Section 5, 21
"No machine shall exceed a noise level of 95dBA measured at track side at start/finish line during any race or practice seesion. The Race Officicals will monitor the sound levels during each race or practice session. Any machine in violation of this rule will be immediately Black Flagged and must be able to demsontrate that the problem has been rectified before being allowed back on the track"
My question relates to, most bikes that I see out run full systems, some louder than others. And I've heard of various tricks, shortshifting, packing the can with some weird things, putting in a home-made baffles, wrapping the can up like a pig in a blanket, etc.
Now here are my questions.
Stock systems will always pass, that's a given (but they're heavy, and restrictive, the benefits of aftermarkets systems are obvious), so mine is rated at:
81.2 dBA at redline, 12 feet away
68.8 dBA at 4000 rpm in second gear at 12 feet away
94.7 dBA at 6500 rpm, 20 inches from the muffler, at a 45 degree angle
So dBA's will decrease the further away the exhaust is from the tester right?
So my dBA's will be even less than 81.2 from track - tower?
Some exhausts, like D&D's are going to fail regardless
Some exhausts after they've been on for a while and the packing is all unpacked, will also fail.
But say is a new / newly repacked exhaust and these are the values for it:
84.9 dbA, redline, 12 feet away
74.1 dBA at 4000 rpm second gear, 12 feet away
100.6 at 6500 RPM, 20 inches from muffler
Would this pass tech at mission?
Without having to do any of the "additional" modifications to it?
And how would u short shift down the straight?
Wouldn't u lose ground? I know u don't have to shift at redline cause most bikes reach peak power before redline, so you don't have to absolutely scream it, but still....
Right now I have a stock exhaust with three cans:
Yosh carbon - MINT in case I ever need to sell the bike
Stock - To pass Mission tech
D&D - Annoyingly loud but lotsa rash, good fun for US track days
But am looking into a full system... For obvious reasons. I know that I should focus on technique more than anything, but hey, they go for cheap used and since I can't ride the hoe, gotta at least play around with the hoe, you know!?