This is a great topic and needs a permanent place for everyone to reference. The Technology and success will be constantly evolving. There are a lot of people out there that will be a great resource. Dobeck Performance, Athena Get VT-1 Configurator, Bazzaz, Power Commander, and others. American Performance Technology - APT and the smart carb.
ECU tuning and Carb jetting--- let's share what we're doing, our experience, the good and the bad, trials and errors!
Greetings Snowbikers!! I can say I'm excited to tear off my dirt wheels this week and strap on the ST and hit some early season riding days! I hope everyone is too....or already has -- lucky ducks.
To start with - and peering back into the carbureted days - yes, Dynojet has a full line of jet kits to fine tune your 2 or 4 stroke machine albeit not as neat as the APT (cool stuff there) and not our main focus in current days.
But lets talk Fuel Injection. Many users are choosing an FI bike for the snow kits for consistency and ease of use. For tuning on these Dirtbikes, Dynojet has devoted countless hours to development around these machines as evidenced by our product base.
We offer a fuel + ignition controller for all Yamaha and Honda bikes, and a Fuel only controller for all KTM and Suzuki bikes.
All of these controllers are compatible with our Autotune Devices - if you so wish to monitor or tune to your set AFR value, but is not required.
As an added bonus -- and most noteworthy since this is "keep fuel out of your oil" thread, is the availability for an Analog input in the PCV. This quickly gives you full control over trimming the fueling based on a sensors output - just like how an ECU would do. All OEM's (whether Auto or powersports) are using series of sensors (IAT/MAP/ET/etc.) to monitor the engine operating conditions to calculate an output pulse to deliver to the injectors/spark plugs. Cold Engine temp = add fuel, High Elevation = subtract fuel, and countless others. Many (including myself) have seen the piles of fuel that drain into the oil from the bike Over-compensating (some are worse than others) and delivering too much fuel in the cold/high temperatures/elevations of SnowBike land.
Enter Power Commander V -- If your ECU wants to add excessive amounts fuel below 50* Intake Air Temp, or 120* Water Temp, or above 7000' Elevation, or any signal -- any of these analog signals can be read into the PCV and adjusted upon. So let's use the air temp over fueling condition - we pipe this signal into the PCV, and to mitigate the over delivery of fuel below i.e. 50*, we pull out 2% fuel. Then under 40*, we pull 5% fuel, under 30* pull 10% fuel (or any combination)-- this is all configurable to meet your needs to subtract any amount at any temperature/pressure.
Easy, Right??? And a simple method to solve the over-fueling problem all plug and play.
And to clear up some misconceptions, the Autotune function is a tried-and-true auto map/auto tune device.
Simply put and how all Closed looping systems operate -- an O2 sensor reads the ratio of air:fuel exiting the combustion chamber. If the signal at the given operating condition is not within a spec'd parameter set by the ECU (or PCV in this case), the device trims the fuel up or down to meet the specification.
Added feature of the PCV -- once this operating condition has been run through, the PCV remembers the trim that it had to come up with to meet your Target AFR from the time before, and already has the fuel delivery on par with what you desire and does not need to re-calc and re-trim to get there. Closed loop ECU guru's might know this as "long-term trims" that the ECU may utilize as your engine changes due to clogged injectors, clogged air intake, or other operating factors.
If anyone has any further questions, feel free to ask me or contact us directly! I'm always happy to help out a fellow powersports enthusiast.
~T.J.
