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<p>I ran with the switches in the top cover and didn't find any
issues downshifting while leaving the OD on - even though it drops
out momentarily I never noticed it. For me it was more often a
4OD to 3OD downshift. Didn't seem worth bypassing the switches to
me. It does make the circuit simpler with less to go wrong
(removing the switches).</p>
<p>Tony<br>
</p>
<br>
<div class="moz-cite-prefix">On 2/24/2018 10:56 AM, Greg Blake via
Fot wrote:<br>
</div>
<blockquote type="cite"
cite="mid:A09F6822-2809-4BA3-9DD8-165FC750F8BF@icloud.com">
<meta http-equiv="content-type" content="text/html; charset=utf-8">
<div>Anyone ever try bypassing the top cover interrupt switches to
allow a down shift directly into 2nd OD or 3rd OD?</div>
<div id="AppleMailSignature"><br>
</div>
<div id="AppleMailSignature">I understand the risk of OD
engagement while shifting into reverse, but ignoring that for
this little walk around the park, what would be the problem(s)
with this approach?<br>
<br>
Sent from my iPhone</div>
<div><br>
On Feb 24, 2018, at 8:32 AM, J.C. Hassall <<a
href="mailto:jhassall@gmail.com" moz-do-not-send="true">jhassall@gmail.com</a>>
wrote:<br>
<br>
</div>
<blockquote type="cite">
<div>
<meta http-equiv="content-type" content="text/html;
charset=utf-8">
<div><span></span></div>
<div>
<meta http-equiv="content-type" content="text/html;
charset=utf-8">
Amici,
<div>An electrical engineer friend, Dale Osterndorf (<a
href="mailto:od_cntl@hotmail.com" moz-do-not-send="true">od_cntl@hotmail.com</a>)
designed a robust controller which accomplishes exactly
what you’re looking for. </div>
<div><br>
</div>
<div>NFI, etc.</div>
<div><br>
</div>
<div>jim<br>
<div><br>
<div id="AppleMailSignature">Fat-thumbed from my iPhone7</div>
<div><br>
On Feb 21, 2018, at 10:26 PM, Greg Blake via Fot <<a
href="mailto:fot@autox.team.net"
moz-do-not-send="true">fot@autox.team.net</a>>
wrote:<br>
<br>
</div>
<blockquote type="cite">
<div>
<meta http-equiv="content-type" content="text/html;
charset=utf-8">
<div>Mike this is awesome, exactly what I was
looking for. </div>
<div id="AppleMailSignature"><br>
</div>
<div id="AppleMailSignature">All of the other
responses were informative as well. I love this
group. </div>
<div id="AppleMailSignature"><br>
</div>
<div id="AppleMailSignature">Thanks. </div>
<div id="AppleMailSignature"><br>
</div>
<div id="AppleMailSignature">Greg<br>
<br>
Sent from my iPhone</div>
<div><br>
On Feb 21, 2018, at 12:30 PM, M&M Hado via Fot
<<a href="mailto:fot@autox.team.net"
moz-do-not-send="true">fot@autox.team.net</a>>
wrote:<br>
<br>
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<div class="WordSection1">
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif";color:black">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:<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif";color:black"><a
href="https://www.revingtontr.com/engine-transmission/gearbox/logic-overdrive-device"
moz-do-not-send="true">https://www.revingtontr.com/engine-transmission/gearbox/logic-overdrive-device</a><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif";color:black">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.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif";color:black">Mike<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">
Fot [<a
href="mailto:fot-bounces@autox.team.net"
moz-do-not-send="true">mailto:fot-bounces@autox.team.net</a>]
<b>On Behalf Of </b>Steve Smith via Fot<br>
<b>Sent:</b> Wednesday, February 21, 2018
10:34 AM<br>
<b>To:</b> <a
href="mailto:jwheeler1947@yahoo.com"
moz-do-not-send="true">jwheeler1947@yahoo.com</a>;
<a href="mailto:fot@autox.team.net"
moz-do-not-send="true">fot@autox.team.net</a><br>
<b>Subject:</b> Re: [Fot] Adding type A OD<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black">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 <o:p></o:p></span></p>
<div>
<p class="MsoNormal"
style="margin-bottom:12.0pt"><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black"><br>
<br>
<o:p></o:p></span></p>
<div>
<p class="MsoNormal"
style="margin-bottom:12.0pt"><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black">-----Original
Message-----<br>
From: Jack Wheeler via Fot <<a
href="mailto:fot@autox.team.net"
moz-do-not-send="true">fot@autox.team.net</a>><br>
To: Greg Blake via Fot <<a
href="mailto:fot@autox.team.net"
moz-do-not-send="true">fot@autox.team.net</a>><br>
Sent: Wed, Feb 21, 2018 8:12 am<br>
Subject: Re: [Fot] Adding type A OD<o:p></o:p></span></p>
<div
id="AOLMsgPart_1.2_bb2a2d2c-61c7-41f8-957b-719c2af0c7a9">
<div>
<div>
<div>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black">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.<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black"><o:p> </o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black">Jack
Wheeler<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black"><o:p> </o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:black"><o:p> </o:p></span></p>
</div>
<div
id="aolmail_ydpaf1b4a8ayahoo_quoted_9632966617">
<div>
<div>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A">On
Wednesday, February 21,
2018, 4:14:18 AM EST, Greg
Blake via Fot <<a
href="mailto:fot@autox.team.net"
moz-do-not-send="true">fot@autox.team.net</a>>
wrote: <o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A"><o:p> </o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A"><o:p> </o:p></span></p>
</div>
<div>
<div>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A">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. <o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A"><o:p> </o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A">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. <o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A"><o:p> </o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A">Appreciate
the ideas. <o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A"><o:p> </o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A">Greg<o:p></o:p></span></p>
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<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Helvetica","sans-serif";color:#26282A">Sent
from my iPhone<o:p></o:p></span></p>
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<blockquote type="cite">
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