||All Honda/Acura, Integra Engine/Power
||January 16, 2002 01:25
||June 06, 2002 12:27
Page 1 - Test Conditions & Modifications
|Last Updated: 07/29/96
by Shawn Church
Thanks to Chris, Jeff and Tony of Pro-Dyno for their assistance.
The first two dyno sessions were performed in the winter months
with dry cool air. Testing conditions were in the high 70s, low 80s.
The latest test session was performed with air nearing 90 ambient in a
swamp cooled warehouse structure (meaning high humidity). Engine
operating temp was probably higher as well and fans may have been in
operation more often on the latest test. Winter tests were also
performed on reformulated gasoline which may have impacted results.
Conventional wisdom says that reformulated gas contains less energy, but
may burn more efficiently. Despite SAE correction factors, it is
difficult to compare runs separated by such a large time period and
divergent weather conditions (this assertion is supported by both
Pro-Dyno and the documentation from Dynojet).
Condition of Car
The first test was performed with the car in need of a valve
adjustment. The second session was performed almost immediately after a
valve adjustment. This could certainly account for some differential in
power. Regardless, the tests show that headers probably do not provide
a significant boost without a freer flowing exhaust system. The third
session was performed after an air conditioning compressor replacement,
6000 miles since the last valve adjustment, with a malfunctioning O2
sensor. The O2 sensor should not affect WOT readings, but the car will
be retested to verify.
The first test was performed with the DC ceramic headers and an
open element conical K&N on a DC bracket and pipe (connected to stock
intake tubing). The second test was performed with the stock headers
after the DC unit developed a crack. The air filter remained in place,
but the timing was bumped significantly over the 15 BTDC run on the
first test (this combined with the valve adjustment allowed the stock
header test to produce more power than the test with headers). The
third test used the rewelded/recoated DC headers, a Dynomax custom cat
back with 2.5" piping and a resonator, and a K&N filter supported by the
bottom half of the stock airbox after the mounting point for the DC
bracket broke. This change in the air filter configuration (in addition
to being somewhat dirtier after a previous ram air experiment) is
predicted to have affected intake efficiency somewhat. Timing was also
reset to just under 18 BTDC to compensate for the hot summer weather
here in Arizona (avgerage daytime temp in the 110F range).
Copyright 2002, Temple of VTEC