The Boost Gauge is Dead to Me!

Here's a tease. I've got an engine on the dyno and I've made four pulls. The first was naturally aspirated and the remaining three were ran with an identical twin turbo setup, running exactly the same 20 lbs of boost. The engine made 580 hp without turbos. The three pulls at 20 lbs of boost ranged from 1,044 to 1463 hp -- a 419 hp difference at the same boost ... but not the same MAD (manifold air density). Actually when it comes to engines, there are three air density values that really count. They are; AAD (ambient air density), BAD (boost air density) and MAD (manifold air density). If you're into forced induction and all you know is boost...It's time to up your game! At Banks we've been supercharging since 1960 and turbocharging since 1965. We've wanted an instrument to measure MAD and all the rest but it didn't exist. So, we designed and patented one, eight years ago. Since then it's been a versatile and indispensable development tool on all our engine and vehicle programs. If you're into horsepower, take an hour to watch this, you won't be disappointed! Gale Banks