bumping also does one other thing for front wheel drive - strains the engine mounts . . . and works the exhost flex joint . . . that's two!
How is a bump start any different than a hard shift? My bump starts are so smooth that it feels no different than a shift at partial throttle. The only real difference is that the strain on the engine mounts and exhaust flex joint is in the other direction.
The loss of power brakes could be overcome relatively easily with a small vacuum pump fitted to a vacuum reservoir (which probably already exists). Turbocharged cars have these, and I'm willing to bet you could source the parts on the cheap. The control system can't be terribly complicated; just a vacuum switch and maybe a relay.
My (very old) turbocharged car doesn't have an electric vacuum pump. If I floor it at 30mph in 5th (so not much acceleration, but some positive boost from the turbo), after 3 pushes of the brakes, they fade out!
__________________ Team GasMisers5 - #1 for first three rounds of the original GS Fuel Economy Challenge
Miles displaced by e-bike since 1 Jan 2008: 62.6 (0 kWh used)
Bump starting is a matter of how stiff your engine is and what gear you are in. The sticksion of a stopped engine may be greater than one that is rotating. With my Scion on Synlube it can bump start at 2mph in 2nd gear so not much of a wack to the engine mounts.
In our 5, a bump start at 10-15 mph is about like running over a cat. Not much drama to it - so long as you aren't the cat.
There is an issue with the power steering coming back online however. Apparently the control system doesn't like to re-engage it until the revs drop for several seconds. While that's not really an issue at higher speeds, it's not something I think I will be doing much of around town.