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Author Topic: LT500 Powervalve Dyno Results  (Read 5367 times)

Offline MotorGeek - Jerry Hall

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Re: LT500 Powervalve Dyno Results
« Reply #25 on: April 30, 2015, 07:27:51 am »

The 3 graph shows the inconsistency of the Power Valves closing RPM made back to back over a time period of 30 seconds.  The zig zags are produced when the valve closes at a RPM where the closing point is not at the optimum RPM.

If you flip the bottom line to time and not rpm it shows how quick the zig zag happens. Real quick.
Then you take it to the track and run it on timers, alot of times it will ET quicker with a little zig zag then with out.
Just a guess, but I think it helps set the bike / tires for a millisecond.
Makes you want to pull your hair out I know that.

Good stuff MotorGeek. thanks for posting 

I have found it is better to error on closing the valve a little too soon than a little too late. 

Looking at the graph and using a RPM drop of 1500 to 1800 RPMs between shifts, the optimum shift point would be around 7700 to 8000 RPM..  Shifting at 7700 to 8000 RPM will drop the RPM to the 6000 to 6500 RPM range between shifts.  If the optimum closing point is 5700 RPM on this engine package, closing the valve 500 hundred RPM too soon will not affect the portion of the power band you are using.  If you close the valve 500 too late the power will be affected in the portion of the power band that you are using.

 

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