Wait that isn't an F20c
08-27-2012, 04:54 PM
#3
pretty cool build! looks like the batteries are going in the rear. curious what the overall weigh distribution will be in the end? can you maintain the original 50/50 balance? and will you end up heavier or lighter than the original?
08-27-2012, 05:13 PM
#5
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The balance will (hopefully) be somewhat uniform. However, I have strategically placed a majority of the weight directly over the rear axle. I will work on the balance once I finish it.
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08-27-2012, 06:06 PM
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Man I just typed a huge response to this and then I pressed backspace, and Chrome seeked back in history and all my work was gone 
Anyway, round 2
Power is determined by voltage and amperage in the electric world.
The battery pack will consist of 416 cells with 4 cells in parallel and 104 in series. Each cell has a nominal potential difference of 3.3v.
Therefore, the voltage of the traction pack = 104 * 3.3
V Pack= 343.2v
Current is determined by both the batteries as well as the controllers. The batteries are 20ah A123 systems pouch cells that I bought from china
. 4 parallel = 80ah units.
Each cell has a discharge multiplier of 20-30c, therefore each battery module (8 modules) should put out 1600-2400A.
However, my controller has a limit of 2000A, so this is the system bottleneck. It can put out 2000A as long as you can keep it cool (liquid cooling).
P = I * V
P = 2000 * 343.2
P= 686400 w ----> 686.4 Kw
1 Kw = 1.341 hp
686.4 * 1.341 = 920 hp
Assume an 85% drive train efficiency
920 * .85 = 782 hp
On top of that, the motors can put out 1500 ft-lbs of torque at 0 rpm
So overall, the car has a potential of 700ish hp. I am assuming I will end up getting anywhere from 550-650 at the wheels.
It should be fun
Once its done Ive got something to race it against / compare to.
Ironically, the car that it shall race was also the vehicle that transported the S2000's motors
Can you guess what it is ? :--)
Anyway, round 2
Power is determined by voltage and amperage in the electric world.
The battery pack will consist of 416 cells with 4 cells in parallel and 104 in series. Each cell has a nominal potential difference of 3.3v.
Therefore, the voltage of the traction pack = 104 * 3.3
V Pack= 343.2v
Current is determined by both the batteries as well as the controllers. The batteries are 20ah A123 systems pouch cells that I bought from china
. 4 parallel = 80ah units.Each cell has a discharge multiplier of 20-30c, therefore each battery module (8 modules) should put out 1600-2400A.
However, my controller has a limit of 2000A, so this is the system bottleneck. It can put out 2000A as long as you can keep it cool (liquid cooling).
P = I * V
P = 2000 * 343.2
P= 686400 w ----> 686.4 Kw
1 Kw = 1.341 hp
686.4 * 1.341 = 920 hp
Assume an 85% drive train efficiency
920 * .85 = 782 hp
On top of that, the motors can put out 1500 ft-lbs of torque at 0 rpm
So overall, the car has a potential of 700ish hp. I am assuming I will end up getting anywhere from 550-650 at the wheels.
It should be fun
Once its done Ive got something to race it against / compare to.
Ironically, the car that it shall race was also the vehicle that transported the S2000's motors
Can you guess what it is ? :--)
