Yup, forced induction is great. But I'd still rather have a 6.2L V8 that I can turbocharge rather than having a 3.6L V6 that is already turbocharged.

There is no replacement for displacement + a turbo (or two).

 

Turbocharging a high compression 6.2 = trouble. That's if you can fit the turbos on the car. Unless your talking an STS type turbo kit with 5 miles of plumbing it doesn't sound very feasible and will be very expensive.

 

I bet a Camaro with the Tahoe's 2 mode hybrid 6.0L could get 35mpg.

 

Who said anything about high compression? I think we are still operating from 2 very different view points.

You want something from the factory that is sufficient as is and meets all of your requirements (i.e. good power, decent gas mileage, reliability, etc.). I want something from the factory that has the potential to meet my requirements (i.e. big motor, strong tranny/rear, and enough room for a turbocharger setup), I couldn't possibly care less about the gas mileage because it takes gas to make horsepower. Swapping pistons for lower compression is fairly inexpensive, and if someone can squeeze a couple of turbochargers under the hood of a corvette I can certainly find a place for them in a camaro.

I understand your point and respect what you want, but if I had my way it is just not enough.

 

different strokes for different folks. I need the good mileage so a turbo 6 with the power of a SB 8 sounds great to me. I do not plan on owning any 550+ hp monsters anytime in the near future, so a 6 with or without turbos that can make 400+ hp with boost factory or aftermarket is cool with me.

 

Honestly, a friend of mine has a Subaru Legacy GT (4 banger turbo) and barely gets any better gas mileage then my LT1 that has 75 more horsepower.

Buy a Toyota Prius if you want good gas mileage. Turbo V8 > All

 

well there could be something wrong with the car, or it could simply be the driver.

My wife averages 11mpg in our dodge durango, I avg 17.

 

It's an 05, runs great, he averages around 21 highway, 17 in the city. I get around 28 highway due to the 6 speed, not sure about around town.

A 4 cylinder is obviously going to get better gas mileage, but its still making high end power so its gas consumption is still going to be quite large.

Like I said, if you want better gas mileage, get an economy car.

 

Well an STI is an AWD vehicle so that basically sucks up a ton of gas. V6 Turbo Regals could get 27-28 on the hwy with a 4 speed auto, an LS1 with the same 4 speed auto gets 25. Camaro is lighter and much more aerodynamic. both run about the same. Hell a Mazda RX8 doesn't have a turbo and it gets worse mileage than a V8. We're not talking Subaru's and Mazda's however, we're talking GM turbo's. Heck get an SRT4 stay out of boost and see if you can't get 30mpg in the City! It's all in how you drive.

 

We all know having a performance car never results in good gas mileage. No matter what the car CAN get, you will still drive it harder then that.

Plus why waste the mileage on the nice car when you could just pick up a good gas mileage vehicle for cheap?

I will admit a turbo V6 would be a fun car to work with, but it shouldn't really be argued for its gas mileage.

Just turbo a V8 and be done with it. Sure, the gas mileage will hurt alittle (you can baby foot a V8 too, ya know) but you'll see tons more power.

 

It's not us (the consumer) who really need to worry about the mileage, but GM does have to think about ways to get better performance with more mileage.

 

Eh, if I want gas mileage I'll add another gear, or maybe a powerglide like they did with the 4+3 in the vette.

The other thing about the added displacement is when you do hit the 700-800 hp range the motor has better street manners than a *****-to-the-wall V6.

I hear what you're saying, that's why I have a 45-50mpg motorcycle.

 

That's only true w/o the turbo, I've personally seen wheel standing, 10sec GN's that had great street manners.(some approaching 1,000hp)
The ECM's could be set on 5 different power/boost levels.
Can't do that with NA...

I believe you. Those boxed fours in the Suby's are torquey but thirsty, add the AWD and performance gearing, and it moves pretty good but thirsty.

 

In case anyone is still wondering, the Global V6 family (which includes the LY7 & LTT) was designed for turbos. It even has 6 bolt main caps and a forged crank. The rods are “sinterforged” which sounds kinda sketchy, but hopefully GM will upgrade them for a turbo motor if they’re as bas as they sound.

The article I found only mentions 2.8 & 3.2 L turbo versions, but if they can achieve the same specific output as the LNF that would be 364 & 416 respectively (peak torque and peak HP are the same value on the LNF). The LTT seems to have all same the high tech goodies as the LNF (step-less VVT, DOHC, 4 valves, DI etc.) so I think that the same 130hp & 130 ft/lbs per liter is a reasonable goal.

http://autospeed.com/cms/A_1676/arti...popularArticle

And this second article says that a TT DI 3.6 would probably get better mileage than the NA DI 3.6. Obviously, a TT DI 3.2 would be even less thirsty.
http://autospeed.com/cms/A_109931/article.html

Sounds like a pretty good deal for those of us who want a powerful yet practical daily driver, if GM will build it. And you 500hp+ types will probably be happier with the GT500 fighter.

 

Nothing wrong with sintered metal rods. They work well with our old LT1/LT4 motors. They last a whole lot longer than the pistons anyway. There are guys running ~600hp on the stock crank and rods in those motors.

I'm curious about the "stepless VVT" in those motors. Is that just a constantly variable timing advance, or does it change the valve lift/cam profile also?