Some of you people (me
included) may not be too
familiar with what different
settings do to affect
your car while racing
down the 400m drag strip.
Suspension settings? What do they do? Is suspension
where you hold your breath waiting for the lights
to go green? Do you adjust it by holding heaps
of air in your lungs and slowly exhale some out
in increments? Do damper settings put a damper
on things? What does the angle of my toe/toes
have to do with drag racing? Should i point them
downwards to indicate i'd like a low 400m time?
Isn't LSD a drug? What about spring rate - if
its Winter/Summer/Autumn does that mean you can't
drag race? As you can see, its very easy to get
confused about the different settings available
to make your car go simply in a straight line
for only 400 meters. Almost worth getting out
and walking, should be easier.
This basically means you are probably not getting
the most out of the car, resulting in times which
could be a lot faster!
Regular contributor,
Andy R, has made up a small guide of what settings
you should use for each drivetrain type to gain
the most time at the track. Although exact settings
aren't mentioned much (due to the many makes and
models of cars with different drivetrain's - and
because its actually a top secret government conspiracy)
he does explain it in a way which makes it easy
to figure out what settings should be set to where.
So I hope this guide helps you as much as it has
helped me reduce my E.T.'s! Now the phone
home bills i kept getting that were to outer
space have reduced dramatically...
TUNING YOUR
CAR FOR THE 1/4 MILE
A SMALL GUIDE
By Andy R (which means
no funny stuff - i don't want to ruin his handiwork,
sorry to disappoint my fans. Oh, you're glad there's
no funny stuff? Dude/dudette/dudealien, you take
life too seriously!)
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FRONT
ENGINE, REAR WHEEL DRIVE |
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The main aim with
this drive type is to transfer as much vehicle
weight over the rear drive wheels to enable maximum
grip for takeoff. This requires the rear suspension
to drop (and stay down), the front to rise (and
stay up) and the differential to be set to allow
for the best grip settings. Generally, the settings
are:
- Front springs:
Soft as possible, it allows the front end to bounce
upwards under acceleration.
- Rear springs: Medium to 3/4 hardness as too
soft or too hard will make it wheelspin.
- Ride height: Front right up, back at standard
factory height. Don't lower all the way.
- Damper front: Bound 10, rebound 1.
- Damper rear: Bound 1, rebound 10. Front will
rise fast, and come down slowly. The opposite
happens at the rear, it drops fast and stays down.
LSD Settings
- Variable, generally the harder the
initial setting, the more grip the car will get
but it will be hard to get off the line consistently
(may bog down, may wheelspin). Softer settings
result in a more consistent launch. The Acceleration
must always be set to full to give equal drive
between both drive wheels.
Example
- Ford Mustang GT - Gained 0.870 seconds.
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FRONT
ENGINE, FRONT WHEEL DRIVE |
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This
drive type is the hardest to drag race with, as
the inertial forces of acceleration transfers
the weight to the rear of the car, and off the
drive wheels. This problem is generally compounded
by the fact that most front wheel drive cars have
hi-rpm powerbands that tend to make acceleration
hard - the harder you rev the car, the more top
end power made, less weight over the wheels and
more wheelspin. So in this instance, weight must
be kept towards the front. In some cases its
good to not to do all the weight reductions for
the car, as this will hinder traction, so experiment
to get the right combo.
- Front springs:
Medium/hard.
- Rear springs: Very hard.
- Ride height: Front down slightly from stock,
rear all the way up.
- Damper front: Bound 1, rebound 10.
- Damper rear: Bound 10, rebound 1.
LSD Settings
- Both Initial and Acceleration full.
For best results start in 2nd or 3rd and use high
revs/ low throttle to get the car off the line.
This "pulls" the car off the line cleanly
using the inertia of the engine and then gently
apply throttle while listening for wheelspin,
you will have to "pedal" the throttle
to get maximum acceleration. If you want more
pull off the line like this, change back to a
heavier flywheel.
Example
- Honda Civic VTi: Gained 0.954 seconds.
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FOUR
WHEEL DRIVE |
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This
drive type provides the most grip of all, but
in most cases it will require large amounts of
low/midrange torque (or very narrow gearing) to
run fast times. This is because the extra grip
tends to be more than most engines can deal
with, and as such balancing the gearing to suit
can be frustrating - too long and it "bogs
down" either off the line or between gears,
too short and it will accelerate hard but run
out of revs before the line. With this type of
car, the suspension is the deciding factor, as
longer gearing needs more "slip" to
allow for a fast take off. Keep the factory shocks
and springs as they are, and dial the LSD initials
to help "slip" or hook up. Less initial
give slip, more initial provides grip.
You will need to
set the front/rear torque bias to 40/60, as this
helps best for takeoff. Also, raise the rear ride
height as much as possible, and have the front
slightly lower than normal. Another trick to play
with is when you want to really fine-tune the
amount of slip for takeoff you can start to move
cambers in and out to effectively change the size
of the tyre's footprint. The more camber dialed
in, the less tyre on the ground, so more slip.
Example
- Nissan Skyline GT-R: Gained 0.467 seconds.
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MID
ENGINE, REAR WHEEL DRIVE & REAR ENGINE,
REAR WHEEL DRIVE |
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These setups are
excellent for drag racing as the heaviest part
of the car is positioned right near, or above
the drive wheels. This setup uses the same settings
as for the Front engine, Rear wheel drive cars,
as all the weight transfer principles are the
same. As a general rule the gains with this type
of car will not be as large as those for a FR
car, as the MR and RR cars have excellent traction
to begin with.
Example 1
- Vauxhall VX220: Gained 0.258 seconds.
Example 2
- Toyota MR2 GT-S: Gained 0.333 seconds.
BWAHAHAHAHAHAAHAAAAAAAAAAAAAAAAAAAAAAAAAA!!!!!!!!!!!!!!!!!!!!!!!1!1111!!eleven
Did you see the funny thing i added to each section?
No? Hehe, that's because i didn't add anything.
TRICKED YOU!! Oh, wait - i'm sorry. :( I didn't
mean to trick you! :( Here, have this lollypop.
:) I just found it on the ground over there. :)
Ten second rule! (although it's been there a couple
days now)
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