Fuel control for mildly modded S5
06-09-08, 02:58 PM
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Fuel control for mildly modded S5
Also psted in n/a Tech...
Just bought a nice S5 na and looking to control the fuel better.
Mods:
Streetport & 3rd gen housings
Full Rb exhaust
6-ports work with stock air pump
Cold air intake
Injectors recently cleaned & balanced
Walbro 255
Car has a slight cold-start hesitation; previous owner said it started with the Walbo installation. It stinks like gas right after startup. Otherwise car is quick & drives great. I’m sure the car is running a bit rich due to mods, hi-pressure pump, and Mazda’s overly-conservative stock mapping.
I’d like to better control the fuel & lean it out for easy starting, drivability, and optimum power.
Popular options seem to be a SAFC or Rtek 7 with the ECU fuel curve mapping. Any others?
I plan to install a wideband. Aftermarket ecu (Haltech etc) is not an option at this point, I do not plan to do much more modification.
Searching the forums revealed various owners go either way. Just wanted some feedback, thanks…
Just bought a nice S5 na and looking to control the fuel better.
Mods:
Streetport & 3rd gen housings
Full Rb exhaust
6-ports work with stock air pump
Cold air intake
Injectors recently cleaned & balanced
Walbro 255
Car has a slight cold-start hesitation; previous owner said it started with the Walbo installation. It stinks like gas right after startup. Otherwise car is quick & drives great. I’m sure the car is running a bit rich due to mods, hi-pressure pump, and Mazda’s overly-conservative stock mapping.
I’d like to better control the fuel & lean it out for easy starting, drivability, and optimum power.
Popular options seem to be a SAFC or Rtek 7 with the ECU fuel curve mapping. Any others?
I plan to install a wideband. Aftermarket ecu (Haltech etc) is not an option at this point, I do not plan to do much more modification.
Searching the forums revealed various owners go either way. Just wanted some feedback, thanks…
06-09-08, 07:37 PM
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personally I would go with an AFC neo and a wideband for simplicity... but that doesn't give you any ignition control... if you have a good laptop a greddy emanage would control fuel & ignition.
06-09-08, 10:54 PM
#3
Rtek 2.1 . I wouldn't go with an SAFC now that there are better options. And I certainly wouldn't go with an AFC Neo. Better off saving a couple hundred bucks and get an old SAFC 1. I promise it won't make a real difference, certainly not an extra $300 worth for a color display and higher resolution adjustments.
You can control fuel, timing, auxilary ports, VDI, and on the s4 cars at least you can control startup fuel curve to prevent flooding. SAFC can't do any of that. I wish it was available back when I was modding my nonturbo car.
If I were you I would put a stock fuel pump (or a T2 fuel pump) back in to the car, the 255 is just going to raise your fuel pressure and make it run worse. You don't need that kind of fuel flow for an n/a car. FD pump is the biggest I would run, and even that is pointless over a T2 pump.
You can control fuel, timing, auxilary ports, VDI, and on the s4 cars at least you can control startup fuel curve to prevent flooding. SAFC can't do any of that. I wish it was available back when I was modding my nonturbo car.
If I were you I would put a stock fuel pump (or a T2 fuel pump) back in to the car, the 255 is just going to raise your fuel pressure and make it run worse. You don't need that kind of fuel flow for an n/a car. FD pump is the biggest I would run, and even that is pointless over a T2 pump.
06-10-08, 07:35 AM
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Cool thanks
I am looking closely at the Rtek7 Stage 2, Not sure I would really benefit from timing control, as the modifications are pretty mild, but the Stage 2 sure looks nice.
Getting rid of the OMP and the AWS would be a bonus.
Teh SAFC looked good because its cheap (about $100 used), installation is easy & clean, and I think it'll do 80% of what I want.
Thansk arghx for suggestion of fuel pump - validated what I was thinking. Back to a stocker I go, which I hear can supply enough fuel for over 200hp anyway.
I am looking closely at the Rtek7 Stage 2, Not sure I would really benefit from timing control, as the modifications are pretty mild, but the Stage 2 sure looks nice.
Getting rid of the OMP and the AWS would be a bonus.
Teh SAFC looked good because its cheap (about $100 used), installation is easy & clean, and I think it'll do 80% of what I want.
Thansk arghx for suggestion of fuel pump - validated what I was thinking. Back to a stocker I go, which I hear can supply enough fuel for over 200hp anyway.
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