PaceThis

It's got almost 500rwhp, an AT, and 3.42 gears...what's the theoretical top speed?

Busa196

Dunno- but you're going to get 1,000 different answers as everyone seems to have their own calculation when figuring theoretical top speed

Demented

Well if you're in an auto it's 186 in 4th gear@6000 RPM if you tach it to 6500 rpm you can do 202. With a 6 spd in 5th gear you can do 188@6000 RPM and 203@6500 RPM. At 190 mph it takes 290 HP to the rear wheels to overcome wind resistance, at 200 it takes 340 hp at the rear wheels. This doesn't factor in rolling resistance, nor weight, only wind resistance. In 5th gear you put ~375 hp to the ground so you could possibly acheive the 202 mph mark if you had plenty of time to get there. All figures located on smokemup.com

Q8Y

hi there, here's a couple of fomulas hope it can help:

table #1

ne: which is engines rpm
pe: engines brake power (kw)
we: angulars velocity (1/s)
me: engines torque

pe=pe max [(ne/ne max)+(ne/ne max)^2 - (ne/ne max)^3 ]
pe max= maximum power ... ne max: rpm for that power

we=2bi ne / 60
for all rpms

me= (pe/we) * 1000

table #2:
then there's another story
note: do the same for all gears 1-6

ig*id= initial gear ratio * final drive gear ratio
nw= ne/(id*ig)
ww= 2bi nw/60
mw= me*mech trans efficiency*ig*id
fw= mw/rw
vc (km/h) = rw*ww*3.6

you can get rw with this formula:
rw=(d/2*25.7)+(a*b*0.9)/1000
ex.:
if u r using P285/35ZR-19 Goodyear Eagle F1 SC
then rw= (19/2 * 25.7)+(0.35*285*0.9) /1000 = 0.33

then draw this with FW in the vertical axis and VC in the horizontal axis.
then lets say you got a maximum Vc = 400 km/h
do this for the last table

tabl #3:
in the left
20km/h, 50 km/h, 100 km/h tell you get 450 km/h (more than the maximum vc u got)

then each speed (Vc in km/h) / 3.6 = m/sec right?

now bring Ra (air resistance) which = Ac*C*Vc^2
Vc in m/sec
Ac= Width of the car in meters * Height in meters * 0.79
C= drag coefficient

then bring Rolling resistance which = G * F
G=Weight (kg) * 9.8 (s gravity)
F is for the coefficient for the road.
Ex. asphalt and concret roads = 0.014 - 0.018 for the excellent conditions while 0.018 - 0.020 for satisfactory conditions
note: Rr is constant for all speeds

then bring Ra+Rr for all speeds

draw a curv for (Ra+Rr) with the same graph that u draw the gear curves, as you can see the rr+ra curve did contact with some gears.
the maximum vc with the contact point is your maximum theoretical speed.

ex1: conatct points where in 5th gear at 290 km/h, and ith the 6th at 330 km/h
then your top speed is 330 km/h

ex2: contact where in the 5th gear at 316 km/h, and 6th gear 294 km/h
then you top speed is 316 km/h in the 5th gear
you must use 3.7 gears or 3.9 gears rather than 3.1 gears

hope that helps,
ahmed


PS. i'm sorry PaceThis, i couldn't do it for u because i've final exams these days


[Modified by Q8Y, 12:59 AM 6/17/2004]


[Modified by Q8Y, 1:00 AM 6/17/2004]

CDH76

Q8Y

LOL
it's a real

Hool97

Pe We Weepy We We = u not me what??>?

:p:

devo

Ok you lost me right here?

"then draw this with FW in the vertical axis and VC in the horizontal axis.
then lets say you got a maximum Vc = 400 km/h
do this for the last table"

Ok you lost me back at the top but I thought I was keeping up!

mwagne16

Try this link:
http://home.nc.rr.com/jbolton/asim.html

Scubanme

I have a very easy method to calculate tp end speed. First
is to calibrate the speedometer and then drive at 3,000 RPM in 5th and check your speed should be about 95 at a guess. Just double the speed for 6,000 RPM which should be 190. This is just a guess. You need to go out and do this to find out.

3RD-INF

Take the darn car out and give her hell. Thats the only way you will ever know.

nuke61

1998 Lingenfelter Twin Turbo C5 top speed is 203.1 -- you will be less than that

Ooops... must have been an early version, or I just don't know what I was reading Yep, 230 or so MPH, but that's with 1100 hp.

I'll still say less than 203.1

oufan2929

Either Road & Track, or Car & Driver had the LPE TT vette up to 226mph.

MC TORCH RED

i went 165 in 3rd gear with a-4 at 5600rpms, it had a little more in it, it red lines with my cam at 6600rpms, you should hit 185 e z.

VETTEC5

EZ

You take (me) and put (me) in (UR) car and the answer will be in your face in 5 mins.



J/k

I did 188 in mine at 6000 rpms with 540RWHP M6!

More than that I run out of road and Baaallllllllsssss!!!!!!

corvettefrance

That what i did, went on an empty highway, and once at 170 (It is a good number in colorado we loose HP due higher elevation) I cross a cop on the frontage road. I'm glad he did not see me. Last time I speed on open road.
If you add some HP you have to use it do some road racing (on closed road) and you will see what your top speed can beThere is a good one in Nevada.

corvettefrance

I read somewhere that you need 450 RWHP on a C5 coupe to reach 200MPH