I think the reason why Honda didn't use direct injection in the K series is because direct injection requires clean fuel. They wouldn't have been able to sell K-series equipped cars in countries such as the middle east where the fuel has a high content of sulfur.
but here we are! Lexus IS250, Audi RS4, BMW M5, E90 3 series, VW Golf GTI have used direct injection to get a high compression ratio and therefore efficiency and power! If you see all these engines have break the 100Nm/litre mark, unlike the honda K24 who only gets 93Nm/litre. Not really bad I guess since the K24 is I4.
but here we are! Lexus IS250, Audi RS4, BMW M5, E90 3 series, VW Golf GTI have used direct injection to get a high compression ratio and therefore efficiency and power! If you see all these engines have break the 100Nm/litre mark, unlike the honda K24 who only gets 93Nm/litre. Not really bad I guess since the K24 is I4.
Those cars are not sold in countries that use poor quality fuels like south east asia. Anyway, direct injection is like VTEC. It's good, but you don't need it to make a good performing engine. Example, Legend's 3.5L V6 is SOHC (gasp!), regular fuel injected, requires only 91 RON and yet it makes 100 Nm/litre!
So whats the point of this new continuous VTEC? Just lower emissions and better fuel economy?
It doesnt necessarily make more peak horsepower, but it improves torque, efficiency, and smoothness over the whole rev range.
So instead of a classic VTEC engine giving you a big "kick in" at a fixed RPM like an on/off Light Switch, its more like a Volume Knob, giving you many smaller kick-ins spread over the RPM range, so to speak.
hectic lol.
Originally Posted by EuroDude
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