Finally. EB's E85 Dyno Results

[Shabodah]

Originally Posted by GMredline

E85 Seasonal Blend Changes:

Wisconsin's lattitude;

Sept 1st to Oct 31st - 78%
Nov 1st to March 31st - 70%
April 1st to May 15th - 78%
May 16th to Aug 31st - 83%

Doesn't sound unlikely that further north would have higher gasoline content, then, does it? Regardless, seems like we should call it E77 instead of E85, lol.

[GMredline]

Originally Posted by Shabodah

Doesn't sound unlikely that further north would have higher gasoline content, then, does it? .

Yeah. At least for most of the year. I buy all my E85 from Renew Fuel Stations - Renew Fuel Stations - Home

Originally Posted by Shabodah

Regardless, seems like we should call it E77 instead of E85, lol

Yup. E70 in the winter, E78 in the spring and E83 in the summer. All my local Renew stations just got their first fill of Summer E85 so most are in the 81-82% range. Except of course for the station I buy at which some how got a delivery of E70 so its is around 72%.

Those changes have a big effect on fueling in Open Loop. My actual AFR dropped almost .3 tenths going from the E78 to E70. I would image that going from the winter blend to the summer blend could change actual AFRs in PE by .6 - .8 tenths.

To run one tune all year the car should be tuned as lean as you want to run using the Summer blend. Then as the fall/Winter blends come out the car with richen up and still be safe.