Event#1 2/23/14 Sound report

[TedV]

sound readings for the louder cars on Sunday:

Group 1:
XP 6 - 96.6, 95.5, 95.8, under 90
XP 22- 92.5, 95.8, 97.1, 102.2
CP 15- under 90, 89.4, 97.2, under 90
CP115- 94.6, 95.2, 93.4, under 90

Group 2:
BSP 313- 95.9, 95.8, 96.7, 97.4
STM 4- 78.8, under 90, 91.2, 95.4
STM 137- 85.7, under 90, 97.4, 90.6
STM 142- 90.3, 92.8, 92.0, 94.4

Group 3:
PASP 13- 99.1, 94.2, 94.4, 96.7
PSTR 92- 95.7, 96.4, 95.1
PSTR 97- 92.2, 90.3, 97.5, 95.4
PSTR192- 94.0, 95.0, 94.9, 96.1


These are the recorded readings for all the runs on cars that received a warning about sound levels over 94.5 Dba. Over 97.5 received DNF for that run. There are a lot of variables that impact sound readings. On a different day, with a different course, throttle at different position, the readings may be different.

[integra55]

good work Ted …. dI know my car doesn't come close to breaking sound … but just for giggles do you have a record of what STS 55 did

thanks

[TedV]

ya know, I almost posted your numbers, knew I should have.

STS 55- 94.1, 93.5, 93.7, under 90

your car was juuuuuuuuuuust under the warning zone.

[steverife]

How about (P)STS 89/189?

[integra55]

ya know, I almost posted your numbers, knew I should have.

STS 55- 94.1, 93.5, 93.7, under 90

your car was juuuuuuuuuuust under the warning zone.

you're right about differing conditions … I've never been that high before, well not on sound anyway (no changes to the car) …. we'll have to see how it responses next time

and funny enough the "under 90" was my fastest run

thanks

[TedV]

How about (P)STS 89/189?

PSTS 89- 89.2, 89.3, under 90
PSTS 189- 89.8, 89.1, under 90

[dewittpayne]

Air density, which is a function of temperature, humidity and barometric pressure affect the value of the sound reading. As I remember, denser air equals louder. I know that sound control at Summit Point records temperature and maybe the other stuff as well. Whether they use that to correct the meter reading to some standard condition is a question to which I don't know the answer.

Speaking of accuracy, does the region have an SPL calibrator to check the meter before an event?

[jdpeterson21]

PAS 10 / 110?

[jcox07]

Ted post my car with both Mark and myself driving.

[TedV]

I will post more sound results this evening. Papers are at the house.

The meter has a built in calibration setting to adjust to a base line. I will admit there are better meters out there but at a significant increase in cost. As in cost more than some of the cars competing out there. Setting a meter up for a local autocross is harder than a road race. Throttle inputs change much more in a shorter distance and the best place to put a meter might be in the course.

We all could be driving electric cars and someone could complain about the tire squeal.

If someone would like to be chief of sound, please step forward. Its a great way to make new friends.

[dewittpayne]

I did sound for a session once at an event in Roanoke. Tire squeal was a lot louder than most of the engines and appeared to be well over the dB limit. But the microphone location was, to put it mildly, less than ideal.

[flier129]

Bouncing off my limiter is loud, lol.

[TedV]

So are lift throttle raspberries.

[TedV]

PAS 10- 87.9, 90, under 90, under 90
PAS 110- 85.3, 82, under 90, under 90
PESP 99- 90.9, under 90, under 90, under 90
PESP199- 89.7, 90.2, under 90, under 90

Anyone who thinks you can NOT quiet a V8 down, talk to JY. His Mustank popped over 100 when it first came out.

Thank ya JY

[MARKP]

He also knows how to make them louder. Didn't he run something like 120 at Adesa a couple of years ago?