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Loss of power after CSL map

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    Loss of power after CSL map

    I've recently sent my ECU away for the MSS54HP conversion. It's running ok with the Auto3D MAF to IAT+MAP loom with the MAP sensor Teed into the pipe off the standard air rail. Standard CSL mapping for a manual transmission.

    No hesitation, very smooth pickup and part throttle. Road manners etc. around town I can't fault.

    However, it's so slow in first and second gear. Like really slow, to the point our Renault Kadjar with 160bhp feels much faster. It revs to 8000 where the limiter comes in.

    Third gear isn't as bad and starts to improve from about 4000rpm.

    On the move in fourth, fifth and sixth it's better and I'd say it's about 85% of what it was before sending the ECU off. The pickup from 2000rpm is still quite noticeably lacking though compared to how it was, it feels like it starts to build power and torque about 3500-4000rpm.

    Is there anything I can check fairly quickly? I'm tempted to get a dyno run booked soon to see how much down on power it is.

    #2
    If it's the standard CSL tune then this will be half of it: https://nam3forum.com/forums/forum/s...or-drivability

    And the other half will be that the CSL is tuned (VANOS, Timing, etc.) for more aggressive cams.

    Honestly the best way to solve this is to reach out to Bry5on and get onto his Mullet Tune which addresses all of this stuff and is by far the best and most comprehensive tune you can run on a street car
    2005 ///M3 SMG Coupe Silbergrau Metallic/CSL bucket seats/CSL airbox/CSL console/6 point RACP brace/Apex ARC-8s
    Build Thread | Community Patch | MSS54 DS2 Tool

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      #3
      Amazing thank you! Just been through the thread you linked and it's great work from you all.

      Nice to know that my bum dyno is still accurate too and the reasons for it feeling that way.

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