Best AFR for Perfomance vs. Economy

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s5fourdoor

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	Re: Best AFR for Perfomance vs. Economy « Reply #15 on: October 04, 2011, 10:18:28 AM »

Quote from: nyet on October 04, 2011, 12:01:22 AM

injectors and spark turns off on decel.

ok so this isn't dangerous then? thanks for the info btw... could we put a link on the wiki for this?


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NOTORIOUS VR

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	Re: Best AFR for Perfomance vs. Economy « Reply #16 on: October 04, 2011, 11:15:42 AM »

no it's no dangerous... it prevents unburnt fuel getting to the catalytic(s). Every FI car does this (some very early fuel injection cars don't but that is still very rare).


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Rick

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	Re: Best AFR for Perfomance vs. Economy « Reply #17 on: October 04, 2011, 12:52:50 PM »

As above,

it's been a feature of pretty much any ECU built in the last 25 years.

It's a cat saving and fuel saving device.

Nyet, I have done some work with leaded race fuel, which is pretty much completely knock proof, but I haven't come to a definite conclusion yet. I suspect though that best power will be around 12.5:1, and pretty flat from 11:1 to 13:1. ECUplot is really helpful for stuff like this

Rick


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Giannis

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	Re: Best AFR for Perfomance vs. Economy « Reply #18 on: October 08, 2011, 04:40:15 AM »

I am running for some time now lambda 1.10 at low load part throttle conditions and i am decreasing it as the load goes higher than 80% to stock 1.00. I have a noticable fuel economy without any problems until now. Do you think that this it too lean? I have an 1.8t engine 180 ps.


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Gonzo

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	Re: Best AFR for Perfomance vs. Economy « Reply #19 on: October 08, 2011, 02:16:32 PM »

No you should be OK


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jibberjive

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	Re: Best AFR for Perfomance vs. Economy « Reply #20 on: October 24, 2011, 12:53:56 AM »

What is stock AFR for under load and partial load, for the 2.7t?


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robin

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	Re: Best AFR for Perfomance vs. Economy « Reply #21 on: October 24, 2011, 05:40:02 AM »

stock 2.7T is 14.7 nearly everywhere, unless you're deep into 4th/5th gear during a long pull.


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