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Old 05-12-2015, 02:11 AM   #1
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Default Remove AIT/MAT Sensor from Intercooler While Tuning

This may seem like a weird question, but I was wondering if it would make any sense to remove the IAT/MAT sensor from the intercooler or charge pipes while tuning and just leave it in free air.

I was wondering if this would help VEAL work better at the creating a good tune, and then using MAT corrections afterward to compensate for air density/ambient temp.

With the AIT in the intercooler and driving around for any period of time, with an ambient temp of 68f my AIT can vary from 70f-110f without trying too hard. Does this cause another issue with rich/lean tunes.

I still haven't found out how to completely solve this issue.
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Old 05-12-2015, 06:58 AM   #2
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terrible idea.

MS uses intake temperature as a key part of it's fuelling calculation. If you give it a false reading your tune will be miles off when you then give it it's true reading.
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Old 05-12-2015, 09:21 AM   #3
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how about simply turn off temp corrections, tune the car, then apply as needed to keep tune in check?




Your AIT is in the IC and cruising you get temps 40 above ambient?
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Old 05-12-2015, 01:40 PM   #4
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Quote:
Originally Posted by Braineack View Post
how about simply turn off temp corrections, tune the car, then apply as needed to keep tune in check?




Your AIT is in the IC and cruising you get temps 40 above ambient?
I wasn't aware that you could turn temp corrections off. This sounds like it would help a lot. Is this the same temperature corrections that you've had issues with MS developers for a long time?

And no not cruising will it change that much. I'm just saying while running VEAL, when you do a hard pull, the IC gets hot then you're driving around and VEAL is adjusting based on a hot air temp until it cools back down.

And as a side note, I tried running VEAL on my car at the track a couple weekends ago, it had a pretty good tune on it, ambient temps were 90f and it just kept pulling fuel out of my tune everywhere as the intercooler got hotter and hotter. Ran the car the next day when it was probably 70f outside and it was lean everywhere.
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Old 05-12-2015, 01:46 PM   #5
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1) disable temp corrections/ego/overrun
2) tune car completely
3) re-enable all, and adjust temp corrections for different temps

side note: from what I noticed, unless your temp corrections are crazy high/low, it doesn't really swing the afr's that much. you can test this by idling the car with ego off and raise/lower the correction 5-10%, it won't affect it that much (or at least didn't when I tried it)
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Old 05-12-2015, 01:49 PM   #6
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there's no need to disable enrichments or ego or overun. that just makes your car run like dick while you are trying to tune and drive.

just 100% out your MAT corrections table and tune the table when needed. the defualt curve is overtly aggressive.
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Old 05-12-2015, 01:53 PM   #7
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/\ I disagree with him, therefore he's wrong



And it actually, in all seriousness, runs fine because I actually spent a ton of time dialing it in to do so. Then when I flip those on, it runs seriously awesome.
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Old 05-12-2015, 02:42 PM   #8
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Quote:
Originally Posted by Braineack View Post
there's no need to disable enrichments or ego or overun. that just makes your car run like dick while you are trying to tune and drive.

just 100% out your MAT corrections table and tune the table when needed. the defualt curve is overtly aggressive.
I think you may have just saved me years of trouble. Has this been the case with the older firmwares? I'm on a newer Rev MS2e I think 3.3.1 firmware

And Vlad, I'm currently using your smiley face table.
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Old 05-12-2015, 02:47 PM   #9
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The air density table (or whatever it's called) is a little aggressive out of the box, if you ask me. I'd try to disable it too, get fueling set, then enable to make sure it's right in most temps. Seems like it goes super lean when hot, rich when cold. Especially if you haven't nailed WUE.
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Old 05-12-2015, 03:27 PM   #10
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with older firmwares you have to alter the table in a way to negate built in temp corrections.

If you go to the mat corrections table the firmware will say if it's the new method or not.
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Old 05-12-2015, 05:21 PM   #11
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I will zero out the MAT table and will leave everything else On (enrichments, EGO and Overrun). Those things don't ever seem to cause any problems.
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