Quick ways to drop DB's...

[MG#43]

Hey,

Anyone had to find a quick solution to dropping DB's for a track day? Just checked and the one I have booked for Thurs is actually 101db. My bike tested 102/103db the last two times, this was with the baffle in.

I've wrapped some wire wool round the lower part of the baffle, but didn't seem to make a difference, obviously without testing it I won't know for sure...

Any ideas welcome, thanks!

[lihp]

Smaller diameter exit on baffle or a longer baffle
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[garth]

Insulation around the baffle, a longer baffle, a different can, or a different face on the rev counter

[CarlosCBR]

Stuff some folded/crushed up coke cans down behind the baffle. Works a treat.
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[stinkwheel]

1) Take the end off the exhaust can.

2) Shove an empty coke can in there and screw it back on.

3) Burble over to scruitineering, do not rag it.

4) On the outlap, get off the racing line and bounce it off the rev limiter a couple of times. The coke can will be shredded and spat out in small pieces.
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“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[MarkJ]

I reckon you'd probably get away with getting the bike really warm beforehand (so it runs quieter) and increasing the revs in tiny bits until you're told to stop. I've done this before and was told to stop 500rpm before where I was meant to, which might be enough to get you through. That was at Cadwell.

[RhynoCZ]

You might could get another silencer into the system, like on a car, where you've got like 2-3 silencers, but I think it'd very noticeably effect the powerband

I say, get better earplugs, cut that muffler off and ride it like a crazy person

EDIT: That's how I rode my GPz when I didn't give a damn: https://i970.photobucket.com/albums/ae184/RhynoCZ/New%20exhaust%20system/Fotografie-0011.jpg

PS: So loud I had to wear ear plugs, the bright side was, every one let me overtake even when I didn't want to. It's before the paint job
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'87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor

[whitedevil]

What track is it, i know some of them now have db testers around the track so just getting through scrutineering isnt the only problem as you'll get black flagged if you're to loud.
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GPZ500 sold ~ CBR600FS-2 sold ~ ZX6R sold ~ Street Triple R

[MG#43]

Though I'm gonna take a red bull can just in case, I'll look to rev a little lower when asked and get it a bit warmer to start out. A coke size can wont fit as the exit port is no more than about 45mm, inlet even smaller, neither end unscrews they are revited on.

I'll use the can as a sleeve over the baffle, maybe crushing the centre around it to keep it in place and prevent it from rattling too much.... I'll prob still have to crush it to get it in there in the first place.

Track is Brands, I'm sure they have spoken about the drive-by tests before so presume they'll have the kit. I might whip the exhaust off my road bike just in case that fits... Thanks for the replies!!

[Walloper]