JB4tech.com - International Turbo Tuning Discussion
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WagonMan WagonMan is offline
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Join Date: Aug 2021
Car: 2008 BMW E61 535xi Touring
Default Underboosting and WGDC maxed at low RPM only - 08-23-2021, 02:57 PM

Hi everyone,
I am a little new to tuning but this forum has been great to learn from. have a 2008 535xi Wagon E61 with the following mods:
- DCI
- 5in stepped FMIC
- *********
- Pure 600 turbos
- 2 inch inlets
- 1 step colder gapped spark plugs
- Boost and vacuum catch cans (with recent walnut blasting)
- JB4 and MHD pump BEF running 93 oct

I originally was overboosting after the turbo/inlet install which is pretty much resolved after adjusting the WGDC per the bigger turbo set up thread (although still some slight overboosting). Looking at my logs now, it looks like I am underboosting at lower RPM and maxing out WGDC. Above ~3K RPM my WDGC drops to 30-40% and I am on boost target. My default WG position is 80. Not sure if it could possibly be a small boost leak with the bigger turbos compensating when pressure builds up? Are my WGDC JB4 settings off? Grouped logs attached. Any help is appreciated!

Thanks
Attached Files
File Type: csv P32_M2_R5_210823_1030.csv (26.6 KB, 102 views)
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