Rb26 720cc Injector Max Out

[dreamers]

Hi All,

i have just completed my rebuild of my RB26 engine, spec are below

the tuner told me that i can't higher the boost due to the injector has already max at 85% or more. if we would to push 1.5 to 1.6 bar the air fuel will lean down. i have attached the dyno sheet.

The question is that i see some of the forumer here have smaller or similar size of injector but could push a much higher WHP.

Is there any problem with my setting or tuning?

RaceTech 86.5 mm piston

TOMEI 1.5mm @ 87mm metal head gasket with oil restrictor

Jun Oil Pump

Balance crank, piston, rod, clutch, main pulley

Refresh Standard Head

HKS step 1 IN/EX 264 cam

Jun Cam gear

BC valve spring

Greddy type 6 throttle intake manifold

SARD 720cc injector

HKS type fuel rail

Tomei Fuel regulator

Garrett GT35R AR1.06 split type

aftermarket ex manifold split type

Tial 44mm ex wastegate

Power FC D Jetro

ETC ETC...

Thank you in advance

DC

[O2 Autosports]

what's the rest of your fuel system like?

what's the fuel preasure/flow doing at full load?

[Dobz]

What fuel pump?

[GTR1993]

Put a fuel pressure and fuel flow gauge on. Will tell the whole story you need to know.

[dreamers]

Hi,

Asked the tuner and he qouted on idle was around 3.45 bar or so.

it is a twin 255lph walbro intank pump running on both standard fuel to front n single braided line back to rear.

[KiwiRS4T]

Would have thought 720cc capable of quite a bit more power. Pressure on idle is fine but Walbros flow chart shows flow drops off sharply when pressure goes up so I imagine having two of them won't change that. I guess adding an external Bosch 044 or two with a surge tank would solve the problem.-

[SimonR32]

Would have thought 720cc capable of quite a bit more power. Pressure on idle is fine but Walbros flow chart shows flow drops off sharply when pressure goes up so I imagine having two of them won't change that. I guess adding an external Bosch 044 or two with a surge tank would solve the problem.-

lol idiot!

[mico]

[KiwiRS4T]

lol idiot!

Would you care to elaborate?