I hear from few people that on rst , on eaternig unit (somewhere near CO screw) has black screw for adjut fuel pressure?

 

yes

The black box on the side of the metering unit.

Take that off, and there is a flat head screw which is a cap. UNder that is a 2mm allen key for adjusting the pressure. It is VERY VERY VERY sensitive. Don't turn more than 1/8 of a turn at a time. Clockwise to richen.

 

The RST has an adjuster inside the electromagnetic fuel pressure actuator (behind a blanking screw. The adjuster is an allen key) on the side of the metering unit which affects full throttle enrichment. I would leave this one alone unless you know what you are doing with it as it will affect your on boost fueling and melt your engine if you go the wrong way. You will need an aif to fuel monitor (wide band lambda sensor).

It also has a base fuel pressure adjuster inside the fuel pressure regulator. You have to remove the fuel return pipe to get to it and you need an allen key to adjust it. Base fuel pressure setting is 5.7 to 6 BAR.

 

Be careful when undoing the screws of the black box (pressure actuator). The whole system is under fuel pressure which will be released when you untighten them. There might be some petrol spray. Then remove the actuator but don't loose the two small green gaskets at the back of it.

Oh, and better use a good screw driver for the flat head screw on the back of the unit. It usually sits very tight and is made from weak metal.

 

thanks on advices. It seems to be complicated without lambda. I will take it to somone with WB lambda.

but when I see screw for adjusting fuel pressure, I must only turn it or must doing something with "fuel back to tank"?

thanks mates

 

Isnt it best left a tuner who knows whats hes doing