The Alpha Performance Audi B8 Boost Cooler System is a great
addition to your S4 whether your car is stock or modified. The system features
a large, high efficiency heat exchanger located at the front of the car, an
additional reservoir that holds over a gallon of coolant and a high flow pump
which runs complementary to the factory pump. Whether you live in a warm region
of the world, enjoy long spirited drives in the mountains or run long sessions
at your local track day, the S4 Boost Cooler will keep your intake temps low,
maintaining your 3.0 TFSI supercharged engines maximum output.
As with all Alpha Products, everything needed to install the
system is included – bolts, fittings, lines etc. Best of all, no drilling or
modifications to the car are required, it’s a 100% bolt in affair.
The most important part of an efficient heat
exchanger system is the core, skimping here could mean the overall performance
of an ‘upgraded’ system might be worse than stock! The OEM unit is a single
pass design with a core area of 156in^2. Our Alpha core is a high quality,
triple pass unit where the coolant makes three passes through the heat exchanger
vs competing cooling kits which use a single pass design. The core is made in
the UK with a fin area of 417in^2, almost three times the surface area of the
stock core! For added durability the fins are hemmed for strength, able to
withstand abuse from road debris.
Capacity, Decreased Heat Soak
The hand fabricated
Alpha coolant reservoir acts as a large heat sink to keep coolant temperatures
low and stable. With over a gallon more coolant on board, it increases the
cycle time of the coolant in your S4 allowing it to dissipate more heat before
being recirculated, working as a large thermal reservoir, keeping the
horsepower-killing heat soak at bay.
Pumping Up the Power!
To give you
the best possible performance and keep the coolant flowing efficiently through
the larger Alpha heat exchanger, we added an additional high flow brushless pump
to run in conjunction with the OEM brushless pump. The combination of the two
pumps allow a very high flow rate to keep the fluid moving and maintains that
flow rate at higher pressures giving you the assurance your car will stay cool
in hot climates, extended track sessions or everyday driving. See graph below
for pump data
The Devil is in the Details:
To provide your S4 with the best cooling system on the market we
thoroughly tested multiple variations of the Alpha Boost Cooler System. We
tested divorced and non-divorced systems finding that divorcing the system
showed no real gains, only added complexity. We found the stock pump stops
flowing at 8psi so we added an additional brushless pump to support running
higher pressure and maintain flow. Data log after data log was recorded and the
results analyzed until our engineers were completely satisfied.
All testing/logging was performed on our Dynojet dynamometer
doing 1st through 5th gear pulls with conditions and ambient air temps equal.
Post Intercooler Air Temperature:
This graph shows the difference between stock VS Alpha air
temperatures after the air has passed through the intercooler, cooler air means
Post Intercooler Coolant Temperature:
This graph shows the difference in coolant temperature between
the stock system and the Alpha Boost Cooler kit after the coolant has passed
through the intercooler to cool the air charge. Lower temps mean the car can
maintain maximum output!
Pre Intercooler Coolant Temperature:
This graph shows the ability of the Alpha system to pull more
heat out of the cooling system. Notice how the water temps stay more consistent
with the Alpha Cooler. If the heat rejection was the same between the stock and
Alpha system, the lines would trend the same.
Heat Rejection of Air:
This graph shows heat rejection of OEM versus Alpha Performance
system. Heat rejection is a perfect indicator of how the system performs because
the starting temperature does not affect the data. The Alpha system has
significantly greater heat rejection throughout the run and rejects more heat on
deceleration allowing for quicker cool down time.
High Quality triple pass heat
Hand fabricated reservoir
Brushless coolant pump
4 Ply Heavy Duty Silicone
Brushless Pump Controller
All hardware needed for
If you have any questions
about the Alpha Performance Boost Cooler Please give us a call