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Old 09-19-2019, 04:42 PM   #1
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Canned tunes (OFT) vs custom

My understanding is that canned tunes will be good enough for majority of owners, however, there's still room for improvement since every car is made slightly different. Even on completely stock cars, no 2 cars will respond the same to the factory tune.

My questions are, what should I be looking for in the datalogs to see how well my specific car is responding to the canned tune? Am I looking for AFRs and making sure command AFR is in line with the actual AFR? Basically, what can I see on the datalog to know that my car is responding well to the tune (what are e-tuners looking for)?
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Old 09-19-2019, 05:47 PM   #2
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There are some excellent threads on this by steve99. All you have to search is "ft86club OFT info"

http://www.ft86club.com/forums/showthread.php?t=64790
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Old 09-19-2019, 06:15 PM   #3
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Quote:
Originally Posted by ayau View Post
My understanding is that canned tunes will be good enough for majority of owners, however, there's still room for improvement since every car is made slightly different. Even on completely stock cars, no 2 cars will respond the same to the factory tune.

My questions are, what should I be looking for in the datalogs to see how well my specific car is responding to the canned tune? Am I looking for AFRs and making sure command AFR is in line with the actual AFR? Basically, what can I see on the datalog to know that my car is responding well to the tune (what are e-tuners looking for)?
Lots of info on this already as posted above, but the answer is that a canned tune is going to be inferior to a custom tune 75% of the time or more. Log might look clean but there may be some more room on the table.
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Old 09-19-2019, 06:18 PM   #4
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There are some excellent threads on this by steve99. All you have to search is "ft86club OFT info"

http://www.ft86club.com/forums/showthread.php?t=64790
I get that an aftermarket intake will require a new MAF scale. I'm referring to a stock intake, which is what the OFT is made for.

So looking at a few logs, I noticed the AFR can be inconsistent. By fine-tuning the AFR, to be more consistent/smooth, does this result in a smoother power delivery?

On a FA20DIT WRX, an e-tuner could just run the tune in full time closed loop. I'm assuming this makes it easier for e-tuners to tune. Can the FT86 platform be tuned in fully closed loop as well?
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Old 09-19-2019, 06:20 PM   #5
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Lots of info on this already as posted above, but the answer is that a canned tune is going to be inferior to a custom tune 75% of the time or more. Log might look clean but there may be some more room on the table.
That makes sense. I'm coming at this from an e-tuner's perspective. The only thing they can verify is the log, so I'm wondering what exactly they're looking for to do the fine tuning. Probably not a simple answer, so I'll continue reading.
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Old 09-19-2019, 06:25 PM   #6
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Quote:
Originally Posted by ayau View Post
I get that an aftermarket intake will require a new MAF scale. I'm referring to a stock intake, which is what the OFT is made for.

So looking at a few logs, I noticed the AFR can be inconsistent. By fine-tuning the AFR, to be more consistent/smooth, does this result in a smoother power delivery?

On a FA20DIT WRX, an e-tuner could just run the tune in full time closed loop. I'm assuming this makes it easier for e-tuners to tune. Can the FT86 platform be tuned in fully closed loop as well?
I referenced that thread because most of what you need to log is there if you were to read it. I would add knock correction, flkc, IAM, and ignition advance. Depending on the tuner they would want more or less info so if you are looking for a custom OFT tune you really need to be finding out and talking to who you are going to be dealing with.

Fuel system status ol/cl
AFR (actual measured by O2 sensor
Commanded AFR ( from OL Fueling table data)
LTFT
STFT
LOAD
MAF Volts
Throttle position
IAT
RPM
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