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"Porsche
motoring is and always will be driving in its purest form."
Ferry Porsche
Special
Thanks to............................................Jerry McDermot
Special Thanks to....................................................Jeff
Amos |
Table
Of Contents:
A. Proper Seating for Maximum Awareness and Car Control
B. Heel and Toe Downshifting
C. Under-steer and Over-steer (cause and correction)
D. Trailing Brake Technique
E. Explanation of General Terms in Racing and High Performance Driving
F. Advanced Street and Highway Driving |
| G.
Techniques: |
a.
Up shifting
b. Downshifting
c. Cornering - Diagrams & Discussion
d. Waterford Hills Corners |
| H.
Agenda |
a.
Braking Distances
b. Flags |
| I.
Notes & Track Diagram |
SMOOTHNESS!
CONSISTENCY!
CONCENTRATION! |
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We
will stress these words here again and again!! Every technique you
will learn
here should be executed smoothly and consistently. To achieve this,
you will
have to concentrate 100%.
Four
tire patches are the only contact areas you have with the road while
driving
your car. (Tire patches are the part of the tires that touch the
road.) You will
learn to be sensitive to and read the signals that are picked up
by tires and
transferred to the wheels, suspension, car seat, and then, in turn,
to the
steering wheel and pedals such as throttle, clutch and brake.
You
will learn to work with your car as one unit and will also learn
to consider it
less "your living room on wheels," but a machine that needs to be
driven with
alertness, awareness, and constant preparation for emergency situations.
The
following will introduce you to some simple and some very complex
techniques
and ideas, which will help you, become a better street driver or
race driver.
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A.
PROPER SEATING FOR MAXIMUM AWARENESS AND CAR CONTROL
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1.
Car Control:
This is the ability to drive a vehicle with maximum control at all
times under any
situation. It requires awareness of your surroundings including
other vehicles on
the road, road conditions, potential problems or accidents.
Under
all conditions, you have to understand some basic areas of car control
and
weight transfer. When you drive a car, you are moving weight under
your control.
The weight of the car rests on four tire patches. This is the only
area of contact
between the road and your vehicle. Under braking, as you transfer
weight to the
front tires, the front tire patches Increase in size. Under acceleration,
as the
weight transfers to the rear of the car, the rear tire patches increase
in size.
When entering a corner, you want the maximum size of tire patches
on your front
wheels to provide maximum adhesion and better steering control.
To get this, you
slowly ease the brake pedal pressure off as you turn the wheel into
the first one-
third of the corner.
You
then apply your throttle gently to transfer the weight to your rear
tires to
prevent the rear of your car from spinning while you are exiting
the corner. You
should avoid any abrupt input of brakes or throttle because you
are then upsetting
your car's stability. Any abrupt weight transfer can cause a spin
or slide and can
cause you to lose control of the car.
2.
Proper Seating:
The buttocks should be tucked firmly against the lower back of your
seat. With
your back erect and against the seat. This seating position will
keep you alert and
the total contact of your body with your seat will feed back valuable
information
to you about the road conditions, your car's suspension and tires.
The distance
between your steering wheel and seat should allow your arms to be
comfortably
bent when you hold the steering wheel. This will allow you to react
quickly with
full use of your arms in case of emergency evasive maneuvers, and
will also be
less tiring on your arms.
3.
Proper Position for Hands on Steering Wheel:
Your arms should
be slightly bent at the elbow (refer to proper body placement
for your car seat) with your hands located in the 3 and 9 'o clock
position on the
wheel with thumbs resting on top of the spokes. Holding your steering
wheel in this
fashion will allow you to sense first-hand information fed to you
through your
steering column into the wheel. You will find that you have more
strength available
while maneuvering your car. Your arms will get less tired, and in
case of emergency
evasive maneuvers, you will have all that extra strength to help
you. Let both
hands do the work! While one pulls, the other can push the wheel
smoothly!
4.
Feet and Legs:
Picking up vibrations from the brake, clutch and throttle pedals
are also very
important. Use the ball of your foot on the brake pedal, with your
heel off the
floor so you can feel the pressure you apply. This allows you to
feel when the
brakes are beginning to lock up the wheels. Legs should be slightly
bent when fully
extended to the pedals so you don't have to stretch the legs and
feet.
Smoothness
is very important. Any sudden input of brake, throttle, clutch or
steering will cause sudden weight transfer in your vehicle and lessen
your car
control. It may also start a skid or accident!
5.Seat
Belt:
Your lap and shoulder belts should be fairly tight with just enough
room to allow
you to reach the dashboard controls. Seatbelts are important for
several reasons.
They will hold you in place and keep your body tucked into your
seat for maximum
feel and feedback. In case of emergency evasive maneuvers, they
keep you in
place behind your steering wheel, instead of having you slide around
the front seat.
They will keep you from hitting the steering wheel or windshield
in case you have
an accident.
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B.
HEEL AND TOE DOWNSHIFTING
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1.
Shifting:
Cup your hand on top of the knob and gently guide it into first
gear with the heel
of your hand. Now, use your fingers to move it into second gear
and then into
third gear. Now, gently ease it into fourth gear. Treat the gearshift
lever knob
gently as if it were fragile, like an eggshell. Don't grab or yank
it into gear. You
may get into the wrong gear or destroy your transmission. Most transmissions
shift smoothly if you just guide the shift lever into the proper
gear in a smooth
manner.
2.
Heel and Toe Downshifting:
This is the technique
of operating the brake and gas pedal simultaneously with
the right foot while clutching with the left foot. If your car has
an automatic
transmission, this does not apply to your kind of driving.
Heel
and toe downshifting allows you to brake and match the engine rpms
with
rear wheel rpms which allows for smooth downshifting.
Here
is how it is done!
First
you start to squeeze on the brake pressure to slow down the car.
Then
pivot the heel or side of your right foot onto throttle, maintaining
even brake
pressure. Depress the clutch with your left foot, moving the shift
lever into
neutral on your way to the next gear. On releasing the clutch halfway,
squeeze
the throttle on to bring up the engine's rpms. Depress clutch again,
quickly, and
shift into the next lower gear. Release the clutch smoothly, then
pivot your right
heel off the throttle back to below brake pedal and continue trailing
brake. This
technique is called heel and toe downshifting with double clutching.
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C.
UNDERSTEER AND OVERSTEER (cause and correction)
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| 1.
Understeer- a front wheel skid: |
| Cause: |
1.
Too much speed in a corner in an inherently understeering car
(front engine). |
| Correction:
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1a.
Correct by easing off throttle half a throttle setting to
transfer weight to the front wheels; add steering to get proper
line back. If need be, back off the throttle all the way and again
add the steering correction. |
| Cause: |
2.
Too much braking, which causes front wheels to lock. |
| Correction: |
2a.
Ease off brakes smoothly or reduce brake to get front
wheels unlocked (or rolling), add steering to get proper line
back. |
| Cause: |
3.
Violently spinning front wheels (front wheel drive car). |
| Correction: |
3a.
Ease off throttle to stop front wheels from spinning and to
transfer weight to front tires; add steering to get proper line
back. Then apply throttle progressively, adjusting as necessary. |
| 2.
Oversteer - a rear wheel skid or slide: |
| Cause: |
1.
Too much speed in a corner in an inherently oversteering car
(rear engine). Rear end slides out. |
| Correction: |
1a.
First add steering quickly into direction the rear end is sliding.
On dry pavement, add some throttle to transfer weight to the
rear wheels. When rear end starts coming back, correct steering
quickly into opposite direction to counteract second skid. As car
comes out of second skid, bring wheel smoothly back to straight
and continue on proper line. |
| Cause: |
2.
Braking too hard causing the weight to transfer abruptly
forward which causes the rear wheels to lock. |
| Correction: |
2a.
Come off brakes quickly and add steering as rapidly as
possible into the direction the rear end is sliding. When rear end
starts coming back, correct steering quickly again to gain back
proper line. Then add smooth throttle to help move the car in a
forward direction. |
| Cause: |
3.
Violently spinning rear wheels (rear wheel drive car). |
| Correction: |
3a.
Ease off throttle to stop rear wheels from spinning and
quickly add steering in the direction the rear end is sliding.
When rear end starts coming back, quickly add steering again
to gain back proper line. Then smoothly squeeze on throttle
to keep the car moving in a forward direction. |
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D.
TRAILING BRAKE TECHNIQUE
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This
is a technique using the brakes as a handling device as well
as a
braking device.
As
you approach a turn, initiate your braking smoothly to transfer
the weight
forward, setting the chassis by compressing the shocks and springs,
thus
increasing the front tire patches. Efficient Braking is always done
in a straight
line just short of locking the wheels. However, instead of releasing
the brakes
as soon as you begin the corner, continue to use the brakes as you
turn in for
the turn. As your cornering force increases, your braking force
should decrease.
This technique keeps the outside front tire patch loaded allowing
for better
adhesion and therefore, allowing the car to better "point" into
the turn,
decreasing the tendency toundersteer. This technique used in conjunction
with
the proper "line" technique will make the car much more controllable
and safer in
a cornering situation.
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E.
EXPLANATION OF SOME GENERAL TERMS IN RACING
AND HIGH PERFORMANCE DRIVING
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Apex:
That point in a corner when the inside wheels are at the inside
edge of the turn.
This may be a long or a short distance.
a.
If apex is too early, the road will be used up too soon as you exit
the corner
and/or the throttle cannot be applied as soon as it might for better
exit speed
out of corner.
b.
If the apex is too late, all of the road will not be used and/or
maximum power
will not compensate for an excessively slow entry.
c.
The proper late apex is illustrated and discussed later.
Line
of Road Course:
Imaginary path of a car as It maneuvers around a track finding
the proper apexes
while using the entire width of the road to your best advantage
and maximum
speed.
Drifting:
Car has lost traction and is gaining speed while running out of
road.
Sliding:
Car has lost traction and is losing ground or running out of road.
Drafting:
Following another car very closely in the "bubble of air" which
that car creates.
This makes it possible for you to achieve a higher rate of speed
by lowering your
wind resistance, and also allows you to save on fuel. This maneuver
can be
referred to as "Slipstreaming."
Power
Slide:
Controlled slide with throttle, maintaining proper line through
corner (used mainly
on hairpins or slow turns).
Camber
of Road:
Positive Camber (a banked corner): Outside tires maintain
excellent traction.
In the event of loss of traction due to locked wheels or a spin,
the car will go
downhill.
Negative
Camber: The road is going away from you, thus causing loss of
traction.
This in turn, may cause a front or rear wheel slide.
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F.
ADVANCED STREET AND HIGHWAY DRIVING ROAD EMERGENCIES
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BLOW
OUTS:
Modern
tires are not as subject to complete loss of air as tires were some
years
ago. Still, under certain circumstances, tires can and do blow out.
This is the kind
of driving emergency for which it is impossible to be completely
prepared, since it
comes with shocking suddenness, and with no advance clue that it
is about to
happen. As in all other emergencies, what you do will depend on
the circumstances.
Some general principles apply, however:
1.
Don't get on the brakes. It will be difficult enough to steer with
one tire
completely flat. Hard braking will only complicate matters at this
point.
2.
Don't exert sudden hard Jerking movements on the wheel. This can
put you into
a spin.
3.
If the traffic conditions allow such, you should continue bearing
in the same
direction the blow-out pulls you. (Generally, the car will pull
towards the side of
the car on which the blow-out has occurred.) Alert other drivers
with turn signals,
and steer the car off the roadway at the first safe spot to do so.
4.
Don't try to stop as quickly as possible in order to save the tire.
It is already
ruined. Save your life, and maybe the lives of others.
BRAKE
FAILURE:
The sudden realization that your vehicle's brakes are not working
properly can be
a terrifying experience. This is particularly true when you discover
this condition
at the precise moment you most desperately need the brakes. We will
be
concerned here with types of brake failure, brake fade, and complete
loss of
braking.
BRAKE
FADE:
Brakes, when
overused and consequently overheated, will begin to lose their
braking efficiency. This situation will usually occur on a steep
downgrade or in a
high speed run requiring frequent hard braking applications. When
fade occurs,
you may find yourself gaining momentum, even though the brakes are
applied.
Your
first consideration should be to get in a lower gear. If there is
time, gently
increase engine speed before shifting down to more closely match
engine speed
to wheel speed. Apply the parking brake carefully. This engages
the rear wheel
brakes only, and since they usually run cooler than the front wheel
brakes, they
may still have some braking power left. Meanwhile, your front brakes
can be
cooling somewhat, provided that you resist the urge to use the brake
pedal.
Above
all, don't panic. Don't get so engrossed in finding a way to brake
the car
that you forget you are still able to (and may be required to) steer
away from
contact or hazards. When speed is reduced to a level safe enough
to do so,
get off the road. Allow the brakes to cool before attempting to
move the car
again.
BRAKE
LOSS:
This is one to
turn your hair white! A mechanical malfunction occurs without your
knowledge so that when you step on the brake pedal, nothing happens.
Here
again, the situation will dictate what you must do first. If you
are approaching
an obstruction, a pedestrian, another vehicle, or a busy intersection,
you will
have to make an almost instantaneous decision. It may be best to
concentrate
on your steering and the power of your engine to get out of the
situation and
over to a spot where you can try to stop the vehicle.
On
the other hand, it may be that you will be best advised to apply
the parking
brake as hard as possible, drop to the lowest gear available to
you and look for
the nearest escape route. You may even have to decide which of several
obstructions you wish to hit!
In
any event, once the car is stopped, do not even consider using it
further for
any distance until the brakes are repaired.
WHEEL
OFF THE ROAD:
On any roadway,
you may find yourself with your right wheels off the pavement
and on a soft or low shoulder. This seemingly harmless situation
has been the
immediate cause of countless automobile accidents.
Don't
jerk the car back onto the pavement! This all too frequent, nearly
instinctive
reaction is deadly. You stand an excellent chance of coming back
onto the hard
surface sideways and going into a spin or tipping the vehicle and
rolling over.
Don't
jam on the brakes! Instead, ease off the accelerator pedal. Keep
a firm grip
on the wheel and straddle the edge of the road as the car slows
down. When
your speed is reduced considerably, use the brakes lightly to further
control your
speed. Then, and only then, get back onto the road after checking
to be sure
traffic will permit you to do so.
STUCK
GAS PEDAL:
Suppose you are
traveling on a busy highway, and have accelerated to pass
another vehicle. You complete the pass and ease up on the gas pedal
as you
swing back into the proper lane. But the gas pedal does not return.
You are
picking up more and more speed, and your repeated kicks and stomps
on the
pedal have no apparent effect. What do you do?
Well,
obviously, you will apply your brakes, but equally important, do
turn off the
ignition and if possible, get into a lower gear. The drag of the
engine will aid in
slowing you down, and you can safely leave the road.
EMERGENCY
STOP IN TRAFFIC:
Good drivers,
such as we are, never follow too close in traffic. But all drivers,
unfortunately, are not so good as we. Let's assume you are driving
a comfortable
ten car lengths behind another automobile and 60 mph on a two-lane
highway.
Another car is following you at an uncomfortable two car lengths
distance. As
you start to move up and get away from the "bumper hugger" behind
you. a
third vehicle passes you both and pulls in ahead of you. Just as
he gets in ahead
of you and starts accelerating away from you, something happens
ahead of him
and his brake lights flash as he brakes hard, losing speed rapidly.
At
this time, hand signal and feather your brake pedal rapidly to warn
the car
behind you. Then, apply the brakes as hard as is practical. Remember,
however,
that if you decelerate too rapidly, the car behind you may plow
into you.
Choose
an escape route to the right, since at some point during the brief
seconds
in which the situation is developing, you may have to make a decision
to leave
the road. You will probably not want to trypassing to the left since
this will expose
you to a possible head-on collision, and it would probably be preferable
to bump
the back of the vehicle ahead of you. Here again, however, you must
consider the
car behind you since the prospect of being sandwiched in between
two vehicles is
not a particularly happy one. There is a risk of going off the,
right shoulder, too,
of course, but it may be the only alternative left to you.
If
you do leave the road, remember:
1. Get both right wheels off at the same time if possible.
2. Keep a firm grip on the steering wheel.
3. Once you have committed yourself to leaving the road, use the
brakes only if
you have to during the high speed portion of the maneuver. Remember,
sliding
front wheels will not steer.
4. When your speed has been reduced, use brakes to complete bringing
your car
under control, and return to the road when it is safe to do so.
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G.
TECHNIQUES
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UPSHIFTING:
Most drivers forget that they'll only go thru the gears once in
a race. This
happens at the start when everything seems to be at the maximum.
From then
on it's playing up and down with the intermediate gears. However,
a few general
comments are necessary to help you achieve the best acceleration.
If
you take it to the red line each time, you are probably not getting
the maximum
acceleration from the gear train. Probably, the only thing you have
accomplished
is to develop maximum horsepower in each gear. However, you have
forgotten
about torque or pulling power, which is usually achieved below maximum
power
and maximum revs. A good rule of thumb is that maximum torque is
about 40% of
the maximum speed. Furthermore, once maximum torque is achieved,
horsepower
increases less rapidly.
While
acceleration is dependent upon torque, weight, adhesion and gearing,
for
simplicity just watch your tach. For maximum speed thru the gears,
shift at the
torque peak, spool, the engine up to peak power, shifting to the
next upper gear.
The critical factor is the speed with-in the gear shift itself.
For maximum
acceleration you don't want the revs to drop below the torque peak.
If
you reach peak power while the car is still accelerating, you need
a higher gear.
On the contrary. If you can't get the engine up to peak power in
high, you've run
out of power and need a lower gear. The worse condition is for underpowered
cars
where you are still accelerating AND climbing toward peak power
and you run out
of road. The only solution is more torque or a longer course!
For
the exact figures of peak torque and horsepower, check your owners
manual
or the tech specs with the sales literature. In addition, a comparison
of the torque/
power curve itself is usually very helpful.
DOWNSHIFTING:
The most popular method with a synchro-mesh transmission is to blip
the gas,
depress the clutch, and move the shift to a lower gear.
The
second method is called DOUBLE CLUTCHING. In this method the clutch
is
depressed, the gear moved to neutral, the foot removed from the
clutch while
simultaneously using the accelerator. The clutch is then depressed
again and the
gear lever moved to the desired gear. This method is used with old-fashioned
gearboxes, or when the gears are difficult to change. Since there
is less chance
of inducing wheelspin, and the transmission and gearbox suffer less
strain, if your
gearbox is acting-up, try this method to save the box and yet continue
the session.
The
main purpose of downshifting is to effect engine braking as well
as selecting
the proper gear for exiting a corner. However, it is important to
know what revs
to change at for
the maximum benefit. Here is a simple example: Engine has a
max/safe rev limit-5000 rpm.
Gearbox
ratios:
FOURTH GEAR -1.0:1
THIRD GEAR-1.2:1
SECOND GEAR-1.5:1
FIRST GEAR-2.1:1
The
drop in revs are easy to spot when upshifting with a tach, but can
also be
predicted. In our example, assume you are at 5000 rpm in third and
then shift to
fourth, the tach will drop to 4170 rpm. Likewise, the tach will
swing from 5000 rpm
to 4000 rpm when shifting from second to third, etc.
This
can be mathematically shown by multiplying the max revs by the ratio
of the
gears: 5000 x 1.0/1.2 = 4170 rpm; 5000 x 1.2/1.5
= 4000 rpm. This is most
important when down-shifting to avoid damage to the engine. If you
are at
5000 rpm in third gear and downshift to second gear, the tach will
scream up to
6250 rpm - over the safe limit. Therefore, to be sure that you do
not overrev in
a downshift, the engine must be down to 4000 rpm In third gear before
attempting
a downshift. In this example, second gear would be engaged at 5000
rpm or max
revs. and allowed to drop substantially during the braking phase
prior to reaching
the corner. This knowledge and successful application provides engine
braking as
well as positioning you in the proper gear for powering out of the
corner and
upshifting. Naturally some corners will require two or more downshifts
before
entering.
CORNERING:
This is the essence
of driving a sports car and can be broken down into various
elements. These are BRAKING, POWER-ON, THE CORNER, OUT THE CORNER.
The
most important factor is to brake, downshift and accelerate BEFORE
the corner.
Don't
take the corner in neutral or just coast thru it. For proper control,
power
must be maintained thru the corner.
We
will show the simplest methods of cornering. Master these concepts
and move
to the examples where two corners are completely dissected. Finally,
each corner
at Waterford Hills is analyzed in detail.
Remember
how you manage the forthcoming corner will set you up for the next
corner in a positive or negative manner. Smoothness and consistency
are the
important factors.
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POSITION
OF THE HANDS ON THE STEERING WHEEL
DURING THE ACT OF TAKING A 90° CORNER TO THE FRONT
Graphics
(coming soon)
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| Flag
Meanings |
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