C7 General Discussion General C7 Corvette Discussion not covered in Tech
Sponsored by:
Sponsored by:

How GM’s Corvette engineers pulled off the impossible

Thread Tools
 
Search this Thread
 
Old 07-22-2013, 09:29 AM
  #1  
Quick Silver Z
Team Owner

Thread Starter
 
Quick Silver Z's Avatar
 
Member Since: Mar 2007
Location: Right Corner Pocket of Illinois
Posts: 32,282
Received 1,497 Likes on 1,008 Posts
No-IL Events Coordinator
2020 C6 of the Year Finalist - Unmodified
2020 Corvette of the Year Finalist (appearance mods)
C6 of Year Winner (appearance mods) 2019
2018 C6 of Year Finalist
St. Jude Donor '12-'13-'14-'15-'16-'17-'18-'19-'20-'21-'22-'23-'24


Default How GM’s Corvette engineers pulled off the impossible

http://www.digitaltrends.com/cars/46...he-impossible/
Old 07-22-2013, 10:44 AM
  #2  
zland
Drifting
 
zland's Avatar
 
Member Since: Sep 2007
Location: Oceanside Ca
Posts: 1,265
Received 608 Likes on 191 Posts

Default

Originally Posted by Quick Silver Z
The C6 already got relatively good mpg. The C7 is getting better but lets not get carried away, it is just a few mpg = article is a bit hype to me.
Old 07-22-2013, 10:53 AM
  #3  
Bill17601
AIR FORCE VETERAN
Support Corvetteforum!
 
Bill17601's Avatar
 
Member Since: Nov 2009
Location: Pennsylvania
Posts: 6,223
Received 439 Likes on 196 Posts

Default

The fact that the car makes 460 HP and gets 30 MPG is not hype it is good engineering. That is more HP and more MPG then any other Corvette in history. You might not think that is a big deal but it surly is amazing. What that means it will kick your LS3 Corvettes a$$ and get better millage doing it.
Old 07-22-2013, 11:04 AM
  #4  
CPhelps
Drifting
 
CPhelps's Avatar
 
Member Since: Oct 2006
Location: Bristol, VT
Posts: 1,370
Received 303 Likes on 173 Posts

Default

So it makes ~7.7% more power while returning ~11% better highway fuel economy and ~6% city fuel economy. Seems pretty good to me.
Old 07-22-2013, 11:13 AM
  #5  
red2012
Safety Car
 
red2012's Avatar
 
Member Since: Dec 2011
Location: New Rochelle N.Y. 2013 Grand Sport
Posts: 3,608
Likes: 0
Received 13 Likes on 11 Posts
Default

Originally Posted by Bill17601
. What that means it will kick your LS3 Corvettes a$$ and get better millage doing it.
No wondering the bickering never ends. I took all of two post for someone to slam the C6 for no good reason. Not called for and nothing to do with topic.
Old 07-22-2013, 11:18 AM
  #6  
truth.b
Drifting
 
truth.b's Avatar
 
Member Since: Mar 2012
Location: Raleigh North Carolina
Posts: 1,307
Received 119 Likes on 91 Posts

Default I'm glad for the added MPG, but a bit surprised with the publics response

Originally Posted by zland
The C6 already got relatively good mpg. The C7 is getting better but lets not get carried away, it is just a few mpg = article is a bit hype to me.
From the article:
"With jaw dropped firmly on the floor, I jumped on the horn with Chevrolet’s Bala Murthy, ... to find out how the normally thirsty Corvette’s fuel-saving sorcery was accomplished.

First of all that is a terrible sentence and secondly it still surprises me how many in the public don't know about the fuel efficiency of Corvette's (particullarly C5 & C6). It makes me wonder if GM had published the Standard Coupe's MPG better would they have sold more....
Old 07-22-2013, 11:18 AM
  #7  
JoesC5
Team Owner
 
JoesC5's Avatar
 
Member Since: Sep 1999
Location: Springfield MO
Posts: 41,733
Received 1,699 Likes on 1,213 Posts

Default

Originally Posted by Bill17601
The fact that the car makes 460 HP and gets 30 MPG is not hype it is good engineering. That is more HP and more MPG then any other Corvette in history. You might not think that is a big deal but it surly is amazing. What that means it will kick your LS3 Corvettes a$$ and get better millage doing it.


At this point, the LT1 looks to be a winner.
Old 07-22-2013, 11:31 AM
  #8  
Lavender
Melting Slicks
 
Lavender's Avatar
 
Member Since: Jan 2013
Posts: 2,732
Received 320 Likes on 172 Posts

Default

Originally Posted by RedThunderbolt
Yea but its running on 4 cyl at that point no? Isn't the C6 pulling 27 mpg on all 8?
Is the number of cylinders relevant? Or you are just trying to stir the pot?
Old 07-22-2013, 11:44 AM
  #9  
Kappa
Melting Slicks
 
Kappa's Avatar
 
Member Since: Aug 2005
Posts: 2,826
Received 530 Likes on 234 Posts

Default

Originally Posted by RedThunderbolt
Not relevant? Its burning 1/2 the fuel a C6 burns on the hwy in 4 cly mode but only gets a couple mpg more? Think about that.
You might want to read up a bit more on AFM.
Old 07-22-2013, 11:47 AM
  #10  
Kappa
Melting Slicks
 
Kappa's Avatar
 
Member Since: Aug 2005
Posts: 2,826
Received 530 Likes on 234 Posts

Default

Originally Posted by zland
The C6 already got relatively good mpg. The C7 is getting better but lets not get carried away, it is just a few mpg = article is a bit hype to me.
Not hype at all. Engineers are going to great lengths just to gain .5 mpg these days. Just look at the move to electric power steering. For the C7 to gain power, performance and fuel economy while experiencing weight creep over the C6 is very impressive.
Old 07-22-2013, 11:48 AM
  #11  
Mike Mercury
Team Owner
 
Mike Mercury's Avatar
 
Member Since: Apr 2001
Location: S.W. Ohio. . . . . . NRA Life Member
Posts: 54,199
Received 173 Likes on 107 Posts

Default

Originally Posted by zland
article is a bit hype to me.
granted, it is more an "infomercial" than a serious review. But it's still great to read - for those liking the C7
Old 07-22-2013, 11:50 AM
  #12  
Greg00Coupe
Race Director
 
Greg00Coupe's Avatar
 
Member Since: Aug 1999
Location: Bluffton SC via Canton Oh
Posts: 11,351
Received 1,981 Likes on 1,141 Posts

Default

It's all about the money to me..........They pack that much HP into it and save me a gas guzzer tax.........you go GM!!!!

Pay 3,4 8, K as a tax........ and get what for that?
Old 07-22-2013, 11:56 AM
  #13  
BlueOx
Race Director
 
BlueOx's Avatar
 
Member Since: Feb 2012
Posts: 10,776
Likes: 0
Received 6 Likes on 6 Posts
Default

Originally Posted by RedThunderbolt
Yea but its running on 4 cyl at that point no? Isn't the C6 pulling 26 mpg on all 8?
That just goes to show how unnecessary those other 4 cyl were at 60-70!

Remember that the C7 has more hp and yet will get a lot better mpg on the highway. I'm guessing the average owner who is trying will average 35+ at 70 on the freeway with the manual in 7th gear.

This is all far from impossible and that's good news since the Corvette has to get significantly better mpg in the years to come.

Last edited by BlueOx; 07-22-2013 at 12:00 PM.
Old 07-22-2013, 11:56 AM
  #14  
Lavender
Melting Slicks
 
Lavender's Avatar
 
Member Since: Jan 2013
Posts: 2,732
Received 320 Likes on 172 Posts

Default

Originally Posted by Kappa
You might want to read up a bit more on AFM.

Old 07-22-2013, 11:58 AM
  #15  
MikeyTX
Team Owner

Support Corvetteforum!
 
MikeyTX's Avatar
 
Member Since: Sep 2005
Location: Big Bend Country, TX
Posts: 29,114
Received 2,186 Likes on 1,337 Posts
St. Jude Donor '06-'07-'08-'09-'10-'11-'12-'13-'14-'15- '16-'17-‘18-‘19-'20-'21
NCM Lifetime Member


Default

Meh ! .............................. Damn It Bowling Green .............. I want the dang car ...................... NOW !
Old 07-22-2013, 11:58 AM
  #16  
Snorman
Scraping the splitter.
Support Corvetteforum!
 
Snorman's Avatar
 
Member Since: Jun 2005
Posts: 8,115
Received 1,028 Likes on 486 Posts
St. Jude Donor '13-'14-'15

Default

Originally Posted by red2012
No wondering the bickering never ends. I took all of two post for someone to slam the C6 for no good reason. Not called for and nothing to do with topic.
It actually only took all of one post for somebody to bring up the C6 and denounce the advancements in fuel economy of the C7. I guess you skimmed right over that post.

S.
Old 07-22-2013, 11:59 AM
  #17  
Mike Mercury
Team Owner
 
Mike Mercury's Avatar
 
Member Since: Apr 2001
Location: S.W. Ohio. . . . . . NRA Life Member
Posts: 54,199
Received 173 Likes on 107 Posts

Default

Originally Posted by RedThunderbolt
Yea but its running on 4 cyl at that point no? Isn't the C6 pulling 26 mpg on all 8?
Originally Posted by Kappa
You might want to read up a bit more on AFM.


it's not burning half the fuel; the load is not halved.

And there's more drag on the engine - having to rotate "dead mass" (non functioning cylinders).

AFM does help; but not to the extent you are hoping it does.

Get notified of new replies

To How GM’s Corvette engineers pulled off the impossible

Old 07-22-2013, 12:03 PM
  #18  
Big Dan 427
Safety Car
 
Big Dan 427's Avatar
 
Member Since: Aug 2012
Location: Danbury CT
Posts: 4,377
Likes: 0
Received 1 Like on 1 Post
Default

Not that big a deal IMO. The Corvette is a 3300lb. aerodynamically designed vehicle and the hp/epa have not changed much from the predeccessor. With all of the new electronics it should have been better. The 4300lb. Acura MDX increased its highway mpg by 6mpg in part by adding DI, VCM and drive by wire. The front wheel drive gets 28 on the highway (one more) than the AWD. Oh and Acura shaved 275 pounds out of the old car, so it sure isn't impossible to cut fuel usage.
Old 07-22-2013, 12:09 PM
  #19  
Snorman
Scraping the splitter.
Support Corvetteforum!
 
Snorman's Avatar
 
Member Since: Jun 2005
Posts: 8,115
Received 1,028 Likes on 486 Posts
St. Jude Donor '13-'14-'15

Default

Originally Posted by Mike Mercury


it's not burning half the fuel; the load is not halved.

And there's more drag on the engine - having to rotate "dead mass" (non functioning cylinders).

AFM does help; but not to the extent you are hoping it does.
Exactly.
It's going to be interesting to see how creative manufacturers have to get in coming years to meet CAFE '16. I think AFM and DI are going to be just the beginning.
S.
Old 07-22-2013, 12:17 PM
  #20  
zland
Drifting
 
zland's Avatar
 
Member Since: Sep 2007
Location: Oceanside Ca
Posts: 1,265
Received 608 Likes on 191 Posts

Default

Originally Posted by Bill17601
The fact that the car makes 460 HP and gets 30 MPG is not hype it is good engineering. That is more HP and more MPG then any other Corvette in history. You might not think that is a big deal but it surly is amazing. What that means it will kick your LS3 Corvettes a$$ and get better millage doing it.
I understand it is good, just think it is not "pulling off the impossible" to redesign a motor & get "7.7% more power while returning ~11% better highway fuel economy and ~6% city fuel economy" as posted above.

I think some of you guys are a bit too sensitive. The fact is just about every time a car manufacture redesigns a motor, these type of results are common more then not (more hp + better mpg) & that is the basis for me stating "pulled off the impossible" is more hype than anything to me. I understand they want to market the car to sell them but lets be real about what is normal engineering & what is considered the impossible. It seems like to me cars using Direct Injection get about 10-15% more HP so if tuned to improve mpg, getting about half that hp gain seems like a NORMAL trade off/outcome.

I remember a number of people questioning why GM was not able to get more hp out of this motor - remember when a lot of people were predicting 480-500+ hp before we knew the numbers?

The shift I have seen is when the initial designs were coming out & less data was know, people were not as invested in the final product & a broader range of opinions were being accepted. Now, many have fell in love with the car, ordered it, & it seems like any discussion becomes a situation where people get really upset if anyone states anything less then the C7 is the best car ever produced, completely different than any Corvette ever designed, etc.


Quick Reply: How GM’s Corvette engineers pulled off the impossible



All times are GMT -4. The time now is 04:42 AM.