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Hours of Operation
TUES 10AM-7PM
WED 10AM-7PM
THUR 10AM-7PM
FRI 10AM-7PM
SAT 9AM-5PM
SUN CLOSED
MON CLOSED 
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The R259 Fuel Controller is available for "ALL OILHEADS". The FN-1033WD works on all R1100R, R1100RT, R1100GS, R1100RS.
The FN-1032 is for R1150R, R1150RT,R1150GS, R1150RS, R1100S,R1200C and R1200CL series.
The cost of the R259 Fuel Controller is$249.95 plus $10.00 shipping and handling. You may order it online or if you wish, feel free to call us at (301)948-4581.
| How the stock system works:
The fuel injection systems used by BMW utilizes an oxygen sensor in the exhaust stream to feed back data to the ECU and is termed as a closed loop system. The main fueling data is extracted from a map, a two dimensional array based on rpm & throttle position. These two inputs are used by the ECU to determine the load on the engine. An added 3rd dimension contains modifying data for barometric pressure, engine and intake air temperature and the oxygen sensor inputs. This system is always in one of its two modes of operation, open loop or closed loop.
Why two modes? It is assumed that the vehicle will be operated most if the time under light accleration or steady cruise conditions, and these are the parameters that set closed loop operation. In this mode, the oxygen sensor data becomes the primary modifier for fueling. This sensor measures the amount of residual oxygen in the exhaust stream, as this O2 level must be kept within a specific range to keep the catalytic converter functioning efficiently. This closed loop mode is intended to keep emissions low. Grab a handfulof throttle and you're in open loop mode. Any mid to high load situations cause a shift to open loop mode. In this mode the fueling data comes from the map, and the oxygen sensor is ignored.
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What we learned in our testing
1. The open loop systems are borderline lean.
2. The closed loop systems are very lean and are most certainly the cause of the surging.
3. No two bike tested operated exactly the same. There were no consistent loop state parameters.
4. When in closed loop all the ECUs had the ability to pull out any fuel we added with an 83I or TFI1030.
5. Some bikes we tested were leaner than others and still had no complaints of surging. Riding styles are a factor. Aggressive riders spend less time in closed loop mode.
6. Cat Code Plug testing proved to be completely inconsistent,
7. Defaulting the systems by unplugging the O2 sensor (forcing open loop) had mixed results. M2.4 defaults to a lean flat map that works well with a TFI1030 Earlier models were inconsistent.
Our goal was to develop a stand-alone product, that would reduce or even eliminate surging, and with enough latitude in its adjustments to compensate for performance upgrades to the bike.
First we needed to develop communication and control protocols to add fuel in closed loop mode. Without this there would be no fix at all. Next we would integrate this technology into the TFI 1030 to enhance fueling in open loop. Finally, the hardware would be designed to provide a stable user interface, and support future software upgrades. Two years later, here we are. |
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How the Techlusion R259 works:
The R259 is a modified version of the TFI 1030. The 1030 is a digital post ECU fuel adder with three fuel circuits. We call them by LED color with green being the low speed, used to control fuel for any cruise that occurs in open loop, the yellow is a load sensing accleration fuel circuit and red which which topside or main jet fuel Each circuit has a potentiometer, next to its LED, that controls the amount of fuel added in that circuit. It differs from the 1030 in that the rpm transition adjustment for the red fuel has been eliminated and this value is now controlled in the software. The remaining pot adjusts the closed loop add circuit. It also has a green LED that is mounted nearer the center of the board. Anytime a LED is on means that particular fuel circuit is active. Adjustment is easy, as this device will only ADD fuel. In closed loop the R259 tells the ECU, through the oxygen sensor input, that the current mixture is too lean. The ECU responds by adding fuel until specific parameters are met. At this point the R259 breaks off communication with the ECU and the ECU begins to lean the mixture. Once the parameter boundaries are crossed again, The R259 communicates to the ECU to add fuel...As Mark Dobeck, President of Techlusion Performance Group puts it," we have closed the loop on the closed loop".
At any rpm below 1500, the system functions as completely stock.
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Application:
The Techlusion R259 has been designed to function as a stand- alone device, on absolutely stock BMW fuel injection systems. We do not recommend the use of this controller with any other fuel system controls or modications. The device requires a working oxygen sensor to function. The Techlusion R259 will be shipped with a pre-built wiring harness with OEM connectors. The recommended mounting location is the right front corner of the airbox lid. The harness connects to the right fuel injector and the oxygen sensor connector, and a single lead to the battery ground. On most models the oxygen sensor connector is under the fuel tank.
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The Downside:
Properly adjusted, the device should alleviate most (if not all) of of the surging below 55 mph. You may experience a slight increase in high speed surging during cold weather operation. Holding the engine speed above 1500 rpm with no load (free revs) should be avoided. The cold start "high idle" should be set just below 1500 rpm.
A word about catalytic converters and exhausts:
When we started down this road, we all believed that overfueling a catalyzed engine would result in a severe overheating of the catalyzer. As we learned, this is not true. We found that by richening the mixture we decrease the residual oxygen in the exhaust. This oxygen is the fuel for the catalyst and without oxygen, the catalyzer simply shuts down. Primarily catalyzer over-heating is evidence by an engine misfire, where the fuel air charge is pumped, unburned, into the exhaust system. Removing the catalytic converter, by installing an aftermarket exhaust system, will not affect the function of the fuel injection system. However, the dynamics of the aftermarket exhaust will affect the fueling requirements of the engine. The R259 has more than enough tune-ability to handle the fueling requirements of any quality exhaust system you choose. |
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