: Many rally
cars are turbocharged. However, your mentioned turbo-lag
is a real pain in the ass for them as they are constantly speed
ing up and slow
ing down. Someone came up with a neat workaround
for this: as the car slows down, the turbocharger is kept up to speed by the injection of fuel directly
into the exhaust pipe
, which is then ignited. The resultant explosion
mimics the effect of exhaust at high speed, driving the turbine. This is why you hear a lot of bang
ing noise as a rally car slows down to take a corner.
To do this on a normal road car would be outright insanity. Not only would you probably cause severe injury to anyone walking past your car, but the exhaust pipes wear out really fast; I don't know exactly how long they last, but I think its tens of miles.
I don't actually know anything about this sort of stuff. I was told all this by an "engines-hacker" friend of mine and thought it was cool. /msg me with corrections.