Wednesday, Sep 12, 2007 at 07:57
Muddy, the course was very good. No bull bleep , bugger all paperwork - just enough to ensure people have an understanding of a 4wd system. Good instructors.
A couple of scenarios (in all cases you're already in 4wd on firm going, not sand):
You're heading up a
hill, but judge you're not going to make it in the present gear, and trying to change down will likely not work.
Turn the key off, apply the brake.
Decide whether you can make it by keeping going forward. If so;
Keep your foot planted on the brake and; pull on the park brake, stick it in 1st, release park brake, release pedal brake.
By now it's just engine compression holding the show, so release the foot brake slowly to ensure you don't head backwards at a rate of knots.
Give a little bit of accelerator, and start the engine.
(This is the part that freaked me a bit - starting a 14 ton truck, pointing uphill, with all that weight on a starter motor.)
It is a remarkably smooth & efficient method, both starting & stopping.
If you don't think you can make it over the
hill, instead of putting it in 1st, stick it in reverse, turn the jake brake on and start the engine (no accelerator).
Same method is used if pointing down
hill, though it feels much more controlled than regular (clutch on, apply brake) stopping - the engine compression adds braking, so you feel much more comfortable.
The same stopping method can be used in sand, but starting off would be a bit more conventional (start engine, park brake start or whatever the situation dictates) if you're on a slope. If you're on the flat, this 'in-gear' start method can be used.
The theory with the start is, for the instant you start the engine drive is sent to all wheels, giving better traction to get the vehicle moving. Of course, very quickly the diffs do their job, but by then you're already moving. Also, because you start at low revs, low speed, it's a smoother start - no rocking back on the rear axle.
Give it a try.
I understand this method is being taught with Izuzu & Hino approval (after all, the CFS is not going to teach anything which increases likelyhood of buggering the vehicles or voiding warranties), it is taught by industry experts (the guy who taught me was in the army for quite some time as a driver, trainer, experimenter) who also teach it in regular 4wd training courses.
Most importantly though, having done it, it feels very comfortable & useable.
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