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Re: [turbobike] Sound

Mon, 9 Aug 1999 08:42:49 -0400

I say keep gearing it taller until you don't need anymore of can't gear it
taller.  Of course, there are limits for street use.  It's a bitch around town
if 1st is good for 130mph.  I geared the FJ 18/38 (compared to 17/42 stock) and
it's great with the big displacement (1314cc).  The turbo spools up even faster
when you load it like that - it makes boost at 4000 rpm in 1st gear.  With the
stock rev limiter in place that's still only good for about 185 mph actual since
those bikes were only good for 150mph stock.  You do notice that there is a
minimum cruising speed in town due to the overly tall gearing, but it's not
really much of an annoyance.

I left the gearing alone on the ZX-11 (so far) since I knew if I had it I'd use
it, and that's fast enough on the roads we have in Michigan, I think.  It's
still enough to use all of the 200mph speedo (probably an actual 180+mph)  Now
if I lived in Wyoming or something.....


GSXRTurbo1@aol.com on 08/06/99 05:15:36 PM

To:   Turbobike@natvideo.com
cc:   GSXRTurbo1@aol.com (bcc: Bob Shammas/EQA/Nsk-Corp)

Subject:  Re: [turbobike] Sound

  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?