Odd but it definately happened, G-sensors have a natural resonant frequency, hit the right resonance at high enough amplitude and what the sensor sees becomes "constructive".

It's analogous to a singer breaking glass. The glass can be broken either by dropping it on the floor (impact) or by constructive (additive natural resonance).

 

How long you think I could run that before I got a ticket out here, huh? lol

 

I'm sorry...but I'm going to have to disagree here. The amplitude that would be required to simutlate an impact like that would be massive. Far beyond what a normal internal combustion motor can produce.

I know of tons of cars that are much louder than a twin turbo Z running off the dp's, and none of them have ever had an airbag go off due to the sound from the exhaust. There had to be another factor in that situation.

A glass dropped on the floor doesn't break due to deceleration. It breaks from the force of impact on a very small surface area on the glass. Futhermore, do you know what kind of dB levels are required to break glass???

 

I'm not going to argue , it did in fact occur , on the dyno, open TPs in a very "closed" space. The G-sensors are not perfect , they have finite mechanical structures (modern cars use MEMS ) which can respond to constructive resonance.

The rough glass analogy is simply put to show how an impact or constructive resonance can yield similar results. A microwave oven does not impart massive heat amplitude to the food being cooked , it constructively resonates the water molecules over an extended interval of time.

 

Based on my 15 years experience, living and driving in Los Angeles and Orange County...I am going to say.....47 seconds.

 

If you don't think it can or did happen, stand next to the airbag on the seat when you dyno your car with no testpipes on and have some of your friends tape it cuz we'd love to see what happens. The force of the airbag would probably knock you down or out, maybe both. Luckily the guy running the car barely got knicked on the arm and still would up with a lil bruise.

 

Maybe this could be a new episode for the Myth Busters .

 

http://www.physics.ucla.edu/demoweb/...ith_sound.html

Well I do now , about 140dB in close proximity

 

Who are these guys talking about resonate frequency and constrictively resonating water molecules???

But Sharif, I think your 47 second guess is probably about right!!

 

[QUOTE=Navygolf13]Who are these guys talking about resonate frequency and constrictively resonating water molecules???
QUOTE]


A bored geek I guess

 

It takes less than 1 watt of power to break glass w/ sound. Glass is too rigid to bend and allow transfer of sound... a G force sensor works in a different way, and it measures deceleration.. even if it could happen with the sound, the direction of the waves would never be perfectly horizontal to actually switch off the airbag.

However, theres is a possibility... airbags are set off w/ hydrogen azide, a highly combustible compound... the sound waves can very well cause it to combust and cause the airbag to deploy w/o the sensor actually tripping

 

no way... just a "story"

it wasn't the sound that triggered the airbag

 

Wow, this all has so much to do with the APS exhaust! Subscibing!

 

I will assume that the new exhaust will be louder than the APS 2.5 exhaust.

Cesar

 

Off topic south central!!! Start another thread!!!!!!!!!