C4 General Discussion General C4 Corvette Discussion not covered in Tech

Ground Effects

Thread Tools
 
Search this Thread
 
Old Sep 2, 2010 | 01:31 AM
  #201  
uptown193's Avatar
uptown193
Drifting
10 Year Member
 
Joined: Apr 2008
Posts: 1,815
Likes: 10
From: New York New York
Default

Originally Posted by Jon Hekking
Oh don't start in again, that was humorous..............
Reply
Old Sep 2, 2010 | 02:10 AM
  #202  
Jon Hekking's Avatar
Jon Hekking
Race Director
15 Year Member
Liked
Loved
Community Favorite
 
Joined: Jul 2007
Posts: 15,116
Likes: 283
From: Salt Lake City Utah
2020 C3 of the Year Finalist - Unmodified
2019 C3 of Year Finalist (stock)
Default

Originally Posted by uptown193
Clever, don't you have a bar examine to study for? I've owned and restored more Vettes than you'll ever come close to. You've riced out 1 C4 so far. Get over yourself......

Now go think of another snappy comeback laced with rambling rants.
Reply
Old Sep 2, 2010 | 02:30 AM
  #203  
uptown193's Avatar
uptown193
Drifting
10 Year Member
 
Joined: Apr 2008
Posts: 1,815
Likes: 10
From: New York New York
Default

Originally Posted by Jon Hekking
Clever, don't you have a bar examine to study for? I've owned and restored more Vettes than you'll ever come close to. You've riced out 1 C4 so far. Get over yourself......

Now go think of another snappy comeback laced with rambling rants.

Last edited by uptown193; Sep 2, 2010 at 02:33 AM.
Reply
Old Sep 2, 2010 | 08:46 AM
  #204  
j-vette's Avatar
j-vette
Le Mans Master
10 Year Member
 
Joined: Jul 2009
Posts: 8,041
Likes: 2
From: EOF ★ Kaliforniastan ★
St. Jude Donor '10
Default

Originally Posted by PLRX


Originally Posted by uptown193
Oh I see the children are back.
I don't think that was directed at you. PLRX has many paint chops in several threads...

Originally Posted by Jon Hekking
that was humorous..............
Yes it was
Reply
Old Sep 2, 2010 | 09:18 AM
  #205  
Jon Hekking's Avatar
Jon Hekking
Race Director
15 Year Member
Liked
Loved
Community Favorite
 
Joined: Jul 2007
Posts: 15,116
Likes: 283
From: Salt Lake City Utah
2020 C3 of the Year Finalist - Unmodified
2019 C3 of Year Finalist (stock)
Default

Originally Posted by uptown193
Yup, snappy comeback.
Reply
Old Sep 2, 2010 | 09:24 AM
  #206  
SuperL98's Avatar
SuperL98
Drifting
20 Year Member
All Eyes On Me
Photogenic
Top Answer: 1
 
Joined: Jun 2001
Posts: 1,704
Likes: 459
From: Mass Mass
Default

Reply
Old Sep 2, 2010 | 09:41 AM
  #207  
onedef92's Avatar
onedef92
Team Owner
20 Year Member
 
Joined: Oct 2000
Posts: 96,443
Likes: 9
From: Fort Knox, KY
Cruise-In IV Veteran
Cruise-In VI Veteran
Cruise-In VII Veteran
Cruise-In VIII Veteran
Default








Some more funky dope scratches....

Last edited by onedef92; Sep 2, 2010 at 09:56 AM.
Reply
Old Sep 2, 2010 | 09:47 AM
  #208  
thedudeman321's Avatar
thedudeman321
Racer
 
Joined: Jun 2010
Posts: 402
Likes: 1
From: Tabernacle NJ
Default

I call Shenanigans.

Get out the brooms.
Reply
Corvette Stories

The Best of Corvette for Corvette Enthusiasts

story-0

8 Most "Only Corvette Owners Understand" Quirks and Problems

 Pouria Savadkouei
story-1

10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

 Joe Kucinski
story-2

How Much Horsepower Every Corvette Engine "LOST" in 1972

 Joe Kucinski
story-3

Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

 Michael S. Palmer
story-4

Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

 Joe Kucinski
story-5

150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

 Joe Kucinski
story-6

8 Coolest Corvette Pace Cars (and Replicas) of All Time

 Verdad Gallardo
story-7

Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)

 Joe Kucinski
story-8

Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!

 Verdad Gallardo
story-9

Top 10 Corvettes Coming to Mecum Indy 2026!

 Brett Foote
Old Sep 2, 2010 | 09:52 AM
  #209  
dogfish246's Avatar
dogfish246
Safety Car
10 Year Member
 
Joined: Dec 2008
Posts: 3,588
Likes: 10
From: North New Jersey
Default

Its not a Vette but I like it!
Reply
Old Sep 2, 2010 | 09:58 AM
  #210  
thedudeman321's Avatar
thedudeman321
Racer
 
Joined: Jun 2010
Posts: 402
Likes: 1
From: Tabernacle NJ
Default

That is.....was? A vette. You can still see it in the A and B pillar's..
Reply
Old Sep 2, 2010 | 09:59 AM
  #211  
onedef92's Avatar
onedef92
Team Owner
20 Year Member
 
Joined: Oct 2000
Posts: 96,443
Likes: 9
From: Fort Knox, KY
Cruise-In IV Veteran
Cruise-In VI Veteran
Cruise-In VII Veteran
Cruise-In VIII Veteran
Default

Originally Posted by dogfish246
Its not a Vette but I like it!

It is a Vette. Body kit. Peep the A and B-pillars. Not to mention the removeable targa top. Unmistakably C4.

Last edited by onedef92; Sep 2, 2010 at 10:01 AM.
Reply
Old Sep 2, 2010 | 10:12 AM
  #212  
dogfish246's Avatar
dogfish246
Safety Car
10 Year Member
 
Joined: Dec 2008
Posts: 3,588
Likes: 10
From: North New Jersey
Default

Originally Posted by onedef92
It is a Vette. Body kit. Peep the A and B-pillars. Not to mention the removeable targa top. Unmistakably C4.
I know its a Vette underneath, I meant its not a "Vette" in the sense that it doesnt even look like a Corvette, it looks like a TVR...
Reply
Old Sep 2, 2010 | 10:40 AM
  #213  
bb62's Avatar
bb62
Le Mans Master
20 Year Member
Active Streak: 30 Days
Active Streak: 60 Days
Top Answer: 1
 
Joined: Dec 2004
Posts: 5,230
Likes: 419
Default

Originally Posted by RedLS1GTO
I agree that it doesn't reduce drag... but with the center piece out of my car it ran about 10 degrees hotter water temps and 20 degrees hotter oil temps (I have an oil cooler up there too) on the same day with the same conditions. Look at the factory air dam... at the angle that it comes down it has pretty much eliminated laminar flow up into the radiator on its own. Just judging by my eyeball engineering I don't think that the Greenwood nose necessarily improves laminar flow but I think that it most definitely forces more air up into the radiator "cavity".

I also noticed a huge difference at speed in how planted the nose was with the center piece in place as compared to it out. If you look at the pic of the car at speed (~130 mph)you can see how far it pushed down... aka downforce. For reference, I weigh about 200 lbs and it doesn't push down that far with me standing on it. On top of that, I guarantee that the hood louvers add quite a bit of downforce at speed. I had an oil leak at one point that created smoke under the hood that vented out through those louvers. The flow across and out of them was almost perfectly laminar and was pretty clearly a "downforce" flow.



Long story short is from my own experience...
downforce - yes.
help cooling - yes.
reduce drag - nope.
I don't have a problem with what you are saying. My post was primarily to note that there is no free lunch. From an engineering standpoint there are always trade-offs.

As for the cooling thing, I can buy that there is a certain amount of air channeling that aids cooling, but also at a significant further hit to drag.
Reply
Old Sep 2, 2010 | 11:02 AM
  #214  
onedef92's Avatar
onedef92
Team Owner
20 Year Member
 
Joined: Oct 2000
Posts: 96,443
Likes: 9
From: Fort Knox, KY
Cruise-In IV Veteran
Cruise-In VI Veteran
Cruise-In VII Veteran
Cruise-In VIII Veteran
Default

Originally Posted by dogfish246
I know its a Vette underneath, I meant its not a "Vette" in the sense that it doesnt even look like a Corvette, it looks like a TVR...
Thanks for the clarification. I didn't think you'd get caught slippin.'
Reply
Old Sep 2, 2010 | 11:57 AM
  #215  
RedLS1GTO's Avatar
RedLS1GTO
Race Director
20 Year Member
Veteran: Navy
Photogenic
Top Answer: 1
 
Joined: Jul 2003
Posts: 12,742
Likes: 43
From: Color my life with the chaos of trouble.
Default

Originally Posted by bb62
I don't have a problem with what you are saying. My post was primarily to note that there is no free lunch. From an engineering standpoint there are always trade-offs.

As for the cooling thing, I can buy that there is a certain amount of air channeling that aids cooling, but also at a significant further hit to drag.
There are trade offs for sure. The downforce aspect of course adds drag .That is simple aerodynamics but I don't agree about the significant further hit to drag in regards to the direction of cooling air in this case. When you look at the stock design you have what is basically a 90 degree wall formed by the stock air dam. Rather than directing air flow it seems to me like it simply creates a big high pressure area (i.e.. lots of drag) that forces air up into the bottom and through the radiator. At speed the stock air dam has a tendency to bend down which would actually direct air downward and produce lift (not a good thing). With the leading wing out there, it looks to me like it actually creates a laminar flow all to the way to the radiator, and both the upper and lower surfaces direct air up and around the stock dam as illustrated in the drawing and would direct a good portion of that air into the radiator cavity without hitting that huge cd stock air dam.



I know that what I have said is just my eyeball engineering and to really know the truth you would have to have a lot of money and a wind tunnel but I wouldn't be surprised if the Greenwood nose actually does reduce overall drag when you consider the amount of drag reduction by eliminating most of the front air dam and the removal of that huge high pressure area caused by it. It has been documented in the past that C4 noses have a tendency to get light at high speeds. The cause of that is that high pressure pocket under the nose that essentially pushes the nose of the car up (since obviously the ground can't go down). It also significantly reduces the amount of air flowing under the car as a whole by lowering the level of the nose. Essentially it takes less air, and flows it more efficiently into the radiator.

I don't usually but into the hype put out by a company about how well it's products perform but I do think that Greenwood most likely knows what they are doing when it comes to aero. They have been doing it since the 70s and most importantly, unlike the vast majority of things out there that are developed for looks, the Greenwood parts were originally developed to improve performance on track cars and these exact same body parts were used and developed for the Bridgestone Supercar series (and performed phenomenally). I'm not the expert on this, especially with no numerical data, but I do have an aero engineering background and by appearances alone it really does look like this one could do what they claim.

Keep in mind also that I am ONLY talking about the G4R kit and not the other various Greenwood kits out there.

I apologize if my reply is hard to follow and jumps around... I wrote it in about 4 different stages between actually trying to accomplish things at work.
Reply
Old Sep 2, 2010 | 12:17 PM
  #216  
PLRX's Avatar
PLRX
Team Owner
 
Joined: Aug 2005
Posts: 34,988
Likes: 515
From: Riverside County Southern California
Co-winner 2020 C4 of the Year - Modified
2018 Corvette of Year Finalist
2017 C4 of Year
2016 C7 of Year Finalist
St. Jude Donor '09 thru '20
Default



I'm not into ground FX but, this one is not as big, not bad looking and he doesn't have to worry about driveways, pot holes or speed bumps.
Reply
Old Sep 2, 2010 | 12:19 PM
  #217  
j-vette's Avatar
j-vette
Le Mans Master
10 Year Member
 
Joined: Jul 2009
Posts: 8,041
Likes: 2
From: EOF ★ Kaliforniastan ★
St. Jude Donor '10
Default

Originally Posted by RedLS1GTO
I apologize if my reply is hard to follow and jumps around... I wrote it in about 4 different stages between actually trying to accomplish things at work.
I hate when stuff gets in the way of CF
Reply

Get notified of new replies

To Ground Effects

Old Sep 2, 2010 | 12:59 PM
  #218  
pologreen1's Avatar
pologreen1
Team Owner
15 Year Member
 
Joined: Dec 2007
Posts: 20,974
Likes: 261
Default

Originally Posted by dogfish246
Its not a Vette but I like it!
Reply
Old Sep 2, 2010 | 02:04 PM
  #219  
uptown193's Avatar
uptown193
Drifting
10 Year Member
 
Joined: Apr 2008
Posts: 1,815
Likes: 10
From: New York New York
Default

Originally Posted by SuperL98
Thank you very much SuperL98. See now here is a mature man who was nice enough to do it for me.

Last edited by uptown193; Sep 2, 2010 at 02:23 PM.
Reply
Old Sep 2, 2010 | 02:05 PM
  #220  
uptown193's Avatar
uptown193
Drifting
10 Year Member
 
Joined: Apr 2008
Posts: 1,815
Likes: 10
From: New York New York
Default

Originally Posted by Jon Hekking
Yup, snappy comeback.

Last edited by uptown193; Sep 2, 2010 at 02:23 PM.
Reply



All times are GMT -4. The time now is 01:22 PM.

story-0
8 Most "Only Corvette Owners Understand" Quirks and Problems

Slideshow: These are the quirks, annoyances, and oddly lovable problems that every Corvette owner eventually learns to live with.

By Pouria Savadkouei | 2026-05-28 09:31:39


VIEW MORE
story-1
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

Slideshow: 10 reasons why the C6 Z06 is still a performance benchmark after 20 years.

By Joe Kucinski | 2026-05-27 17:20:09


VIEW MORE
story-2
How Much Horsepower Every Corvette Engine "LOST" in 1972

Slideshow: How much horsepower every Corvette engine lost in 1972.

By Joe Kucinski | 2026-05-27 16:54:53


VIEW MORE
story-3
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

Slideshow: How to Protect A Convertible Top: 10 DOs & DON'Ts

By Michael S. Palmer | 2026-04-03 00:00:00


VIEW MORE
story-4
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

Slideshow: The 10 most explosive Corvettes ever built based on power-to-weight ratio.

By Joe Kucinski | 2026-05-20 07:23:03


VIEW MORE
story-5
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

Slideshow: From C1 to C8 we compare every Corvette generation by the numbers.

By Joe Kucinski | 2026-05-12 16:54:12


VIEW MORE
story-6
8 Coolest Corvette Pace Cars (and Replicas) of All Time

Slideshow: Some Corvette pace cars became collectible legends, while others perfectly captured the look and attitude of their era.

By Verdad Gallardo | 2026-05-11 09:50:51


VIEW MORE
story-7
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)

Slideshow: Ranking the top 10 Corvette engines by torque output.

By Joe Kucinski | 2026-05-05 11:58:09


VIEW MORE
story-8
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!

Slideshow: A Corvette pace car nearly matching IndyCar speeds sounds exaggerated, until you look at the numbers.

By Verdad Gallardo | 2026-05-04 20:03:36


VIEW MORE
story-9
Top 10 Corvettes Coming to Mecum Indy 2026!

Among a rather large group of them.

By Brett Foote | 2026-05-04 13:56:44


VIEW MORE