Triumph Accesories Mufflers on R3T

Captain Bob said:

I put an underseat K&N on my completely stock 08 R3T. No noticeable change. I then installed TORS but still ran the stock tune the bike came with. Major difference in power. The motor woke up. Accelerating while at midrange felt good but a tad flat.

I then, using Tuneboy, remapped the ECU with the Triumph TORS tune and also opened up the secondaries 100%. Acceleration at midrange felt a bit better. I noticed however that after riding at sustained speeds for a while, the exhaust note would become quieter. Clearly the ECU was leaning out the mixture. If I were to head up a hill (put a load on the motor) and grab a handful of throttel a few times while under that load, the exhaust note would change back to its throaty sound. other then that, no discernable difference.

I think the "adaptive" ECU changes were always taking place but just could not hear it with the stock exhaust.

I then physically removed the 02 sensor, plugged in the 02 sensor eliminator, and also electronically shut it off with Tuneboy. Of course, no power change but...., that almost completely eliminated the ECU changing the mixture at sustained speeds. I say almost because, the ECU still changes the mixture but not at all to the extent it was doing before. I would say it is about 95% eliminated. I believe the other sensors are creating the changes based upon riding style at that particular period in time.

You can also always "clear adapters" with Tuneboy or implement a 12 minute tune to reset the ECU bringing it back to the throaty tune. Or...., just ride it hard and it will reset itself.

I have no decel popping, the motor pulls hard from the bottom to the top, roll ons from 70 -80mph are a hoot. I hear no pinging, so therefore feel the engine is running OK. I should (and will) get a spark plug reading to verify once the snow clears.

Only complaint, and it is minor, is that the throttle is a tad notchy at real slow speeds.

Click to expand...

I guess my question would be this. The bike runs better with the pipes and the TOR download. But while cruising down the road you can hear the ECU lean out the bike by the sound of the pipes. But when you romp on it it wakes back up and gets it on. What's wrong with that? I want the bike to go a bit lean at steady throttle so I get better fuel mileage. As long as it does not go so lean it starts to surge. Now that you removed the O2 sensor, what will that do to your cruise fuel milage? Make sense?

Why I choose to leave my O2 sensor alone..you are entittled to your choice also:{Tampering with or modifying the signal that the oxygen sensor sends to the engine computer can be detrimental to emissions control and can even damage the vehicle. When the engine is under low-load conditions (such as when accelerating very gently, or maintaining a constant speed), it is operating in "closed-loop mode." This refers to a feedback loop between the ECU and the oxygen sensor(s) in which the ECU adjusts the quantity of fuel and expects to see a resulting change in the response of the oxygen sensor. This loop forces the engine to operate both slightly lean and slightly rich on successive loops, as it attempts to maintain a mostly stoichiometric ratio on average. If modifications cause the engine to run moderately lean, there will be a slight increase in fuel economy, sometimes at the expense of increased NOx emissions, much higher exhaust gas temperatures, and sometimes a slight increase in power that can quickly turn into misfires and a drastic loss of power, as well as potential engine damage, at ultra-lean air-to-fuel ratios. If modifications cause the engine to run rich, then there will be a slight increase in power to a point (after which the engine starts flooding from too much unburned fuel), but at the cost of decreased fuel economy, and an increase in unburned hydrocarbons in the exhaust which causes overheating of the catalytic converter. Prolonged operation at rich mixtures can cause catastrophic failure of the catalytic converter (see backfire). The ECU also controls the spark engine timing along with the fuel injector pulse width, so modifications which alter the engine to operate either too lean or too rich may result in inefficient fuel consumption whenever fuel is ignited too soon or too late in the combustion cycle.}Now I am aware that the catalytic converter has been eliminated and with the installation of a PowerCommander one has eliminated the need for the O2 sensor..but my Jardines have a bung hole for the sensor and thus I have it hooked into the loop..Installation of PC5 this spring..will then follow their suggestions!