Questions tagged [mathematics]

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5
votes
2answers
243 views

Can the amount of ampere hours in a car battery be determined by it's output in volts?

Let say an average car battery has a 48 amp-hour capacity. Is it possible to determine how many ampere hours are left in a battery if the volts are known? What about if they are lower (e.g., 8 V) than ...
2
votes
1answer
324 views

ELM 327 How i can know a calculated CO CO2 HC & NOx with ELM OBDII? Is it possible?

I have a question, if i have many codes from my ELM 327 OBDII, Mass sensor, Km traveled, Lambda, Temp, fuel pressure, gallons x time, engine load.... hao i can calculated these emissions?
7
votes
2answers
16k views

Calculating actual speed of vehicle based on wheel size?

I started wondering today, how does one calculate the moving velocity of a vehicle if they change their tires? I know there are a lot of companies that make the gauges for tuners that change wheels, ...