Originally Posted by Texas993

Where do you live that you can get 93 consistently?

Originally Posted by AMGC43

I'm not following this. WHat is the SDS? a genuine MB scanner that let you play with few factory set/tune for the ECU? Or is a tuner device (which I don't beleive it is) ?

The StarDiagnose has this option as well? If so, under what group can I found it?

Thanks

Originally Posted by 99C43n843

I live in Charleston, Sc. I didnt think there was a shortage


Posted from Mbworld.org App for Android

Originally Posted by 99C43n843

so I figured id share this with everyone. I had read on a way earlier thread about someone getting there fuel setting set from default to 93 octane fuel. so today we were slow and I pulled my car in and hooked it up to the sds (ran short test while I was there and good to say all checks..which is what you want to see). went into the M.E control unit and went into control unit adaptations. went to ignition and found the settings of the fuel octance. all of our cars are programmed on the "default" setting for "countries with poor fuel" there were four settings to pick from...default, 93, 91, 89. I set mine to 93 of course. appreantly the timing is retarded on other settings to compensate for poorer fuel so that the knock sensors wont trigger falsely. so im not sure if changing it to 93 will give any real advantages but who knows. will let everyone know if anything changes.


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Originally Posted by thepinoc

Would you happen to know what "default" is set to run on (for octane)? The manual & gas lid state to run 91 octane at minimum, but I'm sure MB engineers took into account there would be those few people who would ignore the recommendations; henceforth why I will assume that "default" is 87.

Originally Posted by speed43

Pease keep us posted, would be nice if your car picks up some power. Btw, I have a question I like to ask since you're a tech. Would it be ok if I ask you to email me please? If yes it's gobulls1234@(gmail.com) thanks.

Originally Posted by benzslo

You just detuned your car by putting it to 93. Those figures are RON octane. Do a Google search, 93 RON is about the same as our 89. Default setting is actually 95 RON. By setting it to 93 you successfully detuned your car. That's why in that window it says "For countries with poor fuel quality".

Trust me, I'm a dealer tech and did the same thing on my c43 and ml55 the first day I got each. When I found out the real tr
uth, I switched it back... very noticeable difference! They both felt like a new, way faster car after putting it back.

Originally Posted by benzslo

You just detuned your car by putting it to 93. Those figures are RON octane. Do a Google search, 93 RON is about the same as our 89. Default setting is actually 95 RON. By setting it to 93 you successfully detuned your car. That's why in that window it says "For countries with poor fuel quality".

Trust me, I'm a dealer tech and did the same thing on my c43 and ml55 the first day I got each. When I found out the real truth, I switched it back... very noticeable difference! They both felt like a new, way faster car after putting it back.

Originally Posted by 99C43n843

im a dealer tech too. just read the whole ron to octance conversion thing online. good info. didnt know that. and I see what you are saying. but my only question is how did you find out what the default # was. bc when I go into my sds its just says 93, 91, 89, default. just curious to where you found 95 to be default.


Posted from Mbworld.org App for Android

Originally Posted by benzslo

Quote:

Originally Posted by 99C43n843

im a dealer tech too. just read the whole ron to octance conversion thing online. good info. didnt know that. and I see what you are saying. but my only question is how did you find out what the default # was. bc when I go into my sds its just says 93, 91, 89, default. just curious to where you found 95 to be default.


Posted from Mbworld.org App for Android

I was just at training in December, advanced diag update class, looking through the manual for the 276 and I saw it specified 95 octane ron. I asked what that was about and they explained Ron is pretty much what the rest of the world uses etc and that that engine isn't special, most all our cars call for 95 Ron (our 91 premium)

It got me thinking, I was never happy with the c43 or the ml, just didn't seem quite as strong as other ones I would drive. I switched them both back and it was immediate and very noticeable difference, especially off the line! Lots more torque in the mid range, it really detunes it by doing that, at least on those particular models. The c43 could just barely power brake before, now it can light the tires from a stop.