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45deg (100%) is very steep!

Posted: Tue Oct 19, 2010 8:02 am
by 4ePajero
VW claims that the Touareg can climb a 45deg incline. That's 100% (1m up for every 1m forward).

I don't know what other SUVs can climb, but the videos in this thread gives an indication of how steep it actually is!

What's the steepest incline you have tried?

What I hate about these climbs is that one cannot see the 'road' in front of the vehicle.

Re: 100% (45 deg) incline is very steep!

Posted: Tue Oct 19, 2010 8:40 am
by KaiV
Hmmm, the video still does not give the 45° slope any justice. My question is "WHY"???

I just feel its damn dangerous. M2CW. As the write up says, the steps make for bad traction on our type of tires where as a trucks tires will offer much more grip.

I have doen the 35° going up and down at Gerotech. That was scary enough and I suppose its been there and got the Tshirt. I wont do it again. I was there in my Colt.

Attached pic show all the inclines available. 45°, 35°, 27° and 22° (with a chicken run)

Re: 100% (45 deg) incline is very steep!

Posted: Tue Oct 19, 2010 9:08 am
by SimonB
Sorry, I wont do it... (unless under highly controlled conditions). Very rarely is traction good enough to do that kind of slope. I believe the Pajero's can do it, but unfortunately we drive on roads and worse... not paper. I think my steepest slope has been around 30 degrees. if my inclinometer and the wife's complaining was anything to go by.

Re: 100% (45 deg) incline is very steep!

Posted: Tue Oct 19, 2010 9:14 am
by 4ePikanini
How high is the risk to do a backflip?

what other than that is the risk of doing a steep incline on a non-bumpy slope?

My biggest fear is oil starvation in the pajero.

Re: 100% (45 deg) incline is very steep!

Posted: Tue Oct 19, 2010 9:25 am
by SimonB
4ePikanini wrote:How high is the risk to do a backflip?

what other than that is the risk of doing a steep incline on a non-bumpy slope?
I wouldn't worry about the backflip as most of the weight is in the front anyway, but for me the biggest risk is any possibility of loss of traction. No surface is really perfect, and you just have to edge a smidgen sideways and you're in big trouble.

I know a hole was involved but remember that Aussie Gen3 that rolled?

Re: 100% (45 deg) incline is very steep!

Posted: Tue Oct 19, 2010 10:12 am
by KaiV
Risk of backflip is possibly zero unless you start bouncing infront. With CDL one might get enough power onto the back wheels to flip... M2CW.

One isnt allowed to drive down that one...

I doubt one will go sideways, as the incline s pretty "horizontal". The side railing is high and one needs to judge from that. The guy who took us on the course there told us what std 4x4's have been up there, but cannot remember if a Paj has gone up there.

I know of a Cruiser thats been up.

We werent allowed to even try. The real problem is that if one doesnt make it (apart from mechanical failiure and seriaaas stresses) is the reversing back down. One only has one chance.

Risk worth reward? I doubt it. Leave it for the OEM's and crazy people ;)

Re: 100% (45 deg) incline is very steep!

Posted: Tue Oct 19, 2010 10:18 am
by 4ePikanini
I know I will be too scared to try.

Is there a danger from taking a bit of a runup and using more entry speed or is the approach too steep and the suspension will bottom out?

Re: 100% (45 deg) incline is very steep!

Posted: Tue Oct 19, 2010 2:26 pm
by 4ePajero
KaiV wrote:My question is "WHY"???
I suppose for one of the following reasons:
  • the same reason as to why we attempt obstacles on a trail, even if a "chicken run" is available :D
  • bragging rights
  • testosterone ;)
I think the only real danger is losing direction when you reverse it back. The rails should keep you from flipping over though!

4ePikanini wrote:My biggest fear is oil starvation in the pajero.
Interesting point.

(you will enjoy this bit of technical wizardry)
This is how VW solves the 'problem' of oil starvation on the V10 TDi engine.

The oil pumps:
Oil Pumps.jpg
Functioning of the oil scavenging
system in different driving states
In order to ensure functioning of the compressed
oil system, with the correct filling level in all
driving states, two oil scavenge pumps are used.
The following examples describe the oil
scavenge system in three different driving states.
During normal (level) driving:
Normal.jpg
During downhill driving:
Downhill.jpg
During uphill driving:
Uphill.jpg

Re: 100% (45 deg) incline is very steep!

Posted: Tue Oct 19, 2010 2:42 pm
by KaiV
Come now 4e, how would the Paj do at 45°, engine wise I mean ;)

Interesting reading though, thanks

Re: 100% (45 deg) incline is very steep!

Posted: Tue Oct 19, 2010 3:13 pm
by 4ePajero
KaiV wrote:Come now 4e, how would the Paj do at 45°, engine wise I mean ;)
I think my Pajero will do it with the tyres deflated to 0.5 bar.
The Di-D has more grunt than the VW 3.0 V6 Tdi.

To me the real test would be not to storm it, but to crawl up it.
(with enough speed and somewhere to land at the top, anything can do it).

I will most probably never know, because I don't go to Gauteng apart from cases of extreme provocation.
Furthermore I have no aspirations to prove anything. That is for owners of the lesser brands. :twisted:

I must say that I would be concerned about
  • clutch failure
  • oil starvation
  • stripping a diff (33" tyres at 0.5 bar give enough traction to break most diffs)
The Pajero has a claimed climbing angle of 35deg, and I think that limit is set not by traction but by oil sump geometry.