Racing fuel
MBWorld Fanatic!
Joined: Apr 2014
Posts: 1,001
Likes: 53
From: Cincinnati Area
C63 507 with BS Body; 2008 SLK 55
Going high in Octane (unleaded) is no issue, too low octane rating would be a problem as the engine would pull timing. You will not get much out of very high octane, unless it is very hot/engine gets very hot - or, if you have a supercharger.
I personally am doubtful it is worth paying what - 8.50$/gal? for race fuel. I used it myself though, just to save time when my tank was getting low.
I personally am doubtful it is worth paying what - 8.50$/gal? for race fuel. I used it myself though, just to save time when my tank was getting low.
MBWorld Fanatic!
Joined: Jun 2008
Posts: 8,074
Likes: 2,867
From: Los Angeles
2012 P31 C63 Coupe Trackrat, 2019 GLE63S Coupe Beast
What he said ^
On stock tune, same day same conditions (runs a few minutes apart), no changes other than going from Sunoco 93 octane to MS109 I picked up 0.2 and 3mph in the quarter. It works, I don't care what anyones opinion is. Numbers don't lie.
On stock tune, same day same conditions (runs a few minutes apart), no changes other than going from Sunoco 93 octane to MS109 I picked up 0.2 and 3mph in the quarter. It works, I don't care what anyones opinion is. Numbers don't lie.
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Super Member
Joined: Apr 2009
Posts: 752
Likes: 10
From: Orange County CA
CLS63S
I had success using a mixture of 91/MS109 and it worked well. I could tell the response in the pedal and the car just "felt" like it pulled a bit harder on the butt dyno.
It made a hell of a difference using a race tune for MS109 and running pure MS109. Car is an animal. Easily 10-15 extra horse.
If youre going to track it and you have the time to get them to send you a file, do the MS109 tune.
It made a hell of a difference using a race tune for MS109 and running pure MS109. Car is an animal. Easily 10-15 extra horse.
If youre going to track it and you have the time to get them to send you a file, do the MS109 tune.
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