Exhaust sound level for stock gen 2?

[zs]

does anyone have dB figures for idle & 3/4max rpm please? never had a meter when i had the stock kit on and curious to see if it's possible to meet a 100db @ 3/4max rpm limit at a 6.1mile Dorset circuit!:

http://www.mazdaontrack.co.uk/view-the-circuit-47-...

thanks

[viper paul]

I only have one from memory and one from Goodwood in the SRT

GTS with stock made 101 db

SRT made a just in 103 db

[zs]

Thanks Paul
Thought it'd be borderline! On further investigation the noise limit for this event isn't going to be (remotely) strictly enforced . . ! . !! . well not for vipers with any of the array of 'normal' exhaust modifications that i've witnessed e.g Borla, Roe, RT, etc anyway... although i think Ginj you find it hard to away with your set-up (likewise me with my current kit!...)

[Ginja]

Its true, mine may indeed make a small amount of noise, I use the noise limits as an excuse to not thrash my lovely car for the day, instead I can use the time polish it a bit more!

[zs]

Ginja said:

Its true, mine may indeed make a small amount of noise, I use the noise limits as an excuse to not thrash my lovely car for the day, instead I can use the time polish it a bit more!

noooooooooo!

[fishboy]

zs said:

Ginja said:

Its true, mine may indeed make a small amount of noise, I use the noise limits as an excuse to not thrash my lovely car for the day, instead I can use the time polish it a bit more!

noooooooooo!

[Dr-Bob]

Wonder if i can ever do a track day now..............

[neilsfishing]

Dr-Bob said:

Wonder if i can ever do a track day now..............

YES YES YES all them Horses must be let lose

[zs]

Dr-Bob said:

Wonder if i can ever do a track day now..............

http://www.pistonheads.com/gassing/topic.asp?h=0&f=76&t=680955&mid=35940&nmt=Top%20Speed%20Airfield%20run



not quite a track day though...

[F5000Racer]

When we were developing the ZB 27, the SAE noise passby levels were about 1 dBA under the limit in final development form. When the electronic noise cancellation exhaust system was canceled less than a year before 03 production started, we had plan B ready which relied on passive conventional attenuation and balanced the pulse waves between the left and right exhaust banks to get a nice snarl instead of the UPS truck exhaust note of the SR 27.

[Ginja]

My 97 GTS with straight pipes does sound a bit UPS truck like when idling (especially when cold) but roars like nothing else when opened up.

[zs]

Ginja said:

My 97 GTS with straight pipes does sound a bit UPS truck like when idling (especially when cold) but roars like nothing else when opened up.

Yurp...I like (hang on...'straight pipes' = no cats now?)

[zs]

F5000Racer said:

When we were developing the ZB 27, the SAE noise passby levels were about 1 dBA under the limit in final development form. When the electronic noise cancellation exhaust system was canceled less than a year before 03 production started, we had plan B ready which relied on passive conventional attenuation and balanced the pulse waves between the left and right exhaust banks to get a nice snarl instead of the UPS truck exhaust note of the SR 27.

An SRT voice from the motherland
what's the ZB 27? . . . =prototype number?