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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > Regional Forums > UK > UK Technical Forum > Strange boost issue



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      06-01-2018, 05:38 PM   #1
gaz_ball
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Drives: E91 335d
Join Date: Jun 2016
Location: Norwich

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Strange boost issue

Evening,

Had my E91 335d in to the garage last weekend to have DPF deleted, swirl flaps blanked, EGR deleted & a new intercooler fitted along with a GBW remap. It made good stock figures before any work was carried out but when they had it on the dyno after the remap it only made an extra 8bhp (!). All 335d's mapped at this particular garage using GBW maps have made between 350-375bhp so something is amiss. The boost logs from the mapping session (see attached) show a difference/lag between what the ECU is requesting (bottom) & the actual (middle) with quite an obvious jump between the high pressure turbo & low pressure turbo. We have a few ideas of where to start looking and it needs to go back to the garage to hopefully find the issue but I wanted to ask on here in case anyone has seen or experienced similar symptoms.

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