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BMW 3-Series (E90 E92) Forum
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Overboost hell!!!
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| 05-12-2022, 07:46 AM | #1 |
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Boosty
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Overboost hell!!!
Hey guys, I'm completely stumped here. Maybe someone can help.
2010 335i N54 JB4 with backend flash by Phuong Khac Vu 3.5 map sensor with burger harness VIV 19t Amazon turbos adjusted for the wastegates to be shut at -6in hg Relocated inlets Upgraded outlets 7inch stepped intercooler The issue I'm having is the car continues to overboost hard to about 25psi. The tuner says the waste gates are not opening. I tried putting a different set of boost solenoids on, same issue. I checked the vacuum lines 100 times. They go from the vacuum pump over the engine to the right side port on the boost solenoid. Then the left port goes to each waste gate and they are Tee'd. I'm at a complete loss. I don't know what else could cause this overboost issue.
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'08 335i AT Alpina Flash~Rob Beck Turbos~Full kittyless exhaust~DCI~5" Intercooler~Chargepipe BOV~BMS meth kit
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| 05-13-2022, 10:49 AM | #2 |
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Major
 
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Drives: 09 E92 335i 6MT
Join Date: Nov 2020
Location: Westminster, Maryland
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Are the actuator rods hitting your downpipes v-bands?
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09 E92 335i 6MT / Alpine White / Coral Red / VRSF 7.5" / VRSF DCI / VRSF Catless Downpipes / VTT Charge Pipe / Turbosmart RacePort Gen V / RB OEM Billet Turbos / CD919 Custom Tune / Bilstein PSS9s
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| 05-17-2022, 12:12 PM | #3 |
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Captain
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Are you running the boost solenoid bypass from that other thread
 It really does sound like there is a physical restriction to one or both of the wastegate actuator rods like Dave suggested. If it is an actuator rod issue, your turbos would continue to overboost with the vacuum lines disconnected. I would try that as a test.
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2008 335xi 6MT - 16T China Turbskies - eBay FMIC, DP & CP - VRSF Inlets - SSR DCI's - Walbro 450 LPFP - RFP e85 Tune
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| 05-17-2022, 01:25 PM | #4 |
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Boosty
56
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Hey sorry I didn't update the thread.
The car had an original JB4 in it. Deleted that and went full MHD custom tune and she's a monster!!
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'08 335i AT Alpina Flash~Rob Beck Turbos~Full kittyless exhaust~DCI~5" Intercooler~Chargepipe BOV~BMS meth kit
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