What engine would use more petrol

[beeza]

Under the same driving conditions and in a sedan say.A b16 or a turboe'd d16.and both engines put out the same power :D

[v__]

depends on how heavy footed you are =]

[beeza]

That's why I said under the same driving conditions.

[Paul1985]

pretty sure a turbo'd d16 would be putting out more power than a b16a, unless it was also built..

stock b16 vs turbo d16, they are both 1.6lt engines.. so the one which is turbo'd would be forcing more air into the chamber so therefor forcing more fuel. Thus, the turbo would be using more. The way they are driven would be a factor. If you are wanting to turbo a car and are worried about fuel costs.. dont bother. With performace comes $$$

[1996ek1]

I actually read that turbo doesnt always mean you get worse fuel economy.
Deano thinks his is actually better then before...

[JohnL]

I actually read that turbo doesnt always mean you get worse fuel economy.
Deano thinks his is actually better then before...

A lot depends on the relative compression ratios, and of course on how the cars are driven. The more power you use then of course the more fuel you'll use all else being equal (so a turbo will use more fuel driven harder, no surprise), but, if you drove both quite sedately then you might also expect the turbo motor to be less efficient and to use more fuel in this case too.

If you have two identical cars with similar engines but one turbo and the other not, then it's likely that the turbo motor will be running a lower compression ratio. The fact that the turbo motor may have a lower compression ratio will mean a less complete and efficient burn when boost isn't present (same as the theoretical difference between two otherwise similar atmospheric motors with differeng compression ratos). Of course if the turbo and non turbo engines both have a similar compression ratio then the above may not apply.

This might not be so much the case for some carb engines though, as the turbo can provide superior atomisation which may improve combustion efficiency and lessen the difference, but only on a 'suck through' set up, not a 'blow through'. The turbo itself creates an exhaust restriction, which might contribute to poorer economy.

[beeza]

Great Info John L :)