How Much Horsepower Do You Lose Per Thousand Feet?

As a general rule, a naturally aspirated combustion engine will lose 3% of its power for every 1,000 ft of elevation gain. If you have 100 horsepower at sea level by the time you get to 5,000 feet of elevation your engine is making 85 horsepower. At 10,000 feet of elevation your engine will make 70 horsepower.

How much horsepower do you lose for every thousand feet of altitude?

three percent
Generally speaking, an engine loses three percent of its rated power for every 1,000 feet of altitude gained. This means you could lose as much as 20% of your vehicle’s horsepower if you drive it from sea level to Big Bear Lake (with its 6,750 elevation).

How do you calculate horsepower loss?

To calculate a drivetrain loss percentage, subtract the wheel horsepower from the engine horsepower, divide by the engine horsepower, then multiply by 100.

How do you calculate horsepower from altitude?

How to Calculate HP Loss at Altitude?

1. First, determine the original engine power (HP).
2. Next, determine the total altitude (ft).
3. Next, gather the formula from above = HPL = EP * A/1000 *.
4. Finally, calculate the HP Loss at Altitude.

How much HP do engines lose?

In using a chassis dyno, there’s already some engine power loss going on. The transmission, driveshaft, differential, and wheel hubs all absorb a portion of the engine’s output. The ‘traditional’ rule-of-thumb states the drivetrain causes a 15% power loss.

Does 1000 ft elevation make a difference running?

For every thousand feet of elevation increase above 1,000 feet above sea level, VO2 max max dropped by 1.9%. Additionally, time to exhaustion on a constant-speed treadmill run decreased by 4.4% per 1,000 feet of altitude.

How much faster can you run at lower elevation?

Every 100 feet of elevation descent speeds you 3.6% of your average one mile pace (2% grade/mile). Example: A race at 3,000 feet would slow an 8-minute miler (3 x . 01x 8 x 60) = 14.4 seconds per mile, or 6:20 total in the marathon.

How much HP do you lose through drivetrain?

In the case of hypoid-type gearsets (where the gear tooth profile is both curved and oblique) that are commonly used in RWD differentials, losses in the 6 to 10 percent range are the norm, while loss from the driveshaft(s) and prop shaft(s) tend to account for about 0.5 to 1 percent of total loss, depending on how well

How much HP do you lose per pound?

Note: Curb weight is the total weight of the vehicle without a driver. Gross weight is the total of the car with the driver included. With calculations complete, final numbers show a horsepower to weight ratio of 18.18. For every 18.18 lb removed, the car will gain approximately one horsepower.

How much power is lost through the drivetrain?

Experts say that overall drivetrain power loss is approximately 2-3%. Therefore, keeping the math simple, if you applied 200 watts to your pedals, the pedals would see all 200 watts. The hub however would see roughly 194-196 watts.

Is 1 HP equal to a horse?

Power of a horse
Although it may seem safe to assume that one horsepower is the output a horse is capable of creating at any one time, that is incorrect. In fact, the maximum output of a horse can be up to 15 horsepower, and the maximum output of a human is a bit more than a single horsepower.

Do Turbos lose power at altitude?

Assuming the pressure integrity of the intake system is correct, the turbocharged engine will generally not lose power at altitude. Of course, the turbo might not be able to produce full sea level pressure, and therefore the rated power at altitude will be lower than at sea level.

How much is 1 HP equivalent to?

746 watts
A power level of 1 hp is approximately equivalent to 746 watts (W) or 0.746 kilowatts (kW). To convert from horsepower to watts, multiply by 746. To convert from watts to horsepower, multiply by 0.00134. To convert from horsepower to kilowatts, multiply by 0.746.

How much HP is considered high?

Generally, you’ll be able to feel the speed of the car with anything more than above 200 horsepower. Volkswagen’s Golf GTI, for example, has upwards of 245 horsepower. Cars with power ratings above 300 horsepower will usually be serious performance vehicles, and modern supercars will have more than 500 horsepower.

Is 500 HP a lot?

Depends on the car. A ‘normal’ supercar might have 500hp, a normal city car might have 90hp or so, while a normal family hatchback could have 140hp. A car with less than 100hp can be hard work outside of town, though.

Is 1 horsepower fast?

A 1-horsepower engine couldn’t maintain more than 20 or 30 mph in a normal car, and you could never turn on the headlights or the air conditioning. The other problem is acceleration. The bigger the engine, the faster you can accelerate from zero to 60mph.

Is 2000 feet of elevation gain a lot?

Elevation gain is up to 2000′. This level is used for challenging hikes. Perhaps the average elevation gain falls within the criteria for “moderate” but there are enough steeper sections or rough segments to warrant a higher rating.

At what altitude do you notice less oxygen?

After the human body reaches around 2,100 metres (6,900 ft) above sea level, the saturation of oxyhemoglobin begins to decrease rapidly.

What is the best altitude to live at?

Results of a four-year study by researchers at the University of Colorado suggest that living at altitudes around 5,000 feet (Denver is 5,280 feet above see level) or higher might increase lifespan.

What elevation gain is considered a hilly run?

elevation gain (or loss) of 1000 ft or more. Rule #3, aka “the rule of 120”: a course can be considered hilly if it has three (or more) rises (or descents) of 150 feet (or more).

How much does a hilly run slow you down?

3 His rule states that every percent gradient of incline (going uphill) will slow you by 12-15 seconds per mile, and every percent gradient of decline (going downhill) will aid you by 8 seconds per mile.