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Yea, it’s more to do with reliability. When your turbo engine blows you can just pull to the side of the road, airplanes just can’t do that. Safety is huge in aviation, there are always back up systems or mechanisms. Turbo engines in aviation are fantastic. You’re really not putting any extra stress on the engine as with a car because you’re only maintaining sea level pressure and not creating “boost” and yet you’re at say 14,000ft where you would have lost 14″ of manifold pressure, you’ve still got the same pressure at sea level.

If you’re looking for a power/weight advantage you’d have to step up to turboprop aircraft which are basically a jet core with a prop on it. They are very good for power/weight but they are heavy compared to a 4-6 cylinder piston engine and so they aren’t good in the small aircraft like a Cessna 172, therefore they are used in heavier and faster aircraft. The PT6 is the most popular turboprop and it produces up to 1500shp (2300shp for helicopters) and weighs 485lbs. The Piaggio P180 Avanti II is pretty much the King of turboprops and uses the PT6 engine. A little off topic though because it’s pretty much a jet engine :P

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Is it a question of reliability?

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I don’t have a lot of experience on the topic but my gut says I’d rather have N/A if im gonna have some fun and race it a bit and a small turbo engine if you want a commuter car with good gas mileage.

All the great performance cars I list don’t have turbos: 911 GT3, 911 GT2, CGT, Ferrari, Lambo, the M cars (at least for now ha), the R8 and R8 V10, Corvette, and even the regular Porsche 911, and these are all modern cars.

I’m a pilot and in aircraft, turbos are used on a piston engines to maintain sea-level pressure in the climb so you get the same performance, there is no performance “increase” so to speak. As you climb up you loose about 1 inch of manifold pressure/1000′ in altitude so it maintains SLP by slowly increasing the pressure up to a limit, not always the same as your cruising altitude. So I could be a little biased!

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