Author Topic: Question re towing and using overdrive  (Read 1993 times)

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Offline areyonga

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Question re towing and using overdrive
« on: April 08, 2013, 01:20:38 PM »
I am interested to know your thoughts on towing and if the economy is better in top gear or overdrive.  I have a 100 series landcruiser and towing about a 1.6 tonne Goldstream, I usually use top gear in the hills and overdrive in the flatter country.  While it tows in overdrive well on the flat it does drop back regularly with inclines and was interested in others experience with possible leaving it out of overdrive altogether and how that effects economy.

Appreciate your thoughts/experience.

Trevor
105 Series Landcruiser Dual Fuel, and 2012 Goldstream Storm with Independent Suspension, gas heating etc etc etc etc

Offline muzza01

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Re: Question re towing and using overdrive
« Reply #1 on: April 08, 2013, 01:40:07 PM »
Hi Trevor,
do you have the 1HDFTE with H150/H151?

Offline BigJules

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Re: Question re towing and using overdrive
« Reply #2 on: April 08, 2013, 02:32:18 PM »
I don't know the numbers, but 4sp or 5sp?

I have read numerous times on here and other forums that one shouldn't tow in overdrive, though those comments weren't necessarily just about LC100/105s.

I've had both and just put it in Drive. Over the last few years I've been towing some really big loads (3T++) with my V8+5sp auto. On several trips I tried putting it into 4th instead of D, can't say I noticed any difference whatsoever.

Offline BigJules

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Re: Question re towing and using overdrive
« Reply #3 on: April 08, 2013, 02:35:24 PM »
I should add that the only thing I found that made an appreciable difference was speed. Less than 100kph was significantly more economical, as you woudl expect.

Also, it didn't matter much if was towing 1T, 2T or 3T+, the economy might have varied by another 1L/100km/T after the base increase of 3-4L/100km, based on doing the speed limit up hill and down dale, north, south and west of Sydney.

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Re: Question re towing and using overdrive
« Reply #4 on: April 08, 2013, 02:43:42 PM »
Always used OD in my 100, only in the reall up and down stuff that I turned it off, never had a problem.  On my old BA was a different story though, a replacement transmission and diff taught me not to use OD.

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Offline areyonga

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Re: Question re towing and using overdrive
« Reply #5 on: April 08, 2013, 02:58:30 PM »
Hi Trevor,
do you have the 1HDFTE with H150/H151?
Its a Petrol, FZJ 105

Trevor
105 Series Landcruiser Dual Fuel, and 2012 Goldstream Storm with Independent Suspension, gas heating etc etc etc etc

Offline muzza01

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Re: Question re towing and using overdrive
« Reply #6 on: April 08, 2013, 03:25:00 PM »
 I think you have the H151, It is a stronger box than the HZJ, totally different design. 5th gear is part of the main cluster. The box has so should be fine for towing.  Its not a bad thing to load up 4th when under load (going up a hill with the trailer)

Offline kiva

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Re: Question re towing and using overdrive
« Reply #7 on: April 08, 2013, 03:30:44 PM »
I also have an FZJ105R, so apologies for sounding like a dimwit, what does "4th" or "5th" gear mean with the auto. My gearstick has "R", "D", "2", "1", an overdrive button and a "PWR" button. What do they do?

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Offline muzza01

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Re: Question re towing and using overdrive
« Reply #8 on: April 08, 2013, 03:42:46 PM »
Sorry kiva.  I was talking about the manual box.

Offline Roo

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Re: Question re towing and using overdrive
« Reply #9 on: April 08, 2013, 11:43:29 PM »
I also have an FZJ105R, so apologies for sounding like a dimwit, what does "4th" or "5th" gear mean with the auto. My gearstick has "R", "D", "2", "1", an overdrive button and a "PWR" button. What do they do?
hi kiva, I have the same 4 speed auto box in my 100 TD. With O/D (overdrive) off you have 3 gears. 3rd gear is 1:1 ratio or direct drive. Press the O/D button and the box will be able to select 4th gear overdrive. The manual box has 4th gear @1:1 ratio and 5th is overdrive. I just drive around with O/D on all the time and occasionally switch it off when I want to manually pick 3rd gear.
PWR button is a different shift pattern for the auto when requiring more response. I've read many with the FZJ auto recommend using the PWR button when driving around town. It will hold gears longer when accelerating and kick back sooner. I don't find any noticeable difference with the diesel but the petrol motor seems to respond better and get better economy too.
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Offline kiva

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Re: Question re towing and using overdrive
« Reply #10 on: April 09, 2013, 08:12:00 AM »
Thanks Roo, that makes things much clearer now. Do you think "PWR" is suitable when towing, or is it just for around town?

Another question; if I am towing up a hill and I manually drop back a gear (or two), the engine revs go up (of course), however I get more power to get up the hill. Is that something I should do or should I just leave the gear in "D", go up the hill slowly, and let the gearbox work it out? Is the increase in engine revs detrimental, meaning extra stress on the engine, gearbox, heat etc?

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Offline muzza01

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Re: Question re towing and using overdrive
« Reply #11 on: April 09, 2013, 08:22:33 AM »
Hi Kiva,
I would recommend that when you are towing up a hill that you turn the O/D off.  If it is a very steep hill select 2 and leave it there until you can see the the road is suitable to change into 3.  Otherwise the taco will keep telling the torque converter to change from 3 to 2 to 3 to 2 etc.  This is not a "rule of thumb", this is for situations where you notice the auto constantly changing between the two gears every 30 seconds or so.
Coming down the range I would also de-select to O/D and use the same principal.  Your autobox is a very strong and bulletproof gearbox; but manually changing in certain conditions will enhance it's lifespan.

Offline kiva

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Re: Question re towing and using overdrive
« Reply #12 on: April 09, 2013, 09:32:42 AM »
Thanks Muzza. I learned using a manual gearbox, so I always found the auto somewhat "mysterious" as I keep thinking in terms of a manual but wasn't sure how to apply that to the auto.

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Offline Roo

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Re: Question re towing and using overdrive
« Reply #13 on: April 09, 2013, 11:08:57 AM »
Kiva, when you hit the hills, drive the box manually. Pick the gear that keeps the revs in the sweet spot and hold it there. 2nd gear in the A442 4spd is quite long so it should keep you pumping along in the steeper stuff otherwise just hit the O/D button to drop back and let the torque convertor lock up. Heat kills auto boxes and letting the box flick up and down gears slipping(unlocked) will generate lots of heat. The turbo diesel has a secondary gearbox cooler in front of the air con condenser, not sure if the petrol models do too, if not I would look into getting one if you do a bit of towing or beach driving.
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Offline areyonga

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Re: Question re towing and using overdrive
« Reply #14 on: April 09, 2013, 11:32:14 AM »
Good info, thanks all
105 Series Landcruiser Dual Fuel, and 2012 Goldstream Storm with Independent Suspension, gas heating etc etc etc etc

Offline kiva

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Re: Question re towing and using overdrive
« Reply #15 on: April 09, 2013, 12:24:34 PM »
Ta, thanks Roo.

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Offline MR MAC GU

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Question re towing and using overdrive
« Reply #16 on: April 09, 2013, 02:58:43 PM »
Towing in overdrive is the quickest way to shorten the life of an auto box. Towing in drive 1:1 ratio is the strongest gear to put under load and creates the least heat which is the main killer of auto boxes.

The slight bit of extra fuel used between drive and overdrive is a drop in the ocean compared to an auto box rebuild.

Plenty of people tow on overdrive with no problems but lots do destroy them too.


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Offline BigJules

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Re: Question re towing and using overdrive
« Reply #17 on: April 09, 2013, 03:29:42 PM »
The turbo diesel has a secondary gearbox cooler in front of the air con condenser, not sure if the petrol models do too, if not I would look into getting one if you do a bit of towing or beach driving.

All auto 100s have the additional cooler.

Offline kiva

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Re: Question re towing and using overdrive
« Reply #18 on: April 09, 2013, 03:32:17 PM »
Jules - including the 105's?

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Offline BigJules

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Re: Question re towing and using overdrive
« Reply #19 on: April 09, 2013, 03:55:05 PM »
Jules - including the 105's?
Definitely. Standard equipment. I had an auto 105 for 7 years.

I take the point above about towing in O/D and heat.

Offline kiva

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Re: Question re towing and using overdrive
« Reply #20 on: April 09, 2013, 03:57:09 PM »
Definitely. Standard equipment. I had an auto 105 for 7 years.

I take the point above about towing in O/D and heat.

Ta, thanks for the info. I'll try not to cook the transmission.

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