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2 different Walbro 450 - F90000267 F90000274

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Looking at your info and log, I would think that 76lb/min would be a little more than 661whp. You auto or 5spd? Airflow numbers dead on?
The 661whp I made last year at only 37psi flowing 66.1lbs @min. The car is running different set of cams and 5 more psi of boost. Here’s a pic of last years log with airflow well calibrated. 5spd car
 

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Just put your fuel pressure input on a switch with your wb on the other end. Switch between inputs if you want to check fp on a pull.
 
Just put your fuel pressure input on a switch with your wb on the other end. Switch between inputs if you want to check fp on a pull.
I thought of that but how would I check my afr’s on a pull to make adjustments ? The gauge tells me the pressure but switching back and forth on a pull would record either wideband or fuel pressure not both correct?
 
The reality is you only need to check fuel pressure maybe once or twice ever. It’s a diagnostic tool not used for tuning. Once I verified my fp is on point I never log it after that. It’s totally not needed but it’s available by switch if I need to verify it on a separate log.
 
That's not a bad idea, But i'm guessing you are at the limit of that pump. Realistically i see the 525pumps even the ones without check valves maxing out around 650whp on mustang dynos. So going off ur lb/min you should be right there.
 
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