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What's the fastest can ever take your Scirocco? - more numbers



It is actually more an aproximation.

You have a Kamei kit. Cd gets a bit lower with it, whatever the number might
be. Play with the formula with your measured WHP, and estimated speed, and
you might get closer to your actual Cd.

Then you can take into the measurement the speedo error.

It gives you an idea.

Now you can plug the front gril with an aluminium plate. Get some duct tape
around the headlight, and hood/fender seams, and where there is any gap on
the frontal area, and your top speed will raise a bit.

Cheers.

Marc
'83 Scirocco
'97 A4

> -----Message d'origine-----
> De : Patrick Bureau [mailto:ats@longcoeur.com]
> Envoy? : lundi 8 mars 2004 19:41
> ? : 'Marc_Scirocco_Qu?bec'; 'scirocco'
> Objet : RE: What's the fastest can ever take your Scirocco? - more
> numbers
>
>
> Marc,
>
> It works but I have 102.5 WHP and I can do over 130MPH :)
>
> ---
> ATS - Patrick Bureau -  Web site :
> http://ats.longcoeur.com]http://ats.longcoeur.com
> AIM: texasscirocco - Yahoo: atsgtx - ICQ: 32918816 - MSN:
> atsgtx@hotmail.com
> See what I am selling today on eBay: http://tinyurl.com/22e5b
>
>
> -----Original Message-----
> From: scirocco-l-bounces@scirocco.org
> [mailto:scirocco-l-bounces@scirocco.org] On Behalf Of Marc_Scirocco_Qu?bec
> Sent: Monday, March 08, 2004 4:56 PM
> To: 'scirocco'
> Subject: RE: What's the fastest can ever take your Scirocco? -
> more numbers
>
> Here are some more numbers:
> Don's kid's finding:
> <<http://www.perry-lake.k12.oh.us/phs/Classdept/ScienceDept/Physic
> s/ClassTop
> ics/friction/car_topspeed.html>>
> F = (0025) x Cd x A x V^2
> P = (.0027) x F x V
>
> <<http://elf.sqush.net/car2.html>>
> MKII Scirocco has an advertised Cd of 0.38 A = 18.3 square foot =
> 1.7001256
> square meter = 1.7
>
> <<http://www.performancetrends.com/PDFs/DRAMan4.pdf>>
> page 33 "For a realistic Cd, add .03 to .05 to the advertised Cd."
> Cd = 0.38 + 0.04
>
>
> You mix both formulas (F and P):
> P = (.0027) x ( (.0025) x Cd x A x V^2 ) x V
>
> P = 0.00000675 x Cd x A x V^3
>
> You plug in the numbers:
> P = 0.00000675 x 0.42 x 18.3 x V^3
>
> P = 0.00000675 * 7.686 * V^3
>
> P = 0.0000518805 * V^3 where 0.0000518805 = ( 1 / 18275 )
>
> P = V^3 / 18275
>
> So for a speed of 124 MPH, you need:
>
> P = 104.33 (Wheel HP)
>
> Does it make sense?
>
> Cheers.
>
> Marc
> '83 Scirocco
> '97 A4
>
> > -----Message d'origine-----
> > De : Don Walter [mailto:dswalterwi@earthlink.net] Envoy? : lundi 8
> > mars 2004 17:33 ? : Marc_Scirocco_Qu?bec; Dan Bubb; Patrick Bureau;
> > 'Drew MacPherson'; 'reptilis'
> > Cc : 'scirocco'
> > Objet : What's the fastest can ever take your Scirocco?
> >
> >
> > I gave my 14 year old son the task of finding how to comute this and
> > darned if he didn't find this for you:
> >
> > <http://www.perry-lake.k12.oh.us/phs/Classdept/ScienceDept/Physics
> > /ClassTopics/friction/car_topspeed.html>
> >
> > It is an excellent web site on the topic.
> >
> > Don
> >
> >
> > -----Original Message-----
> > From: Marc_Scirocco_Qu?bec <marc_scirocco@sympatico.ca>
> > Sent: Mar 7, 2004 9:09 AM
> > To: Dan Bubb <jdbubb@ix.netcom.com>, Patrick Bureau <ats@longcoeur.com>,
> > 	'Drew MacPherson' <drew@scirocco.cs.uoguelph.ca>,
> > 	'reptilis' <reptileis@comcast.net>
> > Cc: 'scirocco' <scirocco-l@scirocco.org>
> > Subject: RE: what's the fastest you've ever taken your Scirocco?
> >
> > The specs for a MKII 8V are a cd of 0.38, and a frontal area of
> > 18.3 square
> > feet.
> >
> > Anybody knows the math to compute how much hp are needed to pull a
> > Scirocco at, say 120 MPH?
> >
> > Cheers.
> >
> > Marc
> > '83 Scirocco
> > '97 A4
> >
> > > -----Message d'origine-----
> > > De : scirocco-l-bounces@scirocco.org
> > > [mailto:scirocco-l-bounces@scirocco.org]De la part de Dan Bubb
> > > Envoy? : dimanche 7 mars 2004 11:56 ? : Patrick Bureau; 'Drew
> > > MacPherson'; 'reptilis'
> > > Cc : 'scirocco'
> > > Objet : Re: what's the fastest you've ever taken your Scirocco?
> > >
> > >
> > > I thought you had a 4K gearbox??
> > > That would have a 3.94 final drive and 6600 RPM would net 129MPH.
> > >
> > >
> > > ----- Original Message -----
> > > From: "Patrick Bureau" <ats@longcoeur.com>
> > > To: "'Drew MacPherson'" <drew@scirocco.cs.uoguelph.ca>; "'reptilis'"
> > > <reptileis@comcast.net>
> > > Cc: "'scirocco'" <scirocco-l@scirocco.org>
> > > Sent: Sunday, March 07, 2004 9:31 AM
> > > Subject: RE: what's the fastest you've ever taken your Scirocco?
> > >
> > >
> > > > Humm glad the system is back out,
> > > >
> > > > Tested my numbers...against the computer gear thing.
> > > > Rememebr I recalled it sbeing 240KPH/150MPH @ 6600 RPM, well
> > > seems that WAS
> > > > a high guess.
> > > >
> > > > 205-50-15, 3.67 FD, .89 5th gear @ 6600 RPM = 138 MPH/223 KPH But
> > > > at 7000 RPM I would be going 148MPH (my next goal)
> > > >
> > > > Do the digifiz is off by 10MPH over 130MPH... Ah who would of
> > > guessed it!
> > > >
> > > > Note the same specs (205-50-15, 3.65FD, @ 6600RPM  but .75 5th
> > > = 165 MPH..
> > > > Hummm I do have that FN laying around on the 82.. MUAHAHAH
> > > >
> > > > ---
> > > > ATS - Patrick Bureau -  Web site :
> > > > http://ats.longcoeur.com]http://ats.longcoeur.com
> > > > AIM: texasscirocco - Yahoo: atsgtx - ICQ: 32918816 - MSN:
> > > atsgtx@hotmail.com
> > > > See what I am selling today on eBay: http://tinyurl.com/22e5b
> > > >
> > > >
> > > > -----Original Message-----
> > > > From: scirocco-l-bounces@scirocco.org
> > > > [mailto:scirocco-l-bounces@scirocco.org] On Behalf Of Drew
> > > > MacPherson
> > > > Sent: Sunday, March 07, 2004 7:36 AM
> > > > To: reptilis
> > > > Cc: scirocco
> > > > Subject: Re: what's the fastest you've ever taken your Scirocco?
> > > >
> > > >
> > > > Perhaps not a new speedo, but a new guesstimator is in order... :)
> > > >
> > > > FYI  A stock 4K is doing 108 mph on 175/70R13.  Even if you had
> > > a 16" tire
> > > > with a 25" rolling diameter you'd only be doing 119mph at 5700
> > > > rpm.  A
> > > > 215/40R16 has a rolling diameter of about 23.6"
> > > >
> > > > Check out www.scirocco.org/gears for assistance in calculating
> > > speeds with
> > > > given gear ratios/tire sizes.
> > > >
> > > > Drew
> > > >
> > > >
> > > > On Sat, 6 Mar 2004, reptilis wrote:
> > > >
> > > > > Since the mods, and pushing about 180 crank HP with a 4K
> tranny, 16"
> > > > > wheels, and all new suspension and steering components:
> > > > > Ive had the needle of the speedo buried so deeply that it
> > took longer
> > > > > for it to come back to the point of registering 85mph than
> > it does to
> > > > > come come down from 85MPH to zero. In 5th gear, the car
> was at about
> > > > > 5700 rpm and still had power to continue acceleration.   I would
> > > > > guesstimate that i was doing 150-160 easily.      On  a
> > nice straight
> > > > > stretch of I-5.
> > > > >
> > > > > I really need a new speedo.
> > > > >
> > > > >
> > > > > _______________________________________________
> > > > > Scirocco-l mailing list
> > > > > Scirocco-l@scirocco.org
> > > > > http://neubayern.net/mailman/listinfo/scirocco-l
> > > > >
> > > >
> > > > --
> > > > ============================================
> > > > 84 Wolfsburg Edition TurboDiesel Scirocco
> > > > http://scirocco.cs.uoguelph.ca/gtd
> > > > 89 Audi 200 Turbo Quattro Avant
> > > > 99 A3 Jetta TDI
> > > > ============================================
> > > >
> > > >
> > > > _______________________________________________
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> > > > Scirocco-l@scirocco.org
> > > > http://neubayern.net/mailman/listinfo/scirocco-l
> > > >
> > > >
> > > >
> > > >
> > > > _______________________________________________
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> > >
> > >
> > > _______________________________________________
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> >
> >
> > Don Walter - Waukesha, WI
> > 1984 1.8 8V Pewter Scirocco (sold years ago)
> > 1986 2L 16V Toronado Red Scirocco (under repair)
> > 1988 1.8 16V Toronado Red Scirocco (for sale)
> > 1986 1.8 16V Black Scirocco (my new ride)
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