[az968]

New 4 cylinder Cayman/Boxster coming. Seems they figured out 4 cylinders produces lighter engines and better fuel economy, and maybe make Porsches more affordable.



http://www.autonews.com/article/20140321...eport-says

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[Cloud9...68]

Makes sense - Volvo has also recently announced that most, if not all, of their new models will be available only with four cylinder engines, and BMW has a very peppy and economical turbo four in many of their latest models. With modern technology, lag in a turbo four can be virtually eliminated; as an example, our Subaru Forester's turbo four has virtually no perceptible lag. It's a smart way to improve gas mileage, reduce weight, improve packaging, and cut cost.

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[flash]

sure wish it was that way with the new X5 we just got. plenty of lag, unless you put it in full sport mode. ridiculous lag in ECO mode.

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[Cloud9...68]

That's how our 2007 328i drives, except it isn't a turbo! Eco mode really emasculates these cars.

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[flash]

it's almost dangerous. you step on the gas, and nothing happens, then it lurches. just crazy.



but the Z4 twin turbo was completely without lag. i'm at a loss.

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[MCL968]

Our Euro-Spec S60 Volvo has remarkable turbo lag, but when it does eventually kick in, it goes like a bat out of hell. The US version has less lag, and noticeably less power as well.

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[Bulti]

Turbo's can be very fuel efficient, and can provide a diesel-like torque in the lower rpm's. That way you avoid the higher rpm's and the thirst that copes with those.



But if you do not shift early, the turbo actually makes a car mor thirsty (compared to an atmospheric one).



At least, this is very much the case with my wife's 1.4 DFI turbo engine.

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[Cloud9...68]

The name of the game is to make your fuel economy numbers in the EPA's (in the case of the US) driving cycles look as good as possible. I'm sure the automakers are going out of their way to tune their engines and drivetrains to squeeze out the best possible showing in these tests. Unfortunately, this often makes for real world results, both in terms of gas mileage, and overall driveability, that fall short of expectations.

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[Bulti]

Nice example: EU testcycle norm fuel consumption for the latest Panamera S E-Hybrid: 3,1 l/100 km. Actual/real world cosumption: 9,2 l/100km. That's x 3!!



The best real-world number they got out of it was 7,2 l/100 km. But no living soul can drive that slow all the time.

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