Q&A

I am going to organize a track day here in The Netherlands for the first time.
Biggest challenge are the sound restrictions: 89 dB measured Dynamic 30 meters (100 foot) from the track.
Anybody knows how much our stock Porsche's produce ?
997, 996, 964, 993 and all variations in Cup, GT3 and Turbo. The more data you guys could share, the better

Thanks a lot in advance

.

runet

You should be fine, assuming that the measurement from 30 meters is mainly in a free field. 110dB will be appr. 80dB 30 meters away according to theory.

You can use this calculator here:
http://www.sengpielaudio.com/calculator-distance.htm

My mk1 GT3 with a sports exhaust is about 102dB at 4500 rpm, measured from 1m.

flowbe

At zolder Racetrack is a stock 997 GT3 above the 95db limit . My 996 is ni problem at zolder .

Dervish

Good luck with this as it's a minefield. Manufacturers claims are never what is actually measured in the real world. In the UK the measurement is taken at 3/4 max rpm at a distance of 50cm from exhaust, that's a static test before you're even allowed a drive by.
My bastardised Miltek measured 105dB, a 996MKII with full Cargraphic measured 109dB but with dB killer installed measured 102dB.

The problem is age and useage. I've witnessed quite a difference between stock system levels dependant on age and general use.

Q&A

Thanks