I would not be buying this car with that HP. We would be like a Honda then. I really think it should have more.

 

Nissan/ Infiniti should change the compression ration and go with FI.

 

Lowering compression would lessen throttle response. The N54 uses high compression, which is partially why it feels so responsive.

Honestly, I would miss the power less than the extra 3-4k I'd save on a G25. SOB now it has me seriously thinking if I should wait on buying a TDI.

 

I plan on going FI so I think it won't matter. I like the ration in the fact that you don't need so much boost to produce allot of HP. 12psi and GT28 .88 get you 600+. Our car is compatable with all the FI cars out there.... BMW 335i

 

I bought the car more for design, comfort and handling than for pure power. I do want fairly quick acceleration for idiot avoidance on the highway, but I've had that in cars with less hp than we have.

I would expect to pay a little less but yes, I would still have been very interested in the car with less muscle.

 

I think I would have also. The car is just plan beautiful.

 

how bout just switching to direct injection, Infiniti? easy horsepower and no lost mpg.

 

Yeah, the only problem with direct injection is that everyone seems to be having serious carbon build-up issues once the engines get some miles on them. Just look at how bad of a problem Audi is having....

The fact that the VQ isn't direct injection is one of the major reasons I'm going with the Infiniti in the first place!

 

The problem is that in non-DI engines the fuel spray "washes" thew valves and prevents carbon build up. In DI engines this doesn't happen.

I've read that some manufacturers are experimenting with adding "secondary fuel injectors" whose sole purpose is to spray the intake vales with a bit of fuel every so often to prevent carbon build up.

 

Yeah, I know...I've followed the whole direct injection debacle for quite some time now. Adding another injector to "wash" the intake valve seems silly because there would have to be one injector added per cylinder....and that would be in addition to the direct injection injectors already in the engine. Seems like adding port injectors would defeat the purpose of direct injection, unless they were used on a very light duty cycle or only when PCV or EGR gases are flowing into the combustion chamber.

I think the solution will involve a way to re-engineer the way PCV and EGR is routed back into the combustion chamber. Either way, it's a serious problem and there seems to be no easy way to solve it right now. I'm just glad Nissan hasn't gone DI with the VQ engine.

 

I've seen some of the pictures at vwvortex.com and it's insane. Cars with 80K on them look like they have 40 year old engines.

From what I've read about the "secondary injectors is that they would probably be located higher up in the intake manifold so you would only nee one or two per bank of cylinders and they're light duty only firing some of the time. However, that all seems to add unnecessary complication. You're probably right with the EGR/PCV solution.

The new VK V8 in the M56 and QX56 has DI so I imagine it'll eventually come to the VQ.

 

without losing the audience with technical jargon could either of you guys explain how DI leads to carbon buildup? TIA

 

Cliff's Notes version: Port fuel injectors spray fuel past the intake valve, effectively cleaning it as it goes. Direct injection injectors spray fuel directly into the combustion chamber, thus "skipping" the intake valve. Over time, carbon deposits build up on the intake valve because the fuel is not passing over it (and cleaning it) on direct injection engines.

 

Well Stated MSCA!

 

G = needs more power lol