is it true...

paradigm said:
Oh the ironing.
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O rly? Do you think I made a mistake with my English?
confusedeb6.gif


Or do you just think I'm a **** :D
 
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Maximum power output whilst maintaining closed loop control (on a petrol) will mean maximum efficiency.

Dynamic compression ratio and therfore engine efficiency is better. Plus larger throttle opening = less pumping loses.
 
Simon said:
Maximum power output whilst maintaining closed loop control (on a petrol) will mean maximum efficiency.

Dynamic compression ratio and therfore engine efficiency is better. Plus larger throttle opening = less pumping loses.
Click to expand...
Again, in English this time? :p
 
Simon said:
Maximum power output whilst maintaining closed loop control (on a petrol) will mean maximum efficiency.

Dynamic compression ratio and therfore engine efficiency is better. Plus larger throttle opening = less pumping loses.
Click to expand...
Was just about to post exactly that ;)
 
dirtydog said:
Does anyone here get better fuel economy when they thrash around, compared to when they drive gently? Erm... :rolleyes:
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Well, yes :)

But you won't ever get this scenario in a modern car. Go back some time and cars were given enough power to get to their top speed and no more. We will use my Pop as an example. It has 30hp and that is what it needs to accelerate at x rate through its 3 gears up to 60mph as efficiently as it can and no more. Hence it gets about 39mpg around town and much more on the motorway. If I drive that on part throttle you are effectively strangling it by making it suck its air through a tiny hole so it runs more inefficiently and uses more fuel.

You will not ever get this with a modern car because it has a lot more power than it needs. You'll just be accelerating it a lot harder than you need to. Modern cars are in effect overpowered and too heavy to ever be properly efficient, but that's what the market demands so that's what they are like. We could have very efficient cars running on petrol but they would be a lot slower than you'd want :)

Edit, and here's the reason:

Simon said:
Maximum power output whilst maintaining closed loop control (on a petrol) will mean maximum efficiency.

Dynamic compression ratio and therfore engine efficiency is better. Plus larger throttle opening = less pumping loses.
Click to expand...
 
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