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Re: Why only 115mph as top speed in 16V?
Jason,
In an FN it is! He has an FN transmission. 3.89 final drive, .91 *4th* gear.
Especially since he has 195/65R-14 tires (I'm actually off because of this, I
didn't know he had such big tires).
(195 x .65)=126.75mm or 4.94in. (sidewall height) x 2 = 9.88 in + 14 inches
(wheel diameter) = 23.88 inches (tire diameter). All this x3.14159 = 75.0211
inches (tire circumference).
(6500rpm / .91) / 3.89 = 1836.21 revolutions of the tire per minute x 75.0211
= 137754.4940 inches per minute. Divide by twelve for feet per minute =
11479.5411 ft/min. Divided by 5280 for miles per minute = 2.1741 mpm x 60 for
miles per hour = 130.4493mph @ 6500rpm in 4th gear with an FN trans and those big
tires.
-Josiah
16v Jason wrote:
> At 08:32 PM 5/12/99 , Rich Zuk wrote:
> >I did not drop into 4th. I was just cruuuuiiiiiising along in 5th. :)
>
> Good thing you didn't, Rich... redline in 4th is somewhere around 110...
> don't know where Josiah got those calculations from... but 6500 in 4th is
> most certainly _not_ 124mph! (Sorry Josiah! That would be like 8000rpm!)
>
> The reason you topped out at 115 is because you have a longer 5th gear than
> stock... Your 0.71 gear is 25% or so longer than the 0.91 stock 5th gear.
> Because of that, the stock gear multiplies the engine's torque by 25% more
> than yours does. Ergo, a lower top speed.
>
> Jason
>
> >
> >Peace
> >rich Z
> >
> >
> >
> >
> >> Well, according to that neato thingy you sent the list, 4400rpm in an FN
> >in 5th
> >> gear makes 107mph, so your tach or your speedo is off a little. Maybe your
> >car
> >> just isn't running right, though. Did you try dropping it into 4th? You
> >MIGHT
> >> get more speed that way (6500rpm = 124mph, the usual top speed of 16v's)
> >> -Josiah
> >> '84 GTI
> >> '87 QSW
> >> http://bork.hampshire.edu
> >>
> >> Rich Zuk wrote:
> >>
> >> > Is it the gear ratios?? Perhaps I have the wrong speedo cable??
> >> >
> >> > > shit i had my rabbit up to 126 with a 4 K figure that one out
> >> > > jonas
> >> > > damn i wish i had a car that runs
> >> > >
> >> > > Night Shadow wrote:
> >> > > >
> >> > > > Gots to be your tranny, I have had my rocco (1.8 8v Mk1) up to 122
> >> > before,
> >> > > > I'm running a 2H tranny
> >> > > >
> >> > > > Eric
> >> > > >
> >> > > > On Wed, 12 May 1999, Rich Zuk wrote:
> >> > > >
> >> > > > > 88 16V with FN tranny, final drive is 3.89 and 5th gear is .71
> >> > > > > drving to and from Cincy, I topped out at full throttle at 115mph,
> >> > ~4400 rpms.
> >> > > > > WHY so little?!! (Good thing I had Valentine)
> >> > > > >
> >> > > > > Peace
> >> > > > > Rich Z
> >> > > > >
> >> > > >
> >> > > > --
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> ----------
> 1987 Scirocco 16v
> 1989 Mercedes 190E Sportline Euro
>
> http://members.aol.com/rocco16v
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