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Am I missing something? I just check accuracy with the GPS on my phone.
On Sun, Jun 13, 2021, 3:25 PM i erbs via Healeys <healeys@autox.team.net>
wrote:
> My tach is driven by my distributor gear
> Speedo comes off my transmission. Not sure about the relationship to
> accuracy.
>
> Ira Erbs
> 1959 AH 100-6
> 1967 MGB
> Milwaukie, OR
>
> On Sun, Jun 13, 2021, 11:50 AM banjojohn <banjojohn@cox.net> wrote:
>
>> Thanks.
>> I am actually just comparing the tach with the speedometer indicated
>> speed, which, I believe reads a little high due to tire size. But the
>> relationship between the indicated speed and the tach should be consistant
>> since they are both driven by actual engine or output shaft speed.
>>
>> John
>>
>>
>> Sent from my T-Mobile 4G LTE Device
>>
>>
>> -------- Original message --------
>> From: Bob Spidell via Healeys <healeys@autox.team.net>
>> Date: 6/12/21 12:25 PM (GMT-06:00)
>> To: Bob Haskell <rchaskell@earthlink.net>, healeys@autox.team.net
>> Subject: Re: [Healeys] Speed to RPM ratio?
>>
>> That's it!
>>
>> On 6/11/2021 4:31 PM, Bob Haskell wrote:
>> > http://longstonetyres.co.uk
>> >
>> > Cheers,
>> >
>> > Bob Haskell
>> > Austin Healey 3000 BN7/BT7 registrar
>> >
>> > On 6/11/21 7:01 PM, Bob Spidell wrote:
>> >> Note there is a not insignificant difference in diameters of tires
>> >> with the same nominal size (e.g. '165/80-15'). The English tire
>> >> site--can't think of the name offhand--has (had?) a table comparing
>> >> the diameters of different brands/models of the same size tires, and
>> >> IIRC they could differ by as much as half an inch. I'd say to measure
>> >> the actual diameter of your tires, but it's kinda hard when moving;
>> >> the 'flat spot' goes away--partially, at least--and the tires 'grow'
>> >> some from centrifugal force (anyone seen film of top fuel dragsters
>> >> launching; the rear tires must expand a few inches or more?).
>> >>
>> >>
>> >> On 6/11/2021 3:36 PM, John OBrien wrote:
>> >>> Thanks to all who replied. These will give me something to work with.
>> >>>
>> >>> John
>> >>>
>> >>> On 6/11/2021 4:26 PM, John OBrien wrote:
>> >>>> Hi Guys and Gals
>> >>>>
>> >>>> I am trying to calibrate my tach. I installed a Spiyda RVI - RVC
>> >>>> conversion board, because my tach was acting wierd. Anyway, I am
>> >>>> still trying to get this setup to read correctly. My question is,
>> >>>> on my BJ8 with standard 3.9:1 diff. what should my RPMs be in
>> >>>> fourth gear going 50 MPH , without overdrive engaged. I'm running
>> >>>> 165/80R15 tires. I'm just looking for a reference point to compare
>> >>>> what should be, and what I am reading.
>> >>>>
>> >>>> Any help is appreciated.
>> >>>>
>> >>>> Thanks
>> >>>>
>> >>>> John
>> >>>>
>> >>
>>
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<div dir=3D"auto">Am I missing something?=C2=A0 I just check accuracy with =
the GPS on my phone.</div><br><div class=3D"gmail_quote"><div dir=3D"ltr" c=
lass=3D"gmail_attr">On Sun, Jun 13, 2021, 3:25 PM i erbs via Healeys <<a=
href=3D"mailto:healeys@autox.team.net";>healeys@autox.team.net</a>> wrot=
e:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;bo=
rder-left:1px #ccc solid;padding-left:1ex"><div dir=3D"auto">My tach is dri=
ven by my distributor gear<div dir=3D"auto">Speedo comes off my transmissio=
n.=C2=A0 Not sure about the relationship to accuracy.=C2=A0<br><br><div dat=
a-smartmail=3D"gmail_signature" dir=3D"auto">Ira Erbs<br>1959 AH 100-6<br>1=
967 MGB<br>Milwaukie, OR</div></div></div><br><div class=3D"gmail_quote"><d=
iv dir=3D"ltr" class=3D"gmail_attr">On Sun, Jun 13, 2021, 11:50 AM banjojoh=
n <<a href=3D"mailto:banjojohn@cox.net"; target=3D"_blank" rel=3D"norefer=
rer">banjojohn@cox.net</a>> wrote:<br></div><blockquote class=3D"gmail_q=
uote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1e=
x"><div dir=3D"auto"><div dir=3D"auto">Thanks.</div><div dir=3D"auto">I am =
actually just comparing the tach with the speedometer indicated speed, whic=
h, I believe reads a little high due to tire size.=C2=A0 But the relationsh=
ip between the indicated speed and the tach should be consistant since they=
are both driven by actual engine or output shaft speed.</div><div dir=3D"a=
uto"><br></div><div dir=3D"auto">John</div><div dir=3D"auto"><br></div><div=
dir=3D"auto"><br></div><div id=3D"m_-8612040742838000386m_-799705985272531=
5655composer_signature" dir=3D"auto"><div style=3D"font-size:85%;color:#575=
757" dir=3D"auto">Sent from my T-Mobile 4G LTE Device</div></div><div dir=
=3D"auto"><br></div><div><br></div><div align=3D"left" dir=3D"auto" style=
=3D"font-size:100%;color:#000000"><div>-------- Original message --------</=
div><div>From: Bob Spidell via Healeys <<a href=3D"mailto:healeys@autox.=
team.net" rel=3D"noreferrer noreferrer" target=3D"_blank">healeys@autox.tea=
m.net</a>> </div><div>Date: 6/12/21 12:25 PM (GMT-06:00) </div><div>To=
: Bob Haskell <<a href=3D"mailto:rchaskell@earthlink.net"; rel=3D"norefer=
rer noreferrer" target=3D"_blank">rchaskell@earthlink.net</a>>, <a href=
=3D"mailto:healeys@autox.team.net"; rel=3D"noreferrer noreferrer" target=3D"=
_blank">healeys@autox.team.net</a> </div><div>Subject: Re: [Healeys] Speed =
to RPM ratio? </div><div><br></div></div>That's it!<br><br>On 6/11/2021=
4:31 PM, Bob Haskell wrote:<br>> <a href=3D"http://longstonetyres.co.uk=
" rel=3D"noreferrer noreferrer" target=3D"_blank">http://longstonetyres.co.=
uk</a><br>><br>> Cheers,<br>><br>> Bob Haskell<br>> Austin H=
ealey 3000 BN7/BT7 registrar<br>><br>> On 6/11/21 7:01 PM, Bob Spidel=
l wrote:<br>>> Note there is a not insignificant difference in diamet=
ers of tires <br>>> with the same nominal size (e.g. '165/80-15&#=
39;). The English tire <br>>> site--can't think of the name offha=
nd--has (had?) a table comparing <br>>> the diameters of different br=
ands/models of the same size tires, and <br>>> IIRC they could differ=
by as much as half an inch. I'd say to measure <br>>> the actual=
diameter of your tires, but it's kinda hard when moving; <br>>> =
the 'flat spot' goes away--partially, at least--and the tires '=
grow' <br>>> some from centrifugal force (anyone seen film of top=
fuel dragsters <br>>> launching; the rear tires must expand a few in=
ches or more?).<br>>><br>>><br>>> On 6/11/2021 3:36 PM, J=
ohn OBrien wrote:<br>>>> Thanks to all who replied.=C2=A0 These wi=
ll give me something to work with.<br>>>><br>>>> John<br>=
>>><br>>>> On 6/11/2021 4:26 PM, John OBrien wrote:<br>&g=
t;>>> Hi Guys and Gals<br>>>>><br>>>>> I a=
m trying to calibrate my tach.=C2=A0 I installed a Spiyda RVI - RVC <br>>=
;>>> conversion board, because my tach was acting wierd. Anyway, I=
am <br>>>>> still trying to get this setup to read correctly.=
=C2=A0 My question is, <br>>>>> on my BJ8 with standard 3.9:1 d=
iff. what should my RPMs be in <br>>>>> fourth gear going 50 MP=
H , without overdrive engaged.=C2=A0 I'm running <br>>>>> 1=
65/80R15 tires. I'm just looking for a reference point to compare <br>&=
gt;>>> what should be, and what I am reading.<br>>>>><=
br>>>>> Any help is appreciated.<br>>>>><br>>>=
;>> Thanks<br>>>>><br>>>>> John<br>>>&g=
t;><br>>><br><br>_______________________________________________<b=
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