[W126 Coupe] Fuel Requirements or How Can I Adjust 1989 560SECTo Use 87 Octane

[Bruce Mendel]

Two reasons...one, what Richard said, which is that it winds up costing more than premium.

Two, and most importantly, read the bottle carefully. The "point" they talk about is actually a tenth of a point! So when they say "raises octane eight points", they mean from 89 to 89.8. What a rip-off, and hardly anyone knows this little tidbit.

If you want good stuff, get additive from www.torco.com, or even better, go to Sherwin Williams or any paint store and buy a five gallon pail of Toluene. 114 octane, and boy does it make a difference. I used it all the time in turbocharged track cars.....much cheaper than race gas. This is the stuff, back in the '80s that was the primary ingredient in the Formula 1 "rocket fuel" they used to achieve 1500HP from 1.8 litre turbo motors running 60 lbs of boost!

Bruce
  ----- Original Message ----- 
  From: Shayegan, Richard 
  To: Mercedes Coupes Mailing Lists 
  Sent: Thursday, April 27, 2006 6:46 PM
  Subject: [Norton AntiSpam] RE: [W126 Coupe] Fuel Requirements or How Can I Adjust 1989 560SECTo Use 87 Octane


  Which is more than the price difference between low grade and high grade.



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  From: mbcoupes-bounces at mbcoupes.com [mailto:mbcoupes-bounces at mbcoupes.com] On Behalf Of mavris2 at comcast.net
  Sent: Thursday, April 27, 2006 7:30 PM
  To: Mercedes Coupes Mailing Lists
  Subject: Re: [W126 Coupe] Fuel Requirements or How Can I Adjust 1989 560SECTo Use 87 Octane


  Why cant one just add octane boost to the fuel?  They have stuff for 5bucks that claim a 10 point increase in octane.  Any thoughts??


  ----- Original Message ----- 
    From: Dan Landiss 
    To: Mercedes Coupes Mailing Lists 
    Sent: Thursday, April 27, 2006 3:08 PM
    Subject: Re: [W126 Coupe] Fuel Requirements or How Can I Adjust 1989 560 SECTo Use 87 Octane


    XKEOTS at aol.com wrote: 
      Is there any way to make our 560's run or 87 octane?


    There is a 750 ohm resistor (US models) inside a black plug in the wiring harness up near the brake booster. It contributes to the computer's decision on spark advance. For other markets, an adjustment can be made as follows:

          Setting Ohms Retard Octane 
          S 10000 0 98 
          2 2400 2 95 
          N 1300 4 93 
          4 750 6 91 
          5 470 8 89 
          6 220 10 87 
          7 0 
         
         

    But I gotta tell ya', with 470 ohms in there it is going to feel sluggish!

-- 

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"Progress is brought about by doubt, not accord."  --John Amos Comenius, 17th century educator
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