Thread: Anti-stall question...

It works simply on revs....has nothing to do with what gear it's in on the td5.....or whether its in high or low range..........

Ok, so on that basis mine won't stall when I try and set off in 5 th high then?

Betcha it will!

Originally Posted by Naks

Not always Lou.

The Cape LR club did a trail recently where the exit goes through a steep downhill section with very loose & flat-ish small rocks. In that instance, 1st low was too slow, with the vehicles sliding as the rocks moved around. 2nd low was too fast. In the end we all did it 'hopping' 0.5m at a time

Hi Naks,

Yeh agree with you that surfaces differ drastically and you can't over generalise. Shale as you described it is nasty in most cases as they slide amongst themselves and take the wheels with them.

Works a treat though on most surfaces like clayey mud, sand and rocks. I climbed down a boulder spill (like a rock slide) up in Pilbara with boulders in the 300mm to 500mm range and the 90 just carefully stepped down them one at a time (did scrape the rock sliders acouple times though!).

BTW where were you guys? - My first 90 in 1996 was from Forsdicks in Bellville...

Cheers,

Lou

Originally Posted by Loubrey

BTW where were you guys? - My first 90 in 1996 was from Forsdicks in Bellville...

Yeah, tricky stuff that shale!

We're in the Helderberg, currently in Gordon's Bay and moving to Stellenbosch in a couple of weeks.

I used to be a paid up member of the CLROC and LROCSA until I went to Central Africa in 1999.

I miss the Cape, especially when I see you photo posts! I had a place in Milnerton Ridge (Stable View), but most of my mates where from the northern suburbs through to Stellenbosch...

Cheers,

Lou

Originally Posted by camel_landy

No, that's utter twaddle...

If the ECU detects the car is in Low-1st, the idle speed is deliberately raised to 1000rpm. This is called the 'Idle Jack' and nothing to do with 'Anti-Stall'. As stated before ALL EFi systems have an element of anti-stall...

The reason for this is that 1st-Low is soooo low, it actually increased the risk of the car sliding on a very steep slope. The idle speed is raised a touch, to help reduce this risk.

M

OK this is what I found and they describe this as the engine compression limitation
https://www.youtube.com/watch?v=PMhOhT5nwZk

Cheers

Originally Posted by mools

Ok, so on that basis mine won't stall when I try and set off in 5 th high then?

Betcha it will!

If you ride the clutch long enough it will.......

Originally Posted by ProjectDirector

OK this is what I found and they describe this as the engine compression limitation
https://www.youtube.com/watch?v=PMhOhT5nwZk

Cheers

I don't think that skipping down the hill was due to the idle RPM's, I think it's more to do with the open diffs, and the traction being lost. If you have open diffs and you lose the grip on one wheel of the axle - then you lose ALL engine breaking on that axle. But the LC with diff locks mean that you can lose traction in one wheel on one axle but the other wheel with grip will still have engine braking. Traction control won't work in this situation.

In my advanced driver training in the old Rangie we were taught a technique for driving throught the brakes on an automatic gearbox to increase traction, I think that might help in this situation as it would provide some braking to the wheels that still have traction.

Originally Posted by mools

Ok, so on that basis mine won't stall when I try and set off in 5 th high then?

Betcha it will!

There will be limits into how much fuel/power it can give the engine to keep the idle speed at the correct rpm. Given it's at idle you'd perhaps have 20% of max power even with it at maximum fueling, due to turbo boost etc not being there. So yes there will be limits into just how much power you can take from the engine at idle before it just stalls.