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Nanometer Nanometer is offline
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Car: 335i, 2009
Default Loss in Boost Post Shift - 02-14-2019, 12:43 PM

I have a stage 1 JB on my N63 X5. And when I drive the car hard in drive mode everything works fine, but when I use manual mode for shifting, I have a complete loss in boost pressure and it takes a second to build back up again. Any Idea what could be causing this? I seem to be limited to Drive and S mode only, which is disappointing since I have paddles.. Thanks for any help!


335i E90 2009 ///M Sport Auto
Mods: | Wagner Intercooler | MeowPipe | Meth-Trunk | JB4 | Pump_Back_End_Flash | Fuel-it! Stage 2
Drivetrain--------ForgeStar F14 Wheels 18" (245 & 275 PS4) | XHP L3 Transmission Flash | Wavetrac LSD
Suspension-------KW V3 Coil Overs| M3 RSF Bushings and Dif Bushings | H&R Sways


X5 50i 2013 ///M Sport
BMS Stage 1

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Nanometer Nanometer is offline
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Posts: 591
Join Date: Jan 2014
Car: 335i, 2009
Default 02-15-2019, 03:03 PM

Happens when doing full throttle and up shifting at 5K or 6K. Full throttle and short shifting at 3K has no problem in terms of losing boost.


335i E90 2009 ///M Sport Auto
Mods: | Wagner Intercooler | MeowPipe | Meth-Trunk | JB4 | Pump_Back_End_Flash | Fuel-it! Stage 2
Drivetrain--------ForgeStar F14 Wheels 18" (245 & 275 PS4) | XHP L3 Transmission Flash | Wavetrac LSD
Suspension-------KW V3 Coil Overs| M3 RSF Bushings and Dif Bushings | H&R Sways


X5 50i 2013 ///M Sport
BMS Stage 1

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Nanometer Nanometer is offline
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Posts: 591
Join Date: Jan 2014
Car: 335i, 2009
Default 02-16-2019, 07:17 PM

So I found out that it's pretty common, it's called post shift Bog. I just wish someone had a clear solution.


335i E90 2009 ///M Sport Auto
Mods: | Wagner Intercooler | MeowPipe | Meth-Trunk | JB4 | Pump_Back_End_Flash | Fuel-it! Stage 2
Drivetrain--------ForgeStar F14 Wheels 18" (245 & 275 PS4) | XHP L3 Transmission Flash | Wavetrac LSD
Suspension-------KW V3 Coil Overs| M3 RSF Bushings and Dif Bushings | H&R Sways


X5 50i 2013 ///M Sport
BMS Stage 1

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