****New**** Triumph Stag Overdrive Logic Controller

[Mark S]

New invention seen on e-bay.

I assume this is just a latching relay that activates when the gear selector passes the switch?

[John]

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"We've all done it, an overtaking oppurtunity presents itself, change down, plant the throttle, and a second or so later ..... the overdrive kicks in!! No? Oh well it must just be me!"

Yes, I think it's just him. What a load of rubbish.

[SteveP]

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This has been discussed at length within the TSSC forum for Spitfires - see extract below:

Regards

Steve


Section : Overdrive[line]Overdrive TrickeryMark Stradling, 20-Oct-2006, 11:29am
Can't find the thread but there was a lot of talk on here and in the mag. about stopping the overdrive kicking in if you drop from o/d4th -> 3rd or o/d3rd -> 2nd ->3rd and forget to switch it off.

Just spotted this on fleaBay which might interest some...

http://cgi.ebay.co.uk/Triumph-TR3-TR4-TR5-TR6-Over...

(item250038505755)

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• Overdrive TrickeryVan Hamlin, 21-Oct-2006, 06:59pm
  http://www.tssc.org.uk/messageboard.asp?board=spit...
  
  The preferred circuit using 2 relays retains the original column switch and does not have overdrive current passing through either the column switch or the gearbox switch. It can be done with 1 relay if you are prepared to compromise.
  
  The article was written by Andy Stanton, I think it appeared in the July courier.
  
  

[seaside bill]

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John wrote:

"We've all done it, an overtaking oppurtunity presents itself, change down, plant the throttle, and a second or so later ..... the overdrive kicks in!! No? Oh well it must just be me!"

Yes, I think it's just him. What a load of rubbish.

John

A bit harsh.... I think it's actually quite a useful bit of kit, and yes, I've done ita fewtimes on my J type TR6 (Stag is auto). The other benefit is that it ensures o/d is always disengaged before you select reverse with potentially expensive results!

[redstag]

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Everyone to their own of course, but I'm with John on this one.

With this piece of kit your overdrive switch will say "on" when it's actuallyoffafter you havechanged gear. So if you then want the overdrive on I guess you then have to turn it off. And then on again. Not sure why it's called a logic controller:?

I'd rather just learn to turn it on and off when I wantand take pleasure in it being a feature that you have to control yourself thatsets it aside from a modern car. And when the day comes that gear changing in my Stag gets too complicated I'll change it back to auto



Pete

[Andrew S]

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If you are accelerating with performance in mind, then the overdrive should really be disengaged anyway and it goes in and out of over drive by use of the switch on the gearbox remote selector rod.

Seems a messy gimmick for people who don't know their cars.

Wonder what made them come up with the idea in the first place.........10 pints probably and low on income

Andrew

[seaside bill]

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Andrew

I disagree, image.....you're tootling down the road at 45/50mph behind a caravan/MGB (or both in convoy), when suddenly you see the overtaking opportunity you've been waiting thepast 30 mins for, instinctively you change down, floor the throttle and pull out....instead of the burst ofspeed anticipated you get a microsecond or so of acceleration before (whoops, I forget to turn it off) the o/d cuts back in and you're unexpectedly in a head-to-head with the HGV bearing down on you! In most cases you don't need o/d in third so having it automatically disengage is, in my view, helpful. The only time when I find o/d useful in 3rd is going up a long slow incline.

[Andrew S]

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I hear what you say, but the overdrive should be used for even levels or as an in between gear. before i ever over take in that position, the over drive comes out and the car has enough power at45-50 to get past, if not and i slow down and then its 3rd gear and a quicker acceleration.

It all depends on how we all drive and I would probably drive differently to others. i find my Stag nippy enough to get past at those speeds.

When I had my TR5 and TR6 the over drive was on the column and it was quick flick in and out, very convenient being that you could keep your hands on the steering wheel.

In my view, it is just as much agro put the over drive back in whilst the car is screaming as just flicking a switch on the gear stick

Andrew

[Stagdad]

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Once your used to the overdrive switch it should becomesecond nature.

You wouldn't forget to put your foot on the cluch when changing gearwould you

[redstag]

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Thefirst three cars I owned had overdrive so it became second nature some time ago.

I tend to use overdrive 3rd quite frequently in 'normal' drivingand nearly always when overtaking in third I flick it into o/d rather thanchanging into fourth.

What is a waste of time is wiring o/d to work in second. Must have used that at least once in the past two years.

Bill, are you going to fit one of these units? it will be interesting to know if they do improve the overall o/d operation.

Pete