Quote:
Originally Posted by oldtamiyaphile
Baby turbo engines have been built from the ground up to beat the NEDC test. Now that NEDC is being replaced with RDE there's a big scramble on to increase engine capacities. NA engines might be optimised for NEDC, but the scope of what can be done is far more limited.
2014 Renault Kangoo 1.6NA
If Renault were trying to be unrealistic with the Kangoo they were doing a very poor job of it.
My baby turbo Fiat Twinair is only driven in pretty much ideal conditions (country trips on weekends) and has yet to match NEDC. EOC and P&G don't work as there's too much enrichment when getting up to speed.
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That Kangoo engine is an old engine from the time, when cycle optimization was not at the same level where it is now. If you take some more modern N/A engines, they are right there at the same level as turbocharged engines.
Your Fiat is notorious for delivering not so good real world consumption. It uses a lot enrichment. Some more advanced small turbocharged engines need very little enrichment or don't need it at all. For example small turbocharged engines from VW, PSA and Toyota are very efficient. Of course it's their NEDC ratings are unrealistic, but also new N/A engines are just as cycle optimized.
Downsized engines not going anywhere. Only small diesels have problems with their NOx emissions. The miller cycle has increased the size of few engines, but at the same time we have much more engines which are getting smaller.