I'm gathering parts for a trubo on a d17, but they have that new stupid returnless fuel system, any suggestion on how to make it the normal return or what system to use to keep the returnless, i.e. will hondata hookup to the returnless or get hondata and a return fuel system.

 

You don't need anyhing for a Fuel Return line with turbo.

 

what the **** does that mean?

 

it means...
you don't hook up your turbo with fuel line...

 

Hey pal, I was just trying to help you out and you say that kind of stuff?

Grow up son. Take your a$$ back to Superhonda.

 

Check https://honda-tech.com/zerothread?id=328742

He used a haltech computer to run 1 extra injector before the throttle body... 200 whp at 8psi. Great results I'd say.

 

He was just asking how you setup your fuel system when there is no return line on the 01 civic. Does it matter that there is no return line? Can you still do your conventional bigger injectors and hondata?

 

The returnless fuel setup isnt too bad if you arent going all out. You can leave it stock if you stay reasonable with the boost. There are a few new turbo Civics around my area with the returnless setup and they seem to run pretty well. Just cant use an FMU or any kind of fuel pressure regulator to adjust fuel pressure.

 

Hmmm...too much friction around here these days.

Anyways, back to the question (which is a valid question since most new cars come with a returnless fuel setup these days). A returnless fuel setup has the disadvantage of running a CONSTANT fuel pressure. So there's no way to increase fuel pressure to compensate for the additional O2 from a turbo or any FI applications.

But there a few options. Convert back to the old system with return line and regulator. But remember that your ECU will assume that fuel pressure is at a constant, so tuning can get a little tricky. Or your other option is an AIC, additional injector controller, which can be set to add more fuel under boost or a certain rpm. (Easier option)

With more cars coming out with this type fuel system setup, we have to be ready to address this issue. So to the guys that say the fuel line doesn't hook up to the turbo, you are WAYYY behind on times.

 

Theres another thing to think about when you change the fuel system from a returnless style to a return style. There might be a sensor that detects pressure in the fuel tank, when you add a return line it might cause the sensor to throw a code. This is the case with my car and why i need to go standalone if i wanna progress any further

 

It's always worth it to go standalone. I've gone from FMU --> AFC Hack --> Hondata.
I know it gets tiresome to hear everyone preach about how there is no substitution for tuning, and standalones are the way to go, especially if you only have xxx dollars and that's all you want to or can spend... Trust me though, save the money and just get the standalone. Whether it's AEM, hondata, anything, it is so worth it in the long run.

 

ok, I'll clear this up. I know you don't put a fuel line into the turbo, i knew that, sorry for the confussion. I want a standalone but how does that work with the returnless? would i need the extra injector or could i get the standalone and do something else with the injectors? and if i went with hondata, would i have to make it the return style or could i stane with returnless, so basicly would hondata work with returnless?

 

you best bet is to wait for a standalone system to be developed for your car.

running the extra injector setup is going to be just as costly and its still a hack in my eyes.

 

So using larger injectors is of no use if the fuel pressure cant be increased?

 

larger injectors and standalone will work just fine with returnless system but since the FP won't rise with the manifold pressure, you should probably go a size larger injector than you normally would (ie 550s instead of 440s or 720s instead of 550s) since at max boost they'll flow less than they would with a 1:1 fpr setup.

This will become a bigger problem as boost rises - if you're at 30 psi boost and the fuel pressure is only 40 psi (for example) your injectors are only going to have 10psi equivalent fuel pressure and you'll lean out like a sumbitch

 

suuuumbich!

 

Tony1 from jotech just made a turbo kit. He added the additional injector controller(AIC) MF2 and made 197whp on 8psi. I saw the dyno and was very impressed. contact him about it.

art