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I had posted this information on a few sites, so I thought I would put it up here.Alright, I've read all over about the power valve issue. Does it work? Does it make a difference? Any dyno hard results? etc., on and on. Well I have some dyno charts for my setup and we specifically were playing around with the PV setting. From blocked off thru 1.75CC (counter clockwise).The following charts are for a HPR#19, taper bored TM38, dune porting, open intake, VF2 reeds. The charts show torque and I will not post Q vs HPR pipe HP numbers because those always get into pissing matches.I just wanted to show that on the 500, the PV does impact your power curve. I've highlighted all curves since they are hard to read if I didn't.FYI... I've heard and it makes sense to me that based on oil temp, the PV will open at different points. My test results for my engine seemed to like 1CC PV setting when running the Hall HPR#19.These are Torque numbers only as I don't want these threads to start any HP wars.PV blocked closed:PV set to 1.25CC (Q pipe recommended setting):PV set to 1.50CC:PV set to 1.75CC:PV set to stock 1.00CC (best for my bike):So in short, if your a drag racer running only WO, then blocking it off closed won't impact top end RPM / Power.If you do anything else, it can greatly impact your power below 6k RPM.... you can even screw up and set it to 1.75CC or more and it will kill your top end.EDIT 10/16 - Adding run info.These were all from Hall's dyno in Phoenix, AZ on June 27th, 2011.My Setup: 500 Fanatic - HRD porting (HRD rebuild completed 8/2010), Ears re-inforcedHead - Squish fixed & o-ringedTrans - M102B8ES .020 gap plug w/5k plug capOEM stator, coil, ECU, stock timingHPR#19 PipeVP110 w/927 @ 20:1TM38 bored to 41mm carb w/640 mainOpen Intake w/ 4x8 Uni Dual Layer w/OuterwearQ cut pistonVforce2 reedsDyno Info: (Dyno tires used, Absolute Pressure: 28.5 in-Hg, Air Temp: 90.5* F (Outside temperature in Phoenix was 115* F), Humidity: 27%, Altitude: 1100 ft; engine warmed to same CHT for each pull set, multiple pulls taken to confirm curves)
..........A setting of 1 turn (5700rpm) with a PT pipe would have a dyno run that looked like 1.25 turn with a Q pipe. You held the PV open to long
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