DW2 Posted June 1, 2020 Share Posted June 1, 2020 I’m planning a day long drive with bikes on a roof rack and wondering what adjustments to the planned assumptions would be good. In the past, I’ve seen the energy drop a fair bit faster than driving without the roof rack but I didn’t drive far enough to figure out how to adjust the assumptions. Tesla model S75 Link to comment Share on other sites More sharing options...
ANBO Posted June 1, 2020 Share Posted June 1, 2020 Some Google results: https://phys.org/news/2016-04-roof-racks-fuel-economy.html https://forums.tesla.com/forum/forums/data-point-energy-usage-roof-bikes-and-pod Link to comment Share on other sites More sharing options...
DW2 Posted June 2, 2020 Author Share Posted June 2, 2020 I am not surprised to see that level of reduction, just curious if there was someway I could get A Better Route Planner or the in-car system to predict my range better when using a roof rack. Would just adjusting Reference Consumption do that? So for example if I assume 324 wh/mi, do I multiply that by 1.33 and instead use 430 wh/mi when I've got the roof rack on? Link to comment Share on other sites More sharing options...
Jason-ABRP Posted June 3, 2020 Share Posted June 3, 2020 The absolute best way is to set up live data, put the rack and bikes on, and go for a test drive. We'll dial in the consumption very quickly (and not just the one number, but the whole consumption curve across all speeds). Within 5-15 minutes of driving we should have a very reasonable model which is quite accurate for planning (assuming you spend a little time at each speed). The "Reference Consumption" is just one data point on the consumption curve - specifically at 65mph, adjusting that directly just moves the curve up and down to match the number you set. Link to comment Share on other sites More sharing options...
