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Hey, Dick
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Dick- I accidentally deleted your time/speed chart. Can you re-send it =
to me?
Larry
----- Original Message -----=20
From: Rabbit16v=20
To: Scirocco List=20
Sent: Saturday, December 14, 2002 12:00 PM
Subject: Re: speedo accuracy
Your only fault in all of this is that you haven't had it radar =
checked.
I'll bet if you did have it checked with radar that it would be off =
just
like everyone else's. I guess the problem that we need to figure out =
is
where our calculations are going wrong. At this point I think we need =
to
question the charts we have access to on the internet? Anyone have a =
chart
on paper in a manual or something that they can compare to the charts =
on
Scirocco.org?
Dave
>
> My $.02 CDN on the speedo issue (along the same lines as Ron's) =
Both the
> Scirocco and the winter-beater Jetta have 7A transmissions in them. =
The
> Scirocco has the stock 220KM/h speedo, and the tach is a W-field
> alternator driven unit from an 89 Jetta TD (ranging from 0-5000rpm) =
The
> Jetta has a 16V speedo (260km/h) and tach (0-8000rpm) The speedo =
drive
> gear matches the R&P of the transaxle (3.94 in the 7A)
>
> These two cars read as dead on as I can reckon by eye for RPM vs.
> indicated speed on the speedometer - ie. 100KM on the clock is 2575 =
rpm on
> both tachs (admittedly harder to pinpoint on the 8K tach due to =
scale...)
> which impresses me, especially as the Scirocco's tach runs from the =
pulses
> on the alternator, not the ignition, which means it's more prone to =
error
> (belt slip, different pulley diameters etc)
>
> I know that the Scirocco's actually speed will be off very slightly
> (compared to the indicated speed) because it has 185/60R14, which =
results
> in a slight increase in travelled speed (the rpm difference at =
100km/h is
> less than 50 though)
>
> Personally I'm impressed by the consistency of VW's speedos, even if =
they
> are optomistic (which I have not had occasion to determine.) The =
fact
> that these two cars with different tachs and speedos come up with =
the same
> readings as can be calculated from gear ratio and tire diameter is =
cool.
>
> Drew
>
>
>
>
>
> _______________________________________________
> Scirocco-l mailing list
> Scirocco-l@scirocco.org
> http://neubayern.net/mailman/listinfo/scirocco-l
_______________________________________________
Scirocco-l mailing list
Scirocco-l@scirocco.org
http://neubayern.net/mailman/listinfo/scirocco-l
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<DIV><FONT face=3DArial size=3D2>Dick- I accidentally deleted your =
time/speed=20
chart. Can you re-send it to me?</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>Larry</FONT></DIV>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: #000000 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: =
0px; PADDING-LEFT: 5px; PADDING-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV=20
style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
<A href=3D"mailto:Rabbit16v@attbi.com"; =
title=3DRabbit16v@attbi.com>Rabbit16v</A>=20
</DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A=20
href=3D"mailto:scirocco-l@scirocco.org"; =
title=3Dscirocco-l@scirocco.org>Scirocco=20
List</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Saturday, December 14, =
2002 12:00=20
PM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Re: speedo =
accuracy</DIV>
<DIV><BR></DIV>Your only fault in all of this is that you haven't had =
it radar=20
checked.<BR>I'll bet if you did have it checked with radar that it =
would be=20
off just<BR>like everyone else's. I guess the problem that we =
need to=20
figure out is<BR>where our calculations are going wrong. At this =
point I=20
think we need to<BR>question the charts we have access to on the=20
internet? Anyone have a chart<BR>on paper in a manual or =
something that=20
they can compare to the charts=20
on<BR>Scirocco.org?<BR><BR>Dave<BR><BR>><BR>> My $.02 CDN on the =
speedo=20
issue (along the same lines as Ron's) Both the<BR>> Scirocco =
and the=20
winter-beater Jetta have 7A transmissions in them. The<BR>> =
Scirocco=20
has the stock 220KM/h speedo, and the tach is a W-field<BR>> =
alternator=20
driven unit from an 89 Jetta TD (ranging from 0-5000rpm) =
The<BR>>=20
Jetta has a 16V speedo (260km/h) and tach (0-8000rpm) The speedo =
drive<BR>> gear matches the R&P of the transaxle (3.94 in the=20
7A)<BR>><BR>> These two cars read as dead on as I can reckon by =
eye for=20
RPM vs.<BR>> indicated speed on the speedometer - ie. 100KM on the =
clock is=20
2575 rpm on<BR>> both tachs (admittedly harder to pinpoint on the =
8K tach=20
due to scale...)<BR>> which impresses me, especially as the =
Scirocco's tach=20
runs from the pulses<BR>> on the alternator, not the ignition, =
which means=20
it's more prone to error<BR>> (belt slip, different pulley =
diameters=20
etc)<BR>><BR>> I know that the Scirocco's actually speed will be =
off=20
very slightly<BR>> (compared to the indicated speed) because it has =
185/60R14, which results<BR>> in a slight increase in travelled =
speed (the=20
rpm difference at 100km/h is<BR>> less than 50 =
though)<BR>><BR>>=20
Personally I'm impressed by the consistency of VW's speedos, even if=20
they<BR>> are optomistic (which I have not had occasion to=20
determine.) The fact<BR>> that these two cars with different =
tachs=20
and speedos come up with the same<BR>> readings as can be =
calculated from=20
gear ratio and tire diameter is cool.<BR>><BR>>=20
Drew<BR>><BR>><BR>><BR>><BR>><BR>>=20
_______________________________________________<BR>> Scirocco-l =
mailing=20
list<BR>> <A=20
=
href=3D"mailto:Scirocco-l@scirocco.org";>Scirocco-l@scirocco.org</A><BR>&g=
t; <A=20
=
href=3D"http://neubayern.net/mailman/listinfo/scirocco-l";>http://neubayer=
n.net/mailman/listinfo/scirocco-l</A><BR><BR><BR>________________________=
_______________________<BR>Scirocco-l=20
mailing list<BR><A=20
=
href=3D"mailto:Scirocco-l@scirocco.org";>Scirocco-l@scirocco.org</A><BR><A=
=20
=
href=3D"http://neubayern.net/mailman/listinfo/scirocco-l";>http://neubayer=
n.net/mailman/listinfo/scirocco-l</A><BR></BLOCKQUOTE></BODY></HTML>
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