HOME MAGAZINE FORUM RULES SPONSORS CONTACT
     
   
   
 
Go Back   CLASS RACER FORUM > Class Racer Forums > Stock and Super Stock Tech

Reply
 
Thread Tools Display Modes
Old 05-28-2018, 11:20 AM   #1
Chris Hill
Senior Member
 
Join Date: Jan 2002
Posts: 546
Default Real World Aerodynamics

Just curious how much aerodynamics help/hurt in drag racing?

Great example is A/SA class final between Larry Hill and Leonard Mattingly.

Hill has 70 cuda and Mattingly has 2000 Firebird. Both cars at same weight, so it's a great comparison.

Hill is 0.8 mph faster in 1/8 ,but Mattingly is 0.7 mph faster in 1/4. Mattingly increases 1.5 mph last half of track. I think that's a lot to make up last 1/2 of the track.

Hill 10.07 at 129.7 to Mattingly's 10.08 at 130.4 mph.

My gut says Hill makes slightly more hp by 1/8 mph, but the aerodynamics of newer and smaller car takes over after 100 mph.

Any SS guys have experience going from old school car to new jellybean car with same combo and weight?

Estimated coefficent of drag for 2000 camero is 0.34
Estimated coefficent of drag for 1979 mustang is 0.46
__________________
Chris Hill
https://ihmusedparts.com
Chris Hill is online now   Reply With Quote
Old 05-28-2018, 11:29 AM   #2
Kevin Panzino
Member
 
Kevin Panzino's Avatar
 
Join Date: Oct 2002
Location: Pittsburgh
Posts: 335
Default Re: Real World Aerodynamics

The Zaskowski's have a great video of father and son side by side heads up for class. The camera is in the camaro looking over at the Chevy II. The cars are extremely close together with the deuce actually gaining a tad on each gear change. Then around 800 ft ish, you watch the camaro begin to get ahead. I think its a great example of exactly what you are talking about. (Plus its an incredibly cool video anyway!!!!)

Kevin
Kevin Panzino is online now   Reply With Quote
Old 05-28-2018, 12:15 PM   #3
SSDiv6
VIP Member
 
Join Date: Feb 2003
Location: Peoria, Arizona
Posts: 1,931
Default Re: Real World Aerodynamics

Chris,
I have posted on this subject in the past.

In addition to poor frontal area Cd, after the launch until the 1/8, most cars are dealing with the ground effects. Due to poor Cd, some cars are more susceptible to ground effects than others.

After the 1/8, as speed increases, if your vehicle has a good Cd, the ground effects start to cancel and aerodynamics plays a major role to stabilize the vehicle and reducing drag while accelerating.

It is one of the reasons why you may have seen some cars porpoising down the track. The cause is ground effects not canceling while the car is accelerating due to both, poor aerodynamics and also the suspension not being properly adjusted. Porpoising also increases drag on the vehicle.
SSDiv6 is offline   Reply With Quote
Old 05-29-2018, 10:30 PM   #4
junior barns
Member
 
Join Date: Jun 2006
Posts: 493
Default Re: Real World Aerodynamics

Hi Chris. Back when top stock first came I remember Mat Morgan showing wind tunnel numbers between the new firebird and a 69 Camaro and a 69 corvette. His conclusion ( the best I remember) were that as long as no big head wind, the cars would not notice any difference on drag until they approached 130 mph. At that time he was driving a 69 Camaro. I'm sure he got the wind tunnel numbers from the manufacture . He also had numbers for the 69 mustang for the comparison. Wish I would have saved it!!
junior barns is offline   Reply With Quote
Old 05-29-2018, 11:34 PM   #5
Greenlight
Member
 
Join Date: Dec 2004
Posts: 149
Default Re: Real World Aerodynamics

Here are some drag coefficient values:

http://www.mayfco.com/tbls.htm
Greenlight is offline   Reply With Quote
Old 05-30-2018, 10:55 AM   #6
Myron Piatek
VIP Member
 
Join Date: Nov 2001
Location: Florida
Posts: 1,494
Default Re: Real World Aerodynamics

A Dodge Viper has a worse Cd than a Dodge p/u truck?!?
__________________
LOCOMOTION Racing
Myron Piatek is offline   Reply With Quote
Old 05-30-2018, 11:44 AM   #7
nickh
Senior Member
 
nickh's Avatar
 
Join Date: Sep 2010
Location: Houston,Texas
Posts: 514
Default Re: Real World Aerodynamics

Always been interested in aero myself, my 73 nova bracket car must be in the .60's LOL
nickh is online now   Reply With Quote
Old 05-30-2018, 02:10 PM   #8
Randall Klein
Senior Member
 
Join Date: Dec 2002
Location: Lincoln, Nebraska
Posts: 639
Default Re: Real World Aerodynamics

FWIW
When Warren Johnson was racing the Cutlass he wrote an artice in ND about aero, if I recall correctly he said it didn't make much difference until tje very end at 200mph

Of course he was representing Oldsmobile (and the Cutlass)....those Cutlass's were very smooth
Randall Klein is offline   Reply With Quote
Old 05-30-2018, 03:09 PM   #9
Myron Piatek
VIP Member
 
Join Date: Nov 2001
Location: Florida
Posts: 1,494
Post Re: Real World Aerodynamics

Quote:
Originally Posted by Randall Klein View Post
FWIW
When Warren Johnson was racing the Cutlass he wrote an artice in ND about aero, if I recall correctly he said it didn't make much difference until tje very end at 200mph

Of course he was representing Oldsmobile (and the Cutlass)....those Cutlass's were very smooth
A few paragraphs down, Warren talks about how inferior the Firebird was compared to the Cutless it replaced......by 1.5 MPH!

http://www.hotrod.com/articles/drag-...hnson-profile/
__________________
LOCOMOTION Racing
Myron Piatek is offline   Reply With Quote
Old 05-30-2018, 03:09 PM   #10
nickh
Senior Member
 
nickh's Avatar
 
Join Date: Sep 2010
Location: Houston,Texas
Posts: 514
Default Re: Real World Aerodynamics

WJ also said a while back that the forward facing hoodscoops took away about 60 hp with the drag it created.
nickh is online now   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 06:32 PM.


Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Copyright © Class Racer.com. All Rights Reserved. Designated trademarks and brands are the property of their respective owners.Ad Management plugin by RedTyger