Hi from Australia,
I am towards the end of a project to build a special EV for motorkhana / khanacross. Most of you would know these events as similar to Autocross.
While there are other electric race cars around this will be the first specifically for motorkhana and khanacross.
There are a lot of rules governing these specially built cars. I won't get into too much detail on the rules other than to say they have forced me to do some things I wouldn't have otherwise done. Such as the height of the sides.
It is running 12 x 12v high cranking AGM batteries (I don't need much range). The motor is an Advanced DC 9 inch and controller is a Curtis.
I anticipate the vehicle will weigh around 600kg or 1300 pounds (including batteries but excluding the driver). I have gone with front wheel drive because in motorkhana there is a lot of handbrake turns which chew up rear tyres(tires) and a front wheel drive allows me to put track tyres on the front and old rubbish tyres on the back to save expense. Most of the special vehicles I compete against a quite a bit smaller than the one I have made. This does give them an advantage as they can slalom their way through the flags without dropping as much speed. I have stuck with a two seat arrangement becuse it allows me to retain all the running gear (driveshafts etc) from the donor car. Plus it allows me to take passengers and scare the pants off them.
I am after some advice regarding safety. I am really after some way to detect ANY voltage on the chassis and trigger a shut down of the contactors to remove the source of the voltage. But I want to do this without introducing any connection from the Battery (Traction) -ve to the chassis. Any ideas?
I started the project back in March and I am on track to finish before Christmas and that gives me a few weeks for refinement before the first event on Feb 7th.
I currently use a Nissan Pulsar N13 for these events
Here is an example of a motorkhana:
Here is an example of a khanacross:
I look forward to any thoughts you might have