It can actually do it a number of ways... Rally style(for killing turbos very quickly), and drag race style... Each way uses a different algorithm for either retarding timing and injecting extra fuel based on TPS, deceleration delta, rpm, etc. The AEM is pretty robust when it comes to the versatility. It can also use an additional injector in the exhaust if you so choose, however, if only using antilag on occasion, there is no need. As I mentioned, I can build as much boost as I would ever need sans an exhaust injector. Exhaust valves can take a beating after a while though... I recommend no longer than 3 seconds of antilag at a time. Since the Miata is my road race car, I only use antilag when I am extremely bored and feel like hearing some banging and popping.

Justin

The main reason is that turbo work off load. When the car is at idle there is little to no load so the turbo doesn't strong volume of exhuast. I think the most boost I built at idle was 4# with my 20g