anyone know their air/fuel ratio? Especially if you have a VF stage 2? - LotusTalk - The Lotus Cars Community
 
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post #1 of 10 (permalink) Old 02-25-2013, 05:25 PM Thread Starter
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anyone know their air/fuel ratio? Especially if you have a VF stage 2?

I have recently added a air/fuel monitor, it runs off a wide band oxygen sensor after the cat hooked to a lc-1 o2 sensor conditioner.

It's saying I'm at 10.5 at wide open throttle.

Anyone else with a VF kit know their ratio? Or anyone at all know theirs with a stock tune?

Is there a way to use the factory o2 setup to determine wide open air/fuel?


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post #2 of 10 (permalink) Old 02-25-2013, 05:50 PM
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Is the (Aftermarket Wideband) o2 sensor suppose to be before or after the cat? (That's a genuine question because I am clueless about this stuff). Wouldn't the cat give you a scewed reading of AFR if the sensor is downstream?

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post #3 of 10 (permalink) Old 02-25-2013, 05:52 PM Thread Starter
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anyone know their air/fuel ratio? Especially if you have a VF stage 2?

The guys at dyno tune nitrous said to put it after, they make the lean switch / gauge.
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post #4 of 10 (permalink) Old 02-25-2013, 06:13 PM
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I'd say put it before the cat and then look at your afr because going through the cat then being monitored is is deffinantly going to tell you it's lean
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post #5 of 10 (permalink) Old 02-25-2013, 06:27 PM
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It should be before the cat.

Although typically it will read a little leaner after the cat.

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post #6 of 10 (permalink) Old 02-25-2013, 06:53 PM
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Definitely should be before the cat and under normal condition should read around mid 13s slightly lower under full throttle if car is boosted you will usually see low 11s full throttle depends on the tune as to exactly where it will run.
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post #7 of 10 (permalink) Old 02-26-2013, 04:53 AM
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I've got a VFII.
As others have noted the sensor is before the cat. At idle it hovers around 14, WOT is 11's

VFII, Eliseparts Sequential, Geartronics Paddle shift.
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post #8 of 10 (permalink) Old 02-26-2013, 02:52 PM Thread Starter
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anyone know their air/fuel ratio? Especially if you have a VF stage 2?

Well I get my low numbers at idle weird.

Okie so I need to make a new friggin bung hole and also need to replace my front o2 sensor cause I got a p0133 code slow response too.

Now I ask; on our supercharged cars why are we targeting 11 air/fuel when 14. Something is ideal???



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post #9 of 10 (permalink) Old 02-26-2013, 03:14 PM
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Well I get my low numbers at idle weird.

Okie so I need to make a new friggin bung hole and also need to replace my front o2 sensor cause I got a p0133 code slow response too.

Now I ask; on our supercharged cars why are we targeting 11 air/fuel when 14. Something is ideal???



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About 14.7 (Stoichiometric) is an "ideal" air fuel ratio for a cruise or light acceleration. However once the engine sees high load (hard acceleration or wide open acceleration) you need to purposefully inject more fuel (command a rich air/fuel ratio) to ensure that the combusion chambers stay cool and to help combat against knock. So you should see about 14.7:1 (it should bounce back and forth a 1 point around there) at a cruise and much richer at WOT.

You will need to fix that primary O2 code before you really start trusting your numbers and/or want to spray it with nitrous. Each PCM acts a little differently with codes active and you want to make sure you have a good baseline before you start tinkering.

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post #10 of 10 (permalink) Old 03-03-2013, 03:13 PM Thread Starter
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anyone know their air/fuel ratio? Especially if you have a VF stage 2?

I appreciate the help, I ordered a new bung.

I am going to inspect the pre cat sensor clean it and see if I get the engine light again.

I am searching for the part number for the Denso version. I heard you can get one from a non lotus source.


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