I have a aem fpr that mounts to the rail. With my new motor setup im going to go for 600-700whp.

My question is what ORIFICE should I use?

The FPR came with three.

My fuel setup:
Walbro 255 intank
bosch 044 inline
aem fuel rail
aem fpr

 

based on my past aem fpr failures, even new design or not, i dont trust them. i am not certain what orofice you should use, just offering my exp with the aem fpr. i had 2 fail on my customer cars, one hydrolocked an engine and shortened a rod.

again just my 0.02.

 

are you talking about the return line?

 

I ran the largest orifice in my 2 old AEM Reg's, my base was set at 50psi and I never saw pressure drop with an Intank and Inline 255. What Injectors are you running?



The reg comes with 3 orifices IIRC, they go inside the regulator and you size them depending on your target fuel pressure.....

 

Im Running the Injector Dynamics 1000cc SAT's.

So i should use the largest one?

 

Based on your setup I would say use the middle sized one . As long as you can get your base pressure where you want it you will be fine . if it dosent go low enough for you then you may need to go up one size if so .

 

where can you get different sized replacement orfices?

 

I would try the middle one but I dont think you will have trouble making 100psi base with the largest one. The problem is the AEM reg is highly unlikely to survive at that pressure and it is out of place in your fuel system. The Weldon Reg's that ends with part number 2015 (i think thats the number) are good for 100base and the new Fuel Lab reg's are rated the same, they are what you want to use. Then again you might not need to run the fuel pressure up that high for 700hp, so you might be ok.

From the company that makes the regulator, www.aempower.com would be a good place to start, never had to buy new one's the regulator comes with them.

 

i didnt know they had an orfince in the inside,
ill better check mine, to see what size is it, is it writen on them or anything?

 

I'd switch regulators if you plan to go over 80PSI of fuel pressure, or over 20 PSI of boost. The AEM's are pretty sketchy at those extremes.