How low do you let your 4by Lug??.

Submitted: Thursday, Apr 28, 2011 at 19:19
ThreadID: 85930 Views:2896 Replies:5 FollowUps:14
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We all know about fifth gear probs if you work them hard when towing. but unladen it seems some are oblivious to this fact!.

Went for a run with a mate to-day in a td5 landrover, now these things pull very well for the size of the engine, but when your down around 5oks /hr ,and the thing is moaning, its time to find a better cog don't you think?. I know with my TDI i dont' run under 6okm/hr in top gear, flat or hilly country. I asked him about it in a round about way,and the response was a shrug of the shoulders, "always drive like that", His gearbox i guess..LOL. The V8 Petrol landcruiser and swmbo are a bit of a worry in constant heavy traffic, ijust leaves it in OD .but at least the auto can soak up a bit of strain....lol.

Cheers Axle.
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Reply By: Notso - Thursday, Apr 28, 2011 at 19:40

Thursday, Apr 28, 2011 at 19:40
No vehicle should be allowed to "Lug" in the gears.

As it happens the gearboxes in the Landrovers are a different design to the Yotas, Nissan etc. At least that's what the RAC reckons, apparently they don 't have the overdrive top gear.

It seems all the gears are on the main cluster so you don't get the same issues with them. Having said that there are probably other problems caused by "Lugging" with these boxes.
AnswerID: 452612

Follow Up By: Axle - Thursday, Apr 28, 2011 at 20:10

Thursday, Apr 28, 2011 at 20:10
The R380 landrover Box is very Good, But also very light, can't see lugging .

doing them any good.


Cheers Axle.
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Reply By: snoopyone - Thursday, Apr 28, 2011 at 19:55

Thursday, Apr 28, 2011 at 19:55
Never !!!! always use 4th auto when towing and quite often drop it into 4th in traffic so that it has 1 less to drop down from
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Follow Up By: Axle - Thursday, Apr 28, 2011 at 20:12

Thursday, Apr 28, 2011 at 20:12
Could you tell my missus that please!!....LOL.



Cheers Axle.
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Follow Up By: snoopyone - Thursday, Apr 28, 2011 at 20:16

Thursday, Apr 28, 2011 at 20:16
Just show her the thread.

LOL
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Follow Up By: Madfisher - Thursday, Apr 28, 2011 at 21:36

Thursday, Apr 28, 2011 at 21:36
Mmnnn, if its an auto leave it in drive, and the computer will always pick the best ratio for the job at hand. Although on Rosa buses I click the overdrive off coming downhill to let the exhaust brakes work better.
Cheers Pete
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Follow Up By: snoopyone - Thursday, Apr 28, 2011 at 21:48

Thursday, Apr 28, 2011 at 21:48
Hmmm A fallacy. If you do that when towing it will hunt up and down and kill itself.

Have you not read the threads on towing in 5th gear, or perhaps it should be
named " Why not to tow in 5th gear."

Lots of Nissan owners will vouch for that from 1998 on.

When towing in 5th (O/D) mine would hunt up and down on a fairly flat road and actually run 100deg HOTTER in 5th than in 4th.



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Follow Up By: Madfisher - Thursday, Apr 28, 2011 at 22:17

Thursday, Apr 28, 2011 at 22:17
Agree snoopyone, but The orinigal thread did not refer to towing . We have both an auto and man 4wd. In the auto (which is a very lazy auto and hates changing down) I either use the power button or knock it back to 3rd(4speed auto). But heat is a major killer of autos
Good discussion, best their has been on exploreoz for a while.
Cheers Pete
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Follow Up By: Rockape - Friday, Apr 29, 2011 at 08:19

Friday, Apr 29, 2011 at 08:19
Madfish Pete,
bit off topic but those Mitsi Rosa buses are a great unit. Three of ours have just been retired with around 580000 on the clocks and 15000hrs on the engines. In that time no major mechanical issues at all, just niggly problems at the end of life ( electrics mainly). Steer tyre wear was a bit of an issue at first.

Have a good one
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Follow Up By: Madfisher - Friday, Apr 29, 2011 at 12:49

Friday, Apr 29, 2011 at 12:49
Yes till you get the alignment right it is a problem. We have a old footballers special with vinyl seats . The other three have been brought new and eqa one has got more refined. The latest 6speed man with the dohc motor is a cracker.
We have also had a good run out of our coaster, but I thinkit has only around 230000ks from memory.
Cheers Pete
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Reply By: Madfisher - Thursday, Apr 28, 2011 at 19:59

Thursday, Apr 28, 2011 at 19:59
I know my jack will be different as it is a dohc v6. But I never let it drop under 80 in 5th. Fourth is a diff mater and it will pull from 1000rpm with ease which is about 35ks. But the longer stroke 3.5 is a diff beast to the short stroke 3.2.
As long as you use gentle throttle openings I think it is ok in any of the direct gears or lower.
Cheers Pete
AnswerID: 452616

Follow Up By: Axle - Thursday, Apr 28, 2011 at 20:16

Thursday, Apr 28, 2011 at 20:16
They must have good torque Pete, even in 4th to pull from those revs.



Cheers Axle.
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Follow Up By: Madfisher - Thursday, Apr 28, 2011 at 21:33

Thursday, Apr 28, 2011 at 21:33
Yes Axle for a dohc it is not a peaky motor. I think they learn their lesson with the short stroke 3.2. When towing I drop back to fourth at 100ks to keep it at max torque.
I drive heaps of diff tds most days and my jack has got heaps more urge at low revs. No trouble to do a round about in fourth, and fouth pulls the same gearing as our old Paj did in fifth.
The secret to the low down torque in these motors was the variable intake lenght. In my young days and playing with warmed up motors, we could never get low down torque and top end. Mate had a souped up v12 jag with motec fuel injection. He made the very short intake runners himself. A 202 could beat it off the mark, but holy dooley when it hit 4500 rpm you had better be hanging on.
The standard redline was 7500rpm,. and this thing would hurdle past that. The intake noise was so good I always use to turn the radio off so I could listen to it with no back ground noises. Anyway I am getting off topic sorry.
Cheers Pete
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Follow Up By: Rockape - Friday, Apr 29, 2011 at 08:22

Friday, Apr 29, 2011 at 08:22
Axle,
guess some people don't mind trying to put the bigends though the bottom of the sump.

Have a good one.
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Follow Up By: Axle - Friday, Apr 29, 2011 at 08:24

Friday, Apr 29, 2011 at 08:24
LOL!!.
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Follow Up By: Madfisher - Friday, Apr 29, 2011 at 12:54

Friday, Apr 29, 2011 at 12:54
Yes He was an over paid engineer, with two spares engines. But it only had a 70 mm stroke so piston speed would not have been that high, and being a v12 it was beautifully balanced. Plus it was only 5.3lt. He use to get more concerned about low oil temps if cruising in slow traffic.
CheersPete
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FollowupID: 725411

Reply By: WBS - Friday, Apr 29, 2011 at 08:41

Friday, Apr 29, 2011 at 08:41
Lugging not only impacts on the drive train, it also causes engine temperature to rise dramatically and very quickly. My pyrometer educated me on that problem.

WBS
AnswerID: 452692

Follow Up By: Madfisher - Friday, Apr 29, 2011 at 12:58

Friday, Apr 29, 2011 at 12:58
That would depend on trottle openings, on a very slightly opened trottle it is not an issue. But I never lug up hills anyway, just a bit lazy on round abouts .On hills I will change down so it is on max toque in the next gear. Max Torque in the Jack is 3100rpm.
Cheers Pete
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FollowupID: 725414

Reply By: kiwicol - Friday, Apr 29, 2011 at 09:57

Friday, Apr 29, 2011 at 09:57
Cant beat the old GQ patrols, mine has done 400,000ks, motor and drive train has never been touched, always toed in 5th, whether towing a 20ft boat or the c/t, around town stay in 5th and go down to 900 revs and pull away no problems, and still on 2nd clutch, plus the lsd still works like new.

Col
AnswerID: 452703

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