Id like to add a little more food for thought. I have seen some say the stock ecu is better, some say good enough, some say all parameters are adjustable. This just isnt true. The stock ecu does a real diservice to our snowbike engines because of the way we operate these engines. Load, cyl temps, coolant temps all change from snow depth, OAT, and altitude. Every bike is different. The stock ecus are more or less locked and are very restricted when it comes to snowbike specific application. Here are some of the benefits of a PR2 vs stock.
1. The stock ecu does not allow u to adjust many of the critical parameters needed such as high altitude compensation to the degree needed.
2. It is unable to stop the over fueling of the engine when coolant temps plummet.
3. Cant change fuel timing spray pattern. Timing and quantity.
4. Accelerator squirt is not a allowable parameter.
5. Voltage spark for load variance. Unchangeable
6. Fuel atomization is set and unchangeable for intake shape and design.
7. Moving the max fuel flow into correct time zone. These bikes are at 50%-70% throttle for 10-15min at a time. They have huge load and the fueling needs to be adjusted into the correct zone. Not just a MX curve.
Jeff at PR2 has personally built engines for the likes of Dungey, Canard, Anderson, Millsaps, Tomac as well as top amatuers from around the world. As a mechanical engineer he has a passion for these engines. It amazes me when he can take time and talk engines and fueling to a far away Canadian snowbiker lol. As i said earlier this is what the 4 stroke has been waiting for in this sport.
So far im very impressed with what ive seen on my YZ. im going to get a map switch since my ecu is a little hard to get to easily and be able to switch between 2 maps.
. Last night we got about another 12 inches of 5% density. I think you're going to have a pretty good time out there.
