Free unrestricted maps for Rocket R GT and TFC now online

dougl said:

What year is your Rocket? Is it stock? Have you ever had a bike dyno tuned? Why do you want to modify the tune?

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2024 all stock. I've worked on Delphi systems in the past. I want to reduce city heat, improve fuel economy at cruise speeds (not the same as reducing emissions) and unlock more torque and power when I get on it. But I want to understand how it works rather than just copy someone else's tune blindly

Penner said:

Maybe we have a misuderstanding. The value in the AFR-map even in the closed loop area is not part of the fuel calculation. There is no 10% increase in fuel if you change target from 14.5 to 13.1.
That is different from the Delphi ECU where AFR tables are part of the calculation even outside of closed loop.

Yes, that is pretty much it. It is like an on/off switch. The stock O2 sensor is great at 14.5 AFR, but pretty blind to anything outside of it. There it can just read too rich or too lean, but has no idea of how much. If AFR is set to 14.5 and O2 sensor reading is off it will simply start to inject more or less fuel until it has reached the sweet point of 14.5.

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First, are not the values in the fuel tables mg of air? Next, if you disconnect the O2 sensors, suppress the error codes and reset the adaptions, how is fuel calculated in the area of the AFR table with 14.5?

nullpointer said:

2024 all stock. I've worked on Delphi systems in the past. I want to reduce city heat, improve fuel economy at cruise speeds (not the same as reducing emissions) and unlock more torque and power when I get on it. But I want to understand how it works rather than just copy someone else's tune blindly

Click to expand...

Does your experience tell you that leaning out the mixture tends to make it run hotter? You can increase your maximum torque a crapload simply by setting the values in the ETV3 table to 100 at 100% grip throttle, as Penner has done.

Penner said:

Maybe we have a misuderstanding. The value in the AFR-map even in the closed loop area is not part of the fuel calculation. There is no 10% increase in fuel if you change target from 14.5 to 13.1.
That is different from the Delphi ECU where AFR tables are part of the calculation even outside of closed loop.

Yes, that is pretty much it. It is like an on/off switch. The stock O2 sensor is great at 14.5 AFR, but pretty blind to anything outside of it. There it can just read too rich or too lean, but has no idea of how much. If AFR is set to 14.5 and O2 sensor reading is off it will simply start to inject more or less fuel until it has reached the sweet point of 14.5.

Click to expand...

So how do we richen up the AFR for more power ? Do we need to ? I have opened my ETV to the percentage in the colums after 20% throttle. What else can be done for more power ?

dougl said:

First, are not the values in the fuel tables mg of air? Next, if you disconnect the O2 sensors, suppress the error codes and reset the adaptions, how is fuel calculated in the area of the AFR table with 14.5?

Click to expand...

Ah sorry, now I got you.
Yes, when the ECU is first programmed, calculated values are used for the fuel injection. The amount of air in the cylinder is determined, and then the fuel quantity is calculated according to the desired AFR value. That’s enough to get the engine running reasonably well, but it’s not yet ideal in many respects. After that, you do what every tuner does and tune the engine using O2 sensors so that it achieves exactly the desired AFR value. You then have the exact amount of fuel for every throttle opening and engine speed. These values are fixed in the F-tables. It doesn’t matter whether the tables use cfm, fuel quantity or another unit. Any number in there is directly corresponding to the necessary amount of fuel. The Keihin ECU uses solely this data to calculate the injection duration in milliseconds. Unlike other control units, the AFR map is not part of the calculation in the Keihin ECU. Delphi and Bosch ECUs are programmed to include the AFR map as an additional factor, so that changes in the AFR table have a direct influence on the injection quantity. Keihin does not do this.