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UK Top Gear tonight!

4K views 20 replies 15 participants last post by  Tim (Scotland) 
Leo, you are correct to say that an efi engine will run better than a non-adjusted carb engine at altitude.

However a naturally-aspirated engine will lose about 3% of its power for every 1000feet climbed.
That means that a cat-equipped 3.9 RR which has 172bhp and 225lb ft of torque at sea level will have 89bhp and 117lb ft of torque at 16000feet.

As a turbocharger is an exhaust-driven air compressor it will keep compressing air regardless of how thick or thin it is. Whilst the turbo was invented in 1905 it became very popular with early aircraft builders and pilots.
If the Tdi engine requires 50litres of air per second at sea level then it will get 50 litres of air, if it climbs so high that the air is half as dense then it will get 100litres of air per second.
Hence my Tdi-engined Rover will still have the 111bhp and 200lb ft* of torque it had at sea level even at 16000 feet.

Bye bye wheezing old v8.... :dance:


*Its not as much torque as a v8 but its lower down the rev range so its not as slow as it may sound.
 
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