there are two primary considerations:

GEARING and AERO DRAG

Gearing

the (US) FD has a .719 fifth gear.
the (US-manual trans) FD has a 4.10 rear gear.
stock sized rear tires 225/50/16 25 inch diameter 835 revolutions per mile.

the factory carries the top speed at 159-161 depending where you get your info.

let's do 7000 RPM in fifth:

7000 * 1.3908 (the inverse of .719)= 9735/4.1= 2374 * .95 (5% tire slip) =
2256/835 (revs per mile) = 2.7016 * 60 (minutes in an hour) = 162 mph.

6000 = 139
8000 = 185
9000 = 208

with an auto trans 3.90 rear gear:

6000 = 146
7000 = 170
8000 = 194
9000 = 218


AERO

once you have the gears you need to deal w the main issue: AERO DRAG.

the formula to solve for hp required to run a particular speed is interesting. it is all frontal area and drag coefficient and the hp required goes up with the CUBE OF THE SPEED!

FD

Drag Coefficient (R1) .31
Frontal Area 19.26 sq feet

let's solve for the flywheel hp to run 162 mph.

the formula looks like this:

(.31 * 19.26 * 162^3)/146,600 = 173 hp
to this number (173) we add 5% transmission, 6% driveline and 60 hp to drive the tires.

total flywheel hp to drive an FD 162:

173 + 9 + 10 + 60 = 252 flywheel hp.

hp to drive the FD 180 is 315 flywheel

hp to drive the FD 200 is 410 flywheel

hp to drive the FD 225 is 558 flywheel

notice how cubing the speed is catching up with us.

from 180 to 225 is a 25% increase in speed.

the HP needed has gone up 77%.

i have run my car to 170 on the main straight (6000 ft) at Brainerd Int'l. at the time i ran no rear wing and the R1 splitter. it was rock solid. any FDs having a high speed problem need to look at setup. alignment, tire balance and aero.

i am quite intrigued at the standing start mile long events. if all works out this year i would like to do either the Texas Mile or the Maxston Mile. i would be wanting to run 200. there are some good Mile videos out there on the web.

anyone thinking about a top speed event out there?

drool.

howard coleman

 

I would love to attempt the 200mph marker. I have more than enough power. I think the real determining factor is having a safe place to do so. The street/highway has it's demon's and not to mention the heartless risk to the general public.

 

wow that was informative

 

I need to learn where you get all this math from. So much to learn.

 

But there's another thing to take into account that the local SRT-4 club informed me of... The FD has a limiter at 115mph

 

Thats because he drives a SRT.

 

Ah thats cute. Gotta love those guys

 

Wow.

 

Your Neon driving friend is slightly misinformed. The JAPANESE FDs have a speed limiter at 112mph. The AMERICAN FDs have no speed limiter.

That speed limiter is very easily defeated as well, snipping a wire or two, installing a Fuel Cut Defenser or installing a PowerFC.

 

Limited? .. either that or all our US FD's are broken.

 

Come out to the Texas Mile...I haven't heard much about it just know of two Vipers that have made it. I don't understand if it's a standing mile or not in which case getting to 200+ w/in a mile would be hard considering how fast the other 3/4 mile come at those speeds.

 

what neon site is this lol???

 

if you have stock 4.10 you will run out of gear at 201. if you go to 8000rpm.

 

^ummm no did not read howards post???