I have a surging problem.
85 HJ75 ute with a 12HT swap
rebuilt 12HT (supposedly for more power)
30% bigger injectors
max fuel screw basically all the way out. the other screw on the firewall side is set such that there is minimal smoke while accelerating.
steady driving at 65mph/10-12psi boost. surging comes and goes, but is definitely happening intermittently at 65mph, generally boost sits at 10psi. boost fluctuates between 10-12psi under steady power, or increasing power to maintain 65 on inclines.
No noticeable surging at 55mph, or 60mph, or while accelerating.
I originally had the fuel return plumbed to the fuel in line to the engine thinking this might be the cause. I re routed the return to the rear tank and no change.
Any thoughts?
85 HJ75 ute with a 12HT swap
rebuilt 12HT (supposedly for more power)
30% bigger injectors
max fuel screw basically all the way out. the other screw on the firewall side is set such that there is minimal smoke while accelerating.
steady driving at 65mph/10-12psi boost. surging comes and goes, but is definitely happening intermittently at 65mph, generally boost sits at 10psi. boost fluctuates between 10-12psi under steady power, or increasing power to maintain 65 on inclines.
No noticeable surging at 55mph, or 60mph, or while accelerating.
I originally had the fuel return plumbed to the fuel in line to the engine thinking this might be the cause. I re routed the return to the rear tank and no change.
Any thoughts?