[A4] A4 clutchless shifting
jafo-audifans at tummy.com
Thu Apr 19 06:03:20 EDT 2007
On Thu, Apr 19, 2007 at 03:22:03AM -0400, T. Jackson wrote:
>shouldn't need a clutch replacement so soon. If driven correctly, clutches
>should last much longer. Just curious. How many miles/kilometers on his
Indeed. I have a '97 A4 2.8Q with 160k miles on it's original clutch. And
my friends agree I don't baby it when I drive it, but I also don't hammer
the clutch. I've been expecting to have to replace the clutch for years.
This isn't a "highway miles" car.
On the topic of "clutchless shifting" (also called "speed shifting" and
"rev matching", when I was farting around with it in my youth)... A
new-ish Audi isn't the machine to be learning it on. Who actually thinks
it's a good idea to risk damaging a transmission to save the cost of a
clutch? If your friend thinks a clutch replacement is expensive, I can
only imagine what they'd think of a transmission rebuild.
It can be done. I tried to learn it on my '69 Datsun B-210 when I was
learning to drive in '87-ish. The whole car cost less than a clutch
replacement for an Audi, so...
I was able to successfully do it, where success is defined by actually
ending up in the destination gear. A handful of times I was able to do it
without crunching gears. The vast majority of times I was not. I can only
imagine that it was really hard on the synchros doing this.
Of course, this ignores one thing... Rev matching shifting only works when
you're moving. If you're at a full stop, the only way to rev-match the
engine is to turn it off. If your clutch totally goes, and you're in, say,
a really bad neighborhood... You can turn off the engine, put it in first,
and start the engine to get going, then rev-match beyond that. Naturally,
it will NOT be a smooth launch.
One thing I will say though... To this day I rarely use the clutch when I
come *OUT* of gear to neutral. Rev-matching the engine to the road is real
easy when you're in gear. If I'm coming up on a stop sign or light, I will
often rev-match and go into neutral, instead of hitting the clutch. If I'm
going into another gear though, I always use the clutch.
Also, if I've been out of gear and need to come into a gear (say, the
light changed after I went into neutral), I'll usually make a half-assed
attempt at rev-matching the engine before hitting the clutch, to spin up
the input side gears before hitting the clutch and pulling the transmission
Those are two real-world applications of rev matching shifting that I still
use, but I don't try shifting between gears without the clutch.
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Sean Reifschneider, Member of Technical Staff <jafo at tummy.com>
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