February 2014 |
Overdrive
| 45
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Untitled-4 1 7/25/13 10:43 AM
the engine effortlessly,
how is a larger turbo-
charger going to make
more
turbo boost?
In reality, you must
make the semi-truck
run "free" – with
better air and exhaust
flow – to gain addi-
tional fuel mileage,
performance
and
longevity from the
engine.
Start by changing
out the stock muffler
for a performance
muffler, which will al-
low the engine to gain
¼ mpg or more.
Also consider dual
exhaust: It will out-
perform a single
stack,
help air flow
through an engine
better and lower the
exhaust gas tem-
perature by about 50
degrees.
Next, look at the air
intake system. Two air
filters mounted out-
side of the hood are
much
better for air
flow than one air filter
under the hood.
Aerodynamic trucks
all have the air filter
under the hood, so we
have to work with it. I
recommend installing
the Fleet-Air Filter,
which is made of
three layers of foam
sprayed with oil over
an aluminum frame.
Bruce Mallinson is the
owner of Pittsburgh
Power, an engine
performance shop in
Saxonburg, Pa.
This filter is designed to
enhance air flow to the
turbocharger, and the
engine will gain another
¼ mpg as a result.
T his series will con-
tinue next month, when
I'll
write about exhaust
manifolds, fuel lines and
your engine's ECM and
how they can improve your
engine's turbo boost.
ProTips_0214.indd 45 1/28/14 11:15 PM
