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I know youīre all gonna flame me but ive searched and couldnīd find an anwser.... what the f#ck does a Returnless Fuel System do??? Why is the so much trouble with them??? Why canīt you add a turbo???

 
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do a better search

 
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not 100% sure but from my understanding, you could let the fuel flow at a high rate that is needed with a turbo. when the turbo doesn't kick in and doesn't require more fuel, the fuel return will return the unused fuel back in the fuel tank...

since we have a returnless system, we could probably tune our cars for turbo but when it doesn't kick in we are left with all that fuel that has no where to go since we dont have a fuel return.

i dont know jack about turbos or any engine mod tho so dont quote me on this, still have alot of learning to do myself.

 
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But what is a returnless fuel system.......

 
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Alright guy...just think about it: On a regular fuel injection system, there are 2 fuel lines; one going to the fuel rail/pressure regulator to supply fuel to the injectors and another one to scavenge leftover fuel from the fuel rail and return it to the tank.

On our cars, there is more precise metering and atomization of the fuel so as to promote better burn efficiency and eliminate leftover fuel, hence the return line is not needed.
This is what is meant by a "returnless fuel system". Hope this is clear now.

 
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thanks..... i never got on awser on that question before.............................

 
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props 2k1 dood, you are a good guy to have around..

 
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Ummm, actually, the returnless system does not optimize fuel etc. It is only there for emissions purposes. Fuel that is brought to the engine bay is heated up, then when that leftover fuel is returned to the fuel tank, it heats up the rest of the gas and causes vapor. Vapor through the engine causes hydrocarbons, the source of a stinking tailpipe (high emissions). The returnless fuel system is not more precise when it comes to fueling, it is more of a crude system, but it is cheaper to build, has lower emissions, and is easier to service on (ie. diagnose a problem and fix).

 
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WTF are u talking about? I never said the lack of a return fuel line optimized the fuel system...at least KNOW what you are talking about. The ECU in our cars works in conjunction with the VTEC-E system and the redesigned injectors to aid in a more efficient burning of the fuel delivered into the cylinder. If you want to get technical then, yes, the fuel line itself plays a role, as the in-tank fuel pump's output is regulated and varied according to the engine's needs...this is why there is no return fuel line and why it's called a returnless fuel system. Again, this single fuel line system is made possible by better injector nozzles, ECU fuel maps, and VTEC-E actuation of the intake valves and the resulting optimized fuel supply and usage.

 
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Good lord, get all hyped up. My mistake man, just misread your post. LOL, calm down. BTW nice pic


EDIT: WTF. Know what the hell I am talking about. Dear god, thats why I mostly just float on this site. Your not going to turn into another PinkyToe incident now are you? Don't worry about replying with some hyped up attitude, Ill just continue to float because its not worth it to argue. If you truly know about cars, then props to ya, seriously, but if your another one of these dumbarses that just read over stuff on the net and then think you know it all, blow me.

 
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Dude, our returnless fuel systems still provides more than enough fuel and pressure to accomodate a turbo or nitrous. If you are interested in having it done for you, www.openloopmotorsports.com
It'll run you about 4k installed.

- Fa5ter