Hi Just Joined!! ;-) have a 535d with the usual issues

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  1. Hi Just Joined!! ;-) have a 535d with the usual issues 
    #1
    BMW Fanatic
    Car Details
    p41n3's Car Details
    Model of Car:
    535d M Sport
    Year of Manufacture:
    2005
    Transmission Type:
    Auto
    Car Body Type:
    Saloon
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    Jun 2012
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    Hi, am new to BMW have tended in the past to buy Jap or smaller german cars, the family came along so now i have become the owner of a 535d i brought the car knowing the small turbo was not actuating (with money off, never pay the asking price ) been reading into these for a while so roughly knew what i was looking for as i didnt want to get stuck in whilst clueless. so first things first it must be a Vac Hose as no oil burning, leaking etc..... so new vac hose from the vacuum box to the vacuum converter for the small turbo actuator.....turbo working

    however i ran a test on an Iphone related app because the car felt sluggish at top end boost compared to when it was broken!!
    Small turbo working - 300bhp @0.58Gs of accel
    small turbo Vac Disconected - 329bhp - 0.92Gs of accel ( accuracy of figures not important, it was a controlled test (conditions for both were the same) so i know theres a difference)

    im just wondering if anyone else has experienced this im thinking maybe the vac hose from small to big turbo actuator as when the big turbo was boosting alone (ie. small turbo actuator not opening) the boost was almost breath taking @3000-4750 now it almost flattens out just after 4000rpm
     
     

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    #2
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    mssansserif's Car Details
    Model of Car:
    335D
    Year of Manufacture:
    2007
    Transmission Type:
    Automatic
    Car Body Type:
    Coupe

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    The small turbo should be by-passed or hand over to the large turbo at high revs. So I think you are right, either it's another vac hose fault or its the actual controller.

    Worth just renewing all the vac lines and take it fom there.
     
     

  4.  
    #3
    BMW Fanatic
    Car Details
    p41n3's Car Details
    Model of Car:
    535d M Sport
    Year of Manufacture:
    2005
    Transmission Type:
    Auto
    Car Body Type:
    Saloon
    p41n3's Avatar
    Join Date
    Jun 2012
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    well im going to replace the rest of the Vac hoses tomorrow just thought id post and check incase someone could definately fault the controller, as ive read a lot of posts here and not found one with identical issues as both turbos are boosting so there must be vacuum, just unsure as to why the boost stops
    i dont think the turbo slows or fluctuates i believe it to be a lack of vacuum stoping the actuator fully opening, just need to get my head around sequential charging im only used too one turbo
     
     

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    #4
    BMW Fanatic
    Car Details
    mssansserif's Car Details
    Model of Car:
    335D
    Year of Manufacture:
    2007
    Transmission Type:
    Automatic
    Car Body Type:
    Coupe

    Join Date
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    Scotland
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    I'm guessing that the small turbo isn't being bypassed and so is causing a restriction to the larger turbo?
     
     

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