Neat video...I skipped past some of the explanation portion as it drug on some.His 8.1L starts out at 347hp and then drops to 285hp at 5600'.Video

Haven't watched the video, but that is about right doing the math. An N/A engine drops about 3% power every 1,000 ft above sea level.3 x 5.6 = 16.8347 hp - 16.8% = 289 hpNot too far off.

I enjoy watching his videos including the rear differential cover design

FishOnOne wrote:I enjoy watching his videos including the rear differential cover designOddly enough, he started that series of videos promising data on how effective (or ineffective), the aftermarket covers were. I'm still waiting.Since they never presented the data, I can only assume, they work just as well as the stock cover, that his tries to duplicate. All said, the cost of an aftermarket cover, is the cost it takes to get A DRAIN PLUG.

ShinerBock wrote:Haven't watched the video, but that is about right doing the math. An N/A engine drops about 3% power every 1,000 ft above sea level.3 x 5.6 = 16.8347 hp - 16.8% = 289 hpNot too far off.It would be fun to see a series of similar tests with diesel and turbo vs non-turbo.As you say it matches the math but it's always nice to see confirmation.

valhalla360 wrote:It would be fun to see a series of similar tests with diesel and turbo vs non-turbo.As you say it matches the math but it's always nice to see confirmation.A naturally aspirated diesel would have the same ratio of loss as an NA gasoline. A supercharged engine, despite popular belief, also loses just as much power with elevation gain as NA, as the supercharger is spinning at a fixed rpm. Unless the supercharger is purposely bleeding off boost at sea level, and then doing full boost at elevation.With turbos, it depends on the size of the compressor. If they're undersized, like say an Ecoboost (for throttle response), then at high elevations you'll run into the limit of the compressor, and lose some power. Usually significantly less than NA though.With a "performance" turbo, where the compressor has plenty of room left on the compressor map, then at elevation it may retain near 100% of power. Trade-off is a relatively laggy throttle response.

Banks experiment - altitude and hp | Good Sam Community

valhalla360
Navigator
Jan 22, 2019
ShinerBock wrote:
Haven't watched the video, but that is about right doing the math. An N/A engine drops about 3% power every 1,000 ft above sea level.

3 x 5.6 = 16.8

347 hp - 16.8% = 289 hp

Not too far off.

It would be fun to see a series of similar tests with diesel and turbo vs non-turbo.

As you say it matches the math but it's always nice to see confirmation.
harmanrk
Explorer
Jan 21, 2019
FishOnOne wrote:
I enjoy watching his videos including the rear differential cover design

Oddly enough, he started that series of videos promising data on how effective (or ineffective), the aftermarket covers were. I'm still waiting.

Since they never presented the data, I can only assume, they work just as well as the stock cover, that his tries to duplicate. All said, the cost of an aftermarket cover, is the cost it takes to get A DRAIN PLUG.
FishOnOne
Nomad
Jan 21, 2019
I enjoy watching his videos including the rear differential cover design
ShinerBock
Explorer
Jan 21, 2019
Haven't watched the video, but that is about right doing the math. An N/A engine drops about 3% power every 1,000 ft above sea level.

3 x 5.6 = 16.8

347 hp - 16.8% = 289 hp

Not too far off.

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Banks experiment - altitude and hp

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