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Old 08-26-2012, 03:54 PM   #89
roger 04 rt OP
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Joined: Nov 2011
Location: Massachusetts
Oddometer: 2,145
In the prior post I showed that the Motronic had Adapted Open Loop fueling, without a BoosterPlug or any other modifications, to the 13.5:1 AFR that the LC-1 Wideband O2 replacement is set to.

Because the move from 14.7 plus the leanness of E10 requires the Motronic to add 14% to the stock fuel tables to reach 13.5, and because adaptation is deliberately a slow process, it took several rides over several hours for the Motronic to dial itself in.

Next I wanted to see how quickly it would Adapt if I shifted the IAT sensor by 30C, an 11% increase in fueling, such that the Motronic only had to move the last 3% (14% - 11%).

I wired the BoosterPlug (an iice air in the -30C position would have worked nicely but the bp was already on) and the stock IAT in series. I then checked with the GS-911, the series pair did shift them temperature -30C. Next the Motronic was reset and I went out for a test ride. (LC-1 still set to 13.5.)

The result was that the bike needed little adaptation to get Open and Closed Loop fueling in sync. This produced the smoothest engine performance in all the testing I've done, and kept the point at which I've got strong roll-on throttle at about 2600 rpm.

My next test will be to remove the BoosterPlug, run with only the stock IAT and boost the fuel pressure to 50-55 psi using an external fuel pressure regulator from Aeromotive, installed in the return line to the tank. I will select and measure a pressure that boosts the fuelIng by about 12% and test ride to confirm similar results to the 30C temperature shift.
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