Anyone know what the size of the stock beta 2 injectors are?

How much boost can i go with stock injectors?

Anyone know what the responce time is?

I am working on my AEM FI/C. This is taken from there fourm.

For every fuel injector, it takes a certain amount of time between when the ECU applies power to the injector and when fuel actually begins to spray out of the injector nozzle. This is sometimes referred to as injector dead time, injector response time, or battery offset (because the amount of time will be different depending on battery voltage).
The FIC compensates for Injector Response Time as follows: let's say the Injector Response Time is set to 500 us (0.5ms). This is assuming that when the stock ECU holds the injector open for 2.0 ms, the first 0.5ms of that time is spent opening the injector (without any fuel flow) and the next 1.5ms is spent actually delivering fuel to the engine. If you want to add exactly 100% more fuel, you should hold the injector open for (2.0 - 0.5) = 1.5 ms longer than what the stock ECU was doing.
The time spent opening the injector doesn't change, so the total fuel pulse to deliver double the fuel should be 0.5 + (1.5 * 2) = 3.5ms.

 

I doubt anyone knows that injector timing answer. I would just assume their 0.5ms estimate for your calculations. You'll still have to tune more once you come up with an idea to try.

IIRC they're 190cc injectors

There won't be a set amount of boost, I mean there would be a theoretical maximum when the injector would be open 100% of the time but your efficiency would be way down way before you hit that point.

 

I have my stock alpha injectors set at 1ms for the opening time. I feel this is pretty much the standard.

 

I will tinker with it more this weekend and sees what happens.