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      11-22-2018, 10:17 PM   #1
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Drives: BMW 135i
Join Date: Aug 2018
Location: Sydney, Australia

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N55 135i - Cylinders pulling timing on boost

Hi guys.

My car was diagnosed eventually to have a faulty boost pressure sensor (pressure converter). This has allowed the boost pressure and target in sync now and has sharpened up the car down low and given a more linear/consistent power delivery. Very happy.

On advice I enabled the timing correction logging in MHD and much to my disappointment I am pulling timing randomly across a few cylinders. The timing gets pulled it appears as boost develops. I recently changed plugs, ungapped bosch zr whatever 33 model numbers.

I think it was pulling timing before the plugs replacement but maybe not as extreme.

Stage 1 on lower octane map, BMS charge pipe

Any obvious clues? I swapped one coil pack over but didn't get a change and petrol stations too. Also changed to higher octane stage 1.


before plugs:

I believe post plugs:

Car is driving great and I'm stoked with it. Hoping to make sure it's running

Thank you in advance,
Appreciate 0
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