It’s finally here, our Race Spec ECU Flash for the Yamaha R3 is ready. There are some serious issues and limitations with the stock ECU in the Yamaha R3, and a quick search of the internet will reveal pages of complains of dead spots and hesitation in the power band, sometimes even after tuning with a Power Commander, Bazzaz, Rapidbike, or other piggyback fuel controller. The problem lies deep in the stock ECU’s base maps.
This is not the same off-the-shelf “unrestricted” map available from other vendors or Flashtune directly. We have over 50 hours invested so far developing this ECU flash. Nobody has a better flash.
This ECU flash not only corrects the issues in the stock ECU base map that are partially to blame for the hesitations, it includes a host of other improvements:
-Remapped fuel delivery that is optimized for a high flow air filter and the M4 full exhaust system or other full exhaust systems. We also tested this flashed ECU with a completely stock bike and no other changes gained similar improvements across the board, including an increase in horsepower from 36 to 38.
-Remapped fuel injector timing
-Remapped ignition timing
-New throttle control map
-Raised rev limiter
-Increased idle speed
-Added accelerator enrichment mapping for rapid throttle changes (one of the primary causes of the stock hesitation)
-Reduced engine braking
-Disabled the OEM Air Injection System
-Disabled the OEM closed loop O2 sensor system
-Disabled the OEM injector deceleration cut
And yes, you read that correctly, whether you have a bone stock bike, slipon exhaust, or a full race exhaust, you no longer need a Power Commander, Bazzaz, or other piggyback fuel controller once we flash your stock ECU. You still may want to fine tune your bike with a piggyback fuel controller, since every bike is slightly different, but it isn’t necessary. Installing a flashed ECU also could not be easier. Unplug the stock ECU, and plug in the flashed ECU. That’s it! Just be careful with the connector on the stock ECU, it has a special locking connector, so don’t force it.
While this ECU flash definitely opens up extra top end power which is undeniable in the dyno charts below, the bigger improvement is actually in the midrange where you feel it driving off the corner. The bike revs considerably faster, with increased torque, as well as the increased top end horsepower. We’ve seen gains so far of 0.5-3 HP across the entire power band over a custom tuned piggyback fuel controller system, and similar increase in torque. I will try to upload a dyno chart showing RPMs vs. time to show how much faster the bike builds power compared to the stock ECU, but for now, here’s a couple before and after dyno reports:
Here’s my personal bike with full M4 exhaust, BMC filter, and 415 chain. The before line is with the stock ECU and Bazzaz fuel controller custom tuned, the after line is with the Bazzaz disabled running only the flashed ECU:
Here’s fellow racer Ari Henning’s bike with a full Yoshimura exhaust. The before line is with the stock ECU and a PCV with fuel and ignition timing custom tuned, the after line is with the PCV removed from the bike running only the flashed ECU:
Here’s another bike with a supersport built motor, bored throttle bodies, and the airbox cover removed, full M4 exhaust, and MWR race air filter. The before line is with the stock ECU and a PCV with fuel and ignition timing custom tuned, the after line is with the flashed ECU and the PCV retuned to match the flashed ECU’s performance improvements: