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Junior Member
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Posts: 39
Join Date: Jun 2015
Car: 08 335i e90 6mt
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Chasing down surging issue from 3000-4000 rpm -
11-24-2016, 12:00 PM
I'm chasing down a surging issue I started getting a few weeks after installing dp's. So far I've verified that the grey wires are in the passenger side pipe, that my diverters appear to be working (tested to 20psi with a syringe and air compressor. Also leak tested using the setup where you put a cap and a cap with an air fitting in the intakes. I'm getting a 2aaf code. I'm curious if this would be injectors? lpfp? I would not mind upgrading the lpfp anyway to more easily run e85. I haven't done that yet but would like to. Here are a few logs. I noticed throttle gets crazy and lpfp is a tad low, but I'm new to this but not sure. My afr looks terrible when the surges happen. The car was slow to start today, but normally isn't too bad. I've had a lean message and limp mode from the jb4. I'm running the bms intake, vrsf charge pipe, and vrsf *********. Regular 93 octane. I've walnut blasted the car about 8k ago. 08 335i 6mt, 90k on the car. Let me know what you guys think I should check next. I'm leaning lpfp, but need advice. Thanks! Happy Thanksgiving!
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Junior Member
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Posts: 39
Join Date: Jun 2015
Car: 08 335i e90 6mt
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11-25-2016, 07:21 AM
Also tested the boost control solenoids and they pull 27hg vacuum.
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Tuner
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Posts: 5,673
Join Date: Nov 2008
Car: 2009 335i AT
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11-25-2016, 12:27 PM
DP will change how the turbos make boost at low throttle settings.
Try changing.... generally lowering .... the in dash options 11 & 12.
Burger Motorsports
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It is the sole responsibility of the purchaser and installer of any BMS part to employ the correct installation techniques required to ensure the proper operation of BMS parts, and BMS disclaims any and all liability for any part failure due to improper installation or use. It is the sole responsibility of the customer to verify that the use of their vehicle and items purchased comply with federal, state and local regulations. BMS claims no legal federal, state or local certification concerning pollution controlled motor vehicles or mandated emissions requirements. BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways. Please click here for more information on legal requirements related to use of BMS parts.
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Junior Member
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Posts: 39
Join Date: Jun 2015
Car: 08 335i e90 6mt
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11-25-2016, 12:57 PM
I'll give that a try when I get back from the inlaws on Sunday. Thanks!
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Junior Member
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Posts: 39
Join Date: Jun 2015
Car: 08 335i e90 6mt
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12-02-2016, 10:00 PM
It looks like that mostly did the trick. I do feel like it really boosts more than pedal input at 3-4K, but I can live with that. I am noticing that when I am going wot in second and shift to third it falls on it's face with no boost for a second though. Would a back end flash help? I have a bavtech cable, so is there a downside to flashing that way?
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