Can i use a low/high-imp injector combination?

[Justen]

I think a pfc is what i'm going for. From what i understand, Banzai Racing carries the adapter harness and map sensor that will let me use the FD pfc in an S5... and they'll install resistors into the harness for low-imp injectors for a little extra.

The options we use around this are either resistors, or the FJO injector driver box, this converts the signal to use the injectors as they were designed as peak and hold. More fuel is available by using the injectors as peak and hold.

If I understand this correctly, an injector driver box/module will work better than individual resistors? Only the box will convert the injectors to peak and hold? Or will the individual resistors also convert them?

[dudemaaan]

Originally Posted by Justen

I think a pfc is what i'm going for. From what i understand, Banzai Racing carries the adapter harness and map sensor that will let me use the FD pfc in an S5... and they'll install resistors into the harness for low-imp injectors for a little extra.

The pfc is a good choice, you should get the datalogit also. I can't imagine using a pfc without the datalogit. You will also be able to use the fast reacting air temp sensor. See the thread in my signature.(Here) The open element IATs allows much more precise tuning and a more accurate air temp table. If you do decide to go with the improved IATs you might see if Banzai will install a bosch connector on the IAT harness. The sensor uses the same connector as aftermarket bosch injectors so it shouldn't be a big deal for them to do. Or you could install it yourself, it's simple enough.

Originally Posted by Justen

If I understand this correctly, an injector driver box/module will work better than individual resistors? Only the box will convert the injectors to peak and hold? Or will the individual resistors also convert them?

The injector driver works better then the resistors. The resistors only protect the driver circuit. It doesn't convert the signal, they also make the reaction time of the injector slower, which is why you should use the smallest resistor you can get away with. 1 ohm for bosch 1680's is probably ideal.

The injector driver minimizes injector "on time" and allows for faster response. This gives more control over the injector and allows for lower duty cycles and easier transition tuning.

In reality most hesitations caused by large secondaries with resistors can be tuned out. If you don't mind spending extra money on the driver box, and want the extra response then by all means go with the driver box. It's not worth the extra money for me though.