when do i need a resister box for my injectors? i know that it has to do with be saturated or non saturated, but i can't remember which is which.

 

You need a resistor box when using the "peak and hold" type of injectors.
To find out what type you are using, just measure the coil resistance of the injector.

2 ohm coil = peak and hold type
12 ohm coil = saturated type

Hope this helps

 

To answer this question based on your other posts, OBD1 injectors are saturated, and do not require a resistor box.