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Restrictions◦ 4 cycle◦ Less than 610cc◦ Runs on gas or ethenol
4 cycles Intake Compression Power Exhaust
http://www.youtube.com/user/uconnfsae#p/u/8/3qNWkOF6w0M
2001-2003 Suzuki GSXR 600◦ Powerful◦ Light◦ Cheap
Aftermarket ECU(Engine Control Unit) Custom tuned intake with 20mm restrictor Matching custom tuned exhaust Tuning ECU to match intake and exaust Custom cooling system Custom oiling system Other power modifications
Full engine control◦ Fuel and spark mapping
Traction control Launch control Data logging Wideband O2 compatible Great support
Restrictions◦ 20mm restrictor◦ No drive by wire
3 Parts◦ Runners◦ Plenum◦ Throttle body runner
Intake will be resonance tuned with Helmholtz equation Air is considered to act as a spring mass system With proper runner lengths and Plenum size the Volumetric
efficiency will go past 100%
Runner
Plenum
Throttle body runner
Adjustable Cam◦ tune to lower r.p.m. for max power
Remove 1st,5th,6th gears Be super awesome! Smaller head gasket for higher
compression.
Exhaust is dominated by:◦ Gas Particle Movement◦ Pressure Wave Activity
Pressure Waves bouncing off walls of exhaust piping creating back pressure
Reduce backpressure by reducing sharp angles in piping and tuning exhaust system
Exhaust goes from each port to single collector
Easier to manufacture Gives additional
horsepower throughout power curve
Exhaust goes from each port and is paired with corresponding cylinder into a collector and then joins other pipe with last cylinder
Primary and secondary lengths
Slightly more difficult to manufacture
Additional torque
Steel-cheap, rusts easily, must be treated with a ceramic coating to increase reflectivity so that exhaust can flow more easily
Stainless- more expensive, corrosion resistant, highly reflective; therefore, does not need to be coated
Titanium-original exhaust for the bike is titanium, one team in the past has used this stock to reduce weight, however they replaced it the following year with a custom exhaust
4-2-1 exhaust will be the preferred design Two exhausts will be fabricated due to lack of
frame to design exhaust around First exhaust will be essentially straight pipes
so it can be more easily tuned on the dyno Once frame and engine mounts are completed,
final exhaust can be planned and fabricated Primary and Secondary lengths will be based off
of the respective lengths of the first exhaust Must comply to FSAE rules and regulations:
◦ outlet no more than 60cm from rear axle centerline◦ no more than 60 cm off the ground◦ exhaust system needs heat shielding
No Mandrel-Bender= cut 180° piping to desired angle
Piping will be attached by tight slip fit joints and springs holding joints together for initial tuning
Test headers willonly be welded where necessary
Adapters will need to be made so that headers can cover exhaust port
Will using existing bolt patterns each adapter will be separate to avoid thermal expansion and warping when engine gets hot
Primary and Secondary lengths will be based off of calculations, and will be more accurately tuned on dyno
“Tuning” will be shortening dyno’s primary and secondary lengths until desired engine performance has been found
Maximum sound level cannot exceed 110 dB
It is not cost efficient to fabricate one from scratch- many aftermarketmufflers exist
Qty:
Cost:
Header Fabrication:
Pipe (Steel) 85
Pipe (Stainless Steel) 250
Adapters 0
Collectors 0
Spring Joints 0
Muffler: 500
Total 835
DYNO Tuning
AKA DYNO Flogging
Keeps the engine safe Gets you max power Max fuel economy Max driveability
Dyno (sometimes called a brake): A device that can absorb power at a set rate
Rich: Too much fuel going into the engine Lean: Too little fuel into the engine Torque: The turning force the motor
creates Power: the force the engine exerts times
its velocity (the engines ability to do work) AFR: Air Fuel Ratio EGT: Exhaust gas temperature
Wideband: A device used for measuring AFRs
Load: How hard the engine is working (directly related to throttle position
Bare minimum Dyno Wideband O2 sensor Space Torque Gauge on brake
Good to have EGT probes Computer logging
Prevents dangerous lean conditions and detonation
What is bad about lean condition? Causes very hot cylinder temps Comes with detonation
What is detonation? When fuel ignites before you want it to Caused by too little fuel or too much
timing advance Can break things very quickly
1) Choose a load to run the engine at (start with none)
2) Start at a low speed where you:1) Analyze the AFR and correct as needed2) *apply more (or less) torque from the
dyno manually as the parameter changed
3) Record the results for future reference4) Loop steps 1-3 for different combinations
of load and speed5) Go back to where you started and
compare the current results to the results at the start of the tuning session
Power is what gets you a change in speed Having a dyno lets you make a change
to the engine and actually see if it did any good
You need enough fuel to take advantage of that air, too little and you are lean, to much and you are rich
For each loading and speed of the engine a different amount of fuel may be required for a given amount of air to get max power
This is why tuning can be a very time consuming process
Running rich means you are using more fuel than you need to
Removing the rich conditions not only saves you fuel but gets you power
Dyno tuning allows us to tune the engine for max power, it also is how we decide where that power will be
As of now I have a space partly worked out This is mainly a concern of safety,
consider: High noise of the engine Exhaust gases Worst case: Flying engine parts http://www.youtube.com/watch?
v=JSc85rsOEec
Right now the system is open loop This means that we waste lots of water
(100s of gallons per day is possible) We have most of the major components to
make it closed loop The ancillary bits are what make going
closed loop a pain in the ass Some basic protection equipment
¾ plywood EAR PROTECTION!! Big ass fan to evacuate exhaust and
cool engine