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melonman
Senior Member Joined: 28 Jan 2018 Location: england Status: Offline Points: 526 |
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Posted: 01 Feb 2018 at 13:53 |
hi ,
just testing the ground. I have an aftermarket exhaust that came with my 1100 breva. the bike runs a bit lean with it on. but the bike sounds great. is there a simple way to richen up the bike or should I stay with the stock pipe ? I am in the process of balancing throttle bodies ,valve clearances and full service ready for the better weather. any advice would be appreciated. thanks craig |
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Brian UK
Moderator Group Joined: 13 May 2014 Location: Surrey Status: Offline Points: 17641 |
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The Lambda (O2) sensor controls the mixture for most of the usable range, so you have to over ride that. There are aftermarket gizmos which do.
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Brian.
Better 5 minutes late in this world than years early in the next. |
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Mike H
Senior Member Joined: 21 May 2014 Location: East Anglia Status: Offline Points: 8733 |
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I would expect the presence of the O2 sensor would enable the ECU to compensate? But the stock mixture strength is on the lean side anyway.
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"Chicken nuggets don't dance on a Tuesday."
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Brian UK
Moderator Group Joined: 13 May 2014 Location: Surrey Status: Offline Points: 17641 |
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As you say, the O2 sensor does make the mixture weak, this shows up more with more open aftermarket exhaust systems with more popping on the over run.
Units like the Finebau or Fat Duc are made to sort this out.
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Brian.
Better 5 minutes late in this world than years early in the next. |
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melonman
Senior Member Joined: 28 Jan 2018 Location: england Status: Offline Points: 526 |
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Hi mike
When you say the ecu will compensate I dont undsrstand Any more info would be great. I assume the air screws on the throttle bodies cannot be used to richen the mixture like on carbs Thanks for all replies |
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Brian UK
Moderator Group Joined: 13 May 2014 Location: Surrey Status: Offline Points: 17641 |
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The fuel injected is controlled by the ECU. It takes the output from the O2 sensor to adjust the mixture to what it is programmed to believe is the correct air/fuel ratio. In this respect, the exhaust doesn't affect things as the O2 sensor will override all.
The air bleed screws are only used to balance the tickover. As I said, there are aftermarket gizmos which will alter the output of the O2 sensor which then fools the ECU into thinking the mixture is too weak, thus the ECU compensates by injecting more fuel.
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Brian.
Better 5 minutes late in this world than years early in the next. |
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melonman
Senior Member Joined: 28 Jan 2018 Location: england Status: Offline Points: 526 |
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thanks Brian,
that makes sense. does the ecu need time/miles to determine correct fueling e.g new exhaust been leaner or is it instantly recognised and altered accordingly, if that makes sense thanks craig |
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Brian UK
Moderator Group Joined: 13 May 2014 Location: Surrey Status: Offline Points: 17641 |
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Pretty instantaneous.
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Brian.
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theoneandonly
Senior Member Joined: 24 Jul 2014 Location: london Status: Offline Points: 661 |
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break and make the lambda connector behind the starter motor first .
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melonman
Senior Member Joined: 28 Jan 2018 Location: england Status: Offline Points: 526 |
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@TOAO
Not sure i follow your reply. Do you mean to disable the o2 sensor/lambda ? Regards craig |
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Brian UK
Moderator Group Joined: 13 May 2014 Location: Surrey Status: Offline Points: 17641 |
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No, he said disconnect and reconnect it.
I'm fairly sure if you leave it disconnected it will throw up the service light. Though it will still run.
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Brian.
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melonman
Senior Member Joined: 28 Jan 2018 Location: england Status: Offline Points: 526 |
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So if i disconnect it
Fit the slip on pipe Then reconnect it Does this do some kind of reset ? Thanks craig |
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