[nick3753]

Can't believe we are discussing MPG for a 100k 600 plus horsepower supercar.... What's this world coming too?

[Vigilante375]

Correct. If you spend the money to buy something like this or any sports car then who cares about the MPG. Only thing you need to know is power, weight, options and if it looks good.

[TSM330i]

Originally Posted by nick3753

Can't believe we are discussing MPG for a 100k 600 plus horsepower supercar.... What's this world coming too?

+1, but it always comes up and that's why all the manufacturers try to get the best MPG they can out of these cars.

I definitely agree with you totally. I have a coworker that owns a Prius. I have another coworker that owns a 2014 GT-R. After I drove the GT-R the guy with the Prius asked me "What kind of fuel mileage does the GT-R get?" I said "Who cares? That's not the point of the car."

I've tried hypermilling in my 330 and I was bored in about 2 minutes, so I just gave up. I also own a 2000 VW Golf GL with 218,000 miles on it as a beater. That's actually a little fun trying to see how good a fuel mileage I can get out of that little thing.

Bottom line: who cares about MPG! I get about 5.5mpg on the track with the 335 race car and my 330 gets about 8.7mpg LOL!

[MediaArtist]

Originally Posted by nick3753

Can't believe we are discussing MPG for a 100k 600 plus horsepower supercar.... What's this world coming too?

It probably only came up (like it always does in Corvette threads) because some ass nozzle probably said "Huh huh, Corvette? A chevy with an old ancient push rod engine!"

... then getting schooled on the fact that the old push rod is actually a very capable engine, smaller, lighter and produces more power than similarly sized OHC type engines WHILE getting great MPG.

[Viktimize]

Originally Posted by Vigilante375

I can tell you some reasons why since people are easy to judge.

1) No DCT
2) Not AWD
3) Ancient V8 technology
4) Built by GM or it's a Chevrolet
5) Lacks some sort of "creature" comfort

Thats just a start because then you'll find the purist saying that x car will never be outdone by y car.

Main complaint I have been reading is about it not being N/A. That's what the hardcore track guys want. In their minds the 427 was the best track engine to date. Which they are probably right about, but S/C is the only way Chevy could meet the MPG requirements they needed, and this car will mostly be bought by weekend drivers looking for a nice car to cruise around in. So they could probably care less if it is FI or not as long as it has the power they are looking for.

[Red Bread]

Originally Posted by MediaArtist

It probably only came up (like it always does in Corvette threads) because some ass nozzle probably said "Huh huh, Corvette? A chevy with an old ancient push rod engine!"

... then getting schooled on the fact that the old push rod is actually a very capable engine, smaller, lighter and produces more power than similarly sized OHC type engines WHILE getting great MPG.

Very true. It's also annoying to have a car that because of poor mileage and the common trait of sports cars, small fuel tanks, has the range of a crotch rocket.

[MisterSkiMask]

Originally Posted by Red Bread

Very true. It's also annoying to have a car that because of poor mileage and the common trait of sports cars, small fuel tanks, has the range of a crotch rocket.

Also true, the only thing my E60 M5 couldn't pass was a gas station.

[Year's_End]

Originally Posted by nick3753

Can't believe we are discussing MPG for a 100k 600 plus horsepower supercar.... What's this world coming too?

People we're debating the merits of the LS and LT's architecture. There's very little direct conversation regarding this Z06's fuel economy if you read the thread.

[TSM330i]

Maybe a Z06R is in the future!
http://www.corvetteforum.com/article...x-meant-track/

[MediaArtist]

Originally Posted by MisterSkiMask

Also true, the only thing my E60 M5 couldn't pass was a gas station.

This I like. Will use this in the future.

[TunedM2C]

Originally Posted by TSM330i

Maybe a Z06R is in the future!
http://www.corvetteforum.com/article...x-meant-track/

Sure, why not build this as well? I think corvette racing is going to yet again own their professional racing class.

[nick3753]

Originally Posted by Year's_End

People we're debating the merits of the LS and LT's architecture. There's very little direct conversation regarding this Z06's fuel economy if you read the thread.

I've been following the entire thread thanks. Just pointing out my observations. Sorry if I offended.

[Year's_End]

Originally Posted by nick3753

I've been following the entire thread thanks. Just pointing out my observations. Sorry if I offended.

Not at all, sorry if the reply came off snarky.

[nick3753]

Originally Posted by Year's_End

Not at all, sorry if the reply came off snarky.

No worries.

[swanson]

Originally Posted by Viktimize

Main complaint I have been reading is about it not being N/A. That's what the hardcore track guys want. In their minds the 427 was the best track engine to date. Which they are probably right about, but S/C is the only way Chevy could meet the MPG requirements they needed, and this car will mostly be bought by weekend drivers looking for a nice car to cruise around in. So they could probably care less if it is FI or not as long as it has the power they are looking for.

Correct. GM initially tried to make a higher HP NA engine, and they did, but it was efficient enough to certify. The best way to make the power while keeping the MPG requirements was FI. The supercharger is new and developed just for the Z06. It only sits 1" higher then the heads. Think about that. Its gonna be a monster on an engine in a monster of a car. I wouldnt doubt that when the numbers are certified and are released to the public that it will be greater then 640hp and 650lb-ft. All while getting over 25mpg. Crazy.

[Soorena]

Originally Posted by swanson

Correct. GM initially tried to make a higher HP NA engine, and they did, but it was efficient enough to certify. The best way to make the power while keeping the MPG requirements was FI. The supercharger is new and developed just for the Z06. It only sits 1" higher then the heads. Think about that. Its gonna be a monster on an engine in a monster of a car. I wouldnt doubt that when the numbers are certified and are released to the public that it will be greater then 640hp and 650lb-ft. All while getting over 25mpg. Crazy.

Positive displacements aren't good for MPGs though. They are always making boost. In lower rpms for improving fuel consumption you need to be off boost. A centri can do that, so as turbo. In older days my supercharged sbc 350 made the same amount of power that my NA 396ci stroker with heads setup made, while with the 396ci setup i could travel up to 40% more distance than the 350 setup before refueling. Not the best comparison since Eaton TVS is far more advanced than those old Mooneyhams however they share boost delivery character.

Originally Posted by MediaArtist

produces more power than similarly sized OHC type engines WHILE getting great MPG.

Yeah, let's ditch our 4v heads and go for 2v pushrods. While we are at it, how about a set of carbs? It's amazing what GM is doing with pushrod design, but let's not get carried away. More power than a similarly sized OHC? You wish. The ONLY, and i mean ONLY reason Corvettes are great at MPG is because of the gearing and also the TQ they make at low rpm. You can cruise around at 70 mph while the engine is basically idling and because of the large displacement they have enough guts to keep you moving. Rev it higher and watch how the fuel gauge needle drops.

[See5]

Originally Posted by Soorena

Positive displacements aren't good for MPGs though. They are always making boost. In lower rpms for improving fuel consumption you need to be off boost. A centri can do that, so as turbo. In older days my supercharged sbc 350 made the same amount of power that my NA 396ci stroker with heads setup made, while with the 396ci setup i could travel up to 40% more distance than the 350 setup before refueling. Not the best comparison since Eaton TVS is far more advanced than those old Mooneyhams however they share boost delivery character.

PD blowers in OEMs have had bypass valves for years now. You can easily drive around off boost in a ZR1. Done it many times. Not the most fun but I don't see why the C7Z couldn't hit 16/27mpg ratings from the EPA.

[MisterSkiMask]

Originally Posted by See5

PD blowers in OEMs have had bypass valves for years now. You can easily drive around off boost in a ZR1. Done it many times. Not the most fun but I don't see why the C7Z couldn't hit 16/27mpg ratings from the EPA.

this

[Soorena]

Originally Posted by See5

PD blowers in OEMs have had bypass valves for years now. You can easily drive around off boost in a ZR1. Done it many times. Not the most fun but I don't see why the C7Z couldn't hit 16/27mpg ratings from the EPA.

How they do that? If i'm not mistaken the MAF sensor is pre-supercharger and if you dump boost it would just run rich? How ECU measure the actual intake air flow then? Does it have a post-supercharger MAP sensor?

[tuj]

Yeah, let's ditch our 4v heads and go for 2v pushrods. While we are at it, how about a set of carbs? It's amazing what GM is doing with pushrod design, but let's not get carried away. More power than a similarly sized OHC? You wish. The ONLY, and i mean ONLY reason Corvettes are great at MPG is because of the gearing and also the TQ they make at low rpm. You can cruise around at 70 mph while the engine is basically idling and because of the large displacement they have enough guts to keep you moving. Rev it higher and watch how the fuel gauge needle drops.

http://www.epi-eng.com/piston_engine..._cup_to_f1.htm

The BMEP of a 'antiquated' pushrod, single-cam, 2-valve V8 engine is surprisingly good when properly developed. Chevy has put a lot of effort into flowing those LSx heads and figuring how how to get the most out of their 1960's technology. Heck they even have VVT finally.

[son_of_siggy]

Originally Posted by Soorena

How they do that? If i'm not mistaken the MAF sensor is pre-supercharger and if you dump boost it would just run rich? How ECU measure the actual intake air flow then? Does it have a post-supercharger MAP sensor?

Most run both a MAF and MAP. The rich condition would only appear briefly when you build boost and then suddenly close the throttle. We're talking very quick spikes. In bypass mode you're not building boost and bypassing the air, you're simply not building boost at all. Supercharger becomes a like a low resistance pulley.

[quagmire]

Originally Posted by Soorena

Yeah, let's ditch our 4v heads and go for 2v pushrods. While we are at it, how about a set of carbs? It's amazing what GM is doing with pushrod design, but let's not get carried away. More power than a similarly sized OHC? You wish. The ONLY, and i mean ONLY reason Corvettes are great at MPG is because of the gearing and also the TQ they make at low rpm. You can cruise around at 70 mph while the engine is basically idling and because of the large displacement they have enough guts to keep you moving. Rev it higher and watch how the fuel gauge needle drops.

OHV and OHC are both around the same age. So you're not going to win any latest tech argument. The first DOHC engine was made in 1912. First OHV was 1904 if my quick research is correct. Yes DOHC is technically newer, but in terms of DOHC being more modern, that 7 year difference when both motor designs are 100 years old is hardly significant. Both are old designs.

I think he was talking about physical size. A 6.2 liter DOHC V8 will be quite a bit bigger physically than the LT1/LT4 at the same displacement.