Get a C4 Corvette with a ZF 6 Speed and you can do 1st gear while
rolling without double clutching at least to 20 MPH. Also, you can shift
into reverse while you are rolling forward up to at least 15 MPH and
maybe 20 MPH.
Double clutching is way too much work.
Bill Hamburgen 650-617-3329 FAX -3374 wrote:
>
> Michael, Have you tried double-clutching? You'll probably find
> that lugging in 2nd gives faster times, but it's nice to be able
> to grab 1st if you really need it.
>
> Just in case you're not familiar with the practice, a double-clutch
> 2nd-to-1st downshift is done as follows:
> 1 - push in clutch, shift 2nd-to-neutral, release clutch
> 2 - blip throttle momentarily (to match revs in next lower gear)
> 3 - push in clutch, shift neutral-to-1st, release clutch
> With a little practice, it can be pretty quick. If your pedals are
> positioned and adjusted correctly, you can can use the ball of your
> right foot to brake while you use the right side (or heel) to blip
> the throttle. This is the "heel-and-toe" manuver.
>
> I used to be really good at this when I owned a 1955 Porsche with
> a tired 1st gear synchroniser. The car had lived the first 10
> years and 30k miles of its life in the US Virgin Islands.
> 4th gear was indeed virgin.
>
> /Bill
>
> --------------- forwarded message ----------------------
> Date: Fri, 05 May 2000 16:24:00 -0700
> From: "Michael R. Clements" <mrc01@flash.net>
> Subject: Re: best line
>
> Sure, the rear end ratio would be included if one is measuring
> the total gear ratio from the crankshaft to the wheel. That would
> be the transmission ratio multiplied by the differential ratio.
> For example, in my RX-7 1st gear is 3.483 and 4.1, which amounts
> to 14.2803, which means 225 ft. lbs. at the crank is converted to
> 3,213 ft. lbs. at the wheel. Incidentally, divide that torque by
> the wheel radius, divide by the mass of the car and you have more
> than 1 g of acceleration in 1st gear which thanks to lofty rotary
> redlines goes to just over 40 mph.
>
> Too bad I can't get it into 1st when it's rolling anything faster
> than 10 miles per hour.
>
Kenneth Allan Mitchell
mailto:nokones@ix.netcom.com
|