eBike Drag Racing Timing?

rg12 · Feb 23, 2018

Hey Guys,

Me and the guys have some crazy builds and want to time our pulls like a real drag race.
I need something portable that I can just locate on the floor of a parking lot, a device for the starting line and another one for the finish line and have it send timing data to my phone or laptop.

Is there such a thing?

Drunkskunk · Feb 23, 2018

Real portable timing lights are about $5000.
But they make them for RC cars, that can go wireless for about a football field in length, and run in the $200 range.

Here's one: https://traxxas.com/products/parts/accessories/6570dragtimingsystem

rg12 · Feb 23, 2018

That thing looks too much like a toy...
If I pull this out at a riders meeting I would not get street cred for that

I remember ten years ago a few amateurs driving their nitro rc cars on a dirt track and one guy was sitting with a laptop checking times on a chart...
I checked for systems with a transponder but they are super expensive and I don't know if they can measure drag times since they are designed for laps.

rg12 · Feb 27, 2018

Bump...

gogo · Feb 27, 2018

Aren't there smartphone apps that do this?

rg12 · Feb 27, 2018

It needs to measure the start and also finish just like a drag race, no reaction time.

gogo · Feb 27, 2018

They use accelerometers, so should be able to record from the moment of first movement.

You could also use cards-in-the-spokes method and use the sound recording to derive speed and distance.

rg12 · Feb 28, 2018

So how will it measure the finish line cross?

lowrider13 · Feb 28, 2018

Dynolicious I-phone App $13
Haven't tried it perosnally but reviews read positive

gogo · Feb 28, 2018

rg12 said:
So how will it measure the finish line cross?

1 click = one wheel revolution. 1/4 mile = X clicks. Count them using a sound editing program that displays a timeline.

Apply some calculus to get the rate of acceleration if that interests you.

Or, as lowrider13 suggests, use a smartphone app.

eBike Drag Racing Timing?

rg12

100 kW

Drunkskunk

100 GW

rg12

100 kW

rg12

100 kW

gogo

1 MW

rg12

100 kW

gogo

1 MW

rg12

100 kW

lowrider13

1 mW

gogo

1 MW

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