paulzy

iTrader: (1)

What has everybody done to counter the returnless fuel system in the new hondas and acuras?

Tony, I know you've done this so you better answer or I'm not gonna give you my autograph

Sonny

I saw an article on a turbo Miata that was faced with this same situation (I don't remember where...sorry). Basically what they had to do was figure out how to counteract the fact that the fuel pressure stays constant even as manifold pressure rises.

They basically had to run artificially high duty cycles to compensate.

Sonny

ahobbs

I believe the guy on here is turboD17 that has a returnless fuel setup. Tony did his I believe.

paulzy

iTrader: (1)

ttt

Turbo D17

Tap the fuel rail, use an additional injector controlled by a Haltech F5.

Works perfectly on my setup (01 Civic EX with t3/4b at 8psi).

paulzy

iTrader: (1)

you talking about tapping the rail to add a return line? or for the 5th injector?

tony1

Just tap into the fuel feed for the additional injector. That setup worked perfect for scott's car!

LshatchTurbo

RSX's also have returnless fuel systems correct? If so, greddy has recently release a kit for the RSX. In a back issue of Sport Compact Car, the greddy RSX was running a E-manage system to control the fuel timing etc...running 440cc injectors. Now are these RSX kits shipping with pre-programmed E-manage units, or just a variation of the FCU that came with all the other greddy kits?

SIXTYdashONE

Im awfully confused on how this would work, can someone further explain this injector method?

Flamenco-T

I am freakign confused, I mean, the fuel has to go somewhere though,...

or do we mean by FPR less setups ?

stan

DeepSi

so is the extra injector used to spray the remains of the fuel, so there wont be any gas to return? Are there FPRs?

Turbo D17

The extra injector supplements the 4 stock injectors... adding only what fuel is required for boost. When out of boost, the additional injector does not fire, and only the stock 4 injectors fire.

There is a fuel pressure regulator of sorts... when it senses a pressure drop on the rail, it tells the pump to flow more. You can actually see the momentary pressure drop when I go into boost on my fuel pressure gauge. When pressure starts to build (letting off the gas pedal) it tells the pump to slow back down.

LshatchTurbo

this is a interesting discussion just cause i am curious about it. Now would you ever want to use one of these bad boys, DIGITAL FMU :

http://216.242.145.16/products/product.phtml?p=32