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codesx codesx is offline
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Posts: 946
Join Date: Feb 2018
Car: 2008 335i Vert (E93, N54)
Default Waste Gate Duty Cycles, CAI vs DCI - 10-22-2018, 09:41 AM

Hi all,

Mods in signature for context.

I noticed that on full 3rd gear pulls (2k to 7k), my WGDC were an average of 8 lower after going from the Stock Intake to the Ultimate Racing Cold Air Intake. (similar ambient air temps, though I do not recall the humidity)

I'm wondering if the same is observed when moving from the Stock Intake to the DCI.

I speculate the WGDC are lower as there is less restriction on pulling air in... so the turbos don't have to work as hard to meet target.


Truthfully, I'm thinking to go to DCI (if I get an upgraded FMIC) for convenience of working under the hood. The UR CAI requires the driver-side tire and cowling to be removed to check/replace the filter. The installation also required cutting of a brace inside the engine which I'm not excited by or aware of prior to it being installed.

2008 335i Convertible, E93, N54, A/T (200,000+ km)
Wheels: 322 | Tires: R.275/35r18, F.245/40r18
TUNE: JB4/Trebila | 24 PSI | 100% Meth via dual CM5 | 94 Octane
BMS: JB4, Map 6 | WMI | 5" FMIC | OCC | DCI | Cowel Filters
RB: Inlets | PCV Valve
VRSF: DiPis | CP
xHP Stage 3
NGK-97506 @ .020

2018 - A/T Replaced | Ign Coils | Walnut Blast
2019 - Index 12 Injectors | VCG | OFHG & O-rings | TStat
2020 - OPG | Battery | IBS | Water Pump | Plugs | Alternator
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treehouse treehouse is offline
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Car: 135i
Default 10-23-2018, 09:52 AM

Get the DCI. No reason not to.
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