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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > N54 stft and afr



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      03-25-2020, 06:49 AM   #1
Bimerfest3
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N54 stft and afr

Hello, can anyone analyse my datalog? I have a high stft especially on bank 1. I changed injectors on cyl 1 and 2 and 3 and my sparks plugs but atill getting high stft and also afr on bank 2 after letting off gas pedal is reaching 234 before bank 1 afr.
Can i solve these problems with tune???
Thank you
https://datazap.me/u/georgesfeg/fuel...0-508&mark=461
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      03-25-2020, 07:30 AM   #2
Bimmer_Engineer
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I think it would be easier to diagnose if there was an issue with a log of a steady acceleration.

If you have an auto, you need a 3rd gear log. I start at about 15 mph with the car in Sport and the DSC turned off. Floor the accelerator and don't let off until after the trans shifts to 4th gear.
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      03-25-2020, 09:15 AM   #3
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Quote:
Originally Posted by Bimmer_Engineer View Post
I think it would be easier to diagnose if there was an issue with a log of a steady acceleration.

If you have an auto, you need a 3rd gear log. I start at about 15 mph with the car in Sport and the DSC turned off. Floor the accelerator and don't let off until after the trans shifts to 4th gear.
ok i will upload a new log as soon as possible
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      03-25-2020, 11:55 AM   #4
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https://datazap.me/u/georgesfeg/air-...15-16-21-22-23

this is a new log. but i think when iat is over 90F cyl correction happen
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