Do our G's have direct injection (injector that injects gas right into the combustion chamber)? I am confused some places say yes some places say no. On wiki is says some Hr engines have direct ignition is that the same? 07 G35s sedan 5at

 

i don't think so

 

vq35hr does not have DI... and THIS could be one reason

 

Interesting read .... thanks for posting.

 

I would love to see Infiniti with direct injection engine in the new models. If carbon build up is the only big drawback on the DI then the easy work around is the block the EGR valve off. Back in the day when I modified my Eclipse, I blocked that EGR valve off and my intake manifold stayed cooler.

 

Direct ignition means the engine has coilpacks for the spark plugs rather than a distributor.

 

I've got a 335i w/ direct injection. And the biggest drawback of DI is the carbon as everyone is stating, but it's not as big of an issue as people make it out to be. Just means that once in a while, the carbon has to be cleaned off. Not that expensive and doesn't have to be done that frequently. Mine has 39K on it and the valves are still clean. Some people need it sooner, but it's still not as if it has to be done every 5K.

I suppose another downside could be the high pressure fuel pump needed. That's another point of failure on BMW's and VW/Audi's. Lexus' way of using 2 sets of injectors does overcome the carbon buildup, but somewhat defeats the purpose of directly injecting fuel into the cylinder. I guess it doesn't really matter much - between my old IS350, my current FX, and current 335i they all have different fuel injection systems from DI to hybrid to non DI and they all drive about the same.