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It=E2=80=99s important to remember that cars without overdrive had a higher a=
xle ratio than those with it. As an example, the GT6+ had a 3.27 final drive=
for non overdrive and 3.89 for overdrive. Just to complicate things, it was=
entirely possible to order a 3.27 diff with overdrive on top! The factory n=
ever promoted this facility for fairly obvious reasons. My own GT6 mk 2 was s=
upplied like that becxause I knew my way around the factory build books. Iit=
made an excellent cruiser with good fuel consumption but could not pull mor=
e than 4000 rpm, even downhill on a motorway. That said, refuelling was a li=
ttle less frequent.
Jonmac
At the Battle of Waterloo, 1815:
Lord Uxbridge: =E2=80=9CBy God, Sir - I=E2=80=99ve lost my leg=E2=80=9D
Duke of Wellington: =E2=80=9CBy God, Sir - so you have!=E2=80=9D
> On 1 Jun 2020, at 19:41, Dave MacKay <dave@mdmackay.ca> wrote:
>=20
> >Date: Sun, 31 May 2020 16:52:23 -0500
> >From: bill beecher <notakitcar@yahoo.com>
> >Subject: [TR] RPM speed calc
> >=20
> >Came across this calculator with all the right input fields. But, I wond=
er how accurate it really is given the following input.
> >TR3 with a 3.7 rear, OD at redline of 5,000rpm. Vredestein 165R/15 tires=
, 25.4? diameter. Should be moving along at 124mph!
> >=20
> >https://wahiduddin.net/calc/calc_speed_rpm.htm
> >=20
> >Anyone get a different answer?
> >Bill
> =20
> Here (attached) is a spreadsheet that I wrote to calculate speed versus rp=
m given different parameters. I wrote it to check my speedo after I installe=
d an HVDA transmission. If the spreadsheet doesn=E2=80=99t make it through t=
he list as an attachment, just e-mail me directly and I=E2=80=99ll send it t=
o you.
> =20
> With a standard Triumph gearbox + overdrive, and the parameters you gave, I=
calculate speed at 5000 rpm in top gear (with overdrive) as being 124.5 mph=
. Note that, I think that the tire diameter is 25.25=E2=80=9D, slightly less=
than you indicated.
> =20
> I hasten to add that calculating a speed and believing it=E2=80=99s achiev=
able are two different things!
> =20
> Regards,
> =20
> Dave MacKay
> 1960 TR3A s/n 68639L
> near Toronto, Canada
> <Triumph rpm to mph.xls>
> ** triumphs@autox.team.net **
>=20
> Donate: http://www.team.net/donate.html
> Archive: http://www.team.net/pipermail/triumphs http://www.team.net/archi=
ve
>=20
> Unsubscribe/Manage: http://autox.team.net/mailman/options/triumphs/john.ma=
cartney@ukpips.org.uk
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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto">It=E2=80=99s important to remember that car=
s without overdrive had a higher axle ratio than those with it. As an exampl=
e, the GT6+ had a 3.27 final drive for non overdrive and 3.89 for overdrive.=
Just to complicate things, it was entirely possible to order a 3.27 diff wi=
th overdrive on top! The factory never promoted this facility for fairly obv=
ious reasons. My own GT6 mk 2 was supplied like that becxause I knew my way a=
round the factory build books. Iit made an excellent cruiser with good fuel c=
onsumption but could not pull more than 4000 rpm, even downhill on a motorwa=
y. That said, refuelling was a little less frequent.<div><br></div><div>Jonm=
ac<br><br><div id=3D"AppleMailSignature" dir=3D"ltr">At the Battle of Waterl=
oo, 1815:<div>Lord Uxbridge: =E2=80=9CBy God, Sir - I=E2=80=99ve lost m=
y leg=E2=80=9D</div><div>Duke of Wellington: =E2=80=9CBy God, Sir - so you h=
ave!=E2=80=9D</div><div><br></div></div><div dir=3D"ltr"><br>On 1 Jun 2020, a=
t 19:41, Dave MacKay <<a href=3D"mailto:dave@mdmackay.ca";>dave@mdmackay.c=
a</a>> wrote:<br><br></div><blockquote type=3D"cite"><div dir=3D"ltr"><me=
ta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dutf-8"><meta n=
ame=3D"Generator" content=3D"Microsoft Word 15 (filtered medium)"><style><!-=
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--></style><div class=3D"WordSection1"><p class=3D"MsoPlainText">>Date: S=
un, 31 May 2020 16:52:23 -0500</p><p class=3D"MsoPlainText">>From: bill b=
eecher <<a href=3D"mailto:notakitcar@yahoo.com";>notakitcar@yahoo.com</a>&=
gt;</p><p class=3D"MsoPlainText">>Subject: [TR] RPM speed calc</p><p clas=
s=3D"MsoPlainText">> </p><p class=3D"MsoPlainText">>Came across t=
his calculator with all the right input fields. But, I wonder how accu=
rate it really is given the following input. </p><p class=3D"MsoPlainText">&=
gt;TR3 with a 3.7 rear, OD at redline of 5,000rpm. Vredestein 165R/15 t=
ires, 25.4? diameter. Should be moving along at 124mph!</p><p cl=
ass=3D"MsoPlainText">> </p><p class=3D"MsoPlainText">><a href=3D"=
https://wahiduddin.net/calc/calc_speed_rpm.htm";>https://wahiduddin.net/calc/=
calc_speed_rpm.htm</a></p><p class=3D"MsoPlainText">> </p><p class=3D=
"MsoPlainText">>Anyone get a different answer? </p><p class=3D"MsoPlainTe=
xt">>Bill</p><p class=3D"MsoNormal"> </p><p class=3D"MsoNormal">Here=
(attached) is a spreadsheet that I wrote to calculate speed versus rpm give=
n different parameters. I wrote it to check my speedo after I installed an H=
VDA transmission. If the spreadsheet doesn=E2=80=99t make it through the lis=
t as an attachment, just e-mail me directly and I=E2=80=99ll send it to you.=
</p><p class=3D"MsoNormal"> </p><p class=3D"MsoNormal">With a standard T=
riumph gearbox + overdrive, and the parameters you gave, I calculate speed a=
t 5000 rpm in top gear (with overdrive) as being 124.5 mph. Note that, I thi=
nk that the tire diameter is 25.25=E2=80=9D, slightly less than you indicate=
d.</p><p class=3D"MsoNormal"> </p><p class=3D"MsoNormal">I hasten to ad=
d that calculating a speed and believing it=E2=80=99s achievable are two dif=
ferent things!</p><p class=3D"MsoNormal"> </p><p class=3D"MsoNormal">Re=
gards,</p><p class=3D"MsoNormal"> </p><p class=3D"MsoNormal">Dave MacKa=
y</p><p class=3D"MsoNormal">1960 TR3A s/n 68639L</p><p class=3D"MsoNormal">n=
ear Toronto, Canada</p></div>
</div></blockquote><blockquote type=3D"cite"><div dir=3D"ltr"><Triumph rp=
m to mph.xls></div></blockquote><blockquote type=3D"cite"><div dir=3D"ltr=
"><span>** <a href=3D"mailto:triumphs@autox.team.net";>triumphs@autox.team.ne=
t</a> **</span><br><span></span><br><span>Donate: <a href=3D"http://www.team=
.net/donate.html">http://www.team.net/donate.html</a></span><br><span>Archiv=
e: <a href=3D"http://www.team.net/pipermail/triumphs";>http://www.team.net/pi=
permail/triumphs</a> <a href=3D"http://www.team.net/archive";>http://ww=
w.team.net/archive</a></span><br><span></span><br><span>Unsubscribe/Manage: <=
a href=3D"http://autox.team.net/mailman/options/triumphs/john.macartney@ukpi=
ps.org.uk">http://autox.team.net/mailman/options/triumphs/john.macartney@ukp=
ips.org.uk</a></span><br></div></blockquote></div></body></html>=
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** triumphs@autox.team.net **
Archive: http://www.team.net/pipermail/triumphs http://www.team.net/archive
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