Fascinating reading. While both my bikes have Aftermarket Exhaust (full on my Busa), with the exception of Race filters, the Electronics are all stock. Mostly because I knew it would perform WELL ENOUGH with the mods, but would also perform without issue if I ever wanted to change/remove the exhaust to replace or to sell the bike.
My question is: When you do an ECU Tune, what happens when you change one of the parameters (Full exhaust, back to stock exhaust, etc.), do you then have to have the ECU retuned so that it will run stock without issue? I know if you use a fuel management device, then you have to use a different map. Could you please elaborate on whether or not this hurts or helps an OEM bike, or what has to be done if you then change the configuration after the tune?
Thanks!
Ninety percent of what is done to the ECU when it is reflashed has nothing to do with AFR . . . removing factory restrictions, optimizing the fuel and ignition curves, deceleration out-ramping, throttle maps, increasing rev limits, removing top speed limiters and ignition retard in the lower gears. If you tell us that you have a full exhaust, the fuel mapping will indeed be changed to accommodate that exhaust. If you then go and install a stock exhaust back on that same bike, the fuel mapping will be off. The only way to rectify that would be either another reflash, or piggybacking a fuel module like a powercommander, and making the relevant adjustments. Everything previously done during the reflash - all the parameters that were changed, other than fuel - remain, and are fine.
In regard to a totally stock Hayabusa, we are seeing 6-8 more peak rwhp on these with the Ecu Unleashed reflash. Which brings me to another point that is oh so important:
I was asked about a Kaw 636 (sixpack?), and what an EU reflash could do for that bike. My response was that the normal results seen on the older 600cc bikes is anywhere from 4-6% at peak, as well as significant gains in the mid-range, where 600s need it the most. Now, that 4% gain would be realized with a STOCK exhaust - you would see more with additional mods like a full exhaust. Results can depend on many things like mileage, engine condition, etc, but you should expect them and will get them. Remember, thats part of our guarantee. Now, here is the point I wanted to get to, and it applies to every bike:
Due to the optimized deceleration mapping (off-throttle fuel mapping), your bike is going to show much improved ride-ability and on/off throttle characteristics. These improvements offer better stability and predictability during corner entry, mid-corner corrections and exits, giving you a more stable bike overall. Our roadracers are seeing significantly better lap times - and this is simply by increasing the rider's confidence.
And yes, a fuel module like a powercommander or Bazzaz can be piggybacked right along with your reflashed ECU, and this will NOT cause any issues - as long as it has been professionally tuned by an authorized tuning center.
BTW - POWERHOUSE MOTORCYCLES is up and running in regard to EU reflashing. In the upcoming weeks, we will be hitting this forum with bikes and dyno charts for motorcycles being reflashed in our shop. We have several bikes lined up, and will post all results . . .
