[W126 Coupe] 560 SEC Supercharger Upgrade Anyone?

[jack emery]

Thanks, Alexander. Is the make of the supercharger important.? Sprintex are popular in OZ. Any idea how much horse power I could expect from a Euro 420/1986, with standard emission controls? Happy New Year to you & yours  jack.
  ----- Original Message ----- 
  From: Alexander Hochhausl 
  To: 'Mercedes Coupes Mailing Lists' 
  Sent: Friday, January 05, 2007 9:30 AM
  Subject: Re: [W126 Coupe] 560 SEC Supercharger Upgrade Anyone?


   
  Hi Jack,

   

  Well, I am no expert. Attached is a pic of what I did. I guess as long as you are 9:0 compression or less, can fit this in, tap into your oil pressure line (by the oil pressure sending unit is a good place), add an oil return line to oil pan, enrich the fuel distributor output, and find a pulley with which to drive the unit, you are home free! Sorry, did not mean to be funny, but those are pretty much the steps. No magic, just a few tricks. I don't see why not though. Take a look at the picture and see if you can envision this fitting - I imagine the engine compartment clearances are similar. Any questions let me know.

   

   

  -----Original Message-----
  From: mbcoupes-bounces at mbcoupes.com [mailto:mbcoupes-bounces at mbcoupes.com] On Behalf Of jack emery
  Sent: Wednesday, January 03, 2007 3:33 AM
  To: Mercedes Coupes Mailing Lists
  Subject: Re: [W126 Coupe] 560 SEC Supercharger Upgrade Anyone?

   

  Would it be feasible to supercharge a 420 SEC 1986 model       Jack OZ

    ----- Original Message ----- 

    From: Alexander Hochhausl 

    To: 'Alexander Hochhausl' ; mbcoupes at mbcoupes.com 

    Sent: Tuesday, January 02, 2007 10:00 AM

    Subject: Re: [W126 Coupe] 560 SEC Supercharger Upgrade Anyone?

     

    Sorry, can you change that to Dec 31st? Oops.

     

    -----Original Message-----
    From: Alexander Hochhausl [mailto:plustech at optonline.net] 
    Sent: Monday, January 01, 2007 8:24 PM
    To: 'mbcoupes at mbcoupes.com'
    Subject: 560 SEC Supercharger Upgrade Anyone?

     

    Hi All,

     

    This is my first time posting a message. I am an "Old School" Motor-Head who appreciates the "Finer Cars in Life", maybe older cars, but it's tough to be the original.

     

    Hence I own an 89' 560 SEC for 3 years. Barely still can any of the modern new cars touch the luxury, performance and reliability of this Model (all things you all know anyway), but I always wondered: "What if!" & Why is the upper left side of the engine compartment so empty - looks like a perfect place for a Super-Charger.

     

    So in my Motor-Head way I added a Vortex S-1 Supercharger to my SEC during the course of this year. Keeping my promiss to my wife to finish this project this year, I finally took my first test run last night (Dec 31st), following which I called all my friends, not to wish them Happy New Year, but to brag about my experience! My wife could tell the result by the look on my face when I returned.

     

    In my best (conservative) estimate I thought the performance gains would be moderate. I've always thought the 560 has good performance with much potential, but now I have exploited the potential and it is an absolute Animal! I have not have not had it Dyno'ed but from my experience and calculations I think it is pushing around 350-375Hp on the first run. With some tuning (and a more free flowing exhaust) I think I can push the 400 Hp mark. The torque gains from 1000-4500 RPM are astonishing - there is no Turbo-type lag - just hit the gas and the car responds instantly - and smooth - it is really amazing! I had the biggest __it eating grin when I came back from my test ride. To be honest, above 4500 the stock ignition does not compensate enough to avoid detonation (at 8 PSI boost) so I still have to figure out how to adjust that. I added a switch (blue item in the engine pic) to automatically override the emission controls and provide an (inside cabine) user-adjustable fuel enrichment during boost operation to help keep detonation down and provide maximum power - so simple and works fabulously. 

     

    So the question now is who else is seriously interested in this type up "real" performance upgrade. I've seen all the garbage products out there adding 5 hp here, 10 hp there. I spent 12 months (on and off when life, work and family would let me) making and remaking parts until I got Form, Fit and Function just right. Being an engineer by profession I documented everything I did and parts I made. 

     

    I don't want to break any fan-club rules, but I am only trying to see if there is any favorable quantity of people who are seriously interested in this project. I would be willing to either A) Sell just the paper plans of what to build, how to install it, where to get the parts, or B) sell the parts and plans (minus the supercharger - you can get this yourself without me bothering with it). I am not planning on making a ton of money on this - maybe break even with my time and $ investment (and take my very understanding wife out to dinner). Honestly this is fairly simple "do-it-yourself project" for anyone with a decent set of tools (drill press, chop saw and files) and mechanical aptitude (one picture of the hardest fab-part is attached - but I made it myself with a drill press and a-lot of patience). Once the remaining brackets are made it is a simple bolt-in installation along with some plumbing and wiring. I am not going to make any guarantees about the longevity of your cars' drive-train because I know this is a lot of strain on the stock drive-train - but only when exercised - and will depend on your driving habits. 

     

    Some pics are attached for your reference (sorry, they are Work-In-Progress and still need to be cleaned up & the engine pic has raindrops on it). I know I do not have the nicest SEC, but except for the 600 conversion I saw on the Web-Site, I bet it is one of the fastest! 

     

    Next I am eying my wife's 380 SLC - will she notice the difference? Hmm..

     

    Thanks for your time and let me know. Send emails to plustech at optonline.net. Please put "SEC Supercharger" in the subject line - it will go to a special mailbox so it is not deleted as spam. Feel free to e-mail me with questions. I have a very busy schedule, but will try to reply ASAP, may take a few days though.

     

    Hasta-La-Vista, Baby!

     

    Alexander Hochhausl, PE

     

    89-560 SEC

    81-380 SLC


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