[TR] O/D safety switch

[Geo Hahn]

And on a mountain grade of about 6% (and no traffic to slow you down) 3rd
OD is my gear of choice as 4th isn't quite enough and 3rd is definitely too
much.


On Sun, Aug 31, 2014 at 4:17 PM, Andrew Uprichard <auprichard at uprichard.net>
wrote:

> Yes, but if you are on a tight winding road, it's fun just to kick the car
> in and out of overdrive in third rather than shift up and down.
>
> Andrew Uprichard
>
> -----Original Message-----
> From: Triumphs [mailto:triumphs-bounces at autox.team.net] On Behalf Of
> Randall
> Sent: Sunday, August 31, 2014 6:43 PM
> Cc: 'Triumphs'
> Subject: Re: [TR] O/D safety switch
>
> > this allows only using O/D in 4th
> > gear.. better than nothing I guess..
>
> Just a SWAG, but the GT6 used the D-type OD which was marginal even behind
> the much smaller Spitfire motor.  My _guess_ is that they limited it to 4th
> gear because the OD could not handle the engine torque multiplied by the
> 3rd
> gear ratio.
>
> I don't know how the ratios work out on the GT6, but on the TR2-6, 3rd OD
> is
> so close to 4th direct that it's almost not a separate gear.  That's not to
> say 3rd OD is totally useless, but it's also not a big loss, IMO.
>
> Randall
>
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