408 mph in a Crossfire? YOU FIRST! LOL

 

It's not the 408 mph that I'm afraid of, it's the rapid decelleration at the end!

 

I also have had my xf to 150mph on the freeway in Salt Lake City, elevation here is 4000ft.

 

On I-15? You are braver than I!!!

 

yeah, But nobody else was on I-15 in that area at the time, I promise lol, it was like 3 in the morning

 

OK Tom212, would a 30mph tailwind give you a 30mph higher top speed, or would you get only a small reduction in drag as your chart earlier in this thread suggests, therefore only a slight increase in speed?
Another fun fact about a Crossfire at high speeds... Can you name at least 4 parts of the car that have zero forward speed, even at that elusive 200 mph?

 

OK, you guys now officially scare me

 

A 30 mph tailwind would ideally give you a 30mph top speed. I say ideally because anything other than a "rule of thumb" estimate in aerodynamics is a 3D euler field problem.

But sure, it would be accurate to say you get "about 30mph" more top speed. It would be even more accurate to say "it would take you about 30mph less worth of horsepower to get to the same speed" - a statement which allows you to ignore gearing.

 

The wheels have "rotational speed" on an axis. They do not use "forward speed," right?

 

THE CUPHOLDER!!

 

Something is tech enough that it scared HDDP.......I'm impressed!

 

I would suspect these 4 parts are gears somewhere in the drive line,
whose rotation is counter to the forward motion. But I don't know which
ones.

Coyote

 

Any part of the car that goes with it from point A to point B could be the answer. This is not a trick question, and the answer has some very important implications in the safety, performance, handling, noise level, etc. of your car. I love puzzles...

 

I'm praying it's the contact patches or they'll be big heap o'trouble.

The odd flip side (bad choice of words in a conversation about high speed driving, I know) is that to an observer in an outside frame of reference the tops of the tires would appear to be moving at 400 mph while the contact patch portion of the tire (hopefully) is standing still.

 

You would be right. This was one of the 'trick' question my HS ROTC instructor used to ask all of the time.

Tom,

I have a complete Excel spreadsheet with everything you are looking for, including rolling resistance of the tires. I was playing with this a few years ago when I was looking to get into the 175mph club at the Silver State Classic with a Spirit R/T.

 

lol, I have done 157 in my xfire,on old fort irwin road,and th 15

 

now we know why you have tom 2112 we know it is only 2009 but you are in 2112 lol. jim

 

Wow, I wish I had seen this sooner, so I could have said it is all wrong just that much quicker.
I guess that my top speeds that I have reached in both my Limited @ 157 and my modified SRT @ 174 are both my imagination.
I studied physics and while I agree with your formula you must realize that any number that is off by even the smallest amount rolls over into answers that can be miles off. First of all where did you get your h/p numbers?
I am hoping for 190mph this season, want to go for a ride...?

 

Well you could have explained it much simpler for us common folk by using the formula E=mc2. What were you thinking!

 

I thought this thread was dead and buried. Yes, it's the contact patches of the tires. The fact ocurred to me one day while watching a video of a half-track vehicle moving at a good clip. It was quite obvious that the part of the track planted on the ground had zero forward speed while the rest of the track was racing forward at twice the speed (of the vehicle) to take its place.

Congrats to Display_name for coming up with the answer!