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Re: [turbobike] Sound

Fri, 6 Aug 1999 17:15:36 EDT

  I have an 86 GSXR1109 with a Mr Turbo draw thru 42mm Mikuni HSR carb. With 
the supplied exhaust w/cannister it is fairly quiet. However, with a "banana 
pipe" it is EXTREMELY loud. It also has a sound like a 4cyl car without a 
muffler, it doesn't sound like a bike at all. I thought it would quiet down 
somewhat when I installed my JE 9:1 pistons, but it is just as loud. I guess 
its not the compression ratio making it loud. I also run a 2 1/2" pipe to a 
4" super trapp baffle (its just the disks without the cannister or packing, 
pretty trick actually) and that quiets it down somewhat, but still nowhere 
near as quiet as the Mr Turbo supplied cannister. The only problem with the 
Mr Turbo cannister is that its too restrictive. My EGT's are noticably higher 
with that exhaust in place. I went for a ride today with the stock gearing, 
was on I-75 in 3rd gear going about 70-80 mph and nailed it. 2 quick upshifts 
and what seemed like a few seconds and I tagged the rev limiter (set at 
11,000 on my Dyna 2000), glanced at the speedo at it read about 150 mph. It 
seemed low to be tagging the limiter, but I know the clutch wasn't slipping 
as I have a MRE lockup. What do the rest of you use for gearing? Gearing for 
top end v.s. 1/4 mile? Any comments/suggestions?