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Old 10-01-2010, 10:59 AM   #1
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Default Tnuerstudio MAT vs warmup correction

Finally thanks to Brain I appear to have all of the underlying enrichment pulled out of my msq.

Here is my question. When for fuel while the car is cold. Is it better to adjust the warmup enrichment until the MAT temp comes up to a "normal" operating temp, or leave the warmup constant and adjust the MAT values?

Obviously if I reduce the warmup I will need to increase the MAT correction table.

My MAT scaling factor is still 100%


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Old 10-01-2010, 03:53 PM   #2
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Since no on wants to contribute I will post an update and current thoughts about the situation.

new table


I've realized that I have been going about this the wrong way. I have been autotuning at two different times of the day when the outside temp delta of ~ 15-20 degrees. This has resulted in me tuning in different areas of my MAT correction table that isn't quite sorted yet.

So. I am now limiting my tuning to periods when the temp is almost the same as the previous autotune session, and then adjusting the MAT correction based on idle AFR and MAT.
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Old 10-01-2010, 04:11 PM   #3
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dude, what are you doing?! Just zero out that table. and ONLY use it for when the ECU starts pulling fuel when the AIT sensor is heatsoaked. You're making this more complicated than it is and really hard on yourself.
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Old 10-01-2010, 04:18 PM   #4
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The afr's don't remain stable when the table is zeroed. It's lean in the morning when it is cold, then it leans out when it gets hot.

I didn't pull values out of a hat, this is what I am seeing.
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Old 10-01-2010, 04:26 PM   #5
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there should not be that large of discrepancy based on your AITs.

you tune warmup so the AFRs stay a little rich below 160*F. That's why there is so much correction on that curve.

ASE should be tuned so it stays a little rich after any start at any temp.


but as far and the car running between 30-80*F intake temps, with the map zeroed out your AFRs should not be all over the place like that. You really need to keep a lot of enrichment off when firs tuning to get the VE table in check, then you can use these tools to fine tune it.

If I used that AIT map, I would go insane with that, wait till it gets cold out and you run 10:1 in cruise.
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Old 10-01-2010, 04:34 PM   #6
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I am at the point of insanity with this. I'm going to go on a nice long drive this afternoon and autotune. I'm going to keep ego off and the MAT at zero.
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Old 10-01-2010, 04:35 PM   #7
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that's the ticket!
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