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AFR meter
#1
I'm considering buying an AFR meter and possibly a data logger to make dialing in carbs easier, faster, and hopefully more accurate. Does anyone have experiences, good or bad, with particular brands and models? The experience doesn't have to be with carbs. I'm looking for information on ease of use, accuracy, repeatability, longevity, and helpful features. Thanks for any and all feedback. Chuck
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#2
I bought an Innovate. It just quite working after about three years. I found it very useful. My biggest surprise was observing how at other than WOT hitting theoretical AFR targets did not always produce good drivability. I often had to be a bit rich to get a smooth and responsive running engine. I believe the reason for this is the meter is reading the average AFR of the bank being sampled. Any lean cylinders will hut the way the engine runs a lot more than some cylinders that are a bit too rich. This along with reversion and other issues with a larger cam require added fuel as a sort of a crutch ( timing curves were modified for the cams and compression).

I thought that maybe I was getting less than accurate numbers for a while but I ran one car on an engine dyno and the dyno's AFR ratios were very close to mine.

I found that I did not use data logging much. Real time driving a typically gave me adequate information to then adjust carbs. Having a passenger can call out numbers at a few key times and make it very easy to be ready to tune as soon as we stopped the car.

On cars with smaller cams (less than about mid 230s @ .050) getting close to theoretical targets tended to produce a great driving car.

I liked the unit enough to buy a second one.
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#3
The simplest for afr monitoring is probably the AEM which is what I use. It does not have data logging capability. https://www.summitracing.com/parts/avm-30-4110

For data logging I would suggest one of the Innovate systems like the LM-2.

Be advised that the sensors are designed for use with unleaded fuel. They will work with leaded fuel but the sensor life becomes extremely limited. Most octane boosters have a similar effect and any type of silicone that enters the fuel system kills them pretty quickly too.

Lots of knowledge here: https://www.tapatalk.com/groups/racingfuelsystems/

73 conv. 460, D0VE large valve heads, Performer RPM manifold, Voodoo 227/233 cam, Holley 950 HP carb, C6 trans, 3.25 trak-loc.
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#4
(04-02-2018, 07:18 AM)TommyK Wrote: The simplest for afr monitoring is probably the AEM which is what I use. It does not have data logging capability. https://www.summitracing.com/parts/avm-30-4110

For data logging I would suggest one of the Innovate systems like the LM-2.

Be advised that the sensors are designed for use with unleaded fuel. They will work with leaded fuel but the sensor life becomes extremely limited. Most octane boosters have a similar effect and any type of silicone that enters the fuel system kills them pretty quickly too.

Lots of knowledge here: https://www.tapatalk.com/groups/racingfuelsystems/

Thanks for the responses guys. And the Racing Fuel site indeed does have a lot of good information, thanks Tommy. I've heard some disturbing things about the LM-2, reliability and unstable RPM. Chuck
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