Re: Speed Application

["Matt Bullington" <typhoon@olynet.com>]

http://www.syty.org/calculator.html
that is all

tim kling
1999 audi TT

----------
> From: Chuck Simpson <csimpson@zeltech.com>
> To: jettaglx@igtc.com
> Subject: Re: Speed Application
> Date: Friday, October 16, 1998 6:28 AM
> 
> Okay,
> 
> Try this...
> 
> MPH = (RPM * TireDiameter) / (FinalDriveRatio * 336)
>     TireDiameter = 23.08"
>     FinalDriveRatio = 3.39
> 
> Some examples:
>     60.79 = (3000 * 23.08) / (3.39 * 336)
>     121.58 = (6000 * 23.08) / (3.39 * 336)
>     131.71 = (6500 * 23.08) / (3.39 * 336)
> 
> Sounds pretty close.  Got the formula off the net.
> 
> I really don't think Wind Drag has anything to do with calculating
> the MPH for a car.  It will affect acceleration.
> 
> c-ya,
> 
> Chuck Simpson
> '98 White Jetta GLX-VR6
> 
> 
> Adam Lindsay wrote:
> 
> > OKay....follow me here for a minute. I want to write an application
that
> > takes into account as many possible variables and calculates a
realative
> > distance, speed of a car run. Such an application could show prime
shift
> > points and speeds to expect at certain RPMs in certain Gears. I have
some
> > formulas now to get speed but I reliezied that Torque and Weight must
be a
> > contributing factor. Does anyone have these formulas laying around or
know
> > where I could get them.
> >
> > I know that there are some many factors that play into account that I
could
> > possible ever write an app that was perfect. The color of shirt affects
how
> > fast you can go. =} But I want to see how close I can get.
> >
> > This is what I have so far.
> >
> > MPH = (RPM * TireDiameter)/(Gear Ratio * 1000)
> > TireDiameter = ((Section Width * Aspect Ratio)/25.4) * 2 + RIM
> > Gear Ratio
> > 1    3.78
> > 2    2.12
> > 3    1.46
> > 4    1.03
> > 5    .84
> > R    3.80
> > F    3.39
> >
> > so sample
> > 205/50 R15 at 3000RPM in 3rd gear on a Jetta GLX
> >
> > TD = (205 * .50)/25.4 * 2 + 15
> > TD = 23.08"
> > MPH = (3000 * 23.08)/1.46 * 1000
> > MPH = 47.4
> > Real World showed pretty close results.
> >
> > But I want to study acceleration. So I need more formulas.
> 
>