BB Chev HP

Kevin Panzino · 05-11-2020, 11:03 AM

Quote:

Originally Posted by Stan Weiss

Thanks. That 143 MPH had me going. I still don't think that I have the areo dynamic drag right. If you have the time slip how close is this?

60 Foot ET = 1.2200
330 Foot ET = 3.5988
1/8 Mile ET = 5.6781
1/8 Mile MPH = 117.6483
1000 Foot ET = 7.4905
1/4 Mile ET = 9.0332
1/4 Mile MPH = 146.1391

Stan

Stan, be careful trying to back into aero coefficients with data from Cecil County. That track is downhill, Literally, down hill quite a fair amount. Most people run a solid 2 MPH faster there.

Glenn Briglio · 05-11-2020, 12:14 PM

Quote:

Originally Posted by Kevin Panzino

Stan, be careful trying to back into aero coefficients with data from Cecil County. That track is downhill, Literally, down hill quite a fair amount. Most people run a solid 2 MPH faster there.

And the roll out is huge!

Stan Weiss · 05-11-2020, 12:25 PM

Kevin / Glenn
Thanks. I can adjust the roll. But before this I have never changed it from the default 11.75" The low MPH reminds me of when I did a simulator of a Pro Stock Motorcycle some years ago. I said to the owner that the only way I could get the et to lineup with the MPH was to run out of RPM before the finish line. He laughed and said me too.

Stan

Adger Smith · 05-11-2020, 08:48 PM

Wow, just got on Google earth and the starting line is 336 Ft. and the finish line is 320 Ft. Yep, that is downhill. a lot of trees around there, too. Probably O2 rich at sometime of the year.

Stan Weiss · 05-12-2020, 12:27 PM

Quote:

Originally Posted by Adger Smith

Wow, just got on Google earth and the starting line is 336 Ft. and the finish line is 320 Ft. Yep, that is downhill. a lot of trees around there, too. Probably O2 rich at sometime of the year.

Adger,
Thanks for those numbers. I have never used Google earth. Could you check Capitol Raceway in Maryland. Just by looking down the track it seemed to me to be more down hill than Cecil.

Stan

Bob Mulry · 05-12-2020, 03:34 PM

Quote:

Originally Posted by Kevin Panzino

Stan, be careful trying to back into aero coefficients with data from Cecil County. That track is downhill, Literally, down hill quite a fair amount. Most people run a solid 2 MPH faster there.

It's less than 1% (13.2') downhill or it would be a factored track...

There are a lot of downhill tracks without factors

Just sayin'

05-11-2020, 12:25 PM	#3
Stan Weiss Senior Member Join Date: Apr 2020 Location: Phila, PA Posts: 795 Likes: 0 Liked 734 Times in 385 Posts	Re: BB Chev HP Kevin / Glenn Thanks. I can adjust the roll. But before this I have never changed it from the default 11.75" The low MPH reminds me of when I did a simulator of a Pro Stock Motorcycle some years ago. I said to the owner that the only way I could get the et to lineup with the MPH was to run out of RPM before the finish line. He laughed and said me too. Stan

05-11-2020, 08:48 PM	#4
Adger Smith VIP Member Join Date: Dec 2001 Location: Texarkana Ark/TX Posts: 2,446 Likes: 575 Liked 880 Times in 311 Posts	Re: BB Chev HP Wow, just got on Google earth and the starting line is 336 Ft. and the finish line is 320 Ft. Yep, that is downhill. a lot of trees around there, too. Probably O2 rich at sometime of the year. __________________ Adger Smith (Former SS)