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    • The story of how a BMW Boost Addict went from an ESS supercharged S62 E39 M5 V8 to a 707 wheel horsepower S52 inline-6 Turbo swapped E39 M5

      This build began due to the fact that, like many, I am a horsepower addict. Although I've owned and built many cars, the E39 M5 has been my overall favorite, honestly. My previous M5, a Lemans Blue 2001, was driven hard every day i owned it, and was a great car even with no modification. BUT, eventually ~330whp wasn't doing it for me anymore.

      I ended up supercharging the car, and enjoyed the extra 200whp thoroughly. The best numbers I ever made out of my ESS supercharger kit, @ 9psi and water/meth injection, was 546whp/453ft-lbs.






      But then eventually I got used to it, and I decided it wasn't enough. After a lot of careful consideration, I determined that even though the S62 is a phenomenal engine, it wasn't the proper power plant for me to attempt to push more and more power out of. Building that engine would've been very costly, and frankly I'm not convinced the block has enough structural rigidity to handle very high torque levels. So I ended up parting out the car and returning it to stock, with intentions of buying something else that had greater power potential. After a few months of driving the car without the blower, I was going through boost withdrawal. So in an effort to deal with my boredom, I decided to do a nitrous setup in the car to temporarily deal with my speed addiction. I ran a two fogger, 150 shot, and enjoyed roasting the tires at a push of a button for a little while. The most power I got out of that setup was 460whp/574ft-lbs.


      Eventually my M5 was sold, and after owning a M52 swapped E30 M3 for a while, I found myself happily back in another E39 M5.


      My original intent was to keep this M5 stock, and enjoy a beater turbo E36 that I owned as my fun, go-fast car. But after some time, I realized I was driving my terrible condition, smoking, turbo E36 exponentially more than my clean, comfortable, M5. So I started brainstorming…

      Why not combine the two? As my knowledge of the M5x line of engines and their power capabilities grew, I was increasingly drawn to the idea of replacing my tired S62 (the motor was in need of some refreshing) with a fully-built S52. I felt that I could combine the engine I really wanted, along with the chassis I really wanted, and then I'd have the best of both worlds. Essentially, that's what I did. I was able to sell the S62, trans, harness and ecu, and take the same amount of funds and buy a brand new, fully built S52, and Getrag 420G 6 speed trans. I took all the turbo components off the E36 and parted out the rest of the car. Then, I let the fun begin...






      Engine Details:

      S52, 8.5:1 compression
      CP pistons
      Eagle rods
      Full Supertech valvetrain (+1mm intake, Inconel exhaust valves)
      SS O-ringed block, with matching receiver groove in cylinder head
      11mm ARP 2000's
      ATI Damper






      Other Details:

      Precision 6266 CEA, T3 .82 a/r Turbine housing
      SPA Manifold
      3.5" Exhaust
      4" Intake
      Tial 38mm waste gate
      Tial 50mm BOV
      80lb Siemens Injectors
      Walbro 400 Fuel pump
      Devils Own Direct Port Water/Meth Setup
      UUC Twin Feramic Disc Clutch Kit


































      -My biggest goals with the build were to build a very responsive turbo kit, with a broad power band, and with as much torque as possible. Choosing the 3.2L was a great decision. I'm also running a custom 3.62 M5 differential. The combination of displacement and gearing make this 4100lb sedan accelerate and feel more responsive than my 3100lb e36 with the boosted 2.8L M52. I am very very pleased with the driving dynamics of the car overall. Far more torque and power than my supercharged S62 ever could deliver, with the only sacrifice being the loss of the immediate throttle response that the S62 is known for. But believe me, once the car comes into boost, there are absolutely no regrets!

      -The engine is tuned on a factory e36 M3 OBD2 ECU, by Nick G of Technique Tuning.

      The first time moving under its own power:


      Here is a brief cruising video to enjoy the wonderful harmony of the inline 6 and turbo sound:


      Here is a 55-145mph pull at ~650whp:


      -So far, the highest peak power numbers to date are 707whp/708ft-lbs:


      Unfortunately, I was having some electronic boost control issues, which left the overall power band not quite as smooth is some previous graphs, but there will be plenty more results to come! I'm looking forward to sharing progress with the car, as well as plenty of racing footage this upcoming season. Thanks to all for the interest!

      This article was originally published in forum thread: E39 M5 + Turbo S52 started by Omni View original post
      Comments 12 Comments
      1. Sticky's Avatar
        Sticky -
        @Omni simply great stuff, much respect.

        I edited your post for formatting purposes and spacing to make it a little cleaner.

        Very nicely done! Awesome car man.
      1. DBFIU's Avatar
        DBFIU -
        Great job! Love it!
      1. Sticky's Avatar
        Sticky -
        Threads like this are some of the best stuff on this site. Just awesome to see.
      1. Omni's Avatar
        Omni -
        Here are a few more pics! Thanks for all the interest!

        Click here to enlarge
        Click here to enlarge
        Click here to enlargeClick here to enlargeClick here to enlarge



        ^Disregard AFR gauge, Reading was not accurate.
      1. Sticky's Avatar
        Sticky -
        It's a sick ride. Almost sad having to ditch the S62 but no denying the results in doing so.
      1. Omni's Avatar
        Omni -
        Whoops, I accidentally posted the same stuff a second time. Sorry about that. The S62 is a phenomenal engine. It just was never designed to handle 700+ft/lbs. I dreamed of a turbo S62 for years, just like many others, but since my budget isn't endless it was smarter for me to choose a proven platform.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Omni Click here to enlarge
        Whoops, I accidentally posted the same stuff a second time. Sorry about that. The S62 is a phenomenal engine. It just was never designed to handle 700+ft/lbs. I dreamed of a turbo S62 for years, just like many others, but since my budget isn't endless it was smarter for me to choose a proven platform.
        The M62 actually makes more sense to boost than the S62 as BMW obviously took displacement as far as they could for max NA power to the detriment of aftermarket power handling capability.
      1. Omni's Avatar
        Omni -
        Even starting with a M62 would still require sleeving the block for high power levels, and you'd still be flirting with block structural integrity issues at high torque levels.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Omni Click here to enlarge
        Even starting with a M62 would still require sleeving the block for high power levels, and you'd still be flirting with block structural integrity issues at high torque levels.
        True but you would have more material to work with should you really want to go that route.
      1. m5james's Avatar
        m5james -
        Awesome thread. I've got a sleeved (www.bavengine.com) M62 block in my 740iL w/ a 6spd swap, but I still wonder about it's boost handling capabilities. Since the M62 is supposed to be able to handle more boost than the S62, can the same thing be said about the M52 (my mom has a 328 I'm going to take off her hands one day) vs the S52?
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by m5james Click here to enlarge
        can the same thing be said about the M52 (my mom has a 328 I'm going to take off her hands one day) vs the S52?
        Well the S52 bore x stroke is different than the M52 although they both have the same basic iron block. The M52 and S52 are closer in capability than the M62 and S62.
      1. R3lentless's Avatar
        R3lentless -
        Perfect e39