I believe that F1 facility has a much lower sound level allowed then most tracks. I’m sure others on here can back that up and can offer you a solution to run under the sound level.

John,

I had no issues (was way under the sound limit) last year with stock moto. Only difference to your set-up is that I used a 14″ silencer and the blue two hole freeline airbox.

Two thoughts:

1. Your silencer packing may be gone, try to repack the silencer. If that does not help try a 14″ silencer (maybe with downturn end pipe), RLV sells a special quiet silencer if I remember correctly

2. Try the freeline airbox. It should be better than the 4-hole RLV anyway (the freeline is the airbox of choice for stock moto).

Good luck.

I believe SKUSA mandates a 2 hole box, so you might have had in issue if you showed up to a SKUSA race that required the box. I would agree with checking the packing in your silencer as well, unless it’s fairly new.

You’re correct John. SKUSAs rule is for a filter but if a track is in a noise concious area they have the discretion to mandate a box. Goof luck.

It’s been a while since I had to run an airbox….  From my recollection, there were no 4 hole boxes that were CIK homologated, either 3 holes of 23mm, or 2 holes of 29mm.

In the first post it sounded like Mr Davies gave you an option of plugging one of the holes?  Maybe you should have duct taped one of the holes shut to see if that made the difference?

CR

Hi John, I also ran last year at F1 with a mod moto and Dave told me no way I would pass the sound test . I had a 2 hole RLV box with a filter and a 14″ M4 silencer and it passed no problem. Note it was a new silencer, so the packing was fresh.

This is more of a Boston F1 problem than anywhere else. I don’t know of one other track that is more strict on engine noise then this place. Only engine that doesn’t have a sound issue on that track is rotax.

If only we could pick that track up and relocated it somewhere else…

Oakland Valley, believe it or not was really bad at one point with the previous people that operated it, and that’s way up state!!!!

I ran bikes at Bridge Hampton, that’s the worse I ever saw…  They had sound checks at tech, 50% red line with a sound meter, sound police around the track and you would get black flagged if you were too loud, fined even!!!!  We used all kinds of spray cans and elbows on the stingers to get them quiet…  On the grid, you heard “sound cops turn 10” so you knew where to roll off the throttle….

It’s one of those things, if you don’t play by the noise rules, you might loose the track…

Good Luck….