Thread: Please read: Posts on 19" rims

Hi rmp, sorry to go over old ground again, but Gordon is right with the 0 - 100 Kph figures for the 200 LC. It is actually a full second slower than the 3.0Lt D4.
Toyota Australia are dreamin

These days, most of the clients we take out on training have 19" rims fitted to their cars. Usually 255/55/19 or 255/50/19. On beach/sand dunes we tell them to drop the pressure to 16psi. Note the sand is fairly soft, on harder-packed surfaces you could leave them at 20psi. Obviously you need to be aware of sudden changes in direction such as hard cornering at speed, and negotiate rock outcroppings carefully (drive over rocks rather than scrape past them).

Other than that, these tyres at lower pressure will give you plenty of flotation - they extend their footprint in sand just as readily as 18" tyres. And the D4 3.0 ltr will have more than enough power to keep out out of trouble.

Cheers,

Gordon

Originally Posted by Celtoid

OK guys,

Getting back to the topic of 19" Rims and trying not to start another 'size war'......

I'm off to Fraser Island in a few weeks with a stock standard D4 SE 3.0TD. I'm running the standard 19" Rims with the Goodyear Wrangler tyres that the car came with.

I'm a tad confused with all the toe'ing and fro'ing over the tyres. I'm anticipating soft and hard sand work....what am I doing with my tyres?

Had I never read any of the threads on this topic I would have assumed I'd drop pressure whilst on the sand but I'd be asking to what pressure?....now that I have read the various opinions, not quite sure what to do. The car will be full of people and stuff but no trailer as we are staying at a house. Now I'm not so sure of the benefits of dropping pressure on a lower profile tyre.

Can somebody with real experience on this topic i.e. who has used tyres this size, clear this up for me please?

Drop pressure YES/NO?

What pressure to, if yes?

Thanks.

Regards,

Celtoid.

Originally Posted by rmp

I agree, but seeing as the subject came up we may as well discuss it.

OK, I'll let the people at Toyota know they're dreamin'.

I think it's a bit optimistic myself, but that's the figure they quote and my own experience is that the 200 is lineball with the best LR diesels for straight-line grunt. But I'm repeating myself again....

Toyota LC 200
Toyota 200 Series LandCruiser - www.drive.com.au

Price


From $69,990.

Engine Size/Type


4.5-litre, direct-injection, twin-turbo, diesel V8.

Power


195kW at 3400rpm.

Torque


650Nm from 1600-2600rpm.

Brakes


Discs with anti-lock and stability control.

0-100km/h


10.5 seconds.

Land Rover D4 TDv6
The New Discovery 4 10MY | Land Rover Australia

Responsive 500Nm Torque from idle in 500ms, delivers immediate throttle response and effortless cruising ability (0-100 km/h in 9.6 seconds, 24% improvement)

Re the 200 -- Toyota specs and they didn't say which country it applied to nor did I ask. I know there are differences between country spec levels and tune, and not only that there should be slightly different figures for trim levels too given there are weight differences. 8.2 does seem too fast and I agree 10 feels more logically nearer the mark, but there's a big gap between the 8.2 and 10.5 which has to be more than just spec difference. I would expect the D4 to win on paper as it has the better gearing for acceleration, a lower sixth gear.

I will say that you can't always trust manufacturer figures on a website or from anywhere else, very often you get different answers to the same question from different yet "official" sources. Have LRA confirmed the figures for the D4 are for AU cars in AU? Just because an Australian operation quotes a figure doesn't mean to say they have re-run a test with the AU spec model using AU spec fuel -- they do for fuel consumption and to get ANCAP test results, but for non-regulated figures like 0-100...doubt it especially for 4WDs. So, any figure like this is open to intepretation unless it's for a general idea.

I don't know what circumstances the mag tests were done in so won't comment. I'm not saying they're wrong by any means, maybe their test was such that the D4 won that contest, I only did roll-ons with a Vogue which has a slightly more powerful engine than the 3.0. I've explained my personal experience which was hardly scientific but would have shown up any major differences, and note that in these things context is everything (and I have no context for the mag tests referred to), so that's where I'll leave it and am unlikely to investigate it further given it's not a major buying consideration. I might speculate and say that the Toyota is certainly slower-revving so off the line would be slower and wouldn't be able to catch up. This is less of a problem with roll-ons. The end speed is also a factor, maybe they went to 80...100...150! A given vehicle could win one sector and lose another. In the real world, IMHO, there's not very much difference in straight-line grunt.

19s and low pressure -- x2 to Tombie and Gordon.

Celtoid - ok there's a whole other discussion about torque, drag, gearing etc about why a dirtbike accelerates quickly but doesn't have a high top speed, but that's a Technical or Campfire topic. The case of say a Lotus Elise and a heavy grand tourer like a Jag XK is another contrast. You're quite right but my point was about roadcars of the same type, different engines. And I agree we're on the same page here!

Originally Posted by rmp

I would expect the D4 to win on paper as it has the better gearing for acceleration, a lower sixth gear.

6th gear wouldn't get a look-in up to 100 kph - it probably only needs 3rd!

Originally Posted by gghaggis

These days, most of the clients we take out on training have 19" rims fitted to their cars. Usually 255/55/19 or 255/50/19. On beach/sand dunes we tell them to drop the pressure to 16psi. Note the sand is fairly soft, on harder-packed surfaces you could leave them at 20psi. Obviously you need to be aware of sudden changes in direction such as hard cornering at speed, and negotiate rock outcroppings carefully (drive over rocks rather than scrape past them).

Other than that, these tyres at lower pressure will give you plenty of flotation - they extend their footprint in sand just as readily as 18" tyres. And the D4 3.0 ltr will have more than enough power to keep out out of trouble.

Cheers,

Gordon

Cheers Gordon, that's the sort of specifics I was looking for.

I realise that you are in Perth and may not know where to buy here in Brisbane but can you make a compressor recommendation?

Also, what's your thoughts on the 'track' style anti-bogging device...the plastic mat things that you stick under your tyres?

Regards,

Kev

Originally Posted by Graeme

6th gear wouldn't get a look-in up to 100 kph - it probably only needs 3rd!

True, I wasn't very clear...I was referring to the closer ratios by virtue of the lower top. Probably both are in third at 100 but I suspect the 200 wouldn't be as close to its 4th gear as the D4. Conversely, the 200 probably has a higher top speed thanks to the taller gear and mountain of torque (and yes I know there are many other factors!)

Originally Posted by rmp

and yes I know there are many other factors!

.. such as the D4's speed limiter.