JB4tech.com - International Turbo Tuning Discussion
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jisoo jisoo is offline
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Car: bmw f10 528i n20
Default n20 528i AFR question - 03-27-2022, 05:56 AM

2013 n20 528i PWG model.

i installed JB4 with bluetooth , oil catch can, big intercooler , FTP charge cooler and boost pipe.

but no Down pipe and air intake tune.

It seems that my car runs rich.

I usually drive with MAP4. When driving a little aggressively, I run with map1

I always watch the AFR while driving on bluetooth app , and the afr at idle is 14.6~14.8, which seems to be very stable.

But cruise rpm is approx 1200? At 70~80km/h, the range of AFR change is large. It seems to me that there is a lot of change from 13.5 to 14.6 and back to 13.9 or 15.0 15.2 15.5.

At this time, there is no change in RPM. The speed is also maintained at 80km/h because cruise is on and running.

It doesn't seem like it was done before.

After feeling this, soot is forming in the tailpipe.

Before that, there was no soot in the tailpipe.

The fuel economy also seems to have decreased, and when I press the accelerator pedal, sometimes the acceleration does not work, but the rpm soars to 3000~4000 and the car jumps out.

The MAF was also replaced and the O2 sensor pre and post were also replaced.

There seems to be something wrong with the car. Any advice please.
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Cannon @ BMS Cannon @ BMS is offline
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Car: Evo VIII
Default 04-04-2022, 02:30 PM

Please upload a log for assistance. Thanks!


Burger Motorsports
Home of the JB4 the worlds most popular turbocharged tuning system!

It is the sole responsibility of the purchaser and installer of any BMS part to employ the correct installation techniques required to ensure the proper operation of BMS parts, and BMS disclaims any and all liability for any part failure due to improper installation or use. It is the sole responsibility of the customer to verify that the use of their vehicle and items purchased comply with federal, state and local regulations. BMS claims no legal federal, state or local certification concerning pollution controlled motor vehicles or mandated emissions requirements. BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways. Please click here for more information on legal requirements related to use of BMS parts.
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jisoo jisoo is offline
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Car: bmw f10 528i n20
Default Log upload - 04-18-2022, 08:07 AM

Plz advice! Thank you
Attached Files
File Type: csv P17_M4_R1_220418_2132.csv (68.3 KB, 22 views)
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Cannon @ BMS Cannon @ BMS is offline
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Car: Evo VIII
Default 04-28-2022, 02:19 PM

Please post full WOT logs. Thank you!


Burger Motorsports
Home of the JB4 the worlds most popular turbocharged tuning system!

It is the sole responsibility of the purchaser and installer of any BMS part to employ the correct installation techniques required to ensure the proper operation of BMS parts, and BMS disclaims any and all liability for any part failure due to improper installation or use. It is the sole responsibility of the customer to verify that the use of their vehicle and items purchased comply with federal, state and local regulations. BMS claims no legal federal, state or local certification concerning pollution controlled motor vehicles or mandated emissions requirements. BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways. Please click here for more information on legal requirements related to use of BMS parts.
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