The dual rail kit is a great way to tune with a SMT or some other piggyback. The dual rail is basically a second fuel rail built in after the stock fuel rail. It is controlled by a SMT6, in my case, and will be good for adding fuel, and the ECU cannot lean out anything.
The stock rail will be put back in place, along with the stock FPR and return line. The second fuel rail is sliced in to the fuel feed and fuel return line. The injectors are hooked up to a MAP sensor and the SMT, and tuning is done from there. Here are a few shots from the prototype and another members car on RD:
SMT6 will be hooked up to the secondary fuel rail, as well as the ECU to control timing, watch engine temperatures, and read narrowband off the first O2 sensor.
No, since I have MAF on my car and I am running larger injectors then stock, the ECU will lean out any settings entered in via a fuel tuning hardware. The secondary fuel rail runs the larger injectors while the primary fuel rail runs the stockers. This allows me to add as much fuel as I want to, and the ECU will be happy doing its own thing.
Amen. I have a MAF as well I sure don’t need 8 injectors.
Its called an SAFC (i’m going to guess its less of a headache then trying to tune with two different sets of injectors). Allthough i do like the extension between the head and manifold, for a little more turbulence.
How is it gay? Since its a friggin Hyundai and there is no company out there yet to crack the ECU, its the simplist way around the ECU leaning out everything.
There is a guy with a similar setup with a Supra… but its definatly different. He has 2 rails, 12 injectors. 6 primary injectors are 1000cc injectors running 94 octane for driving around easy, when he gives it over 85% throttle, it shuts off the primarys and opens the 1600cc secondarys with a seperate fuel cell in the trunk filled with VP Import. So he never ever has to change gas to race… this is with the AEM EMS by the way. Nice setup to get 20mpg, then 1500rwhp without draining the fuel out of the car.
Hahn Racecraft has something like that. It’s called a portfueler. Uses secondary injectors for when the car gets deep into boost to a point where the primaries can’t supply enuff fuel.
SMT-6 with a dual rail tuned to kick in for boost has been shown to eliminate the ECU leaning out the tune and you can supposidly adjust timing with the SMT-6. BUT no the great thing about running dual rail is that you get to keep your stock rail with the ECU tuning the trim by itself when off boost or say under a certain % throttle or at a certain RPM, meaning you get to keep your low speed tune and DD and idle arent affected. if you were to go single rail with larger injectors you would have to tune on low rpms so that your not getting too much fuel at idle/cruise.
