I've got a BEGI FPR sitting under my house that I bought 2nd hand here from UofC Cats when I first did my turbo install about 2 or three years ago (bought with a Pierburg aux fuel pump).

I've never installed them, and I am wondering now why I bought them, and particularly, how I would know if I needed to install them.

I'm running 1.8 injectors from memory, on an EManage Blue - about 8-9lbs - Olderguy's O2 switch and the stocihmeter always shows rich on boost.

So what exactly does the RRFPR do and how do I know if I actually will benefit from fitting it?

 

you use it when your injectors can't supply enough fuel to keep you rich in boost

 

They raise the pressure of the injectors to make them work like larger injectors. If you start going lean, then you need to install the afpr so you get more fuel durring boost. They do nothing out of boost.

 

is it even possible that you aren't running lean in boost right now?

 

i wouldn't think so

we need an engine popping smilie

 

Can you see what your duty cycle looks like with your EMB? As long as your DC is safe you should be fine. Ideally you should sell that AFPR to fund a larger injector purchase.