I believe designs that do not use tubing or bungee or spring assist can exceed 80psi piston speed.
Specifically, mechanically latch the kicker, pre-charge the kicker with 60psi, leave the opposite end of the cylinder vented to atmosphere (no restriction), then release the latch.
I favor a rule requiring all kicker pistons to have hard external stops. That gives the inspectors clear guidance and they don't have to make subjective judgements on-the-spot about whether or not it's required.
http://www.chiefdelphi.com/forums/showpost.php?p=911424
http://www.chiefdelphi.com/forums/showpost.php?p=911299
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