Head wind vs tail wind-ET impact

Tony Curcio · 09-11-2012, 07:40 PM

The Jegs log book said that 8 mph wind = .05 ET, using a 9.90 car as an example.
It doesn't address differences in frontal area.

My experience with a Camaro running a little slower than yours matched the Jegs formula pretty well for a head wind, but is affected a bit less by a tail wind.

cad · 09-11-2012, 07:57 PM

Thanks guys. I appreciate it!

Tom Meyer · 09-12-2012, 08:55 AM

My Chevy II at topeka with a wind change you are talking about was anywhere from 15 20.That place is a dailing nitemare with the wind go luck. Tom

cad · 09-12-2012, 09:21 AM

Thursday looks like rain and Friday looks beautiful, so we'll get the gambler in.
We get 1 time trial Saturday and straight into Race of Champions, so at least we get 1 shot.

gsa612 · 09-12-2012, 12:26 PM

Quote:

Originally Posted by Tom Meyer

My Chevy II at topeka with a wind change you are talking about was anywhere from 15 20.That place is a dailing nitemare with the wind go luck. Tom

X2, the layout of the track at topeka makes it like a wind tunnel if you got a headwind, lost 2 tenths when the wind picked up, the da only changed a couple hundred ft. gsa612

09-11-2012, 07:40 PM	#1
Tony Curcio Member Join Date: Mar 2002 Location: West Chester, PA Posts: 271 Likes: 1 Liked 4 Times in 1 Post	Re: Head wind vs tail wind-ET impact The Jegs log book said that 8 mph wind = .05 ET, using a 9.90 car as an example. It doesn't address differences in frontal area. My experience with a Camaro running a little slower than yours matched the Jegs formula pretty well for a head wind, but is affected a bit less by a tail wind. __________________ Tony Curcio 1860 STK

09-11-2012, 07:57 PM	#2
cad Senior Member Join Date: Apr 2009 Location: Omaha, NE Posts: 702 Likes: 202 Liked 91 Times in 51 Posts	Re: Head wind vs tail wind-ET impact Thanks guys. I appreciate it!

09-12-2012, 08:55 AM	#3
Tom Meyer Senior Member Join Date: Aug 2003 Location: Pierce NE Posts: 936 Likes: 78 Liked 354 Times in 120 Posts	Re: Head wind vs tail wind-ET impact My Chevy II at topeka with a wind change you are talking about was anywhere from 15 20.That place is a dailing nitemare with the wind go luck. Tom __________________ Tom Meyer 5240 SS Stock ???

09-12-2012, 09:21 AM	#4
cad Senior Member Join Date: Apr 2009 Location: Omaha, NE Posts: 702 Likes: 202 Liked 91 Times in 51 Posts	Re: Head wind vs tail wind-ET impact Thursday looks like rain and Friday looks beautiful, so we'll get the gambler in. We get 1 time trial Saturday and straight into Race of Champions, so at least we get 1 shot.