Tech q: Begi AFPR - why to use it, when to use it and how do I know - Miata Turbo Forum - Boost cars, acquire cats.

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Old 10-28-2009, 10:59 PM   #1
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Default Tech q: Begi AFPR - why to use it, when to use it and how do I know

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?
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Old 10-28-2009, 11:18 PM   #2
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you use it when your injectors can't supply enough fuel to keep you rich in boost
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Old 10-30-2009, 07:39 PM   #3
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Originally Posted by Uncle Arthur View Post
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?

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.
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Old 10-30-2009, 08:40 PM   #4
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is it even possible that you aren't running lean in boost right now?
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Old 10-30-2009, 08:45 PM   #5
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Originally Posted by budget racer View Post
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
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Old 10-30-2009, 08:53 PM   #6
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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.
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