Mike this is awesome, exactly what I was looking for.
All of the other responses were informative as well. I love this group.
Thanks.
Greg
Sent from my iPhone
> On Feb 21, 2018, at 12:30 PM, M&M Hado via Fot <fot at autox.team.net> wrote:
>
> Yes, it?s annoying to me, also, when you forget to manually turn off the
> overdrive and then have it engage when going back into gear. There are at
> least a couple ways to have it drop out when passing through neutral. Here?s
> what I think is the easiest and is what I have on my TR4A:
>
> https://www.revingtontr.com/engine-transmission/gearbox/logic-overdrive-device
>
> If you want to do it yourself, you can also make the same functionality with
> a couple of DPDT relays per the attached diagram that I made up a few years
> ago for my TR3B because I kept forgetting to manually turn of the O.D.
>
> Mike
>
>
> From: Fot [mailto:fot-bounces at autox.team.net] On Behalf Of Steve Smith via
> Fot
> Sent: Wednesday, February 21, 2018 10:34 AM
> To: jwheeler1947 at yahoo.com; fot at autox.team.net
> Subject: Re: [Fot] Adding type A OD
>
> I DO NOT like the on-off toggle switch for the OD's as I would downshift out
> of OD and forget to toggle the switch to off so I went back into OD as soon
> as the third gear switch was reengaged. To combat this I used a standard
> electrical control scheme called "Three wire control" to engage the OD relay
> but drop it out when the shifter switch opened. To re-engage overdrive a
> pushbutton would activate the relay and latch itself in so the pushbutton was
> just momentary. Does that make sense? I can do a drawing if not clear.
> Steve
>
>
>
> -----Original Message-----
> From: Jack Wheeler via Fot <fot at autox.team.net>
> To: Greg Blake via Fot <fot at autox.team.net>
> Sent: Wed, Feb 21, 2018 8:12 am
> Subject: Re: [Fot] Adding type A OD
>
> For all of my 24 years of SCCA racing, I had the O/D switch mounted on my
> shift lever. Very convenient, and allowed for faster shifting.
>
> Jack Wheeler
>
>
> On Wednesday, February 21, 2018, 4:14:18 AM EST, Greg Blake via Fot <fot at
> autox.team.net> wrote:
>
>
> Looking for what Bosch relay I could substitute for the standard Lucas part
> number. Originally is not an issue as this is under the dash in my race car.
>
> Also looking for advice on OD switch location for the race car. What do you
> guys like to use? I was thinking a button on the steering wheel or on the
> shifter must be convenient.
>
> Appreciate the ideas.
>
> Greg
>
> Sent from my iPhone
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>
> <Overdrive Lockout Wiring.pdf>
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