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melonman View Drop Down
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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 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 01 Feb 2018 at 14:26
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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Mike H View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mike H Quote  Post ReplyReply Direct Link To This Post Posted: 01 Feb 2018 at 19:08
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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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 01 Feb 2018 at 20:11
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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melonman View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote melonman Quote  Post ReplyReply Direct Link To This Post Posted: 01 Feb 2018 at 21:05
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 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 01 Feb 2018 at 22:53
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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melonman View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote melonman Quote  Post ReplyReply Direct Link To This Post Posted: 01 Feb 2018 at 23:02
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 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 01 Feb 2018 at 23:27
Pretty instantaneous.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote theoneandonly Quote  Post ReplyReply Direct Link To This Post Posted: 02 Feb 2018 at 11:46
break and make the lambda connector behind the starter motor first .
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melonman View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote melonman Quote  Post ReplyReply Direct Link To This Post Posted: 02 Feb 2018 at 14:58
@TOAO
Not sure i follow your reply.
Do you mean to disable the o2 sensor/lambda ?
Regards craig
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 02 Feb 2018 at 16:12
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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melonman View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote melonman Quote  Post ReplyReply Direct Link To This Post Posted: 02 Feb 2018 at 19:51
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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