[dmcd004]

Hey guys, I have an 08 335i. It was running MHD 2+ e30 for a while and pulled hard, I flashed 2+ e50 and filled it with e50 and ever since it's been limiting boost at 4.8-5 psi. I've reflashed 2+ e50, flashed a custom CD919 e50, flashed back to 2+ e30, flashed to stage 0 mhd all of which hard limit boost at 4.8-5 psi. I'm really at a loss as to what to check and what to do, it makes boost clean it just refuses to push past 5.

[ky0u]

Are there any codes thrown that you can see in MHD

[whyzee125]

Have you tried removing MHD entirely or using the tune you used before? I'm positive you have a boost leak or dying turbos but this would rule out a tune/flashing issue if it did come back. Go WOT for 5 seconds in one gear and see if you throw a 30ff.

[dmcd004]

Originally Posted by ky0u

Are there any codes thrown that you can see in MHD

None, only codes are for my headlights

[dmcd004]

Originally Posted by whyzee125

Have you tried removing MHD entirely or using the tune you used before? I'm positive you have a boost leak or dying turbos but this would rule out a tune/flashing issue if it did come back. Go WOT for 5 seconds in one gear and see if you throw a 30ff.

I have not tried entirely removing MHD, dying turbos is 100% a thing being as they're stock and have been pushing between 18-20 psi and are at 106k miles but they still make boost clean and instantly it jus refuses to target above 5, as for flashing back to the old tune yeah I tried that. I've flashed stage 0, 2+ e30, 2+ e50, and a custom CD919 e50 all limiting at 5. What confuses me most is that it was running perfect until I flashed 2+ e50 and now no matter what happens it doesn't build boost. Literally from building 19.5 then 20 minutes later acting like it's broken

[whyzee125]

Originally Posted by dmcd004

I have not tried entirely removing MHD, dying turbos is 100% a thing being as they're stock and have been pushing between 18-20 psi and are at 106k miles but they still make boost clean and instantly it jus refuses to target above 5, as for flashing back to the old tune yeah I tried that. I've flashed stage 0, 2+ e30, 2+ e50, and a custom CD919 e50 all limiting at 5. What confuses me most is that it was running perfect until I flashed 2+ e50 and now no matter what happens it doesn't build boost. Literally from building 19.5 then 20 minutes later acting like it's broken

Somehow I missed that it was only TARGETING 5psi. In that case I can't imagine it's your turbos but I really don't know what would cause that. IMO try removing MHD entirely and installing a stock file to see what it does. Has to be a flashing/MHD issue I'd think, esp if it started during a flash.

[wheela]

Is it true the issue is with the boost target vs. just the actual boost attained?