Final Design Presentation

Final Design Presentation
Last Wednesday we arranged our second Design
Presentation this season, this time to present
Engine after Dyno, Impact Attenuator and Aerodynamics.
In addition to this, three exciting
projects were presented; the Dynamic Windtunnel
Model and Alternative Powertrain
Bachelor Thesis’, as well as our recently initiated
Active Suspension project. We were happy to see
that the auditorium was �illed and that the questions
and discussions were vibrant like never
before.
Manufacturing
Manufacturing is progressing well, and it is
encouraging for the team to be working on what
now starts to look like a car. With easter right
around the corner and two full weeks of workshop
time ahead of us, we are optimistic towards
our deadline of having a running car in the end of
April - though as with anything in Formula
Student, it will not be easy and will require a lot of
hard work from the entire team.
Driver Selection
What is a big question every year, for every team,
has now also been asked here at Chalmers: Who
will drive the car? Per the rules we will need four
drivers, all students from Chalmers. As we estimate
that 60-70% of the performance is driverdependant,
it is important to pick someone who is
both fast, and who has the right mindset and will
stay calm even in a high-pressure situation. A few
weeks ago we had an initial round of carting
where everyone participated, and last week the
top drivers from that event went out for a test
drive with the CFS11. We are glad to see that we
have several strong and dedicated candidates -
some have been working out for months with the
competition in mind already.
Newsletter March
Days until Rolling Car
21
Days until �irst competition
100
Sven Rehnberg and Dean Todevski manufacturing the plenum in
Carbon Fibre at our main Partner Volvo Cars.
The sun rises over the driver selection event at Stora Holm.
2012
www.chalmers.se/formulastudent

Last day of Dyno testing
With three weeks left to the running car deadline
and 100 days to the �irst competition the dyno crew,
consisting of Sebastion Krause, Blago Minovski,
Tony Persson and Andreas Widroth, completed the
tuning and mapping of the CFS12 Yamaha Fazer
600 cc engine.
Last autumn, the design goal of performance was
set to maximizing the mean torque in the rpmrange
where the majority of the driving time during
a competition is spent. This range is approximately
5 000-10 000 rpm according to logged data from
testing of the CFS11 car. This approach was taken to
get as much drivability and useful power out of the
engine as possible, even if it meant losing some hp
in peak power at 12 000 rpm.
With the goal of delivering a reliable and weight
optimized engine system with suf�icient power and
possibility for low fuel consumption in the back of
our heads, the crew began installation of the engine
and the associated system in one of the engine cells
at the division of combustion at Chalmers. With
constantly new challenges and a lot of practice in
problem solving for engines and electronics, testing
of last year’s intake and exhaust system begun. We
can attest that this made us take a leap towards the
CFS project goal of delivering the Engineers of
Tomorrow! These early tests with the CFS11
systems were great for calibration and reference,
but also an instructive way to learn how to operate
the dyno.
The mapping of the engine was performed by the
following procedure:
• Setting the injected fuel/air-ratio by the volumetric
ef�iciency and lambda tables for all combinations
of rpm and loads, to match the installed intake
and exhaust system.
• Mapping the ignition timing for maximum brake
torque in every load case.
• Adjusting the lambda table for the best combination
of power and fuel consumption.
Newsletter March
The comparison between the �inal dyno results and
the simulations run in GT-Power during the design
phase, showed better conformance than we could
ever have expected. The rpm for which we got
peaks in power and torque matched almost
perfectly. In comparison to CFS11, our engine
system has a 3 % higher mean torque in the rpmrange
it was designed for, as well as higher power
all the way from 5 500 to 11 500 rpm.
Despite the limited time and the need for a quick
rebuild of an engine, the CFS12 engine group managed
to perform all necessary tests and are very
satis�ied with the results that will help us reach our
goals. However, the �inal tuning of the settings will
be done on the track and/or in a rolling dyno with
the possibility of transient rpm sweeps.
Tony Persson
Engine
2012
The Engine installed in one of the the engine cells at Chalmers
www.chalmers.se/formulastudent

Manager’s Corner:
This is Engineering
I had the pleasure this month to introduce Design
Presentation #2, which gave the members of
CFS12 and CFS13 the opportunity to demonstrate
initial results of current and future projects.
These presentations gave me the con�idence that
the future of CFS is bright, and I look forward to
following their development together with you
over the coming years. For 2012, the running car
deadline is fast approaching and it is excellent to
see a constant throughput of parts from the work-
Motorsport- Motorsport-
sensors
VIP
Gold
Produktion & Modell AB
Silver
Bronze
Newsletter March
shop. We all are looking forward to
the completion of the car so that an
extensive testing phase can be undertaken, the
“Operate” phase of the CDIO concept which the
project is built around, and this is the time when
we �ind out if what we designed & simulated is the
same in reality. It should be kept in mind that CFS
is �irst and foremost an educational project and
that an excellent �inal competition result is as a
result of the excellent education we provide. We
don’t just “build cool stuff” at Chalmers Formula
Student – we Deliver the Engineers of Tomorrow!
Jonathan Rice
tandemhopp.se
We are always open to new partners who wish to help us
in our goal of Delivering the Engineers of Tomorrow.
Contact us at formulastudent@lists.chalmers.se
2012
Department of Automotive Engineering
www.chalmers.se/formulastudent