How long does a MAF-T change take ?
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Burning Brakes
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From: Albuquerque nm
How long does a MAF-T change take ?
Had to set the MAF-T @ 2% lean (base setting), I'm told it takes about two hour's for the change.
Does this sound like a reasonable time frame ?
Does this sound like a reasonable time frame ?
Le Mans Master
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From: Fort Worth Texas
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Re: How long does a MAF-T change take ? (evil-1)
While changes to the fuel trims are technically runtime based. You will need to probably drive closer to 200 miles before being sure everything is normalized to the new setting.
Race Director
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From: Scarborough ME
Re: How long does a MAF-T change take ? (kewlbrz)
While changes to the fuel trims are technically runtime based. You will need to probably drive closer to 200 miles before being sure everything is normalized to the new setting.
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Re: How long does a MAF-T change take ? (wstory1)
While changes to the fuel trims are technically runtime based. You will need to probably drive closer to 200 miles before being sure everything is normalized to the new setting.
200 miles in 2 hours. What's the problem? :D
200 miles in 2 hours. What's the problem? :D
Racer
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Re: How long does a MAF-T change take ? (kewlbrz)
Maybe it takes that long to finalize but you can see differences in MAFT settings immediatly on the Dyno and the track.
I made 6 runs back to back on the dyno and changed settings the whole time and I was getting different HP/TQ measurments.
I made 6 runs back to back on the dyno and changed settings the whole time and I was getting different HP/TQ measurments.
Safety Car
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From: Midlothian, VA
Re: How long does a MAF-T change take ? (F8LPONY)
Maybe it takes that long to finalize but you can see differences in MAFT settings immediatly on the Dyno and the track.
I made 6 runs back to back on the dyno and changed settings the whole time and I was getting different HP/TQ measurments.
I made 6 runs back to back on the dyno and changed settings the whole time and I was getting different HP/TQ measurments.
Get your LTRIMS between 0 and -5 and then adjust your WOT until you can get MAX timing w/OUT KR.
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Re: How long does a MAF-T change take ? (F8LPONY)
Maybe it takes that long to finalize but you can see differences in MAFT settings immediatly on the Dyno and the track.
I made 6 runs back to back on the dyno and changed settings the whole time and I was getting different HP/TQ measurments.
I made 6 runs back to back on the dyno and changed settings the whole time and I was getting different HP/TQ measurments.
Non-WOT takes time to normalize the fuel trims no matter what.
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Thread Starter
Burning Brakes
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From: Albuquerque nm
Re: How long does a MAF-T change take ? (F8LPONY)
and the fuel trim run times are looked at by the pcm every 10min, 8-12 run times for full correction from what I understand..
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From: Murphy TX
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Re: How long does a MAF-T change take ? (evil-1)
and the fuel trim run times are looked at by the pcm every 10min, 8-12 run times for full correction from what I understand..
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Burning Brakes
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From: Albuquerque nm
Re: How long does a MAF-T change take ? (ToplessTexan)
So what would effect the update, driving through the entire power band ?
Is there any dif with the pcm relearn with driving habits, would driving harder put it past It's control limit's and prompt a faster relearn ?
[Modified by evil-1, 12:37 AM 4/30/2002]
Is there any dif with the pcm relearn with driving habits, would driving harder put it past It's control limit's and prompt a faster relearn ?
[Modified by evil-1, 12:37 AM 4/30/2002]
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From: Murphy TX
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Re: How long does a MAF-T change take ? (evil-1)
There are some factors that are in your control and some that are out. You can't do much about O2 density, gas quality, etc. (noting that these are things relevant to STFT control limits), but you can vary your driving to ensure that you cover the relevant cells (varying RPM and MAP/load.) The problem is that you're trying to go through a typical driving pattern so it's kind of hard to vary your driving to get that ;) Bottom line is that this requires some investment of time (and not to be alarmist, but you risk damage if you're impatient and make excessively extreme changes.)
If you want to get a feel for this, try looking at STFT and LTFT by FTC as timeseries data. You're after a feel for what the natural noise is in the LTFT signal.
If you want to get a feel for this, try looking at STFT and LTFT by FTC as timeseries data. You're after a feel for what the natural noise is in the LTFT signal.