Why is it that the 40kWh Model S is EPA rated 139 miles while the Rav4 EV is rated 103 miles yet their usable kwh capacity is about the same? For the RAV4 EV it is 41.8kwh and the Model S 40 it is believed to be software capped either at or close to 40kWh.
Model S 40 RWD
Weight: 4,647.3 lbs
196″ L x 77″ W x 57″ H
Drag Coefficient of 0.24
Rav4 EV FWD
Weight: 4,032 lbs lbs
180″ L x 72″ W x 66″ H
Drag Coefficient of 0.30
Here is the interesting thing. The Rav4 EV is:
16" Shorter
5" Narrower
9" Taller (It's an SUV so it can be lowered.)
615.3 Lbs Lighter
FWD instead of RWD
Aero Drag Difference is 0.06
Now for the tires!
225/65R17 Rav4 EV
245/45R19 Model S
245/35R21 Model S
This means
Width of tires is Smaller
Aspect Ration is higher which means less contact patch on the ground ... less rolling resistance?
Tire Diameter is smaller
As for which weigh more... that I am not sure, but I do have a quote:
Quote:
"19" cast aluminum wheels with all-season tires (Goodyear Eagle RS-A2 245/45R19). Note: optional 21" wheels come with Continental Extreme Contact DW 245/35R21 tires"
According to "http://www.Teslamotorsclub.com/showwiki.php?title=Model+S+-+FAQ":
Quote:
--
"Width:
19x8 for 19" wheels
21x8.5 for 21" wheels
Weights:
19" Wheels: 13.74kg ~30lbs each (according to a Tesla engineer)
19" All Season Tires: 27lbs each (according to Tire Rack for Eagle RS-A2 245/45 19")
21" Wheels: 35lbs
21" Continental ExtremeContact DW Tires: 26lbs"
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I'm not sure if the RAV4 EV Wheels are Aluminum or some other heavier alloy. Here is another quote:
Quote:
On an ICE forum they said the 17" limited wheels weighed 23 lbs 6 oz each. With stock tires someone said it was 51 lbs. I could be wrong but with a pair of lightweight wheels from TireRack you could save quite a bit of weight.....
Again, assuming its the same wheel as the ICE limited, its a 17x7" wheel. The same width as the Enkei Racing RPF1's which are the lightest wheels TireRack offers for the Rav4.
The Michelin Energy Saver A/S tires are 26 lbs each.
The Bridgstone Ecopia EP422 tires are 24 lbs each.
There are plenty more options but I know those are two popular tires.
So with Enkei Racing RPF1's and Bridgstone Ecopia EP422 your total would be 47lbs, 6 oz roughly.
If the stock set up is 51 lbs you'd be saving about 4 lbs 6 oz.
Quote:
I'm looking into this again. I just weighed my stock wheels and tires, they are 45.6lbs.
The 16" Enkei RPF1's 17x7" are 14.6lbs
Ecopia EP422 are 25lbs
Champion Fuel Fighter tires are 25lbs
That would be 39.6lbs total, per wheel. A savings of only 6lbs per wheel.
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225/65R17 Rav4 EV 45.6lbs lbs Total?
245/45R19 Model S 30+27 lbs
245/35R21 Model S 35+26 lbs
Model S Frontal Area is 25.2 square feet and fontal area drag is 6.2 Square feet.
https://www.tesla.com/sites/default/...n-the-road.pdf
Rav4 EV Frontal Area is a guess, but I did find something on the 2006 rav4 limited gasser but its only an estimate:
Drag area, Cd (0.33) x frontal area (30.4 sq ft, est ) . . . . 1 0.0 sq ft
http://media.caranddriver.com/files/...-v-6-specs.pdf
Now there are articles out there speaking a lot about how the engineers at Toyota redid the front facia of the RAV4 EV to be more aerodynamic and also picked the most aerodynamic head lights and smaller side mirrors. So I think the Frontal Area would be slightly smaller?
Interestingly the Toyota Dismantling Manual says: A fully charged RAV4 EV will travel
approximately 152 miles (245 km)
http://prius20.ru/instructions/disma...vdisman2nd.pdf
Looking at things this way it would seem the main thing is the higher drag, so if we were to lower the RAV4 EV's Drag by 0.06 to be the same as the Model S does this mean we would have closer range in terms of what the EPA states? I understand the Frontal Area would be harder to reduce, so we'd likely need more cd to hit similar numbers, but about how much?
I think the rav4 EV is smaller than the Model S. It is shorter and less wide and in terms of height ours is an SUV so it comes naturally high standing. If the RAV4 EV were to be lowered it might just stand closer to the Model S. Why then is there such a noticeable gap in range?
If a reduction in drag of 0.06 equals around +36 miles of range can we extrapolate this to see just how much range we can get from a RAV4 EV with a drag co of 0.10?
600×0.06=36
600×0.2=120 ?
I'd be quite happy with an extra 120 miles for a total range of 223 miles.
With these two pictures I can see the wider tires and wider body of the S, but also the shorter stance. Head lights seem to stick out more roughly on the RAV4 EV. Also, front bumper lines near headlights look rough compared to Model S. Hood Gap on Rav4 EV is also very noticeable. Wipers stick out a little.
Thoughts?