Track Day Silencers

[Craig Sams]

I'm hoping to do a Trackday at Croft with my AA3.5 Supercharged, it has an 88db noise limit, currently its coming out at 93db, any advice simple clip on silencers which would do the trick? 

[smokin]

At what rpm are you getting 93 Craig?

[Craig Sams]

6,000rpm

[smokin]

That's 1k more than I ever rev to when they test.

Don't know how variable the testers are but usually they either (a) ask me for 3/4 of red line and I give them 5k or (b) they ask me where the red line is and I fib and tell them 7k - they then ask for 5 or 5.5.

My AA2 puts out circa 92 at 5.5k and if it's close to the limit and they have drive by mics they point them out and suggest I lift a little as I pass ;-)

Never been refused or black flagged but then I avoid tracks with low limits.

If you have trouble with their testing ask for a 2m test at the side as a rear test can pick up engine noise as well as exhaust (see here) http://www.javelintrackdays.co.uk/trackday/index.php?option=com_content&view=article&id=5&Itemid=22

[Craig Sams]

Maybe I was too honest with the redline, I'll tell them its 4,000 rpm then 2/3rds puts it down to tick over. Ive sent a couple of enquiries to some specialist exhaust manufactures. 

[AtomMadStew]

Some say the wail of the supercharger causes more of a problem with noise than the exhaust.

[lemmy01]

http://www.ebay.de/itm/400215272196?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649