Can IAT correction be turned off when in ASE? (heat soak issues) - Miata Turbo Forum - Boost cars, acquire cats.

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Old 10-30-2009, 07:35 PM   #1
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Default Can IAT correction be turned off when in ASE? (heat soak issues)

My warm start performance sucks. The IAT sensor heats up when the car is hot but not running and then on start it leans out until the IAT gets to the real air temp, or closer to it (classic heatsoak I think). (I have to sit on throttle to keep it from dying).

I figured that since my ASE is set for 30 seconds, it would be great if the IAT correction could be ignored while in ASE (30 seconds is about right for the IAT sensor to pick up the air temp)

Any thoughts?

For the record (MSPNP9093 (rev C.), no MAF, turbo, IAT sensor at inlet).

Last edited by aseer; 10-30-2009 at 07:47 PM.
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Old 10-30-2009, 08:22 PM   #2
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move the ait or just dump in a bunch of correction for the ait temps...
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Old 10-30-2009, 08:43 PM   #3
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move the ait or just dump in a bunch of correction for the ait temps...
I read your posts about moving the IAT. To start I was hoping to leave it as near to the intake manifold as I can get, at least for now though if the IAT is wrong even with air flowing then I need a different solution.

Not sure I understand your comment about dumping in a bunch of correction. My issue, which I think you've had as well, is that when the car is still hot and off that the IAT picks up the engine compartment temp since no air is flowing.
As such I want to turn off the correction since the IAT sensor is wrong until the air flow has run long enough for the IAT sensor to respond.

I was hoping that since ASE is active during the exact period where the IAT is re equilibrating, and thus wrong, that it would be great if I could just turn off the IAT correction during that period.

What correction were you referring to?
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Old 10-30-2009, 09:43 PM   #4
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when i had my sensor near the TB, I had to make my AIT corrections table something close to 150% at anything about 100*F...
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Old 10-30-2009, 09:51 PM   #5
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when i had my sensor near the TB, I had to make my AIT corrections table something close to 150% at anything about 100*F...
I'm 155% at 102F (which is my highest temp bin, I assume it is flat from there?).

With the car off but hot the IAT runs up to 150 F pretty often (and an automatic die unless I sit on throttle). I often don't even bother trying to start until it drops to something more reasonable (which gave me the idea of just having IAT correction off during the ASE period since it drops quickly once the air starts flowing).


I'm guessing the answer to my original question is no? (namely you cannot deactivate IAT correction while in the ASE period)

Last edited by aseer; 11-03-2009 at 09:53 PM.
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Old 11-03-2009, 09:53 PM   #6
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btw,

If anyone would be willing to share their IAT correction settings, I would appreciate seeing what you use (I use the default settings for the MSPNP9093 No MAF which is what I have).
I was worried I might have bad IAT calibration numbers but my still air comparative measurements with a calibrated probe match pretty well so far. (which makes me think that I need to adjust the correction values in the Coolant Related Air Density page)
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