The 200 Mph Club


:shrug
tpraceman said:
Mph = (rpm x tire diameter) divided by (Gear ratio x 336)

Final Drive Ratio 3.36:1 (stock rear tire diameter 28.9")

Add % for gear ratio (ie:6th would be + 37%)

Type 6-speed manual
Gear Ratios

1 - 2.61
2 - 1.71
3 - 1.23
4 - 0.94
5 - 0.77
6 - 0.63


If my goofy math is correct in 6th gear:
4000 RPM = 140.28
5000 RPM = 175.35
6000 RPM = 210.42
6500 RPM = 227.95
Click to expand...



Obviously, you're just saying that mathmatically those speeds could be reached in 6th.
But, if I remember correctly, "real world", weren't the 212 speeds reached at Nardo (or wherever it was) achieved in 5th due to hp/torque/rpm/drag limits being an issue in 6th ... or am I all wet on that one?:shrug
 
Per the driver at Nardo you can only reach the top speed in 5th gear because the push on the car in 6th just doesn't have enough UMPH to move it fast enough.

Matt
 
tpraceman said:
Fast Freedy,

According to my calculations and if your tires never grew your speedo is correct 204.66 @ 6,500 in 5th gear:banana now I know you might have been a little under, but I can assure you the tires grew a pinch which would more than make up for it and added 1 to 2 mph.

GPS error is more than you might think. If one is in the business they are super accurate. If one is using it might be well ....not so accurate.

http://adsabs.harvard.edu/abs/2005JApSc...5.1518A

In either case its a great tool and anyone who bangs the 200MPH deserves a special forum spot.:cheers
Click to expand...

my gps is very accurate as it tracks up to 11 satellites. as far as the rpm's go i was nowhere near 6,500 rpm's in 5th gear. last time i checked i was closing in on 6,000 rpm's. according to my calculations 6,500 rpm's would be 217 mph in 5th gear according to the speedo which would put the true GPS speed at 213 mph.

i am gonna ditch my muffler in favor of an x-pipe and turn up the the boost on my stock supercharger to 16 psi and retune the computer. i will also get that device that keeps your stock air intake bridge from collapsing. i am not sure what my car dyno's stock as i have yet to do that; but with these mods it should bring on another 100 rwhp. i am confident that this will allow me to hit 213 mph on GPS in 5th gear.

fyi, according to my calculations if you have enough power to pull 6th gear you will go 270 mph at 6,500 rpm's according to the factory speedo. so this should be about 263 mph on GPS.
 
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everetto said:
Thanks for clarifying the speedo readings. I hoped they were not that far off. Awesome run by the way! Indeed, 204 at 200 is really good, which means that my "almost 200" at 7000 feet altitude (not stock HP) was fairly close. This brings up an interesting question that I have been analyzing for some time - yes, HP is down at altitude, but DRAG is also less, so what is the net impact on high speed runs at altitude. My testing will continue.... I know my non-stock car had a bunch left...
Click to expand...


i would think in your case that the air density as it relates to your engines power output would have more of an effect on your top speed than aerodynamic drag at 7,000 feet above sea level as aposed to 0 sea level. i see that you have a whipple supercharger. :biggrin i am not sure how much boost you are running but that supercharger can make alot of power. take your car down to where i throw down at and you will have no problem maxing out 5th gear. in fact depending on how much rwhp you have you should be able to pull 6th gear a lil ways at sea level.
 
You are correct, redline in 5th is 217mph. 259 shows up as the dead end for 6th, though your tires would probably blow up if you got there, and you'd need an enormous Joe-like amount of power to get there. I think the tires were tested on rollers up to 226, but I wouldn't want to sustain anywhere north of 220 for more than a few seconds.

I'll dig out the Nardo DVD and try and rip it to the net...

3.jpg



p.s, if you wanted to get crazy, you could spin the motor up to about 7300rpm, but it would severely reduce your engine life.
 
P.P.S, Freddy, you will easily hit 213 with the pulley/tune (at least in neutral conditions). Though not verified by GPS, with a pulley and tune you can peg the speedo over 220mph...
 
DBK said:
P.P.S, Freddy, you will easily hit 213 with the pulley/tune (at least in neutral conditions). Though not verified by GPS, with a pulley and tune you can peg the speedo over 220mph...
Click to expand...

Speedo >220mph...so Dave are you saying that with a pulley and tune you get max speed in sixth gear instead of fifth?
 
I think Dave meant in 5th. Maybe the rev limiter would have to be increased. I don't think you can pull 220 in 6th without a TT, or Whipple on big boost.
 
Florida Chris said:
Speedo >220mph...so Dave are you saying that with a pulley and tune you get max speed in sixth gear instead of fifth?
Click to expand...

With most tunes the rpm limiter is increased to 6800-7000rpm. The speedo will read high anyways so you're probably actually only going 215-217. I'm not sure, but I don't think a pulley/tune is enough to pull that kind of speed in 6th. Somebody with bigger balls than me will have to test it, but I'd bet nothing short of a high-powered Whipple would do it.
 
hopefully a plantiff's atty will never find these threads in the event any of the posters are involved in defense litigation.
 
A Whipple car pushing 19 lbs boost will do 190 from a standing start to one mile. This is an electronically measured speed and is actually about 5 or 6 mph below what the speedo is reading. The car is still pulling like a freight train and obviously would do much more with several miles to achieve top speed instead of just one.

If you were doing 190 at one mile, how fast could you go after 4 miles? Too fast for me!
 
http://www.youtube.com/watch?v=BldmFelOOnE here the one I am driving with my friend car 320km then 300km.
 
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http://www.youtube.com/watch?v=YrnYEmrc_3Q there the one my brother driving in the same road with the Nissan Skyline GTR R34
 
 
 
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