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Problem with an ICE that has its throttle stuck wide open is there's no vacuum, so the vacuum-powered brake booster stops working. (even worse on a turbo vehic
by pengaru 3y ago
Problem with an ICE that has its throttle stuck wide open is there's no vacuum, so the vacuum-powered brake booster stops working. (even worse on a turbo vehicle)
That makes things more interesting to say the least, and for a naive driver in a panic it would easily be perceived as "oh shit no brakes!" since you basically have to stand on the pedal without the vacuum assist - and that's without the engine fighting you IME. (I used to coast downhill with the engine off in my mx5 when we'd get stuck in stop-and-go Sunday traffic over Skyline Ridge heading to the coast @ Half Moon Bay. Not the easiest thing to stop once the residual vacuum disappears, and that's a small light car)
- jacquesm 3y agoThat's a pretty dangerous thing to do. In Switzerland it used to be that if you were caught 'coasting' that would be severely punished. Not sure what the state of that is today but it is asking for an accident. Vacuum is one thing, then there is the powersteering which at some point will fail and if you're going to want to do a hairpin turn down a mountainside without assist you better be ready for it.
- pengaru 3y agoManual rack on the car... it wasn't particularly dangerous, we're talking about a glorified go-kart on a sustained downhill in stop-and-go traffic, the engine just burns fuel pointlessly idling. The main issue is remembering to put the key back in the ON position so the steering column doesn't lock up. Then it's also ready to resume running, all it takes is selecting a gear and engaging the clutch to bump start the motor... approaching the bottom of the mountain pass.