| 21 Sep 06 Sound Testing |
A few notes about sound
volume:
The decibel scale increases ten fold for every 10 decibels measured.
A 10-dB increase is perceived as roughly doubling loudness.
A rich fuel mix will create a much louder exhaust note than a properly
tuned system. |
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| 19 Sep 06 Test Results,
Stock FFR pipes, measured at a 90 degree angle to pipe outlet at
10 feet away, aprox waist high. Car stopped, no load. |
Dynomax Race Bullets and Car
Chem Inserts, measured at a 90
degree angle to pipe outlet at 10 feet away, aprox waist high. Car
stopped, no load. |
|
RPM |
DECIBELS |
| 1000 |
100 C
scale |
| 2000 |
116
C scale |
| 3000 |
113
C scale |
| Note: Engine running
very rich. |
|
|
RPM |
DECIBELS |
| 1000 |
C scale |
| 2000 |
C scale |
| 3000 |
C scale |
| Note: Engine running
better, but not really tuned. |
|
| The results
of our very unscientific test indicate approximately
decibel sound reduction. The car will get quieter once it is tuned
properly. |
| A Radio
Shack $40 sound level meter was used for all tests. |
| You can
really hear the engine mechanical sounds now with these pipes. It
is noticeably quieter at idle and cruising, but still very loud
at WOT. The tone also changed to more of an open header roar. |
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