Why would you expect them to be significantly different ?
There are of course no official numbers available for those particular Wilga engine after-market modifications, but, letâs consider the numbers for the 35A which are published:
Vx = 57kts, Vy = 62kts
If we then take into account the higher cruise speeds of the 80P and 80X you roughly should add about 8-10kts to Vx and Vy for the 80P and 12-15kts for the 80X.
Hope that helps 
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Electric starters(especially from the 1960âs) are just heavy too, a burst of air or a shotgun starter is very light in contrast. Air starters do have their problems though, in the winter moist compressed air does freeze, freezing essentially everything in its path including valves and air lines, If you let the machine sit for any time the air does disappear, leak out, so you do need to replenish the air with a compressor, they are LOUD. I remember some transport trucks used to have air starters from the 60âs and 70âs, the customs officers here at our Canada USA border absolutely hated them, they almost jumped out of their booth because of the sound lol. Iâve never heard an air starter on a plane before but I could imagine it is still pretty loud(maybe not nearly as loud as a big diesel engine). It is a cool system though.
I take most of that back(about being loud), I just watched a video of a wilga startup, itâs actually really quietâŠ
Thanks your your perspective. I had read the Polish 35A doc and saw the 62kts figure in there that it youâre supposed to climb at the 8MP 2050RPM setting (which kinda seems like a cruise climb) and thought it was really low for the higher power engines, so I appreciate your suggestions. I know they are not official numbers for these planes, but I donât know enough about it to infer to my satisfaction.
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I donât know. Maybe because the official published numbers are for a 260 HP engine and we have a variant with a 450 HP engine. Seems significant to me. I mean for example, the official 35A manual says the plane wonât roll for taxi until 1300 RPM, but my plane starts rolling at 700 RPM. These are pretty significant differences, wouldnât you say?
The horsepower difference is significant hence more thrust, however why would that necessarily effect Vx and Vy ? it is the slope of the power curve rather than the actual amount of power that matters.
Basically Vx is the speed where you have the most excess force (thrust), and Vy is the speed where you have the most excess power (horsepower):
So the amount of power or thrust is not what matters it is the speed where the excess power or excess thrust peaks. Would a more powerful engine have different Vx and Vy , yes if the power curve is a different shape but not necessarily. Note that a more powerful engine may well be matched to a different prop which might also effect things.
The higher horsepower variants will also likely be heavier and have a different CG which will clearly have some effect on Vx and Vy but it is not likely going to be that significant.
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Stupid question - Throttle controls Manifold Pressure (MP) and Prop lever controls the RPM right?
yep, thatâs correct, within reason of course. If you lower throttle a lot, RPM will drop as well, regardless of your prop lever setting.
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For anyone interested in the flightmanual, I found a german Flugfibel for the Wilga 35 on pdfcoffee.com Its a 54 page pdf document 
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Saw that yesterday and I wanted to come post it here, but forgot because of the snow storm. Another great review for a great plane made by great people.
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Just bought this, itâs brilliant in VR
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Itâs brilliant in FlatâoâVision too 
(Track IR helps!)
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Especially when trying to find the fuel gauges, conveniently placed exactly where you canât read the bloody things without moving your head around 
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Anyone figure out why various models/liveries load up with some visuals not working? I have tried repeatedly to get a couple liveries loaded up (the zebra skinned 80x from flightsim.to most recently), and despite repeated tried the throttle and mixture levers donât move, along with various switches.
Has happened with default skins as well, but they typically âfixâ themselves by exiting and reloading the flight.
I hope today itâs last Thursday without Wilga on Xbox 
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Iâm not sure holidays in France wonât extend into the new year. Europeans (UK not included) do like to stretch them.
Hope dies last
I would not expect the Wilga before mid to end of January.
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Trying to bind some custom MobiFlight controls to the Map Zoom buttons, does anybody know what this LCD display is based on (ie 530, G1000 etc)