Print 112 comment(s) - last by 91TTZ.. on Sep 6 at 11:52 AM

Infiniti will turn to turbocharged 4- and 6-cylinder engines, hybrids, full electrics

"And another one gone, and another one gone / Another one bites the dust"
Well, it looks as though the recently approved CAFE standards that aim to increase automobile fuel economy to 54.5mpg by 2025 have claimed another victim. Infiniti currently has V8 engine options available in its M luxury sedan, FX crossover, and QX sport utility vehicles, but that likely won't be the case in future iterations of those vehicles.
According to a report by AutoGuide, increasingly stringent fuel economy and emissions regulations mean that V8 engines are no longer on the table for Infiniti vehicles. V8 engines have traditionally been available in luxury vehicles as a symbol of prestige and power, but Infiniti will look to new ways to bring powerful engines to its lineup while still keeping fuel economy in check.
“I don’t think any car that is on Infiniti drawing boards from here onwards we should expect a V8 to be included in that plan,” Johan de Nysschen, Infiniti's global president.
Infiniti's 5.0-liter V8 produces 385hp, its 5.5-liter V8 produces 420hp, and its 5.6-liter V8 (truck-based) produces 400hp.

Infiniti to say good-bye to V8 engines
There are numerous directions that Infiniti can take with the absence of a V8 engine. Automakers like Ford already have twin-turbocharged V6 engines that develop 365hp while still delivering respectable fuel economy. Even Hyundai is rumored to be getting in on the action with a twin-turbocharged 3.3-liter V6 which generates 395hp.
For entry-level and mid-range models will also see a shift in available engines as well. Infiniti's current workhorse engine is the 3.7-liter “VQ” V6, but Nissan is also working on a turbocharged four-cylinder engine to deliver comparable power and vastly improved fuel economy.
Other options for Infiniti include fully electric vehicles (like the LE Concept) and additional hybrid models (we’re hoping that Infiniti delivers a production version of the Emerg-E).
Infiniti isn't the only luxury maker to drop a V8 engine from its lineup. When Lexus redesigned its mid-range GS sedan, it dropped the 4.6-liter V8 engine option and instead launched the vehicle with a 3.5-liter V6 and a 3.5-liter V6/performance hybrid model for those that want the power of a V8.

Source: AutoGuide

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By 91TTZ on 9/4/2012 1:11:02 PM , Rating: 3
Looking at the big picture here, we have 3.5l V6s that put out the same or even more than their old larger V8s did. Who needs a V8?

The thing is that V8s aren't really any less fuel efficient than a 3.5L V6 that can produce the same power.

For example:
My 1991 300ZX TT with 3.0L TT V6, 300 HP stock gets 17/19/22 mpg:

2005 350Z with 3.5L NA V6, 300 HP stock gets 17/20/23 mpg:

2001 Corvette with 5.7L NA V8, 350 HP stock gets 17/20/26 mpg:

And just for kicks:
2006 Corvette Z06 with 7.0L NA V8, 505 HP gets 15/18/24 mpg:

Skyline GTR, 3.8L TT, 485 HP gets 16/18/21 mpg:
(I know that's AWD so it's at a disadvantage)

It doesn't look like the V8s do poorly in the fuel economy department for the power that they make. When you attempt to make that kind of power with smaller engines the fuel economy drops on them as well.

By theapparition on 9/4/2012 2:12:56 PM , Rating: 2
Excellent point.

I've yet to find a performance V6 that will provide better fuel economy than a V8 at similar power levels.

And when you get down to it, an engine is really an air pump. To get a specific amount of power, you need to pump a specific amount of air. Couple that with a stochiometric air:fuel ratio*, and it doesn't matter in the end whether it's a V6, V8 or V12. It all has to pump the same amount of air.

The differences now become the other tricks that can be done, such as lowering Cd and rolling resistance, optimizing the transmission gears and rear end for performance/efficiency, and other tricks like limiting pumping work and friction (where V8s are at a disadvantage).

The magic of forced induction (turbos/supercharging) is that it allows you to run a slightly more efficient engine during city/highway driving, then boosting the pressure only when going full throttle. There is certainly some advantages, but it also comes at a higher price, hotter and more structurally sound engine required, and higher complexity. But fuel economy doesn't change that significantly because turbos require a richer mixture.

*Typical 14.1:1 AFR for normal driving, but when going into PE mode (full throttle), the AFR needs to drop to protect the engine. Typically run much richer ~12.5:1. While turbo or supercharged cars must run even richer, dipping down close to 10:1.

By Manch on 9/4/2012 2:27:40 PM , Rating: 2
I run my car 11.8:1 I think that is more specific to what engine you're running. I have a 2.3 whipple running 16psi. Cant take it any higher without a race belt system. One thing I like about it over turbos is instant torque, no lag, make power at partial throttle. It's great for a street/strip car.

If I was doing a dedicated car for the strip, I'd probably run turbos. I dont do that 40 roll bullsh!t. Want to race, race from a dig.

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