The quality must vary from car to car. My friend's C4 Vette and
ZF 6 speed tranny couldn't get into 1st (or 2nd) -- only 37k
miles on the car -- had to get replaced, out of warranty. Not
easy to do; $4k and many hassles later he got a working tranny
and now he's afraid even to try anything like that.
Kenneth Allan Mitchell wrote:
>
> 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
--
Michael R. Clements
mrc01@flash.net
We must make clear that communism and the governments it now
controls are enemies of every man on Earth who is or wants to be
free.
-- Barry Goldwater
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