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Old 03-01-2013, 03:46 AM   #1
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Default Let's discuss AFR tables

As Joe started with the Ignition and VE-tables - I might as well add the AFR tables:

In this thread we ca see that there seem to be quite different opinions on the look of a good AFR table:

This is how mine looks atm:



According to Rev in the other thread the table is quite lean in the boosted area,
so I tried what the AFR table generator in TS might give me - this is what it gave me (hopefully my settings were correct - as I don't know my actual HP and TQ numbers)



Quite a difference...(but not in the boosted area...)
Discuss!
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Old 03-01-2013, 03:55 AM   #2
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TS generates afr tables!!!?!?
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Old 03-01-2013, 04:14 AM   #3
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My bottom row in VE table is locked, so the 20 row doesn't really matter.
My car weighs 600kg.
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Old 03-01-2013, 05:46 AM   #4
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Quote:
Originally Posted by curly View Post
TS generates afr tables!!!?!?
Yepp, if you open up the AFR table - then go under tools - AFR table generator.
(You can also get a VEtable generated.)
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Old 03-01-2013, 06:59 PM   #5
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I think the reason we didn't have this thread is that the subject-matter is pretty simple. Just about all you need to know has already been discussed in the spark advance thread (posts 46-48 -- post 48 has pretty pictures from Brain that sum it all up nicely).

https://www.miataturbo.net/megasquir...e3/#post953541

Bottom line, there are two values you care about:

14.7 (Stoichiometric) -- Economy and Emissions -- this is the switch point of a NBO2 sensor.
12.5 -- Fastest burn and maximum power.

Going rich from 12.5 slows flame speed and adds protection against det. There really isn't much reason to target values between 12.5 and 14.7. If you are in a zone where you want power, just go to 12.5. That's what you see the TS tool doing (making a quick transition from 14.7 and leaner to 12.5 and richer).

I also didn't know TS had this tool. Pretty cool.
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