncro. They make shifts extremely fast. This is also where "clutchless" shifting comes in. All you have to do is lift off the throttle and shift, the trans will go into the next gear easily. "Shift without lift" is when the computer recognises the paddle movement and momentarily cuts the spark so the shift can be done. This is what a 3rd and 4th dog ring gear looks like (out of my tranny). The dog ring is the one in the middle. |
