Re: Why don't need their clutch to shift?
- From: SimRacer <NOsimracer68@xxxxxxxxxxxxx>
- Date: Mon, 25 Jun 2007 15:28:02 -0400
On Sun, 24 Jun 2007 18:34:03 -0700, Mark <mblackwell1958@xxxxxxxxx>
wrote:
On Jun 24, 8:14 pm, John McCoy <igop...@xxxxxxxxxxxxx> wrote:
"Kennith" <K.Lech...@xxxxxxxxx> wrote innews:9UDfi.43$oS1.27@xxxxxxxxxxxx:
They showed TS's in car camera and he was just throwing the shifter
around without shifting. Is the clutch electronic in these cars?
No, it's manual. The gears in the transmission are cut differently
from a production car transmission, tho - production gears are cut
helically, which minimizes noise from the transmission but makes it
hard to unload the gears by matching revs. Racing transmission are
straight cut, which are noisy, but if you match revs the gears will
unload (so the engine isn't putting any load on the driven gear,
and the rear wheels aren't causing any load on the input gear) and
then everything will slide freely when you shift.
Most motorcycle transmissions are the same way - I don't use the
clutch to upshift, altho I do to downshift.
John
Its known as the Jericho transmission and has been around for
sometime. It's a shame in a way. Prior to that, it was really
something to watch one of the few decent road racers in the field.
They usually stuck a camera near the pedals so you could see the heel
toe work. Usually it was in say Ricky Rudd or Terry Labonte's car.
The Jericho made shift so much easier it took much of the skill out of
shifting. It also added a great deal of reliabilty. It was common to
have clutch problems prior to that.
Yes, the Jerico or one of its design knockoffs is pretty much what
they use. But also, you still have guys heel/toe shifting, they showed
a bunch of Boris Said doing that very thing on Friday, or Saturday
maybe, in one of the practices, with the "foot cam" in his car.
He'd "toe" the brake with his right foot, punch the clutch with his
left when he was ready to shift, and at the moment of shift would boot
the accelerator pedal with the "heel" of his right foot to blip the
throttle. Like the old days you were talking about. So it's still
done...mainly by road racing veterans, but it is still done. I think a
lot of folks that still do it are what we'd consider endurance racers
(from the Rolex 24, or the Le Mans 24, or the various 12 hours races
left in existance.) I imagine that using the clutch in those
situations is advisable - even with straight-cut gears - given how
many gear changes take place in a 12/24 hour event - and that mindset
carries over into their NASCAR attempts.
.
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