Disco 2 Upgrading the brakes

Muppetdaze · Mar 20, 2018

(So IF i can find a set of et30 modulars in 16,) I will need to upgrade the brakes to go with the huge tyres
Any recommendations if anyone knows of any better calipers or pads that will fit standard ? tyres are 34 inchers
or the best solid discs, all original TD5 atmo,

dieseldog69 · Mar 20, 2018

Do you mean et30 or et-30?

Minus 30 sounds right on for your tyres.

I'd worry more about the cost implications of sacrificing wheel bearings on those rims than the brakes

Muppetdaze · Mar 20, 2018

well i am using https://tiresize.com/wheel-offset-calculator/ to hopefully get the right size, unless they have them reversed, I have to allow for steering movement too,
I must admit that wheel bearings isn't something i'd thought about,

Toseland · Mar 20, 2018

https://www.jgs4x4.co.uk/discovery/discovery-2/brakes/?sort=pricedesc a good set of discs and pads should be enough,

discool · Mar 20, 2018

Muppetdaze said:
(So IF i can find a set of et30 modulars in 16,) I will need to upgrade the brakes to go with the huge tyres

Why do u need upgraded brakes, the vehicles performance won't increase, at will it.

Muppetdaze · Mar 20, 2018

simple principle of leverage, bigger the diameter, more force from the road onto the brakes

bankz5152 · Mar 20, 2018

Ive 33s on mine still stops fine.

New quality pads all round
New fluid
Vented discs would be decent but you need new calipers too

Check your calipers are infact in tip top shape, mine where not and have all been replaced.

Afaik only Bowler do a brake upgrade kit that suit 16s and they are £2.5k.

Want more you need 6 pots and 18s which run at £3k+

discool · Mar 20, 2018

Muppetdaze said:
simple principle of leverage, bigger the diameter, more force from the road onto the brakes

I understand that, but a disco with large tyres won't be taking bends at 70 80 mph or even braking from those speeds.

Muppetdaze · Mar 22, 2018

To stop you rolling up or down a steep incline, also I will be towing at times too, hmm okay gonna have to monster a caravan for fun too.
Off road caravanning!
Potential new sport in the making,

dieseldog69 · Mar 22, 2018

Muppetdaze said:
well i am using https://tiresize.com/wheel-offset-calculator/ to hopefully get the right size, unless they have them reversed, I have to allow for steering movement too,
I must admit that wheel bearings isn't something i'd thought about,

This is what I came up with as a means of pushing the wheel further out to enable you to still maintain a sensible turning circle on a larger diameter tyre.

screencapture-tiresize-wheel-offset-calculator-2018-03-22-21_51_59.png

Muppetdaze · Mar 24, 2018

current offset is 57 i think, now going to play with options.

sierrafery · Mar 24, 2018

With those tyres the whole engine management and ABS system will be mixed up anyway as the VSS is seriously altered.... reinforcing the braking power might not help much cos you might just push hard a pulsing pedal while the ABS and EBD are kicking in... to not speak about the EGT, the Td5 D2 was simply not built for such tyres unless you invest in expensive power, cooling and driveline tuning... i know that from my own experience with ECT and EGT gauges on the dash

Muppetdaze · Mar 24, 2018

Ahh thankyou Sierrafery, so what would the largest tyres you'd recommend? 33's 32's?

sierrafery · Mar 24, 2018

I dont recommend largest tyres at all but IMO anything above 5% difference in diameter is root of trouble, here's the whole story: https://www.landyzone.co.uk/land-rover/255-65-or-255-70-pros-and-cons.292220/#post-3620824 ... read untill post #7... of course that you can addapt the vehicle's management, cooling and drivetrain for huge tyres but at high costs... anyway if you want to go with such big tyres at least fit additional EGT and ECT gauges at least when you'll see them up in the sky to ease the throttle

dieseldog69 · Mar 24, 2018

sierrafery said:
I dont recommend largest tyres at all but IMO anything above 5% difference in diameter is root of trouble, here's the whole story: https://www.landyzone.co.uk/land-rover/255-65-or-255-70-pros-and-cons.292220/#post-3620824 ... read untill post #7... of course that you can addapt the vehicle's management, cooling and drivetrain for huge tyres but at high costs... anyway if you want to go with such big tyres at least fit additional EGT and ECT gauges at least when you'll see them up in the sky to ease the throttle

Depends on your budget.

You can fit huge tyres as long as you alter the diff gearing to suit and bring it all back in line.

For example.

34 inch tyres will be about 16% increase in diameter

Standard tyre and gearing

screencapture-ashcroft-transmissions-co-uk-calc-ratio_calc29inchtyres.png

34 inch tyre standard gearing

ashcroft-transmissions-co-uk-calc-ratio_34inchtyres.png

34 inch tyre with a 4.37 ring and pinion

screencapture-ashcroft-transmissions-co-uk-calc-ratio_calc-34inchtyre4.37ringandpinion.png

Notice how the ring and pinion alter the gearing and bring it all back to normal, well, normal~ish, 4.37 was closest I found using Ashcrofts ratio calculator as the 4.7 was too low geared and the 4.1 was still too high.

Muppetdaze · Mar 24, 2018

Does the final drive affect the VSS and ABS though? I was asking about a 4.1 in another post

Muppetdaze · Mar 24, 2018

Oops, better mention mines an auto.

Disco 2 Upgrading the brakes

Muppetdaze

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dieseldog69

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Muppetdaze

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Toseland

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discool

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bankz5152

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