Blow off valve vs. By-pass valve (semantics aside)

[SIMON HOLTBY]

I have heard of cars that dump the air from the dump valve into the
exhaust manifold and inject fuel. This turns the turbo into a JET as it
spins at high rpm. High boost is maintained on the front of the closed
throttle valve so when it is opened turbo lag is eliminated. 
I dont know if anyone else has experienced this but sometimes when
starting the car the ignition timing gets confused, the car missfires but
I have noticed the boost pressure rise rapidly. This is due to unburnt
fuel entering and burning in the exhaust manifold ie exhaust valve open
and spark plug fireing.

Simon Holtby
84 urq


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