Thread: Fairey Overdrive: S2A to S3 swap possible?

Originally Posted by Brisso57

Yes. I'd read that comment elsewhere.
If not Toro then, are there yet other makers of O/Drives for series LR's?

???

Doug

I used to own a Toro, they are out there. There was also another OD, but I don't think it made it to OZ.

There is the rocky mountain OD, but these are only available new and $$$.

IMHO, a better option, which would cost about the same, would be to get an LT77s from a 200Tdi (they are quite cheap), and buy an adaptor from Ashcroft to mate the box to a series T-case. (the LT77 will bolt straight up to any 4cyl series engine)

This will give you a REAL 5-speed, that is much stronger than the series box, and with none of the problems of an overdrive. The only downside is you will need to move the engine mounts about 4" forward and the rad panel a couple of inches forward, as the overall setup is slightly longer.

How about fitting high speed transfer case gears? No added in-efficiency of having an extra gear cluster and low range is not altered.
Aaron.

Originally Posted by Aaron IIA

How about fitting high speed transfer case gears? No added in-efficiency of having an extra gear cluster and low range is not altered.
Aaron.

Low range IS actually altered slightly, as the intermediate shaft must be moved and all the gears replaced to get a higher high range.

Factory (suffix C on and SIII) is 40:1 (first low), the high range T-case I am aware of is (there may be others) about 38:1. And that is the lowest you can go, it precludes the option of fitting the suffix B t-case gears that I have which give you 49:1 1st low.

Also - it costs about $1500 or so when I last asked, and is knowhere near as good as having a nice low 1st and a proper 5th gear. Also, don't even think about it if you have a 4cyl 109. A mate of mine was told by a retailler that his rebuilt 2.25P would pull a HR TC no problems. He tried it for a week before pulling it out and fitting a normal T-case. He said hill starts were near impossible in high range.

From what I was told, drive around not using first gear. Always take off in second. If you are happy with this, then consider high ratio gears. If you are not happy with starting in second gear, then don't get the high ratio transfer case gears.
Fourth gear is straight through, which is maximum efficiency. Fitting an aftermarket overdrive still means that fourth is straight through, but you now have the added in-efficiency of an extra gear changing the ratio. In an ideal world, you would be better to fit high speed differentials, with a five speed gearbox, where fifth was straight through, and not overdrive. This could be seen as a four speed with the addition of a built in underdrive.
The simplest method, would be to be contented driving at 80km/h, or wear earplugs and have a larger wallet/fuel tank to drive at 100km/h.
Aaron.

Originally Posted by Aaron IIA

.........The simplest method, would be to be contented driving at 80km/h, or wear earplugs and have a larger wallet/fuel tank to drive at 100km/h.
Aaron.

My experience is that the overdrive makes no appreciable difference to fuel consumption, possibly because it encourages you to drive faster than you would without it. The principal real use I have found for it is is conditions where you are driving in low range, but have an opportunity to go faster than is feasible in low fourth (but know you will need low again shortly), engaging overdrive enables you to stay in low range and not have to change into high range. Also useful for splitting gears, particularly for hills too steep for fourth, but not steep enough to really need third (but avoid use in first or second).

I agree with Aaron - if you wanted to drive at over 80 or 90, then you would have a Defender.

John

Originally Posted by JDNSW

My experience is that the overdrive makes no appreciable difference to fuel consumption, possibly because it encourages you to drive faster than you would without it. The principal real use I have found for it is is conditions where you are driving in low range, but have an opportunity to go faster than is feasible in low fourth (but know you will need low again shortly), engaging overdrive enables you to stay in low range and not have to change into high range. Also useful for splitting gears, particularly for hills too steep for fourth, but not steep enough to really need third (but avoid use in first or second).

John

I agree whith the above - no difference in fuel consumption, but I sit at 60mph on the highway rather than 50mph without the OD. Also very useful for splitting gears - and although not reccommended - 1st low OD was an extremely useful gear offroad.

I have a Toro in my 2a swb. If I do 60mph, there probably isn't very much difference in the fuel consumption most likely because of the inherent increase in wind resistance. However, if I keep my speed about 50mph I have seen 270miles out of a 45L tank. I didn't believe it myself, so I did the experiment over. Same result, 27mpg or 10.51L/100km.
Even allowing for error, it's a pretty respectable figure out of a 40 year old carby'd petrol. I've seen similar factory figures from Disco Tdis and Cruisers.

Dan.

Has anyone tried one of these?

Heystee Automotive BV

according to the wiki on them, the Santana rovers has a pretty good rep and these are a straight copy (according to the site)

andy