OK, so I've been riding around on the bike for a couple of days, including a few hours of more technical riding (around a mini race track).
The mod really works, the bike is definitely smoother and more pleasant to ride.
Now that I've read a few of your explanations and also felt the difference with and without the mod, I've got a question.
Is there any need at all for the closed loop stage, from a riders perspective (putting aside environment protection)?
It seems to me that if we could set the bike to only used the open loop map, everything would be better and smoother.
From what I understood your controller modifies the O2 sensor's square wave output, in order to show a leaner mixture, which causes the ECU to inject a richer mixture which is close to the open loop mixture. This is great as it's a plug and play solution, which doesn't require any modification to the ECU.
Assuming we could re-flash the ECU software such that it never consults the closed loop, rather it always uses the open loop wouldn't we be better off?
I reflash the KTM 990 ECU's myself & turn off the closed loop so it can be done, one thing we have found on the KTM's when turning off the closed loop is it affects the L trim tables at different altitudes when the engine load changes, the ECU uses the O2 sensor voltage not only for closed loop mapping but for the L trim calculations for altitude compensation & air density, F trims are TPS/RPM inputs & L trims are intake vacuum /RPM inputs, the F/L trim switch's between each other constantly depending on the TPS, engine load & RPM range, to compensate for this problem I reflash the 990 with a lowered F/L switch points so the ECU is forced to run only in the open loop from 2% upwards, below that it I still use the intake manifold vacuum inputs for better idle control, this solution seems to work for us, it also allows for a better PCV custom map import into the OEMs ECU as a PCV can only change the F trims TPS/RPM & cant change pressure/RPM L trim tables.
As an example you might ask why have F & L trim tables one reading the TPS & the other reading Intake manifold vacuum, in short if you hold your hand in one place & fix the throttle in one place the TPS will remain at lets say 20% on a flat road, when we hit a hill with our TPS still fixed at 20% the ECU in the F table will still be at the same fuel cell & injecting the same amount as if we were on the flat, this is when the L trim tables sees a change as the intake manifold pressure & that it is now changing because the motor is put under more load because of going up the hill & the ECU now looks at the TPS/RPM in the back round & focus on the Intake manifold/RPM input signal & adjusts the A/F ratio to compensate for the engine load difference but you still have throttle control via the TPS, so in short the L trim tables are there to fine tune the motor, running in the back round looking at load changes & uses input signals from the intake manifold sensor, altitude sensor, coolant temp, RPM, TPS, O2 sensor voltage.
I contacted Flash Tune directly months ago & they have not been able to do it as yet but am sure it will eventually come out one day, I have already worked out how to turn off the closed loop circuit on my MT09 so the bike only runs in the open loop but the bike will require a full remapping for the open loop map & the mod needs to be plumed into the cooling system, I used to make the mod back in 2010 for the XT660 & can confirm it works on the MT but no longer build this mod. I updated the mod 3 times but found more riders could not install the mod easily & did not get custom maps built & I eventually worked out how to built my present plug & play O2 controller.
I could post the XT thread post that has every detail on how I did it but this is a MT forum & I no longer build this O2 eliminator mod as the O2 controller took it's place, just double click on one of the photo's below to see the rest of the XT photo's to get a general idea if you are interested.
