C36 AMG High Octane
Newbie
Joined: Sep 2015
Posts: 10
Likes: 0
2008 c63 amg
I bought some 100 octane and mixed it with 91 from the pump. Did a 50/50 mixture which came to about 96 octane and drove it for about 3 hours on the highway. Only difference I noticed is that it took a lower RPM to keep up 80-90mph than it usually would, which is expected. However, I didn't notice much performance increase other than that.
Junior Member
Joined: Jun 2015
Posts: 22
Likes: 0
98 silver C43 210K
I always wondered how much the ECU actually adjusts the timing to eliminate knock on high compression engines. " I want to believe " that running 93 octane actually gives me more power, and thus, better gas mileage.
I would love to see a OBD2 based smart phone app that logs how far the timing is adjusted when knock is NOT sensed.
With respect to dern36's post...I doubt the ECU would adjust past 93 octane...and thus there would be zero increase in performance or gas mileage. You would have to get a tune for 106, but then even so I'm not sure we've the compression to see any benefit....
I would love to see a OBD2 based smart phone app that logs how far the timing is adjusted when knock is NOT sensed.
With respect to dern36's post...I doubt the ECU would adjust past 93 octane...and thus there would be zero increase in performance or gas mileage. You would have to get a tune for 106, but then even so I'm not sure we've the compression to see any benefit....
MBWorld Fanatic!
Joined: Jun 2010
Posts: 1,246
Likes: 52
From: tennessee
s320
If running high octane you need to advance timing for more power.One way is to fool the computer by installing a 1.5 k resistor to wire going to coolant sensor near thermostat.Some have 4 wires or two hots,you will need two resistors.Only problem is your temp guage won't work,but if your cooling system is fine,it would be ok for the track.
