HW/Weihrauch Hw90 .25 tuning transferport help

[scottc]

Thank you for OEM stroke dimension and mod, I tucked away safely as I have same model. Their are a series of these schrader valves in the racing world at different RANGES PSI/BAR
https://www.schmidtyracing.com/Schrader-Valve-Cores-p/n-ft-shr-c.htm
With HW90 OEM valve at 377PSI/26BAR, and Theoben's reported at 700PSI/48 BAR, seems like you might need a higher spec Schrader-Valve-Core to push 25+fpe? Seeing a Theoben .25 shooting 25fpe was how I found racing valves.
My unit is happy from 12 to 18FPE @ about 13/15 to 20BAR, so I'm a happy camper. But with slider weights fingered together, a valve running from 40 to 800PSI, reactive or stepped plenum chamber volume adjustability, Weihrauch would have a sweet upgrade and be front of the pack for self contained adjustable break barrels for the next 20 years or so. I think 10 to 30fpe range might be possible. Isolate the recoil ala Norica Omnia ZES or Diana 54 tech would push into bottom of adjustable PCPs.

 

[Theoben Eli.]

After fitting the new cup seal and drill the tp to 3.4mm power dropped to 205ms 20gr pellet. Even it have a 90mm stroke.

Looks like the tp size to big and lost its peak pr wave. The red aussie seal have a bit of slow burn damage on it.
Thats cause higher peak pr with 3mm tp.
Not sure what to do, fit new aussie seal and try again?
Tp back to 3.0mm?

The notek seal not preformd wel loose fit. Now oem seal tight fit seal lost 45fps. Oem seal have a very to tight fit
Been a patchute seal its even have more frition when fire it. Lost some piston speed whit it.
Maybe convert to O ring seals no risk on slow burn and low friction speeds up the piston speed