My LS/Vtec coversion runs so lean I'm afraid of driving it and can not find problem that causes such A/F ratio.

My setup is
B18B block
B16A head
P30 ECU
B16A Intake manifold

I wonder if someone could give me sum clues what can I do to increase A/F reachness. Can it be problem with ECU, so I hould use 1,8 VTEC ECU?

 

what model car are you running this in?

did you change out the fuel line that goes to the fuelrail? or what about the intank fuel pump?

 

I'm driving '94 LS teg and I'm using LS fuel pump. Fuel line seems to be fine.

 

Your best bet for accurate fueling would be a Type R ecu, as that is a 1.8L engine with a modified b16 head and manifold.

However, you'll probably want to either have your current ECU reprogrammed or switch to some sort of programmable engine management. Because your car is an OBD1 vehicle, I would recommend Hondata.

 

you need more fuel h:

 

I checked O2 sensr and it was dead. I replaced it with new one and car runs better, but still header temperature is to high and spark plugs are too grey, so I think the A/F is still too lean. On Monday I will be able to measure A/F, but it seems that O2 sensor was not the major reason for he problem.

What Can I do else?

 

The only way you can add fuel relatively inexpensively is by using an adjustable fuel pressure regulator and increasing the pressure. Beyond that you'll need a V-AFC or other fuel management.