diamond jim wrote on 06/08/09 at 15:32:46:Charon wrote on 06/03/09 at 06:19:07:I rather wonder why the "stock" curve cuts off sooner than the "Supertrapp" curve. Looks to me like the "stock" curve may have still been climbing. The very sharp drop at the top looks to me like a throttle chop, although it could have been a rev limiter. If it's the rev limiter, why is it different between the curves?
Don't think it was a rev limiter. My guess is that the stock exhaust reached it's max flow, the operator felt the effects, saw that the bike reached it's limit and let off the throttle. I've hit that limit before when experimenting with different baffles and to a lesser extent different intakes. BTW, now I know for sure what 6K+ rpms on this motor sounds like. I can say with certainty that I've never hit 6500 rpms with my motor. Truly sounds like she's gonna blow up!
Here's mine:
(see below)
Max HP: 33.19
Max Torque: 36.40 ft lbs
Temp: 87 F
Setup:
55 pilot (no bleed holes)
1 washer
155 main
A stock bike seems to dyno about 28-29HP. The LS650 with Sportster muffler and 1/2 spacer ran 29.8 HP. The Supertrapp guy said peak 28 with stock muffler then his Supertrapp tested similar to my bike HP wise with 32-33 (no torque curve or numbers though) with air temperature of 22 degrees cooler than my run today. Don't know if that makes a bit of difference though.
http://www.thumperpage.com/articles/ls650exh.html 
You might get 50+ by turbo charging... one fellow here is talking about it... search
It's been said that 50 is max otherwise.
It'll take a new carb and air filter, level 2 cam from lancer, some exhaust porting and a new header. And a lot of dyno work.
With a edelbrock QSII, I was able to take a stock with supertrapp from 82mph uphill to 97 with a pause in the middle to coordinate a pass.
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