Anyone running 4.11's?

[Jazzman]

What are 4.11's like on 32's and on standard 29" with AUTO. Ashcroft's ratio calculator suggests it is only 360 RPM different in high range at 100 kph. Is that a lot?

What RPM are you sitting at at 100 kph and what tire size are you running?

[Werdenfelser]

What RPM are you sitting at at 100 kph and what tire size are you running?


32" here (265/75), stock Diffs, Auto, 2000 RPM. Perfect for long rides.
Fuel consumption is down to 10 - 11l/100km. Last 600km ride 9.6. :-)
But it works only with enough ooomph... Dont want to test it with stock engine.
Climbing and towing now with some mods is okay but could be better..
I think about to change to 3.8. Maybe the better compromise about travelspeed and climbingpower.
4.11 is took short i think. Good for climbing but too much revs at travelin.

[Fluids]

265/70 * 16 - 30.5" - 5.7% oversize

Std driveline + auto

80kmhr - 1775-1800rpm
90kmhr - 1980-2000rpm
100kmhr - 2150-2175rpm

With std tune, egr + cat gone, and boost at around 19psi max.

Works well but a few extra ponies would be nice when towing the Kamper. Really needs a bit more boost at the lower revs ... VNT is the likley solution. I can't imagine how bad it would be towing with 265/75 * 16 on the current tune ... went from 255/70 * 16 which were good, to the 276/70 * 16 which imho makes it just a tad too flat on the std tune ... engine revs not quite high enough ... so maybe adding a few more ponies helps overcome that.

[discorevy]

Give it a tune kev..........you'll wish you did it ages ago

[loanrangie]

With 4.11's you will want to run at least a 33" tyre or it will scream it's tits off on the highway.

[mrapocalypse]

Get the tyres first then see how you go.

265/75/16 on mine and standard gearing it lopes along at 110k at 2100 rpm.

V8 but.

Nice.

[Disco Muppet]

If you want go regear for 32s, Ashcroft do a 3.75 cw/p, or GBR Utah do a 3.9 CWP.
Ashcroft for the auto and GBR for manuals imho, 4.11s are better for 33s.

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[d2dave]

I am running 4.11's with 32's and I don't find it is revving exceedingly high.

[Werdenfelser]

How much revs do you have at 100km/h? Auto or manual?
Could you Plesse tell me your Fuel consumption with your setup? Thank you!

[d2dave]

It's an auto. As for fuel consumption, I have no idea.
I just put fuel in it and drive it.

Next time I drive it I will make a note of the RPM.

[d2dave]

Just took it for a run. 100Kph = 2511 RPM

[Disco Muppet]

Too high...

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[d2dave]

For you it might be, but I am happy with it, which is what matters.

[Disco Muppet]

True, whatever floats your boat.


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[Werdenfelser]

Thank you!
Always good to see practical experiences and not only theretical calculations.

But would be to high for me too.

[d2dave]

Thank you!
Always good to see practical experiences and not only theretical calculations.

But would be to high for me too.

Pardon my dumbness, but what is a theretical calculation?

[rangieman]

Id like to know why some think 2500 rpm at 100 k is too much:confused:

[d2dave]

Id like to know why some think 2500 rpm at 100 k is too much:confused:

I would reckon that they have never owned a car back in the 70's that only had transmissions that were 1:1 in top gear.

And if it was an auto, convertor lock up was a dream

[CU55TM Disco]

I've been wondering this for a while now, so thanks to the OP for starting this thread.

I've always found in both my d1 and d2 that just under 2500rpm seems to be the sweet spot, it must be right on, or very close to peak torque of the engine as it just seems unstoppable! Admittedly, with the 265/75's it's almost 120kph so there's a it of a risk attached to it.

I don't like the idea of changing gearing to 3.75 or similar and then deciding down the track that I want to goto 255s or 285s (33 equiv) so I've been hoping that 411s would be bearable with the 32s as I'd prefer to gear first, and then up the tyre size, I feel that any bigger than 32 on stock gears would make the truck a right PITA to drive on or off road.

Current setup is boost @ Aprox 18psi, decat, de egr, 265/75 and lifted. Once u added on barwork etc it would be a slug on any bigger tyre I reckon.

In response to 2500rpm being too much, keep in mind that it is only 2.5L so not a huge engine, as a comparison my 2.6 petrol bravo does 3100 @ 110, so the revs aren't that high for the td5s capacity.

[rangieman]

I've been wondering this for a while now, so thanks to the OP for starting this thread.

I've always found in both my d1 and d2 that just under 2500rpm seems to be the sweet spot, it must be right on, or very close to peak torque of the engine as it just seems unstoppable! Admittedly, with the 265/75's it's almost 120kph so there's a it of a risk attached to it.

I don't like the idea of changing gearing to 3.75 or similar and then deciding down the track that I want to goto 255s or 285s (33 equiv) so I've been hoping that 411s would be bearable with the 32s as I'd prefer to gear first, and then up the tyre size, I feel that any bigger than 32 on stock gears would make the truck a right PITA to drive on or off road.

Current setup is boost @ Aprox 18psi, decat, de egr, 265/75 and lifted. Once u added on barwork etc it would be a slug on any bigger tyre I reckon.

In response to 2500rpm being too much, keep in mind that it is only 2.5L so not a huge engine, as a comparison my 2.6 petrol bravo does 3100 @ 110, so the revs aren't that high for the td5s capacity.
My thoughts exactly :thumbsup:.

[Fluids]

Id like to know why some think 2500 rpm at 100 k is too much:confused:

Isn't that around Td5 Defender rpm's for 100km/hr ... or maybe as high as 2650-2750rpm ??

I know I'm doing 2840rpm or so at 130 :twisted:
2150 or so for 100 ... very relaxed.

I think std D2 rpm with std tyres is around 2300 ... 2500 aint that much more ... It should pull away very well when the boot's applied with the torque converter locked up ! :cool:

Best torque on a std tune engine is 1800 - 2200rpm

[Disco Muppet]

Id like to know why some think 2500 rpm at 100 k is too much:confused:

For the same reason that some people don't think its a problem, personal preference.
I spend my time at work in vehicles that are low geared and rarely do I see under 25-2600rpm, and it irritates me.
So when I get in my car, I like to cruise quietly at the legal speed limit :cool:
And you know plenty of Land Rover transmissions have 1:1 top gear, driven a few of those :angel:
My original reply was a little short, granted, but my ones at work tend to be :angel:

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[rangieman]

Isn't that around Td5 Defender rpm's for 100km/hr ... or maybe as high as 2650-2750rpm ??

I know I'm doing 2840rpm or so at 130 :twisted:
2150 or so for 100 ... very relaxed.

I think std D2 rpm with std tyres is around 2300 ... 2500 aint that much more ... It should pull away very well when the boot's applied with the torque converter locked up ! :cool:

Best torque on a std tune engine is 1800 - 2200rpm

Just checked mine at 100 k standard 29 " tyres 2400 rpm so 2500 at a 100 is not far off the mark:cool:
Yes the Tdi and Td5 Deefer`s revs would be higher on standard gearing they also dont have a tacho fitted standard . So unless someone that has retro fitted a tacho to a earlier deefer can chime in ;)
I have owned a Tdi and Td5 Deefer with standard gearing and they both sat on a 100 k plus no probs and both with roof racks still returned 100k to 10 ltr`s consistently :p
Can the doubters fess up what their gripe is :confused:

[rangieman]

For the same reason that some people don't think its a problem, personal preference.
I spend my time at work in vehicles that are low geared and rarely do I see under 25-2600rpm, and it irritates me.
So when I get in my car, I like to cruise quietly at the legal speed limit :cool:
And you know plenty of Land Rover transmissions have 1:1 top gear, driven a few of those :angel:
My original reply was a little short, granted, but my ones at work tend to be :angel:

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Come on mate you drive those noisey tojo junkers which would be noisier than a D2 at the same revs:p

[Disco Muppet]

Depends which way the wind blows :p
And the new V8s aren't that bad.

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[CU55TM Disco]

Yeah but they ain't that good either! Lol

[CU55TM Disco]

What about changing to defender xfer case? What's that make ur highway revs? That's an alternative to diff gears.

[d2dave]

I spend my time at work in vehicles that are low geared and rarely do I see under 25-2600rpm, and it irritates me.


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Get a job like mine. 1600 RPM at 100 kph:)

[Disco Muppet]

The work utes make me appreciate my D2 on the days I'm annoyed with it :P
Besides, I get to go places like this...
Best job ever :D

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[Werdenfelser]

Pardon my dumbness, but what is a theretical calculation?

Not your dumbness! My poor Krautenglish and stupid Mobile Internet.
I mean theoretic calculation. On Ratio Calculators like on Ashcroft. It is nice to see but i prefer real experiences. Hope it is clear now. :D

[bn172]

Gday one and all, I am running a td5 d2 with 3.9 GBR gears and 235/85/16s. Rpm at 100kph is 2250, which is same as 3.9 on std tyres. I have done just on 100k on these and find them to be spot on. Engine has a davis chip in it and no egr or center muffler. I find the biggest advantage when in low range as it holds down hills much better than when it had std gearing and 32" tyres. I'm averaging about 11 lt per 100ks, car has bbar winch, rear locker,2 inch lift also, hope this helps. Cheers Ben.