As of now I'm using the stage 1 setting with KN filter direct on TB & high flow full exhaust system.
Yesterday I played around going +1 on the red (WOT) to see if it could rip a little more power when WOT.
Results=inconclusive thus far
Ok after a good run I'm using 6,5.5,5.53,4,4.5! Seem to be tuning good around 13.7/8 on full , the did have figure 17.1 going down at 76 mph ? This is my first time at tuning so not to shore I've I'm doing right but the bike feels really good !
So, I have an update for the EJK users. After much deliberation with the tech that actually developed the EJK for the Grom, I have to make some corrections to an earlier post of mine. I apologize for any confusion this may have caused; I take full responsibility for the error.
According to the tech that developed the program for the EJK, the Grom is in a closed loop fuel map when it is at a steady throttle or light engine load. Any time you touch the throttle, it is going into an open looped fuel map.
I stated before that if you adjusted the 4[SUP]th[/SUP] (green/blue) VC offset mode, you would most likely need to adjust the first three modes as well. This information was wrong. The 4[SUP]th[/SUP] (green/blue) mode will adjust your fueling during steady throttle/light engine load. The only mode you may have to adjust after adjusting the 4[SUP]th[/SUP] (green/blue) mode, would be the 1[SUP]st[/SUP] (green) mode.
The 4[SUP]th[/SUP] (green/blue) mode’s base setting is 3.5. At 3.5, you should see an AFR of 13-13.5 while cruising above 4000 RPM’s. If you adjust the 4[SUP]th[/SUP] (green/blue) mode to the left, you will be pulling fuel. If you adjust it to the right, you are adding fuel.
The 2[SUP]nd[/SUP] (yellow) and 3[SUP]rd[/SUP] (red) modes are adjusting the fuel while in open loop.
Another tuning option for the Grom would be to disconnect the EJK O2 harness and leave the stock O2 sensor connected, the bike will run its stock closed loop fuel map during cruise. The EJK will still work, but you will not have the ability to tune the 4th (green/blue) mode. If you decide to make this adjustment, we recommend you start out with your 1[SUP]st[/SUP] (green) mode set at 5. You will still be able to tune your hard acceleration and WOT.
Please let me know if there are any questions. Again, I apologize for the misinformation in the previous post.
Open loop simply means there is no feedback of the result to the ECU. In our case, it means there is no sensing or measuring of the exhaust gas to see how the bike is running. The fuel injected is determined by the RPM and throttle position, derived from fuel injector pulse width numbers stored in the fuel maps, and is trimmed for environmental conditions due to air temperature, air pressure and engine temperature. Closed Loop
Closed loop means there is feedback of the result to the ECU. In our case, it means there is sensing or measuring of the exhaust gas to see how the bike is running. This sensing is done by a probe (a galvanic cell) which generates a voltage based on the gas around it. These probes are referred to as Oxygen sensors, Lambda sensors, O2 sensors, Exhaust Gas sensors and probably a few other names as well. I’ll call it a Lambda sensor. Why Lambda you ask?
right now im running with out o2 offset connected (stock o2). and its fair.
With o2 offset wire connected ran this
from my experience running the red zone below 5 was very lean 15-17 a/f, it might seem that the bike is faster but its actually running really lean.. if you keep the red 5 and above you should be fine .... this is on my bike/mods and your a/f might vary .
Well it got up to 50 degrees yesterday and I was able to take the Grom out and do a little playing with the settings, these seem good so far. I plan on doing more once its starts to get warmer.
So far I G6, Y5.5, R5.5, GB3, YB4, RB4.5