How to know if i need an afpr?

[91talonawd]

I bought 550's, safc, and a walbro 255 pump i think its the hp but i am not sure but i am going to install them this weekend and i want to know what will happen if i don't get a fpr?

 

[genxxxracer]

Nothing really. Just make sure you run it really lean like -25% and get a datalogger if you dont have one already.

 

[out there]

i believe the general consensus is that with the regular 255 you'll be ok if you edit the flow just right with the afc, it's the high flow 255 that you NEED the fpr. nonetheless, a fpr is recommended with anything about 190 (i just learned that this week yay!)

 

[Mindslayer]

I have the walboro 255lph and 750cc injectors. If you want to watch your fp and adjust it. I say get the bm fpr and gauge. they are cheap and work my base fpr was 48 and i back it down to 43. And you can get both of them for 90 buck or less.

 

[larryd]

Originally posted by Mindslayer
I have the walboro 255lph and 750cc injectors. If you want to watch your fp and adjust it. I say get the bm fpr and gauge. they are cheap and work my base fpr was 48 and i back it down to 43. And you can get both of them for 90 buck or less.

Id sure as hell like to know how you did that since the B&M FPR only increased fuel pressure, it cant lower fuel pressure and its not a true 1:1 AFPR.

 

[91talonawd]

What will happen if i don't get one and what are the sypmtoms i just all my stuff today and i was going to put it on this weekend?

 

[larryd]

What will happen is say you set your base fuel pressure at 39psi. Theoretically when you run 20lbs of boost you should be seeing 59psi of fuel. Without a true AFPR you may be seeing either more then 59 which would cause the car to be laggy and slow or less then 59 causing the car to be lean and dangerous. Get the point?