SparkevBlogspot wrote:Running some numbers, top speed will be about 95 MPH due to lack of power to overcome aerodynamics, regardless of the year. ...
We can't prove this because of the dang nanny SW, Thanks Obama... (I know EV motors have red lines too..)
And I seriously doubt this is true.
The car has 130 HP. It is still pulling really
strong when it suddenly hits 90 MPH then just stops the acceleration.
What's the top speed of the gasser Spark,, with it's much lower HP rating?
I think it might be fairly easy to see how much power it takes for the Spark EV to run at 90 mph; go to a straight stretch of road and run her up to 90, and watch the power meter and see what it's reading (on my cluster I keep the range meter on the left and the power meter configured to the right). 120kw is max power output; I'd be curious to see what the power output was at a steady state 90 mph. I'd bet that it will be less than 60kw. of course increasing the speed vs power output isn't linear, but it would give a baseline to see how efficient the aero and frontal area of this car are (again I'm betting they are quite good).
as an FYI -- I drive a EVSR pure electric sports racer road race car (one of three built by Entropy Racing) at various venues. it is direct drive RWD driving the rear wheels by means of a standard type LSD differential. the motor is 160 hp with about 250 lb-ft tq. we use a 25 kwhr pack. the car weighs 2100 without driver. aero on it is not particularly good; it's an old design body (same almost identically to a Spec Racer Ford, except we have removed all radiator openings and smoothed out the rear end some) and the cockpit is open with lots of buffeting and wind resistance. we have different gear ratios that we run on the car (wheels are 15" and we run 205-50-15 Toyo RA1 tires on it) -- the most commonly run gear ratio for most road race tracks we run is the 4.44 ratio. this gives a working top speed of about 120 mph which is good for most tracks. the 'redline' of our motor is 8k rpm. for shorter tracks we run a 4.75 rear gear, and for hill climbs we run a 5.50 or even a 6.50. acceleration is enhanced coming out of the corners but top speed drops (of course) also. the 'sweet spot' of our EVSR racecar seems to be around 4-6k rpm; they feel very strong pulling there. they happily spin to 8k rpm with no complaints but you can definitely feel them 'dropping off' above 7k rpm. the engineers told me that this is the 'field weakening' effect of the electric motors we use. one time just for fun we went to Pocono Raceway and ran the entire Tri-Oval; we put a very tall gear in the car (I think it was a 3.15) and we hit a radar indicated top speed of 141 mph (drag limited; we were no where near the 8k rpm redline).
anyway, my seat of the pants feel is that if the speed limiter was removed from a 2015 Spark EV, that it would do a little better than 90 mph but would then hit the redline rev limit of the motor. but a 2014 with the taller gear would almost certainly break 100 pretty easily.
attempt at posting a pic of me and EVSR: