Root of all Evil

I have a 83mm bensen sleeved b18c5 with a t3/t4 60 trim running 10psi. Fueling is 680cc injectors and an walbro 255hp pump. I have a plx wideband on the car as well. The car has always run amazing until this season, When I am full throttle in 3rd gear the I have perfect afr-11.4 at 6900 rpm and then suddenly right at 7k the afr goes off the chart rich and bogs the motor down. This happens in gears 3, 4, and 5 under full throttle. Does not seem to happen in second, this I find confusing but it must have to do with shorter gears and less motor load. Car has a 3 bar map and is tuned on hondata s100 in a p28.

What should my fuel pressure be at idle with a walbro 255hp pump? Any help is greatly appreciated.

Thanks

AlexDphoto

My fuel pressure on my turbo gsr at idle is about 45-50psi for reference.

maybe you need a retune?

E85B18

Did you change the gears?

2k.civic.si

"What should my fuel pressure be at idle with a walbro 255hp pump? Any help is greatly appreciated."
whatever your tuner set it to when the motor was tuned.
if you have not changed the tune then i would start checking physical things like fuel pressure under boost and boost pressure to see if its dropping off after 7k.
the real easy way to find the problem is datalog the car when it has the problem that will tell you instantly

Root of all Evil

stock itr trans and fpr so fuel pressure was never adjusted

TheShodan

iTrader: (14)

sounds like something else. what course was this occurring here. what course?

Root of all Evil

Mosport-Big Course

Booked the dyno for friday, will post results