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  1. #1
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    Cool BMW M4 DCT vs. BMW 135i 6MT N54 (intercooler, downpipes)

    Customer in Germany just sent this vid over having fun with a friend of his with a DCT M4 recently going 50-230 km/hr.

    135i is full weight including sunroof, DCT M4 is stock and has a passenger. 135i manages to keep up with his 6MT until he shifts and the DCT M4 catches up and edges out in front through the 6MT shift.

    135i is running our road course map for German pump gas. For road courses such as the Nurburgring we have a different approach to tuning the N54 in terms of VANOS, boost, timing and fuel. Boost is lowered from our typical street maps hitting only 15psi@5300rpm tapering to 12psi at 5800rpm and up. Due to the differences in VANOS, timing and fuel the cars make power a little differently with heat managed much better instead of turbos heating things up.

    M4s as we all know runs more boost than this road course tuned 135i. Power mods on the 135i outside the drop-in filter include just an intercooler and 3" downpipes.



    Both cars have quite a bit more left in them. On the M4 the DCT tranny is a beast, S55 motor has tons of potential and the turbos flow more than the OEM N54 turbos.

    Thought it'd be interesting to share with all the S55 stuff happening now especially since the 135i is 6MT and tuned relatively conservatively with just basic boltons, not even FBO and no E85, race gas or meth Click here to enlarge

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    iphones reallhy shouldnt record vertically but decent video nonetheless.... what would you estimate the 135 to be making at the wheel?
    09 6AT 335i Coupe M-Sport - SOLD
    Current - 16 Jeep Wrangler - Few Mods
    Looking for a n54 project e90/e82

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    Click here to enlarge Originally Posted by ChuckD05 Click here to enlarge
    iphones reallhy shouldnt record vertically but great video nonetheless.... what would you estimate the 135 to be making at the wheel?
    Somewhere in the low 400whp range Dynojet STD.

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    that tune you speak of with the diff approach wouuld be a good idea for a DD map with RBs.. interesting.
    09 6AT 335i Coupe M-Sport - SOLD
    Current - 16 Jeep Wrangler - Few Mods
    Looking for a n54 project e90/e82

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    Yep. Tested and built at the 'ring past 2 years, doesn't get better than this on the N54 road course tuning wise and we have tried 100s of revisions with different approaches there. All out street power tunes are very different for us than road course specific maps.

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    1 out of 1 members liked this post. Reputation: Yes | No
    I'm surprised the dct m4 didn't do better actually.... I agree the iPhone shouldn't even let you record vids while vertical
    Click here to enlarge
    ESS 6XX kit

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    rb 135i ~500 rwhp will smash the new m4 with 560+ rwhp from a roll..

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    Click here to enlarge Originally Posted by dzenno@PTF Click here to enlarge
    Somewhere in the low 400whp range Dynojet STD.
    good power on pump gas Click here to enlarge
    Last edited by 135idct; 07-13-2014 at 08:11 PM.

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    this looks about right, the 135 is lighter than the M4 and has only a little bit less horsepower, so let's say they were both 6mt i call even race
    '08 535xi - fbo

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    Click here to enlarge Originally Posted by dzenno@PTF Click here to enlarge
    Yep. Tested and built at the 'ring past 2 years, doesn't get better than this on the N54 road course tuning wise and we have tried 100s of revisions with different approaches there. All out street power tunes are very different for us than road course specific maps.
    Interesting! Could you explain whats the difference between the street und the road course tune? flat torque-curve and linear power?

    Are there any cons with using a road course tune on the street?

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    Click here to enlarge Originally Posted by BigHoncho Click here to enlarge
    Interesting! Could you explain whats the difference between the street und the road course tune? flat torque-curve and linear power?

    Are there any cons with using a road course tune on the street?
    most likely less boost, a little richer AFR, etc. things to keep the heat down

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    Click here to enlarge Originally Posted by BigHoncho Click here to enlarge
    Interesting! Could you explain whats the difference between the street und the road course tune? flat torque-curve and linear power?

    Are there any cons with using a road course tune on the street?
    No cons in using it on the street other than not as much midrange torque and as you indicated it is as linear power delivery as possible.

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    Click here to enlarge Originally Posted by dzenno@PTF Click here to enlarge
    No cons in using it on the street other than not as much midrange torque and as you indicated it is as linear power delivery as possible.
    Thanks Dzenno!
    So there is no richer AFR = same MPG/fuel economy as the street maps?

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    Don't forget the aerodynamics of the 135i are worse than of the M4. Which is an additional explanation why the M4 edges it out on top. Might be different with an E90 / E92 with the same configuration.
    Current: R8 V10 2013 S-Tronic, daytona grey, carbon side blades, MTM tune, Michelin PSS tires
    Gone: R8 V10 2010 manual, ice silver, grey side blades, MTM tune, MTM air filters, Michelin PSS tires
    Gone: BMW 335i Individual (Íhlins, PFC brakes, RB turbos etc.)

    Gone: Alpina B3 E46 3,3

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    Click here to enlarge Originally Posted by 135idct Click here to enlarge
    rb 135i ~500 rwhp will smash the new m4 with 560+ rwhp from a roll..
    stock nails here, not RB.

  16. #16
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    Click here to enlarge Originally Posted by bobS Click here to enlarge
    I'm surprised the dct m4 didn't do better actually.... I agree the iPhone shouldn't even let you record vids while vertical
    Both should be around 118mph trap cars so a tie sounds reasonable to me.
    Burger Motorsports
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