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monsterbuck1974 monsterbuck1974 is offline
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Join Date: Apr 2019
Car: 2011 BMW 135i M sport n55
Default N55 low boost. Please help! - 04-28-2019, 07:56 AM

Hi new to forum. I have a 2011 135i m sport N55 DCT
I am running an MHD e30 tune and have a Fmic, boost pipe, new plugs and coils, cateless down, and a K&N drop in. I have changed the boost control valve, installed a GFB DV+, and adjusted my waste gate as per 6inhg specs.

I’m fairly certain I don’t have a boost leak because I can’t hear anything and in my logs as well as the boost being 5-8psi lower than target most of the time the MAF is significantly lower than requested MAF. Very seldom does it hit and maintain close to requested boost but on occasion does. Also when I run a lesser tune it still runs about 5-8psi lower than target. So with the e30 it will hit 17 and tapper to 9 when target is 18.8 tapering to 14 and with a stage 2+ I run 15 and taper to 10 when it’s target is 17 tapering to 15.

I’m out of ideas please help. I can post logs of any numbers needed to help please let me know what kind of logs are needed to help. Thanks so much

Brian

Last edited by monsterbuck1974; 04-28-2019 at 09:17 AM..
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