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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