| During each run, the
engine speed was brought to 2000 rpm for fifteen seconds. This allows
the air to run throughout the system and allows the intake air temperature
to normalize and negate heat soak from the car sitting at idle. The
car was then taken from 2000rpm to 6800rpm at full throttle under
load over the next thirty seconds. The car was then allowed to idle
for one minute before the next run was started. Each lighter line
on the graph above represents each power run, and the darker line
represents the average over five runs.
The stock intercooler was tested on one day, the APR intercooler
was installed, and the testing repeated the next day. The conditions
were very similar on both days, however it was slightly hotter (3ºF)
on the day the APR intercooler was tested.
Most alarming about this entire test was the fact that during the
third run with the stock intercooler, the car began to pull boost
and timing in order to protect itself from the high intake temperatures.
The car also exhibited this protective behavior in both the fourth
and fifth runs as well.
The APR intercooler performed as we expected, keeping the intake
charge temps almost 40ºF lower by the end of the fifth run.
Given the fact that no dynamometer test cell can reproduce the airflow
that a car on the open road gets, we are confident that differences
between the APR intercooler and the stock one would be even more
apparent on the street or track.
During the testing on the dyno, a normal dyno power run was performed
with each intercooler, and the APR intercooler recovered upwards
of fifteen horsepower over the stock intercooler. The uncorrected,
wheel horsepower is displayed in the graph below. |