This was an older thread but I finally got around to running some
crude sound level checks with my trusty Radio Shack sound level meter,
left over from my 'audiophile' days.
Here are the results:
1990 Toyota Camry LE V6 @ 65, windows up ~70db
1973 TR6 @ 45 4th/OD, top down side road, no traffic ~80db
@ 65 4th/OD, top down freeway, no traffic ~90db
@ 65 4th/OD, top down freeway, car traffic >90db
'Threshold of Pain' ~110db
Notes: Muffler by Walker (per PO)
Tonneau cover on passenger side,
Mike aimed forward on tonneau edge @ gear shift
'A' Weighting, to eliminate low frequency energy
Meter from Radio Shack, Cat. No. 33-2050
4.11 diff & OD: 45 mph=~1900 rpm & 65 mph=~2800 rpm Running
the Gears, shift @ 3000 rpm, adds < 5db
'~' means db readings fluctuate widely, i.e.. > +/- 3db
<> Is any one interested in the results if I extend and refine this
exercise?
I have a friend with a Monza exhaust and as soon as his 73 TR6 is on
the road I may try to get similar level readings.
<> Has any one attempted or know of references for similar checks with
other mufflers/conditions?
Murry Mercier
CF10027U 73 TR6
Getting ready for the 'River-Run' on 5/31
(a 240 mile 'fast' drive from Columbus to the Ohio River, cross on the
ferry @ Fly, OH...etc and back to Columbus)
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