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

Nice dream!
Puuuuuleeasse stop!!!!!!!!
Get your instruments (tach and speedo) calibrated.
Guys with 16V's making 120-130 whp are getting 130MPH.
Did you read the part about power being proportional to V^3??
To go 10% faster you need 33% more power. You don't have 33% more power than anything but a stock
1.8 JH. That ought to get you ~120 if you're lucky.
One more thing. If you're actually attaining 6600 RPM at your top speed then you're way past your
power peak and you don't have 102 cause your power is dropping off rapidly. Just look at your dyno
runs.
Hate to be pissy, but wake up.
Dan
just tired of some of the ridiculous claims!

----- Original Message -----
From: "Patrick Bureau" <ats@longcoeur.com>
To: "'Marc_Scirocco_Qu?bec'" <marc_scirocco@sympatico.ca>; "'scirocco'" <scirocco-l@scirocco.org>
Sent: Monday, March 08, 2004 7:40 PM
Subject: 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/Physics/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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> > >
> > >
> > >
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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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