N54Tech.com - International Turbo Racing Discussion
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livealegacy livealegacy is offline
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Join Date: Mar 2019
Car: 2017 340xi
Default 340xi with bad launches - 03-20-2019, 06:44 PM

Hello,

I have a 340xi with a JB4 w/ the ff and ewg. The supporting mods I have on the car are a 4" turbo back full AWE exhaust (wordered weirdly due to blocked words). Im running on 93 shell gas down here in FL.

When I launch the gear any any map besides map 0 the car feels like its limiting boost till high RPM's where there is a noticeable difference in acceleration. Ive included some maps below of 3rd gear roll ons and launches on Map 0, 3, and 5. I am hitting the track friday and i want to do better then the 12.47 and 1.8 60'.
Attached Files
File Type: csv 2019_03_20 M0 Dig.csv (8.1 KB, 83 views)
File Type: csv 2019_03_20 m0 roll.csv (9.4 KB, 72 views)
File Type: csv 2019_03_20 M3 dig.csv (10.6 KB, 77 views)
File Type: csv 2019_03_20 m3 roll.csv (8.3 KB, 80 views)
File Type: csv 2019_03_20 m5 dig.csv (9.6 KB, 80 views)
File Type: csv 2019_03_20 m5 roll.csv (7.8 KB, 77 views)
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Andrew1810 Andrew1810 is offline
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Car: M140i
Default 03-21-2019, 08:21 AM

Were you launching with traction control off ?

My guess is throttle closures were happening as a result of poor traction when launching ? I could be wrong though, hopefully someone with further knowledge can provide more insight.

A LSD should improve that.
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livealegacy livealegacy is offline
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Car: 2017 340xi
Default 03-21-2019, 08:27 AM

Itís AWD. It doesnít sound like itís spinning the tires.

Iím launching in Sport+ with the shifter in Sport, and using BMWís Launch control.
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