Superformance Entry
Dennis Olthoff and Rick
Lee in Superformance Coupe No. 5
Dennis scored first in class
and fourth overall in 1999 in a Mk III with Doug Reed as co-driver, second in
class and thirty-sixth overall in 2000 after recovering from a blown engine in
Coupe Prototype No. 1 with Mark Ray as co-driver, and first in class and tied
for second overall in 2001 a Mk III with Rick Lee as co-pilot. The co-driver for
2005 is again Rick Lee, a well experienced One Lap veteran who has co-driven a
number of successful efforts in years past.
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Coupe No. 5 has an excellent
history, having served as the test data car for Car and Driver and bringing
home a truckload of trophies from Run and Gun last year. |
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The Run and Gun engine went in
Peter Brock's personal Coupe, No. 73. For One Lap 2005, Dennis built a 412
cubic inch all aluminum Windsor with very trick heads.
The intake ports were so high that an adapter
plate was required to match the single plane manifold. A tasteful hood bulge
was added to clear the Holley HP 830 carb and 14x3 air cleaner. It all fit.
A set of custom headers were also required to match the rather large exhaust
ports.
Only three pairs of these super high flowing
heads were ever produced and Dennis has two of them. So don't even bother to
try and find some. |
 |
The Team put in some long hours
of good solid development work to get Coupe no 5 ready for the One Lap.
From left to Right: Jack
Allen, Mike Stenhouse (gopher), Jaymes Graham, Mark Ray, Merlin Pogson, Dave
Yeager, and Dennis Olthoff. |
Specifications
Engine
Bore: 4.155
Stroke: 3.800
CID: 412
Cam: Solid roller
Rockers: Jesel shaft mounted
Intake: Single plane
Carb: Single Holley HP 830
Oil system: Dry sump with oil tank in right rear fender well
Power: 684 at 6800
Torque: 581 at 5600
Redline: 7300
Transmission: Tremec TKO-600 5-speed with close
ratio 5th
Rear end: 3.46 ratio
Tires
Front: 255/40 ZR 18
Rear: 285/45 ZR 18
Performance
With this setup, the speeds in
gears are:
1st
60 @ 7000
2nd
91 @ 7000
3rd
130 @ 7000
4th
172 @ 7000
5th
209 @ 7000
That's right - rpm limited at
209 mph in 5th.
Projected acceleration is:
0-30
1.4 sec
0-60
2.8 sec
0-100
6.7
sec
0-150 13.0
sec
1/4 mile 10.9 sec at 135 mph
This Superformance coupe is a
good bit more powerful and faster than previous Superformance entries. But the
competition is a lot tougher. The challenge will be the tires. They are a bit
narrow and a bit tall. Getting the power to the pavement may be difficult.