[Fot] Adding type A OD

[Greg Blake]

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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