Tag: eaton

Mini Cooper S R53 JCW – Servicing the Eaton M45 supercharger

When I bought the Mini, it had reached the 160.000km or 100.000 miles mark. This is a milestone in the Mini Cooper S service history, because it means that you need to service the Eaton M45 supercharger (new fresh supercharger oil etc etc).

I saw the episode from Wheeler Dealers and felt confident. It was a lot of work, but fortunately it wasn’t complex. As this isn’t my daily driver, I meant I could take the time.

Mini Cooper S R53 JCW Supercharger Service

Mini Cooper S R53 JCW Supercharger Service

Mini Cooper S R53 JCW Supercharger Service

Mini Cooper S R53 JCW Supercharger Service

Eaton M45 supercharger on the work bench

Mini Cooper S R53 JCW Supercharger Service

Mini Cooper S R53 JCW Supercharger Service

The new Compressor Bypass Valve (CBV) vs the old

Mini Cooper S R53 JCW Supercharger Service

Dirty throttle body!

Mini Cooper S R53 JCW Supercharger Service

Mini Cooper S R53 JCW Supercharger Service

Finally cracked the supercharger open to allow for visual inspection of the gears (they looked good!)

Mini Cooper S R53 JCW Eaton M45 service

Mini Cooper S R53 JCW Eaton M45 service

Mini Cooper S R53 JCW Eaton M45 service

Mini Cooper S R53 JCW Eaton M45 service

I also replaced the supercharger coupler with a new oil filled nylon coupler (in red).

Mini Cooper S R53 JCW Oil Filled Nylon Supercharger Coupler


Mini Cooper S R53 JCW – Vacuum Gain System VGS Modification

As usual, the Mini Cooper S with the Eaton M45 supercharger also has a bypass valve, which helps with fuel economy and lighten the load on the supercharger during idling (for instance). On NAM (North American Motoring forum) I noticed a popular mod, which is also known as the VGS or Vacuum Gain System modification.

Basically, the VGS mod changes the way the Bypass valve is operated. From indirect vacuum to direct vacuum, allowing faster response of the butterfly valve, but also keeping it shut better so no boost is lost.

I liked it in the beginning, but it makes for a rough driving experience. So in the end I reverted and never went back. Thats why we experiment 🙂

Source: https://www.northamericanmotoring.com/forums/how-to/38268-drivetrain-operation-vacuum-gain-system-vgs.html

Changing the vacuum line routing.

Mini Cooper S R53 JCW Bypass Valve VGS Mod

Mini Cooper S R53 JCW Bypass Valve VGS Mod

Brand new Bapmic Compressor Bypass Valve (CBV).

Mini Cooper S R53 JCW Compressor Bypass Valve

Modifying the bypass valve.

Mini Cooper S R53 JCW Compressor Bypass Valve


Mini Cooper S R53 JCW – Starting a new Project

Last year, we were all affected by the pandemic. But even in such strange times, positive things happen. Like me buying a Mini Cooper S, which I wanted to drive for quite some time. I noticed one in the trim that I wanted and went ahead with it.

Looked even better than on the pictures in the advert & was fitted with extra’s like:

  • Carbon GP bumper inserts
  • Carbon handle
  • Carbon JCW hood scoop
  • Carbon Mini R56 spoiler
  • Chrono pack interior
  • LED Angel Eyes
  • LED amber indicators
  • Dechromed exterior trim
  • MSD Coilpack & HT leads
  • 17″ R113 Black / Chrome wheels

A lot of work already has been done, this will be documented as well. Stay tuned 🙂

Thanks to my buddy Joost Evers of Hobbygarage Evers for helping me out!

Mini Cooper S R53 JCW edition (2006)

Mini Cooper S R53 JCW edition (2006)

Mini Cooper S R53 JCW edition (2006)

Mini Cooper S R53 JCW edition (2006)

Mini Cooper S R53 JCW edition (2006)

Mini Cooper S R53 JCW edition (2006)

Mini Cooper S R53 JCW edition (2006)

Mini Cooper S R53 JCW edition (2006)

Mini Cooper S R53 JCW edition (2006)

Mini Cooper S R53 JCW edition (2006)

Mini Cooper S R53 JCW edition (2006)

Mini Cooper S R53 JCW edition (2006)

Mini Cooper S R53 JCW edition (2006)

Mini Cooper S R53 JCW edition (2006)

Mini Cooper S R53 JCW edition (2006)

Mini Cooper S R53 JCW edition (2006)