This is a neat little calc. I haven't had the time to plug in the numbers yet so knock yourself out!


http://home.earthlink.net/~jonaa/topspeed.html

http://home.earthlink.net/~jonaa/LS1new.xls

6spd and base car= 3.27 axle
srt6= 3.07 axle
6th = .838 ratio
5th automatic srt6= .831

effective tire ratio is 25.7", add about 7psi for measuring at top speeds, mark tire at centerline on floor, rool car forward until the mark meets the centerline again, take distance and divide by 3.14.

the Cd= .37

frontal area = 20.56 sqft

all you have to do is enter in available hp at rpm, 215hp at 5200rpm for stock crossfire. srt6 is 330hp at 6100rpm.

 

Here is a less complicated formula that I learned from my father, I use it often. TRFP x DF + MHT = MV. This has been around for many years and has always produced the most exacting results for me. Give it a try and see if you like the results.








TRFP - Total Right Foot Pressure
DF - Distance to Floor
MHT - Maximum Hold Time
MV - Maximum Velocity

 

well for those that have a rev limiter or a speed limiter, that really doesn't work now does it.
Everyone keeps saying how the limited crossfire still has more power to keep on trucking once you hit 150mph and the ecu shuts down. And I've heard one guy on here claim 180mph in an srt6, though I'm not sure of his mods but at that speed air resistance is huge!

to hit 181mph you need 397hp in the srt6

to hit 160mph in the NA crossfire you need 270hp.

215hp will only propel us to 148mph

 

If you are computer limited then that is your top speed, regardless of HP or formula.

 

Well, I can say that's not our top speed from experience , but it's damn close to what I got via actually trying.

EDIT: I guess it's possible I had a tail wind, or a slight negative grade in the road helping me as well.....

 

I also have my doubts about it's acuracy it's probably withing +/-10mph, also the frontal area of the car may be the same as a blocky square nose car, the shape of the frontal area is a big factor. such as a flat front end like in 60's muscle cars vs the sleek aerodynamic shape of the crossfire's swooppy nose and windshield. there are many more factors you can add to his exel formula to make it much more acurate, but I think it's close enough.

 

Maxwell, I'd have to agree with much of what your saying. I also found it interesting at how close your calculations for top speeds of an SRT and a Limited were to another couple of similar cars that set some records back in 1968.
I'm referring to the records set by a 290, and a 390 AMX (what else?) driven by the team of Mr. & Mrs. Craig Breedlove.
Even though these cars were modified slightly, their individual H.P. ratings would probably come close to that of a "stock" SRT & NA Crossfire. Even more coincidental is the fact that the AMX has the very same frontal area as the Crossfire. But as you pointed out, not as aerodynamic. But don't take my word for it, read all about it:
http://www.amx-perience.com/arecord.htm

 

i hit 145 and the car still had plenty left in it? had to let off traffic was coming to fast.