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

[Arioli, Frederick]

There was an Edelbrock water injection unit available awhile back (I
still have the parts) that purported to allow one to substitute regular
for
ethyl (the high octane).  I don't think it had anything to do with the
then available leaded gasolines, but was based on a thermal delta t
argument.
The only drawback was if one didn't install the one-way check valve,
then conceivably when parked with the nozzle lower than the water
reservoir,
water could drain into the engine.  It was most likely a five point
increase in octane (87 to the then available 92).  Go figure :-)
 
Fred Arioli
new '90 560sec owner  
 

-----Original Message-----
From: mbcoupes-bounces at mbcoupes.com
[mailto:mbcoupes-bounces at mbcoupes.com]On Behalf Of Shayegan, Richard
Sent: Thursday, April 27, 2006 3:46 PM
To: Mercedes Coupes Mailing Lists
Subject: 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.

  _____  

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 <mailto:dan at landiss.com>  
To: Mercedes Coupes Mailing Lists <mailto:mbcoupes at mbcoupes.com>  
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,
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