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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > B58 Turbo Engine / Drivetrain / Exhaust Modifications > Can someone tell me if this looks okay?
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      06-16-2021, 03:18 PM   #1
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Drives: 2016 BMW 340i XDrive
Join Date: Jun 2021
Location: Midwest, USA

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Can someone tell me if this looks okay?

I have a 2016 BMW 340i xDrive (B58) with a catless downpipe currently running BootMod3 Stage 2 E30 Map.

I'm running ~E30 but not 100% sure of the exact ethanol content without an inline ethanol gauge.

Can someone take a peek at these logs and tell me if I'm about to blow this sucker up?

To me it looks like it's running a little lean but I'm not sure exactly what an acceptable AFR range is for the B58 engine is.

Thanks in advance!

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      06-16-2021, 07:11 PM   #2

Drives: B58 6MT
Join Date: Feb 2017
Location: CO -> TX

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I highly recommend getting a $15 E85 test kit from Amazon and measuring the actual ethanol content from the pump. From there, you can use an app or do some matrix reduced row echelon form to see how much "E85" and pump you need. I'd target ~E32/E33 to have a little bit of tolerance built-in.

And the log doesn't look bad! Btw, we have a thread dedicated for logs for fellow members to look at. Would recommend posting your future ones there.
2016 340i xDrive 6-speed
BM3 Stage 2+ E30 | TU HPFP | CG DS-1 5" catted DP | BMS intake | AWE catback | 335is/550i clutch | RK Autowerks intake manifold/intercooler | CSF heat exchanger
DAW FlowMax turbo | Orange M Perf Brake Kit | KW Street Comfort coilovers | GTS taillights V2 | Andream CarPlay/AA

Last edited by G.Newt; 06-16-2021 at 07:20 PM..
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