PeachParts Mercedes-Benz Forum - View Single Post

Greg in Oz · #2 02-14-2005, 03:54 AM

Duke,

I realise you replied to one of the threads I posted regarding this subject some time ago. I posted the same thread in different forums so you may be interested to read the various other replies. They can be found at:
http://www.peachparts.com/shopforum/showthread.php?t=67772
http://www.peachparts.com/shopforum/showthread.php?t=67773
http://www.benzworld.org/forums/forums/thread-view.asp?tid=242608
http://www.benzworld.org/forums/forums/thread-view.asp?tid=555023
http://forums.mbworld.org/forums/showthread.php?t=42712
http://forums.mbworld.org/forums/showthread.php?t=42715

I have since been running both my M102 and M103 with the different value R16 as described in those threads. Note that in my case the greatest ignition advance was not obtained with R16 removed but with a higher value (and a different value for each engine) to that fitted originally. The original values for my Aussie delivered cars were lower than those fitted to the equivalent European or US models due to the low octane (91RON) unleaded fuel available here at the time they were sold new. We now have higher octane fuel available (95 and 98RON). I have found that my M103 does require the higher octane fuel to avoid pinging with the more advanced timing, however since my original threads were posted I have found that the M102 is quite happy running regular fuel even with the more advanced timing. As for noticing any difference in the seat of the pants, I recently had cause to set the M103 back to the original setting due to the unavailability of the higher octane fuel. In doing this I did perceive a loss of mid range torque at wider throttle openings compared to when running the more advanced timing. Back when I changed from the original setting to the more advanced setting the difference was not so obvious.

Greg