Quote:
Originally Posted by NoHaveMSG
You do know that direct injection is one of the reasons we are able to run these high compression ratio's right? With having the port injectors it also keeps the intake ports clean and resolves the issue with just running direct injection. The D4s system is borrowed from Lexus and the reason the first gen was able to hit it's hp/liter that they were looking for while still meeting emission requirements. It's pretty ingenious and most importantly, trouble free.
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And other OEMs are starting to use similar systems after all the issues with the intake tracts and valves getting gunked up by just using DI.