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Adjusting AFR targets but making no difference, also AEM targets in volts

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Adjusting AFR targets but making no difference, also AEM targets in volts

Old 12-14-2011, 06:18 PM
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Default Adjusting AFR targets but making no difference, also AEM targets in volts

Hi all

I'm from the UK and have just turbo'd my Miata (jap import) and am using a MS PNP that I bought from DIY but am struggling as it runs really rich on boost.

I'm having trouble setting my AFR targets

1: they come up as voltage rather than AFR,
I'm using and AEM UEGO gauge and afr is reading the same as the gauge on the megatune, however the AFR table still shows volts?

I followed some instructions off this site but have had no luck.

2: adjusting the AFR voltage table using the AEM supplied AFR/Volt table for reference but it doesn't seem to make any difference - on boost it goes super rich, 10 and I guess that is the bottom of the gauge so it might actually be lower.

I think I must have something incorrectly ticked, but cannot find it.


Cheers Gareth
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Old 12-14-2011, 06:32 PM
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Adjusting the targets does just that, it adjusts the targets, if you want the actual fuel table to change you need to amend the VE table.

The AFR target table is used by the ECU when in closed loop i.e. when it's using the output of the O2 sensor to adjust the target. You do NOT do this when in boost/at WOT.

TunerStudio when running VE Analyze Live or Megalogvier when running logs offline also use the AFR target table to adjust the VE table.
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Old 12-14-2011, 07:03 PM
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Oh ok, so above 100kpa the AFR table isn't used, it's only there for logging in TS or MegaLogView to refine the VE table.

I'll have a play with the VE table and try and get it somewhere near before using MLV as I tried to use it before and it had an adverse affect on my vacuum running points.
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Old 12-14-2011, 07:06 PM
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VE Analyze in TunerStudio is about a million times better than just MegaLogViewer + logging.
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Old 12-15-2011, 05:00 AM
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Originally Posted by soviet View Post
VE Analyze in TunerStudio is about a million times better than just MegaLogViewer + logging.
Er, it's exactly the same, just not 'live'.

Oh ok, so above 100kpa the AFR table isn't used, it's only there for logging in TS or MegaLogView to refine the VE table.
Actually you define in the ECU when closed loop occurs, you could set it to be in a narrow band between 80-85kpa or you could set it to never turn off. That's the beauty - and danger of full control.

I'll have a play with the VE table and try and get it somewhere near before using MLV as I tried to use it before and it had an adverse affect on my vacuum running points.
If MLV messed up your tune then your AFR targets aren't correct, all it will/can do is adjust the VE table to get as close to the set target as it can.
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Old 12-15-2011, 05:05 AM
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Thanks for the feedback, how do I set the closed loop region? sorry a bit new on MS.

Now you have mentioned it my targets in the AFR table were way off, they were in voltage (which is fine ) but a voltage that related to a rich AFR. I'll update the table and try MLV again.

Cheers Gareth
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