[Fot] Adding type A OD

[J.C. Hassall]

 Amici,
An electrical engineer friend, Dale Osterndorf (od_cntl at hotmail.com) designed a robust controller which accomplishes exactly what you’re looking for. 

NFI, etc.

jim

Fat-thumbed from my iPhone7

> On Feb 21, 2018, at 10:26 PM, Greg Blake via Fot <fot at autox.team.net> wrote:
> 
> 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
>> _______________________________________________
>> fot at autox.team.net
>>  
>> http://www.fot-racing.com
>>  
>> Donate: http://www.team.net/donate.html
>> Archive: http://www.team.net/archive
>> Forums: http://www.team.net/forums
>> Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/jwheeler1947@yahoo.com
>>  
>>  
>> _______________________________________________
>> fot at autox.team.net
>> 
>> http://www.fot-racing.com
>> 
>> Donate: http://www.team.net/donate.html
>> Archive: http://www.team.net/archive
>> Forums: http://www.team.net/forums
>> Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/gt6steve@aol.com
>> 
>> 
>> <Overdrive Lockout Wiring.pdf>
>> _______________________________________________
>> fot at autox.team.net
>> 
>> http://www.fot-racing.com
>> 
>> Donate: http://www.team.net/donate.html
>> Archive: http://www.team.net/archive
>> Forums: http://www.team.net/forums
>> Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/gblake58tr3@icloud.com
> _______________________________________________
> fot at autox.team.net
> 
> http://www.fot-racing.com
> 
> Donate: http://www.team.net/donate.html
> Archive: http://www.team.net/archive
> Forums: http://www.team.net/forums
> Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/jhassall@gmail.com
> 
> 
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://autox.team.net/pipermail/fot/attachments/20180224/0aeae4a0/attachment-0001.htm>