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 Post subject: Close Loop - Deleting Fuel Alternating around Lambda?
PostPosted: Fri Nov 10, 2017 3:33 am 
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Joined: Sat Jul 09, 2016 7:05 am
Posts: 58
Not a specific problem just a general question...

From what I understand the reason that the fuelling target alternates around Lambda in closed loop fuelling is for the benefit of the cat, but if you don't have any cats fitted anymore, is it still necessary? Is there any benefit or reason to level out the fuelling target, i.e. delete the alternating target? If so, how can it be done?

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 Post subject: Re: Close Loop - Deleting Fuel Alternating around Lambda?
PostPosted: Sat Nov 11, 2017 1:08 am 
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Joined: Tue Apr 29, 2014 12:48 am
Posts: 723
You can work with the closed loop fueling compensation table. But I found it very hard to be done there is something missing in the closed loop code that makes the car target different AFR on cruise.

I changed the table to 0.001. so the car should target 14.7 always. But what happens is sometimes it target 14.7 and next drive it would target 14.9-15.3 then in the same drive it would target 14.7 again.

I have been searching for a solution but nothing so far. You can check this by logging Final fuel base.

What I ended up moving to the original values because its always close to 14.7 but still bouncing between rich and lean on cruise although when i switch to full open loop it does not do that.

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 Post subject: Re: Close Loop - Deleting Fuel Alternating around Lambda?
PostPosted: Mon Nov 13, 2017 4:55 am 
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Joined: Sat Jul 09, 2016 7:05 am
Posts: 58
H welaish, thanks for the reply. Aye, it was needing to run in open loop all the time for a few days (because of a failed O2 sensor) that got me thinking about this.

I'll have a play and see what happens.


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 Post subject: Re: Close Loop - Deleting Fuel Alternating around Lambda?
PostPosted: Mon Nov 13, 2017 11:05 pm 
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Joined: Wed Nov 22, 2006 10:23 pm
Posts: 2428
Is this what you're talking about?

viewtopic.php?f=40&t=8131

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Please don't send me tuning questions via PM - use the forums instead. Thanks!


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 Post subject: Re: Close Loop - Deleting Fuel Alternating around Lambda?
PostPosted: Tue Nov 14, 2017 12:37 am 
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Joined: Tue Apr 29, 2014 12:48 am
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yes correct thats a good option if you did not disable it.

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 Post subject: Re: Close Loop - Deleting Fuel Alternating around Lambda?
PostPosted: Fri Nov 17, 2017 8:08 am 
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RomRaider Donator

Joined: Sat Jul 09, 2016 7:05 am
Posts: 58
Hi. Yes I have disabled rear o2 sensor for fitting the wideband. I think the front (pre turbo) 02 sensor is at work now. To be fair if there is no perceived benefit that anyone can think of, I won't bother! It's more that I like to see as steady figures as possible on the wideband.#

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 Post subject: Re: Close Loop - Deleting Fuel Alternating around Lambda?
PostPosted: Fri Nov 17, 2017 9:29 am 
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Joined: Tue Apr 29, 2014 12:48 am
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You will always have the car on limp mode. Of u removed the front O2.

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