New Free On-line
"Every Racer's Guide to
Recommended for every one
interested in handling, especially for racing and high performance
Dale Thompson, December 2015,
Here's How to Set Up Your Car for Good
Race or Road..........
- Rebuild/check your suspension for
stiffness and suspension binding. Of course you will replace
any worn parts. But there is less known about the affect on
handling of stiction and friction in suspension bushings and joints,
and twist and bending in the chassis and suspension components.
- Work out the suspension geometry that will
give the improvements in handling that you want and especially what
adjustments you have.
- Calculate a good baseline set up for "ride
stiffness" (springs) and "roll stiffness" (springs and anti-roll
bars". The proportion of front vs rear roll stiffness is the
main determinant of the balance of the car for understeer/oversteer.
We can help with Handling and Suspension Set
Up for your car - Racing, Self Constructed, Race/Road Performance, or
your Classic/Collectable car .......
In the late 90's, after 20 years in racing, we
began our search for ideas, and started our systems based suspension set
ups in the workshop, followed by track testing to check our work.
We have advised on all types of cars in circuit racing, rally, tarmac
rally, super sprint, drift, performance road cars, classic and sports
Using our Weight Transfer Worksheet (WTW) we can do the
necessary calculations to determine
a balanced set up, and then find a direction for
set up changes to try in testing. It is a very much a practical
exercise - do the baseline set up in the workshop, then test.
Analyse - Workshop Set UP - Test
When you're flat out building/preparing/racing your car, it is
difficult to source all the information you need to understand the
suspension set up on your
There are two ways we can work with you. We
can consult with you via email/phone, assisting you or your
technical people to do the work, or we can do it in our workshop at
Batemans Bay. Much of what we do is simplified so you can use
the ideas straight away. Some is unique to us, and some has become
common practice in professional racing.
Based on our experience setting up 100's of race
cars, we can get your project moving in the right direction. This
alone will save you time and money. You will have a better set up
and a faster race car. It is far better to start with a known
balanced set up for springs anti-roll bars and shocks, rather than
wasting track time/use up the car, testing and racing on unknown
spring/anti-roll bar/shock rates. Professional race teams do weight transfer
calculations like the WTW, and keep a running comparison of their "magic
number", as they progress through testing and racing.
What's Your Category?
Circuit Racing/Tarmac Rally/Hill
Climb/Historic/Drift/Club Car- Supersprint, Regularity, Track Day etc
Are You Building a Special, Show Car or
High Performance Road Car?
SuperCar Development Series Sports Cars Historic racing Formula
Whatever you race,
whatever performance car you build....
You need to know your
Every racing car has a magic
number. In fact, everything on four wheels has a magic number.
The magic number represents the set up where the car is balanced mid
corner - where the driver reports the handling is to his liking - no
excess of oversteer or understeer.
the magic number in an
Excel spreadsheet we have developed and used successfully for
all different types of cars - the
Worksheet (WTW). The WTW is the most accessible, easy to
understand set up information/tool available on the internet, or
in books, to allow you to quickly develop your car,
This Holden Monaro, for example, is
set up on the magic number from the Factory.
The WTW represents the simple
roll stiffness model of weight transfer, as explained in our
presentation "How Does the Driver Control the Car?" It recognizes
the major tuning adjustments we use in suspension set up, eg roll centre
height, spring stiffness and anti-roll bar stiffness. We have concentrated on ease of use and practicality.
Anybody can use it. Racing and road performance car workshops, or owner/driver
preparing your own car, all will find it useful.
As an example of the way the magic
number works, say you have a rear wheel drive sedan with 55% static
front weight, such as our Holden Monaro example. This might infer a
magic number of 60. So we adjust the various inputs in the WTW to
reflect this magic number, and change the set up on the car accordingly. This is
your baseline set up.
If it's a road car, you'll find it
handles nicely on the road. For race cars, each time you go racing or
testing, when you make changes to the set up, you
re-calculate the magic number. It
gives you a direction with your set ups - a higher number
is more understeer than the baseline set up, a lower
number is less understeer.
You can spec the set up of your car by
using our Weight Transfer Worksheet. Decide never again to fit unknown spring
stiffness, anti-roll bar or shock stiffness to your car. You can be in control.
We provide email support for subscribers.
Let us do the suspension set up on your car at our
Batemans Bay workshop. This program is the key to developing your
race car, special, project, or show car.
We'll do a workshop set up, and then track test with you.
With our procedures, all customers have improved
better than 1/2 second to in excess of 2 seconds per laps. Some
have won races for the first time.
Origins of the
Weight Transfer Worksheet. Why would you want to do any
calculations? Why aren't these calculations in more common usage?
bit of history on weight transfer and vehicle dynamics.
Complete explanation of the calculations used
in the WTW is here.
What You Will Know (about the
car) if You Do a Weight Transfer Worksheet.
Ten Biggest Set Up Mistakes
Thought starters about set up issues.