A quick post on anti-lag theory by one of the DIY-EFI people:
Dave Vizard invented this idea for turbo pinto 2000's. Tis quite simple
really. Take one standard kit to make about 25 horsepower - yup almost
nothing. When activated and throttle romped to almost WOT, turn on. When
boost reaches minimum desired, turn off. If engine can't sustain boost,
cycles automatically to maintain minimum boost.
He emphasizes that it takes very little to do this. The extra NOS & fuel
generate an increase in molar gas product and higher exhaust temperature.
This quickly spins the turbo up. Once spun up, no longer any need to NOS
the system as the turbo is shoving much more air into the engine.
Biggest problem was to find NOS nozzles SMALL enough to make work reliably
and consistently with a decent spray pattern.
The solenoid needs only to be a high pressure 1500+psi on/off with computer
control. Once the injectors and the EFI are calibrated, getting the
additional fuel at low mid ( where boost assist is normally needed ) for 25
hp should be well within simply stepping the injectors.
And if you are turning on an alcohol/water antidetonate system anyway, you
could just add a tad more alcohol/joy juice with the NOS on to make the
small amount of extra fuel needed.
One of the nice things was that using this setup, a 10 pound bottle was good
for a hundred or so pass's at the track