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M2 Technical Topics > N55 Engine / Drivetrain / Exhaust / Bolt-ons / Tuning > help, bm3 log attached, losing boost

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      08-18-2019, 07:41 PM   #23
JKen_0115
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Quote:
Originally Posted by Drop the hammer View Post
I might try to install the gfb dv+. To eliminate that possibility (a leak there at higher boost levels that may not show up at lower stock boost levels). Although if it was leaking past it, I would think it would show up at the stock 12psi as well. Cheap enough to change as I’d do it myself.
I highly suggest DV+ because it holds the boost well. The part is cheap but the labor is high since it's not easy to install. Remember to find the good shop to install that part I had a installation issue before and caused some issue. I have similar setup like you do but CTS open Intake, FTP charge/boost/inlet pipes upgrade....

Wish we can figure out the root cause. BTW, my buddy from BMW tech mentioned they have changed couple OEM wastegate under warranty...
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      08-18-2019, 08:02 PM   #24
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I was thinking of taking into dealer, however, the problem doesnít exist at stock tune boost levels, if it did exist at that level then it would for sure go to the dealer. But this seems to only occur at the higher boost levels.
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      08-28-2019, 06:24 PM   #25
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You're at 3,200ft of altitude, you aren't going to hit the boost target with 15-20% less air density. You should fill with Husky 94 vs Petro 94, it seems to be more knock resistant. I'm down to 1/3 can of boostane professional with Husky 94 on 91 OTS. Stopped using Ultra 94 last summer when it was clear it just doesn't cut it.
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      08-30-2019, 03:38 PM   #26
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Ok, so the answer to this is a bigger more capable turbo for my altitude. I can work with that I assumed at 3200 feet that the stock turbo can make 17 psi, if techinically it cannot, then that explains it.
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      08-30-2019, 04:28 PM   #27
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The stock turbo is good for 18ish psi at sea level, which nets 14-16psi for us highlanders depending on air density that day. Some people will make claims about higher than 18, but it's pushed beyond its efficiency range and makes heat and no more power.
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      08-30-2019, 09:19 PM   #28
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Thanks for the info!
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