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decent speed too fast in auto

Submitted: Tuesday, Apr 03, 2007 at 11:28

White Knight

A group of us went out on Sunday for a drive around the Morgon Quarry, 2 hours north of Adelaide (a great day out with the families). I have a 2005 100 series auto IFS landcruiser. The only issue I found was on hill decent. Just seem to run away a little bit too fast for my liking (approx 5 kph), therefore always had the brake pedal covered. Does anybody else have the same issue?
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ThreadID: 43946 Replies: 9
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AnswerID: 231408   Submitted: Tuesday, Apr 03, 2007 at 11:41

Richard W (NSW) replied:

Pertrol or Diesel?
I don't have any problem with the Diesel.
Awaba
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Reply 1 of 9
FollowupID: 492335   Submitted: Tuesday, Apr 03, 2007 at 12:21

Member - Rob (QLD) posted:

How do you find it in reverse.

Rob
FollowUp 1 of 3
FollowupID: 492340   Submitted: Tuesday, Apr 03, 2007 at 12:37

Richard W (NSW) posted:

Sandhills are usually OK. Anything else needs a dab on the brake every now and then.
Awaba
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FollowupID: 492341   Submitted: Tuesday, Apr 03, 2007 at 12:47

Member - Rob (QLD) posted:

Some as me. As this is my first auto 4WD.

Rob
FollowUp 3 of 3
AnswerID: 231414   Submitted: Tuesday, Apr 03, 2007 at 12:00

Member - Doug T (W.A) replied:






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Reply 2 of 9
AnswerID: 231416   Submitted: Tuesday, Apr 03, 2007 at 12:17

Shawsie (Bris) replied:

Hi White Night, Try 'driving' down the hill by pressing the brake and then using the accelerator for control. Once you get the hang of it you can apply a lot of torque on the descents - it really works.
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Reply 3 of 9
FollowupID: 492379   Submitted: Tuesday, Apr 03, 2007 at 16:13

Truckster (Vic) posted:

What he said works.

IM going back to Auto soon as the box arrives and our wonderful handsome mate who I got it off helps me :)~
FollowUp 1 of 1
AnswerID: 231419   Submitted: Tuesday, Apr 03, 2007 at 12:26

Member - bushfix replied:

g'day,

is it a petrol? what gear/range were you in?

if engine braking is not enough, you can use a technique where you "drive into the brakes", just braking enough with your left foot and gently accelerating. this requires a bit of confidence if you have not done it before and conditions are tricky. you want to keep all four wheels rotating. torque converter keeps going.

also, be aware of the air con. i believe with most vehicles, if the compressor kicks in the engine will rev higher which can catch you out.

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AnswerID: 231427   Submitted: Tuesday, Apr 03, 2007 at 13:38

Des Lexic replied:

Shawsie and Bushfix are correct in what they say. Another option is to apply the hand brake to the point where you can feel it restricting against the drive.
Turn the A/C off and keep your right foot pressed against the side wall to prevent lurching caused by the rough terrain.
Morgan is a great training place isn't it.
When I was doing some training, we had someone else drive our vehicle blindfolded around the quarry area and we had to give them verbal instructions on where to steer. That was interesting.
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Reply 5 of 9
AnswerID: 231436   Submitted: Tuesday, Apr 03, 2007 at 14:35

Member - Doug T (W.A) replied:

MORGAN

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FollowupID: 492380   Submitted: Tuesday, Apr 03, 2007 at 16:13

Truckster (Vic) posted:

FREEMAN
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FollowupID: 493444   Submitted: Tuesday, Apr 10, 2007 at 14:42

Bonz (Vic) posted:

FAIRCHILD

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FollowUp 2 of 2
AnswerID: 231437   Submitted: Tuesday, Apr 03, 2007 at 14:45

Sand Man (SA) replied:


This is a common "problem" with any Automatic transmission.

The only solution is to "ride the brakes" by applying pressure on the brake pedal or as been mentioned, applying the handbrake a little.

The latter technique is handy when desending a slope in slippery conditions, as only the rear of the vehicle is "restricted".

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Reply 7 of 9
FollowupID: 492362   Submitted: Tuesday, Apr 03, 2007 at 15:09

Leroy posted:

that may be the case if the handbrake works off the caliper but what if it's a tail shaft brake like the Patrol?
The best method is to 'drive through the brakes' as mentioned above keeping the engine revs at around 11-1200 rpm to engage the torque converter so to ensure that all wheels are being 'driven' and regulate your speed with the brake. This method can be used with a manual transmission.

Leroy
FollowUp 1 of 3
FollowupID: 492368   Submitted: Tuesday, Apr 03, 2007 at 15:40

Member - Kiwi Kia posted:

Right-on Leroy.

Also some hand brakes are small holding shoes only and definitely not designed to be used while moving. Use the footbrake.
FollowUp 2 of 3
FollowupID: 492557   Submitted: Wednesday, Apr 04, 2007 at 10:34

PhilZD30Patrol posted:

Hi

I regularly use the hand brake on steep declines. I engage the hand brake with the automatic GB locked in low range low gear before commencing the descent and let it off one click at a time until I am travelling at the desired speed.

The hand brake steadies the vehicle on the front and rear axles because the Patrol does not have a centre diff.

The hand brake shoes has not worn out yet. It should be cheap and easy to replace as it is just a matter of dropping the universal joint at the transfer case and removing the brake drum.

Naturally the hand brake get very hot and I sometimes have to stop at the bottom of the hill to allow time for it to cool down.

Using the handbrake is much better then loosing control and the resulting damage to life and to the vehicle.

Cheers
Phil

FollowUp 3 of 3
AnswerID: 231447   Submitted: Tuesday, Apr 03, 2007 at 16:13

White Knight replied:

Thankyou to everyone that responded. Shall give the "driving through the brakes" techique a go. thanks once again. White Knight
Reply 8 of 9
AnswerID: 231469   Submitted: Tuesday, Apr 03, 2007 at 18:07

RobAck replied:

The issue of ascents and descents in auto 4WD is not well understood nor well trained. Two issues are involved, apart from selecting the correct range, which would normally be LOW. As well drive the auto exactly the same way you would a manual and by this I mean using the same gear selection, so 2nd going up hills to reduce wheel slip and 1st going down hill to maximise engine braking.

But auto trans behave differently wth different manufacturers with some holding the selected gear and others continually kicking up or down. But this issue can be driven around with training.

Firstly you need to lock the torque converter into L. To do this select L just before you crest the hill so it is actually driving in that gear before you go down hill. If you make the selection on the way down it will take up to a vehicle length before the converter locks and that can not be a comfortable feeling at all.

Secondly their is a poorly understood technique called brake throttle modulation. Explaining it is difficult and training it is a touch harder but this technique applies to both manuals and auto's for a wide range of driving conditions. But as has been explained the technique relies on gentle pressure on the brake, using the left foot, and driving against that resistance and using enough revs to remain above the torque converters stall point.

Landcruiser 100 5 speed auto and Prado 5 speed auto are virtually the same transmission and the low range reduction in L is very good and well beyond the cotnrol provided by the older 4 speeders.

I know as I train on this stuff all the time and own an auto VX Prado V6 which gets used hard all the time as a training vehicle.

What I do suggest is joining a club and getting some of the training I have described above.

Regards

RobA
Reply 9 of 9