Further testing we on purpose set the fuel trims via tuning so that they were 8 percent lean on average.

As seen even being this lean there was no knock at all, the WOT timing at 27 degrees with engine compression at 11.3:1 with 91 octane smog gas.

This also points to the fact of the cyberspace myth that the fuel trims must be rich on average when all that really does is reduces gas mileage and less torque as the leaner AFR is the more torque is seen as we shown in these results.

Weather for this test was about 45 degrees.