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 915
Gate Shift Kit
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Avoid
the Over-Rev
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Vehicle:
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1970
911 RSR 2.8 Replica
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Track:
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Road
America
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Tracking
down a GT350 Mustang
(click
to download this
movie,
about 6.5 Mb, MPEG format)
Chris Streit in his '70 RSR-bodied 911
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This
short video clip illustrates a mis-shift resulted
in significant engine damage. Due to the remote
location of the shift housing, 911s are more
susceptible to a missed shift than other vehicles.
The Gate
Shift kit
helps prevent this from occuring.
This
mpeg clip is approximately 30 seconds long. About
26 seconds into the video, listen for the
split-second mis-shift from 3rd into 2nd (instead
of 4th). Although this event happens quickly in
this highly stressful environment, it was just
enough to damage the engine.
(Video
courtesy Chris Streit)
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"I
was pushing very hard at Road America exiting The
Carousel corner #9 at the top of 3rd gear,
approaching 100 MPH. This year I switched to the
GTO class where the average car has 2-3 times the
horsepower of my 911 so I have to hustle. The
G-forces in this turn force the driver hard to the
left side of the car.
As
I attempted the 3-4 shift I pulled the selector at
a slight angle unknowingly into 2nd gear. As you
can see in the video, the clutch was only out for a
few 10ths of a second, but it was enough to force
the engine well past redline."
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Engine
damage pics (click for larger images)
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"The
end result was 6 well-bent exhaust valves, a
shortened weekend, cracked valve guides and
required a full teardown to repair and re-measure
the tolerances."
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Engine damage pics (click
for
larger images)
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Other
examples of engine damage from over-reving the
engine.
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Gate Shift kit installed in Chris Streit's
track car (click
for
larger image)
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Update:
"I have since installed the
Seine
Systems
915 Gate Shift Kit
as
insurance against this problem.
It
was clear that the design would discourage this
sort of accidental motion with the lever
re-centering, and the detents on 1-2. I also
received an added benefit. I discovered that it
really made for a more intuitive shift pattern
through the gears, as 915's tend to be a bit loose.
My shifts are much more smooth and I spend a lot
less time worrying about what gear the lever is
going into. The kit made me more comfortable with
my 3-2 shifts because the added lever guide gives
the shift a more "positive" feel.
So
I am very satisfied not only with the mechanical
benefits , but also that my mind is able to be off
my shifting and back onto the track!
Thanks
for a great kit!"
Chris
Streit (owner/driver)
Streit
Racing
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