Ok, here I go again.
I've got an 08 S4Rs with the stock ECU, full Arrows, open airbox and a PC III.
Dynojet says that I shouldn't run the Lambda sensor with the present set-up. My buddy said that my bike's spewing raw gas (i.e.; very rich) when running through town. Does anyone know if disconnecting the Lambda sensor with improve things, make it worse, or cause no change?
TIA,
Frank
If you disconnect the lambda sensor the system will pop the engine light on, switch into the backup mode (1 sensor is not working..) and run poorly (even worst than now).
I suggest you to send your ecu and have it reflashed, the pc3 won't modify values below 5k and therefore the bikes run poorly @ low rpm's.
With the flashed ecu you will be able to trim each cyl to smooth out the ride and find the perfect air/fuel mix @ small throttle and with the pc3 you can custom map it and make it perfect @ wot and higher rpm's.
That would be the most inexpensive way to do it, then you can buy an aftermarket fully programmable ecu and spend from a grand and up.
There were several threads about PC IIIs not working right with the stock ecu and o2 sensor connected. With the arrows and open air box you need to get a DP ecu (or flash your stock ecu to DP specs) and ditch the o2.
You should have reflashed your ECU rather than getting pc3 IMO. I have an s2r. I have full arrows with beast-r intake and dp spec ECU. NO power commander. Had my bike tuned by my guy. Check it,
Arrows full carbon system - 1200
Beast-r - 350
Crankcase breather - 25
ECU reflash - 470
Pro tuned with vdst - 200
Total $2245
Runs like a dream. And this was the cheap route! Couldn't afford the termis.
Hope you figure it out. When you get it right, you will love the way it revs/responds. Well worth it. The guys are right about disconnecting the sensor with stock ECU. Not a good idea.