disco concern..o

Submitted: Thursday, Aug 05, 2004 at 21:52
ThreadID: 15331 Views:1921 Replies:3 FollowUps:5
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Anyone had any power problems (hills,towing) with fitting larger tryes to '03 disco td5 auto.

Fitting 245/75/16 (774mm).

Currently has 235/70/16 (734mm).

also any probs with steering stops, rubbing.

currently have about 40mm lift and polyairs.

.....and yes I know it came with a power problem to start with. ":-|

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Reply By: Aston - Friday, Aug 06, 2004 at 03:53

Friday, Aug 06, 2004 at 03:53
John C (QLD)

the following info may help you.

ROVER DISCOVERY TYRE SIZES

235/70-16: Stock tire size.

205/80-16: Stock size in many other countries. Same height as 235/70-16.

255/65-16: same height as stock

225/75-16: little taller than stock

245/70-16: little taller and wider than the stock size. No need for lift, just minor trimming to fit those tires.

245/75-16: popular size for OME suspension lifted vehicles. Require slight trimming on the rear wheel well fender, and may also call for adjustment on the steering bumpstops.

215/85-16: same height as 245/75-16. But narrower. Seems to be preferred for the snow and mud.

265/70-16: about as tall as 245/75-16, but wider. Will require more trimming and steering bump stops adjustments along with taller bump stops over the rear axle.

265/75-16: almost 32" tall. Same as stock NAS D90 tires. Will require even more trimming.

235/85-16: same height as 265/75-16 but narrower. And seems to be the most popular size with OME lift.

255/85-16: about 33" tall...very few people have fitted this size. Lots of butchering for this one.

285/75-16: about 33" also... but very wide.

Use this calculator to demonstrate the effect of the new tyres
link text

Discovery Turning Circle

Just a note to tell you all that ten minutes work can change the poor turning circle on the 2003 model to the same as a tdi. There is a service bulletin from Land rover to all Dealers stating that the 29mm streering lock stops can be changed for 23mm stops, thus improving the turning circle 9 inches for every mm taken off the stops. The change can be done FOC by your dealer
Technical Bulletin 0026 CDS …. ref L8867bu …. & the 23mm lock stops. (manovering in tight spaces)

The Poly Airs will be fine
and dont worry about the power it will do well.

Cheers Aston

AnswerID: 71446

Follow Up By: Member - John C (QLD) - Friday, Aug 06, 2004 at 18:00

Friday, Aug 06, 2004 at 18:00
Thks Aston
big help
Cheers
John
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FollowupID: 331724

Reply By: Member - Chris M (QLD) - Friday, Aug 06, 2004 at 07:49

Friday, Aug 06, 2004 at 07:49
John,

Unless you have boosted the TD5, you will notice a difference. Went from 31's to 33's in a diesel and noticed overtaking/towing were more work.

Cheers

Chris.
AnswerID: 71452

Follow Up By: Member - John C (QLD) - Friday, Aug 06, 2004 at 11:16

Friday, Aug 06, 2004 at 11:16
Chris
Thks for that
That's a pretty big jump though. I'm going from 29" to 30.5".

John
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FollowupID: 331656

Reply By: Member - Bob - Friday, Aug 06, 2004 at 09:17

Friday, Aug 06, 2004 at 09:17
John,
I have the Cooper 245/75/16 STs and polyairs on my 03 auto TD5.
I am convinced this is the ideal tyre for this car.
They fit perfectly on the rear door.
There is no rubbing.
You get an extra 1" lift.
The speedo reads about 100 when you are doing 105.
I have no problems with the altered handling (higher centre of gravity) but you do need to allow for that.
The gearing is longer. Cruising at 100 the tacho is saying about 2000 rpm. Fuel economy is improved. The torque of the engine is sufficient, and the transmission so good that it copes magnificently with the taller final drive ratio.
I fitted these tyres to a spare set of rims with Smartire sensors, but they look and feel so good I am reluctant to put the rims with the Michy's back on, even though I won't be doing a major trip for some time.
AnswerID: 71463

Follow Up By: Member - Bob - Friday, Aug 06, 2004 at 09:44

Friday, Aug 06, 2004 at 09:44
John,
I meant to add that I don't find power/torque a problem, even for towing, but if you do there a range of chips that will boost power from the current 101 kW to 136, 160 or even 200 kW. Torque is similarly improved. The chips cost about $900. Clearly if you boost power you lose reliabilty, but to see the 200 kW Disco take off from the lights like a WRX would be a sight to behold.
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FollowupID: 331651

Follow Up By: Member - John C (QLD) - Friday, Aug 06, 2004 at 17:53

Friday, Aug 06, 2004 at 17:53
Bob

Thks for all the info, much appreciated.

I found out today that fitting the Cooper 245/75/16 ST would be illegal.

Dealer wouldn't take my money!

In Qld I can only go 15mm over existing height, so from 734 to 774 was out of the question.

What is your take on this?

John
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FollowupID: 331720

Follow Up By: Member - Bob - Friday, Aug 06, 2004 at 18:14

Friday, Aug 06, 2004 at 18:14
John,
I believe they are over size and technically illegal. But then so is driving at 105 in a 100 zone. I reckon you'd be pretty stiff to get caught. I was prepared to take the chance.
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FollowupID: 331731

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