Originally Posted by justy344
I have a 1980 mazda Rx7 that I would like to make in an electric sports car. Ideally I'd like to see a range of 50-100miles @ at least 55-70mph. It weighs 2385lb stock and only came with ~100hp 12A rotary to begin with. I'd also like to keep the stock 0-60 of 9 sec if not better. I've looked at the AC-50 motor kit (http://www.electricmotorsport.com/st...otors_ac50.php
) and at these: http://www.houseofbatteries.com/documents/VL34-P.pdf
for the batteries. Lets say at the moment that money isn't an issue (although it is but I'd like to know anyway) what am I looking at as far as amp hours for operation? and is the one motor enough? I'd be leaving in the stock 5speed. I honestly just wish I had enough money for a tesla roadster
You won't reach your 0-60 goals with the ac50, AC motors and controllers are much more expensive per horsepower than there DC equivalents.
I would look at a soliton1 (400hp controller) and a warp 11hv or kostov 11 alpha.
As for batteries. Saft are great but likely very expensive and it would be quite difficult to put a pack together to go 100 miles.
Have a look into Sinopoly and CALB prismatic cells.
You will use about 300-350WH per mile in your RX7, looking atwhat similar sized cars get.(the mathematics says my RX8 should get 310 WHAT per mile for reference)
As an example, for 50 miles range, 300WH per mile multiplied by 50 (miles) is 15,000WH. As you can't run the cells completely flat divide this by the %dod (70-80% is a normal figure) 15,000 / 0.8 = 18750WH
Then do the above again at 350wh per mile
So call it 20-22kwh pack for 50 miles
You really want to run the controller at as higher voltage as possible (350v) this is normally 95-100 LiFePO4 cells.
Dividing your total pack size by the number of cells you want and at what voltage you will charge them to gives the AH size of each cell.
So 20kwh / 95 cells / 3.6volts per cell gives 58.48AH
Then round this figure up to the next available size of cell.
95 60AH cells would do you nicely.
As a sanity check, multiply the number of cells by the charge voltage and then by the AH capacity. You should get you pack size from earlier.
If you let us all know you budget,skill level etc members can suggest parts.
Hope this helps.