installed an F2 fuel controller last week. this controller comes with stock programing that is preprogrammed for a freer flowing airfilter and an aftermarket exhaust.
so i just pluged it in and off i go.. everything is working fine has a little more power from bottom to top end..
my question is what is going on inside this little box? how does it work?
what are the little lights on the programmer tell you?
when i am at idle it has 1 GREEN light...you apply gas and revs go up i get 2 GREEN lights.....as revs increase the lights change to RED and i get 3 or more of these RED lights.what is this telling me? thanks MUDD

they modify the pulse width to the injectors for more or less fuel than stock......

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2006 silverado 2500 hd
2006 additude toy hauler
2008 polaris rzr
2006 suzuki ltr450
2005 kawisaki kfx700
2003 suzuki z400
2003 honda ex250

what are the red and green lights for?
should they stay green or is changing to red ok?

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GEN 2; 2 INCH RUBBERDOWN LIFT;28x12x12 Maxxis `ZILLA tires on rear and 28x10x12 Maxxis `ZILLA tires on front;ITP TYPE 4 ALUMINUM OFFSET RIMS;GIBSON FULL SS EXHAUST;DFR/CYCLONE AIR FILTER SYSTEM;F2 FUEL CONTROLLER;CLUTCH SPACER REMOVED;3500LB GORILLA WINCH;POLARIS FRONT BRUSH GUARD WITH FOG LITES;POLARIS BIKIMI TOP; HALF WINDSHIELD;GOODYEAR GATERBACK SPORT BELT....

what do the instructions say, red is normally not a good sign.

Can someone post the instructions on these boxes, I would like to know also what they mean.

their are so many out their and most have some fore of indicators i have the dyno jet one it has a row of led's they represent the tps opening and wile adjusting the amoutn of fuel added or subtracted i also can down load new maps with a computer and change them also you can modify the map with the computer program in alot mor smaller increments... as to the lights on yours read the manul if you dont have it id goto the manuf web site and see if the have it online they probaly are telling you when they add or subtract fule but thats my guess....

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2006 silverado 2500 hd
2006 additude toy hauler
2008 polaris rzr
2006 suzuki ltr450
2005 kawisaki kfx700
2003 suzuki z400
2003 honda ex250

Ok so what does the reprogramed ECU do with or with out a fuel controller? Sorry for the tread hyjack. Let me know I'll move it if you want Mudwiser

Injectors don't simply turn on and shoot a bunch of gas into the cylinder. They are a simple on/off valve that is controlled (varied, modulated) by pulsing the control voltage. This is Pulse Width Modulation. The longer the ON portions of the pulses, the more fuel spits out. The factory ECU computer takes the input from the Throttle Position Sensor and responds by pulsing the injectors in response to a pre-programmed "fuel map". An EFI piggyback controller modifies that map to give you much more control over the entire power range than you could ever achieve with jet changes in a carburetor.

An aftermarket EFI controller is inserted inline to the Throttle Position Sensor and injector cables. It uses the TPS signal so it "knows" what you want--more or less power. It then intercepts the factory ECU output signal to the injectors and substitutes its own, modified, signal. YOU program the modifications to the factory ECU injector commands via pushbuttons on the black box or by pc via USB port.

Piggyback EFI controllers only affect fuel delivery. They don't change ignition timing. For that you need a reprogrammed ECU or an add-on CDI box.

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Now a 2-Rzr household.
Romeo, MI
http://tinyurl.com/8ltm8
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Great explanation. The first one out of many I've read that I understand. THANKS!

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05 Rhino......GONE
09 rzr-S x2 and LOVIN EM
07 GT500 Shelby
ssgt. 1stSFG LIVE FREE OR DIE

X2 thanks fopr clearing it up in my mind. Now another question. How do you know What spots up want to add and take fuel away with the fuel control? Is it seat of the pants or do you get a base line to start with? I would think you have to still read plugs and wash right?

See if I get this. There are baselines for stock. To be spot on I think you need the control module to show you what your air/fuel ratio is at different engine speeds. (RPM) Or you can cheat and go to a programmers web site and see if they have maps matching your mods for optimum performance.

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05 Rhino......GONE
09 rzr-S x2 and LOVIN EM
07 GT500 Shelby
ssgt. 1stSFG LIVE FREE OR DIE

Creating a custom fuel map with a programmable controller. From worst to best (just my opinion and not really even based on personal experience):

Seat of the pants.
Plug reads.
What your buddy is using.
Download a map from someone with similar setup (UTV offroad created a custom map for each system they tested in their exhaust shootout & they promised to make these available for download--great if you have an otherwise stock Rzr and a Power Commander controller)

Best method is to spend some money at a reputable dyno shop that knows how to tune a UTV for YOUR needs. Too many dyno techs know only to tune for peak HP and that isn't necessarily what you are after in a trail machine.

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Now a 2-Rzr household.
Romeo, MI
http://tinyurl.com/8ltm8
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Something else u can change is fuel pressure or injector size. It will also increase fuel consumpsion.

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Dothan, Alabama

2008 rzr,2 2008 honda 420 rancher 4x4,2008 250 recon, 2003 350 rancher 2x4, 2002 Hayabusa

Guy48065's was a good explanation of the way they work.
I would add to the best method option:
spending the money and buying a wideband AFR gauge (air/fuel ratio) and tuning the vehicle yourself in real world situations.

I agree (forgot to add).
Anyone know if a hand-held version with a tailpipe "sniffer" is reliable and accurate?

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Now a 2-Rzr household.
Romeo, MI
http://tinyurl.com/8ltm8
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