please help fuel problems?

[GsX2Nv]

Ok i just got my 255 fuel pump high pressure and 550 pound injectors and i alrdy had a afc install but now i am having problems wheni get on it around 4500 rpms my can loses alot of power does anyone know why this is. it starts to bog and jump. should i cut fuel or should i get a fpr? im not shure and advice would be helpful thanks

 

[temfate]

With the 255 HP you really need the FPR setup, I don't think it would cause what you're seeing though. It would just cause your low end and idle to be way to high pressure causing rich mixtures and the ECU would kill your fuel trim trying to fix it. Thus it would fight your AFC. What does your logger show is happening?

 

[boostid]

Mine did the same and I tried everything to fix it. But I was getting it with stock injectors. I thought it was fuel cut, so I dropped 550s in. didnt help. I changed my ECU and it worked.

 

[Rick4g63]

I have a walbro 255 lph, RC 550's and the POS T-25 awaiting a FP 2065.
My settings are:
hi
1k-20 2k-20 3k-18 4k-16 5k-14 5.5k-12 6k-8

lo
1k+36 2k-10 thru 6k-10

Stock fpr with my bov vented. At 16 psi my EGT reading around 850°c at 6k rpm.