Another one of those 'Why' questions

Discussion in 'General Discussion' started by Stratman, Mar 28, 2017.

  1. Stratman

    Stratman Hardcore MB Enthusiast

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    Why do Mercedes use superchargers on petrol engines (AMG Bi turbos excepted) but turbos on diesels?
     
  2. James Copeland

    James Copeland Hardcore MB Enthusiast

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    Thought that they'd swapped to turbos now.
    I'm sure my C250CGI is a turbo and not a supercharger.
     
  3. renault12ts

    renault12ts MB Club Veteran

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    Superchargers are crank driven...maybe it's to do with diesels being lower revving?
     
  4. MarkACLS

    MarkACLS Hardcore MB Enthusiast

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    Drive train losses. Turbo charging is slightly more efficient.

    Supercharging was used because the response time was better, less lag which was more noticeable in a petrol car versus a diesel due to the torque gap at low revs. Now with ball bearing turbos, variable vane, sequential turbocharging and electrical assistance, lag is almost gone - so now turbo charging is being used much more than before.

    Sent from my Pixel XL using Tapatalk
     
    Last edited: Mar 28, 2017
  5. SPX

    SPX MB Club Veteran

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  6. Scott_F

    Scott_F Hardcore MB Enthusiast

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    Why do some supercharged Mercedes petrol engines (I'm thinking about the M111.973/974 that first appeared in the 230 SLK and CLK etc. in the 90s) have such lacklustre performance ?
     
  7. 190

    190 Hardcore MB Enthusiast

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    I thought it odd that when they first changed from a supercharger to a turbo on the C180 the emissions and MPG were worse. So I was happy to choose the supercharger and quite like having Kompressor on the boot lid.
     
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