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try this
1 find out what pressure you are running stock.
2 install the return fuel line
3 put a nedle valve between the rail and the return line
4 install a high pressure fuel pump
5 adjust the fuel pressure to the stock level, using the valve. this way the pressure will never change!!!

now here comes the trickey part. you will need a fuel pressure reg made for boost. ex vortech SFMU. i has to be adjustable. because it is made for high pressure on our 6 gen civics. and no telling what it will be set like from the factory. if you are short on cash just get a a/f and adjust it going down the road. you will have to stop each time to change the settings.

how does that all sound!!

 
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sounds like it could work, but then again... I wouldn't know. You should tell HKS about that one.

 
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Hrmm... in theory maybe. Gotta remember the stock ECU is setup for constant pressure, you will aslo need to upgrade the injectors.

 
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and the fuel lines and rail, it could work, you have to trick the ECU into thinking the engine is running really lean all the time, then it would deliver the fuel needed, a piggyback should be able to do it.

 
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<< and the fuel lines and rail, it could work, you have to trick the ECU into thinking the engine is running really lean all the time, then it would deliver the fuel needed, a piggyback should be able to do it. >>



No No!
look back at what i said. you add a fuel management unit that increase fuel pressure under boost. when you start boosting your fuel pressure will increase, and there for increasing fuel flow through the injectors. no need for any piggy back or stand alone fuel management unit. it does it all.

 
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<< try this
1 find out what pressure you are running stock.
2 install the return fuel line
3 put a nedle valve between the rail and the return line
4 install a high pressure fuel pump
5 adjust the fuel pressure to the stock level, using the valve. this way the pressure will never change!!!

now here comes the trickey part. you will need a fuel pressure reg made for boost. ex vortech SFMU. i has to be adjustable. because it is made for high pressure on our 6 gen civics. and no telling what it will be set like from the factory. if you are short on cash just get a a/f and adjust it going down the road. you will have to stop each time to change the settings. >>



this is basicall what my local tuner is planning to do with my custom turbo civic application too.

here's what he said he's going do:

The FMU I would use on your car is a Bell unit that allows to set the base fuel pressure as well as the stepping ratio (rate of gain) for the fuel pressure from 2:1 up to 11:1. This allows us to fine tune the fuel requirements for your particular application. In addition we can also set the maximum fuel pressure so as not to strain the injectors to much. This is used in conjunction with the fuel return hose to provide all the additional fuel requirements your vehicle will need for safe boost. It will also require a better fuel pump.