<div dir="ltr">My Nasty Boy has a Lempert rear, a Ford T5 transmission and a stock Healey speedometer. I made a couple of attempts to get them to play together that were unsuccessful. I saw on another forum a GPS driven unit that would allow me to use my stock speedo and I became a beta tester (full disclosure I get a free unit for being a beta tester) They are now in full production and the Classic Speed is now available for sale: <a href="http://www.classicautoinnovations.com/classic">http://www.classicautoinnovations.com/classic</a>. I'm very happy with it and solves the problem of running different non-stock rear ends and transmissions.<div><br></div><div>Happy Healeydays,</div><div>Rick Neville</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sun, Dec 4, 2016 at 4:34 PM, Bluehealey <span dir="ltr"><<a href="mailto:bluehealey@gmail.com" target="_blank">bluehealey@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi Bob.<br>
For what it's worth I have found that 1152TPM is the closest calibration I could get to suit the set up on Bluehealey. I have a 3.54 Lempert diff on overdrive box with 180XAS Michelins. Rolling radius of those I found to be 312mm (12.3").<br>
The set up uses a 32tooth worm wheel and 36 tooth Odo wheel. The displayed mileage and actual mileage are pretty close and have been checked over a few hundred miles against a Sat Nav. Error is about 1-2%.<br>
Your tyres will be the only variable with my arrangement.<br>
Speedo calibration is all over the place. I just moved the needle, relative to the drive cup, until 60mph matches my sat nav display. All other speeds above and below will be off a margin.<br>
Give me your rolling radius of the tyres and I will be able to provide the best Turns per mile sett up.<br>
Enjoy.<br>
<br>
Alan - from my iPad<br>
<br>
> On 4 Dec 2016, at 19:32, Bob Haskell <<a href="mailto:rchaskell@earthlink.net">rchaskell@earthlink.net</a>> wrote:<br>
><br>
> Listers,<br>
><br>
> What's the thickness of the washer that is fitted between the gearbox and the right angle drive (PN 3H550 or Moss PN 324-720)?<br>
><br>
> There are two MPH speedometers fitted to the 3000 MkI and MkII; one for overdrive and one for non-overdrive cars. What's the speedometer calibration (turns per mile) for each?<br>
><br>
> BMC P/N Smiths P/N TPM<br>
> non-OD BHA4124 SN6155/19 980???<br>
> OD BHA4126 SN6155/21 1080???<br>
><br>
> When fitting a 3.54:1 rear end to an overdrive equipped car, does the non-OD speedometer have the correct calibration? I think that it would if the gear ratios for the speedometer takeoffs on the extension housing of the non-OD gearbox and on the overdrive were the same. If not, what calibration (TPM) have folks used?<br>
><br>
> Cheers,<br>
><br>
> Bob Haskell<br>
> AHCA 3000 MkI registrar<br>
> <a href="http://www.ciahc.org/registry_3000mk1.php" rel="noreferrer" target="_blank">http://www.ciahc.org/registry_<wbr>3000mk1.php</a><br>
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