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Post by headcoats on Mar 24, 2023 10:24:43 GMT 1
Has anyone done any dyno runs and seen any dramatic gains or losses by trying different settings ?
Does the valve need to be out the way as soon as you are in the powerband etc ?
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Post by crogthomas on Mar 24, 2023 10:55:17 GMT 1
I've seen a few tests over the years. eg: www.rzrd500.com/phpBB3/viewtopic.php?t=1704I think most concluded that fully opening the powervalve earlier would be better. Do you have the opportunity to try different settings? |
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Post by headcoats on Mar 24, 2023 11:09:14 GMT 1
Quote
Why not do 3 dyno runs with the valve fixed at closed,half and open positions and then have the dyno graphs overlaid to "connect the dots" or in other words to find out where the valve needs to be to produce the most hp?
I'm sorry I don't know how to explain any better,but it stands to logic this is the best way to have the valve make the most of the engine
Has anyone tried this
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Post by derek500 on Mar 24, 2023 16:31:26 GMT 1
The guy in Greece (two stroke labs?) repaired a pv controller for me and offered to fit dip switches so I could alter it on my rd500, seem to remember it wasn't much more cost, anyway played about with it and found PVs opening later felt better, seems like more mid range torque. Depends what you want really I didn't want outright power.
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Post by bare on Mar 25, 2023 0:32:27 GMT 1
No.. No dyno runs just a summers' experimentations.
Which resulted in PVs set to open early.. about 4k and fully by 5.5k
Yess ...totally contrary to Dogma
IIRC though..as I have forgotten exact settings, I've had no reason to revisit / try to improve.
This gives best power (seat of pants :-) and Running.
Zero flat spots.. using WOT in Any Gear from 2500 to Revlimiter.
Pulls strongly with no hesitations, stumbles or other Eff ups.. I like it.
No idea on power output etc. But I find it thrilling.
Not my 600RR thrilling.. but certainly good 'nuff for my 40 yr old Yama.
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Post by jon on Mar 25, 2023 13:09:47 GMT 1
Quote Why not do 3 dyno runs with the valve fixed at closed,half and open positions and then have the dyno graphs overlaid to "connect the dots" or in other words to find out where the valve needs to be to produce the most hp? I'm sorry I don't know how to explain any better,but it stands to logic this is the best way to have the valve make the most of the engine Has anyone tried this I’m not quite sure I understand the logic? Surely you will only get three points where you can pick the best BHP? Far better to compare complete dyno curves from various settings. Also every setup is different. What works for one might not be the most efficient for another. Bare clearly has forgotten his setup as I’ve seen multiple posts of his setup that all vary from where it starts pulling cleanly to PV openings at different RPM to Rev limiter settings. No.. No dyno runs just a summers' experimentations. Which resulted in PVs set to open early.. about 4k and fully by 5.5k Yess ...totally contrary to Dogma IIRC though..as I have forgotten exact settings, I've had no reason to revisit / try to improve. This gives best power (seat of pants :-) and Running. Zero flat spots.. using WOT in Any Gear from 2500 to Revlimiter. Pulls strongly with no hesitations, stumbles or other Eff ups.. I like it. No idea on power output etc. But I find it thrilling. Not my 600RR thrilling.. but certainly good 'nuff for my 40 yr old Yama. Sigh.. MY 1ua with pwks and (condor) Microns, mit Zeel has ZERO flat spots / stumbles... anywhere. Pulling cleanly, WOT from 3000 rpms on up, with throttle cranked Wide open .. Regardless of Gear... right up to the rev limiter at 9500 rpms. Did take some experimenting with the PV settings to get there tho. Factory settings are simply Sad / Laughable. As are 'Internet wisdom' suggestions :-) My pve are programmed to open at 5k rpms and are wide open by 6K rpms. Heresy !! All I know... is that THIS setting produces; Happy results / perfect miss /stumble free power delivery, WOT throttle to rev limiter. every single time . I think mutts told me a LC requires a larger pilot and smaller main compared to a YPVS Waiting for Bare to wake up and reply No.. you are absolutely right .. different engine... a Moderately tuned one at that ., although steadfastly using the LC's airbox. Again: 40 airs, 130 mains, JJH. Zeel set fairly aggressively, the PV curve being set Very aggressively :-) It runs a bit rich..intentionally. Yet it All works... ZERO stumbles, huntings.. etc. Clean solid pull, WOT from 3500 until the rev limiter (10 k). Can't see it running better, consequently I'm absolutely Not going to Eff with it further. |
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Post by headcoats on Mar 25, 2023 15:00:37 GMT 1
Just be interesting to see dyno runs on çlosed,fully open and halfway
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Post by jon on Mar 25, 2023 15:12:03 GMT 1
Just be interesting to see dyno runs on çlosed,fully open and halfway I can only assume you want to run without a servo? Jon |
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Post by headcoats on Mar 25, 2023 15:34:12 GMT 1
Merely an observation of the powervalve workings
Don't think I have ever seen this on a graph
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Post by midlifecrisisrd on Mar 25, 2023 16:40:28 GMT 1
I can see the point he is making
If you set the valve fully closed and it made peak at 5k, half open was 7k and full open was 9k it would show you need to open on a linear curve from 5 then full open at 9k
If closed was 6k, half way was 7 and full open was 10 you would ideally have starting to open at 6, half open at 7 and full open at 10
Steve
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Post by headcoats on Mar 25, 2023 17:09:04 GMT 1
Need Dave Mutts to have a day where he is twiddling his thumbs and say fook it for a laugh 😅
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Post by muttsnuts on Mar 27, 2023 21:22:46 GMT 1
have played with PV settings, do it all the time when I fit iggy's etc, some gains are to be had by changing the settings, that said, each bike can gain in different ways as it depends what exhausts (primarily) are fitted and also if any porting has been done, carbs etc have less of an effect, as does reed valves/petals etc, but again, the variables have a part to play
I have done it on a few stock bikes, but again, with an iggy etc fitted, so not exactly stock and of course the iggy allows me to change the timing etc to suit the engine etc at differing RPM's, which can then be matched to the PV's timing etc, you can certainly lose a day playing with stuff like that
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Post by urbantangleweed on Apr 6, 2023 8:13:09 GMT 1
The MT350 made an extra 10BHP just through altering the valve opening sequence, ignition timing and carb jetting (Zeeltronic PCDI10VT) so yes, decent gains can be found.
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