C219 CLS55 and CLS63, 2004-2010

100 octane make a difference?

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Old Mar 30, 2006 | 09:36 PM
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100 octane make a difference?

just a quick question, and i did search it briefly. . .but would 100octane in the cls55 make any difference, or is it pretty much tuned from the factory for 91-93?

thanks in advance!
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Old Mar 30, 2006 | 09:59 PM
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Talking It Could Help

frankieb96 - Pretty much as you mentioned, however if the gas you have been using is of poor quality then yes you will feel a slight difference. Also, if the weather is cold, higher octane will help a little to take advantage of the denser air, given the ECU has any timing left in it's operating parameters to throw at the situation.

Now, if you have a pulley and some ECU tuning, then yes for sure, if the ECU tuning was set up to take advantage of the higher octane! It's all about moving Peek Cylinder Pressure closer to Top Dead Center to take mechanical advantage, as much as possible, of this Peak Cylinder Pressure event. - - Bob
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Old Mar 30, 2006 | 10:15 PM
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Originally Posted by Evolution Marine
frankieb96 - Pretty much as you mentioned, however if the gas you have been using is of poor quality then yes you will feel a slight difference. Also, if the weather is cold, higher octane will help a little to take advantage of the denser air, given the ECU has any timing left in it's operating parameters to throw at the situation.

Now, if you have a pulley and some ECU tuning, then yes for sure, if the ECU tuning was set up to take advantage of the higher octane! It's all about moving Peek Cylinder Pressure closer to Top Dead Center to take mechanical advantage, as much as possible, of this Peak Cylinder Pressure event. - - Bob
thanks bob. . .kinda what i figured, but i needed to hear it from someone, haha

im fortunate to have pretty good quality stuff here in orlando, and i can drive 5 min from my house and get 100oct right off the pump at Sunoco, i was just pondering it. . .

EDIT: forgot i had a camera phone pic. . .was just messing around cuz my friend put a half tank in his car(E39 M5)
Attached Thumbnails 100 octane make a difference?-img027-small-.jpg  

Last edited by frankieb96; Mar 30, 2006 at 10:18 PM.
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Old Mar 30, 2006 | 10:47 PM
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Nice M3, don't care for the new body style.
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Old Mar 30, 2006 | 10:53 PM
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Originally Posted by adx
Nice M3, don't care for the new body style.
thank you. . .as for the new M3 - i havent seen a "finished product" yet, so im keeping my fingers crossed that it will be decent *stylistically*, but i'll put my money on the fact that the engine and gearbox will be phenomenal
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Old Mar 30, 2006 | 11:22 PM
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Correct me if wrong, but higher octane fuel helps FI cars, especially the turbo cars.
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Old Mar 31, 2006 | 02:09 AM
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Originally Posted by frankieb96
just a quick question, and i did search it briefly. . .but would 100octane in the cls55 make any difference, or is it pretty much tuned from the factory for 91-93?

thanks in advance!
Hell yeah! With a 100 octane you should feel a difference as soon as the fuel circulates! That should be quite fun, but be careful with that. I've seen people blow engines (admittedly not in a Mercedes) fooling around with hi-po "petrol".

M
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Old Mar 31, 2006 | 03:55 AM
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Originally Posted by newton22
Correct me if wrong, but higher octane fuel helps FI cars, especially the turbo cars.
Only if the car is tuned for it, otherwise it's a waste of money.
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