Hypermileing

[SimonP38a]

I have been looking at Hypermileing on the web, that is, driving in a manner to get the highest MPG (kPL?). They suggest putting the car in neutral going down hill, or when coasting along the flat.

Can anyone tell me if this will this damage the gearbox of a P38a?

Simon

[brenno]

I'm not sure of damage to the gearbox....

But it's a great way to do things if you do NOT want to be in complete control of your vehicle. I wouldn't recommend doing it personally.

[Blknight.aus]

I should tell you that this will completely destroy every part of the driveline downstream of the sparkplugs just on the basis of it will stop you doing it from a safety stand point.

in reality it might increase the wear on the box bearings as the pump in the box wont be spinning fast enough to supply lube pressure.

[123rover50]

We used to do this as kids in the 60,s.

"Angel gear"

[p38arover]

I have been looking at Hypermileing on the web, that is, driving in a manner to get the highest MPG (kPL?).

L/100 km is the correct format these days.

[Keithy P38]

There are other ways to get better mileage in a P38! Simply leave it at home and take the push bike!!

It's inevitable that your driving a 2.25 tonne 4.0/4.6 litre V8 engined vehicle that is a full-time 4x4! Another option that i've heard of but not seen is to fit free-wheeling front hubs and turn it into a part-time 4x4! I rekon there would be at least 1l/100km saving in it, although the cost to convert would be more than the first few years of petrol savings!

Cheers
Keithy

[p38arover]

I don't worry about fuel consumption. It's the cheapest part of ownership.

[PhilipA]

They suggest putting the car in neutral going down hill, or when coasting along the flat.



What a crock!!!! This used to work with carburettor cars but I hope you are aware that about 100% of injected cars cut off all fuel when the car is running down a hill with foot off the accelerator.
In fact on the Prius hypermiling site they de facto recommend what I say below. They speed up , then let the speed decay, then speed up etc etc . Must annoy the hell out of other drivers

I once posted this on another forum and was argued with by a luddite , who said "impossible, the computer doesn't know you are going down a hill"
Its very simple
Revs => 1500RPM
VSS =>speed pulse
TPS = idle /closed

However you must be aware in your driving style.
You MUST take your foot off the accelerator FULLY when going down a hill.
If this means that you occasionally have to give it a bit to maintain speed you do so.
In the city change down to third when going down hills,as this raises the revs to over 1500.
I f you look at your fuel consumption indicator , you can see it happening. In my Jazz I can pick up significant fuel economy by doing this. Dunno what my savings are on my old Classic but I do it as a matter of course.
Regards Philip A
BTW , the point is that when in neutral idling the engine is using fuel , while overriding, no fuel is used. Now if you turned off on every hill that may work, but let me know if you try it so I can avoid the accident.

[big guy]

Angel gear Hey?
If you are out of gear and coasting you are also out of control.
Why would anyone do that? To save a few cents and to risk own life(which is fine) but to endanger others thats is not fine!

Just read the traffic a bit further in advance.
If you can see them slowing, take the foot off the loud pedal and accelerate smoothly etc.

A old tech V8 or any V8 will never be economical but as said before, in a Landy the fuel is the least of your cost.:cool:

[Scouse]

In my experience with P38 Range Rovers, they generally get excellent fuel mileage.











Mind you, the tilt tray that they're riding on doesn't get it so good.

[Scouse]

in a Landy the fuel is the least of your cost.I can't say that about either of my Range Rovers.



Not that I'm complaining about that fact though :D.

[p38arover]

In my experience with P38 Range Rovers, they generally get excellent fuel mileage.











Mind you, the tilt tray that they're riding on doesn't get it so good.

Personal experience? :p

[Scouse]

Personal experience? :pI refuse to answer that question on the grounds it may incriminate me.

[Blknight.aus]

or ron will pick apart the spelling and grammar.

[WasabiPimpNinja]

From what I've read so far on the ZF 4HP22/24 gearbox's, they have a problem with bleeding oil pressure. They say you should never rev your car in neutral or park after you have engaged a gear. This will kill your box. I'm guessing that this is mainly if you're actually on the throttle (emissions testing @ 2000rpm) and not idling, which you wouldn't be in this case, but either way I wouldn't want to risk it. Having just had to order a replacement box from the UK, it's not something I would want anyone else to go through.

Oh, and it's bloody dangerous.

Cheers,
Keels.

[PhilipA]

AFAIK they fixed that in about 1988 or so, as soon as the US emissions testers had blown up a few BMWs .
They drilled relief holes in the first clutch set or whatever.
I guess if you had an earlier one still untouched then it could be a problem.
Regards Philip A