Dyno results in

so how about some proof?

 

I agree that with an O2 sensor, the computer should make different adjustments to the fuel mixture if you change how much air is being sent to the exhaust system.

I also believe that Honda engineers were likely smart enough to know this, since the system has been used for 20+ years on all the big name Jap bikes.

So to block the PAIR would, in theory, send less oxygen to the O2 sensor, the computer says, "HOLY SHIT WE ARE RUNNING RICH" and the computer should theoretically LEAN the combustion mixture out further. Most mechanics will tell you that LEAN is damaging to a motor.

SO, to remove the PAIR, without using a custom Dyno tune is reckless in my opinion. To tell people to remove the PAIR without telling them they need to do a custom Dyno tune is reckless in my opinion. Some people might think their bike feels "better" or more to their liking, but how do you know the current mixture is healthy for the long term of your motor?

If someone has evidence beyond "the seat of the pants guage" then I'm all for it. I want measured proof and not back yard mechanic, I'm smarter than the Honda Engineer, proof.

 

Further -
Since now a guy is doing a custom Dyno tune to smooth out the fueling and making sure the air/fuel mixtures are correct, why not just leave the PAIR system alone? It's well accepted that the PAIR does nothing to HP or torque. It does allow oxygen into the exhaust to burn excess hydrocarbons which is better for all of us. If the system is working as designed and doesn't impair your riding experience, then it's only good for everyone.

So, once again, unless someone is building a race bike and stripping every excess ounce off the bike, I believe it's a waste of time and energy to mess with PAIR valve removal. Do a custom Dyno tune and leave it alone. Don't be cheap.

 

if it's only open during deceleration, then how does it's removal translate into improved drive-ability?

And citing Wikipedia as a source is no more official or reliable than reading it here.

 

They don't know any better?

because maybe it's also open at idle as I've also read at VFRW?

Hold over from the carb days when it was open at idle and just off idle and would mess with the tailpipe dyno sensor?

because the tailpipe dyno sensor is at the back of the can and not up by the O2 sensor in the manifold (delayed reaction to the dyno reading of what's really going on vs. residual oxygen still being flushed through the exhaust system)?

 

pap - this isn't about you dude. It's winter and we've had this arguement across three different threads this week. It's just what we do when we're bored.