Thanks for the input guys and good discussion on E85. I will probably try both the M1 0w40 and Motul x-cess 8100 5w40 and get reports on each. Sounds like the M1 will be the most economical.
Any input about Blackstones method of testing fuel dilution or should I look to other labs?
Originally Posted By: A_Harman
What is "roll racing"?
But anyway, it sounds like you are being careful about tuning your engine. Is the .87 lambda number targeted everywhere on the fuel map, or only above a certain MAP? You can run 1.0 at light loads, and it would decrease the possibility of fuel dilution.
As for oil, I would recommend some kind of SN-spec 40 weight. M1 0w40 or PUE 5w40 have the same HTHS. Your oil temps are in a good range, so I don't think you need anything over 40.
As mentioned, roll racing is starting from a roll, like 40mph-60mp up to 150 or so. Easier on the drivetrain than launching from a dig (dead stop) and is actually a better test of which car is more powerful as dig racing is all about tires and launch.
The Lambda is scaled based on load and RPM. I actually run leaner than 1.0 in a good portion of the low RPM range. Essentially a lean cruise. Helps with mileage a little bit. Our fuel system is closed loop and has factory wideband 02s. My fuel map looks like this: