In the 1980s, Lancia developed a supercharged and turbocharged (aka twincharged) engine for their midengine/AWD Delta S4 Group B rally car. The idea was the two compressors would eliminate any kind of lag in boost. It doesn’t look like it worked out that way.
The art of the hillclimb is one of loose limbs, intense focus and raw power. Combine those and you've got a stopwatch-murdering time, as long as you've got the shifting skills (and accuracy) of an overclocked cyborg. Watch.