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As mentioned already, these car's go into limp mode pretty frequently on track with stock power and an additional/upgraded oil cooler is essential to prevent that. With the JB4 making more power than stock, you'll hit limp mode even faster. If you can't get an oil cooler before you next track day, I'd suggest setting it to map 0 which is just the stock map.
Another thing you may notice as you get faster on track is brake fade due to overheated pads. The rotor cooling on these cars isn't great and people have done everything from rotor/caliper swaps, to brake ducting to solve this issue. You'll have to decide which route makes the most sense for your budget and time.
Even with the issues, I think these can be really fun little cars at the track, so enjoy!
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2011 BMW 135i ///M-Sport, DCT
Bilstein B12 kit, Dinan camber plates, M3 front control arms, Whiteline poly RSFB, MHD Stage 1, cp-e Charge Pipe, H&R Front sway bar, BMW performance diffuser
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