E85 study, baseline

I have a kit to convert my 2003 Prius to run on E85. But first I need to establish a baseline using E10 from the same company that sells E85. I also have to confirm use of MAF as a reproducible metric for fuel consumed per HP:

One aspect not shown in the chart is drawing over 80A from my Re-Involt traction battery. In the past, 70A had been the limit and I had thought it was part of the HV ECU programming. But it looks like the lower internal resistance modules in the Re-Involt provide an extra 10A of capacity . . . awesome!

Some other notes:

Temp: 77F​

Engine rpm​

MG1 torque​

air flow​

speed (mph) 45.6/46.3 -> 47 indicated -> 50 mph GPS​

batt V​

Batt A​

6:08 AM​

Bob Wilson

 

I reformatted the data to show the climb:

Some observations:

• 40 seconds - the engine goes into an enriched mixture to deal with the excessive heat. Enriching the mixture reduces power yet we see the traction battery provide more power.
• 70 seconds - the traction battery draw-down has reached a point where it has to reduce power. However, the speed effect is minimal.

I have to do two more, max hill climbs and then add the kit and three more max climbs. Then I can run the tank dry and switch to E85. Here are the two additional runs:



Bob Wilson