Quote:
Originally Posted by oldtamiyaphile
It can be done though, for example with an electric super charger you'd have a very economical 1L engine on no boost, but still have power for when you really need/ want it. Exhaust gas might be 'free' energy, but the realities of fuel enrichment still make it fairly uneconomical.
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Quote:
Originally Posted by Ecky
I've been seeing some articles come up lately about how downsized turbo engines are more often than not delivering worse fuel economy, or at least no better, than the larger displacement engines they're replacing, at least with your typical driver. I'm not sure if it's just a matter of engineering, but it usually seems to be the case that with the higher compression, timing needs to be pulled and/or AFR goes rich, causing them to be less efficient when producing power under boost than a NA engine. Small turbo motors are great for people who stay out of boost, but most people have lead feet.
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On this one - 1.0 liter ecoboost - the need for fuel enrichment is avoided; it runs stoichiometric throughout the load range. At least in part this is due to the exhaust cooling in the exhaust manifold integrated with the cylinder head.