You can't always hit runaway in the driveway.
Keep in mind that the slide collar can't move much past 1/4 throttle with a working afc.
So you can't technically get full slide collar movement (which controlls when it runsaway) unles you are under full boost.
Obviously I'm bringing this up because even though I know my pump pretty well and tested for if it was going to do it in the driveway........the second I hit 45 psi on the boost gauge while driving she took off like a bat out of hell.
Luckily I was able to stop it while slamming on the brakes and I was still doing under a 100mph