Sag correction after fitting winch and bull bar

[B92 8NW]

I have installed a bullbar, winch and second battery to my Disco which has caused a bad nose down attitude.

Hub to guard measurements are:
Rear - 550 mm
Front - 490 mm

The springs all round are 45mm raised Dobinsons - the front spring part number is C51-018 but I can't seem to find what the spring rate is.

How do I know which spring rates are needed to correct this? (Bearing in mind I don't know the rate of the current springs.)

[Vern]

contact dobinsons:p

[B92 8NW]

contact dobinsons:p

Must be the altitude:angel:

All I managed to juice out of them was that a C51-018 is "EXTRA HEAVY DUTY RAISED", that is to say, its the highest rate they make:(.

[justinc]

I have installed a bullbar, winch and second battery to my Disco which has caused a bad nose down attitude.

Hub to guard measurements are:
Rear - 550 mm
Front - 490 mm

The springs all round are 45mm raised Dobinsons - the front spring part number is C51-018 but I can't seem to find what the spring rate is.

How do I know which spring rates are needed to correct this? (Bearing in mind I don't know the rate of the current springs.)

The front measurements are only 20mm above standard, By my reckoning the rear is about a 80mm lift Standard measurements are 470mm.

Maybe a complete rethink now that the bar and winch is fitted?

I advise people to sometimes wait until winch etc etc is fitted before selecting spring and shock combinations.

LRA have some good rates, I'll take a look at my listings and post a few ideas, BTW, what winch and bar?

JC

[justinc]

After taking a squiz at the listings, I would try a pair of Pink (15.9" free length and 180psi) or Red (16.5" free length and also 180 psi) springs from LRA, but I need to know approx winch and bar weight please, and current bump stop clearance.

JC

[B92 8NW]

Thanks JC, so standard is 470mm? Jesus! 80mm lift? No wonder the roofline is well above my head at 6ft!

The bar is a steel ARB winch bar, not sure of weight, buts its the non airbag one with the reinforcing at the front where the fairlead goes.

The winch weighs 38 kgs with Dyneema rope. Not sure of bumpstop clearance, shall measure.

[nice1guv]

Could the front sag also be partially due to the springs you have in the back?
If you have rear springs that are stiff to handle loading, then when you load them up will it be nearly level?

I've just found these measurement posts for the D1:
http://www.aulro.com/afvb/discovery-1/86338-hub-wheel-arch-distances-measuring-lift.html
http://www.aulro.com/afvb/90-110-130-defender-county/81711-bump-stop-clearances-rim-hub-guard-measurements-2.html#post1003140

It appears from these posts that the D1 is 460mm front and 490mm rear.

[Vern]

After taking a squiz at the listings, I would try a pair of Pink (15.9" free length and 180psi) or Red (16.5" free length and also 180 psi) springs from LRA, but I need to know approx winch and bar weight please, and current bump stop clearance.

JC
We have the reds in our D1, it runs a winch bar and duel batteries, no winch though, can measure it tomorrow for you B92.
From memory it sits higher than yours when you popped in, but you may have changed springs now?

[B92 8NW]

Thanks Damien, that'd be great. I know the winch is smack on 38 kg if you've got two bags of cement around =P

[B92 8NW]

How partially retarded of me. If the rate is 180 lb/in then a 40kg winch will lower about 11mm than whatever yours measures...

[Vern]

Yeah forgot to measure it, remind me tomorrow, you still runnig 235/85's? same as me?
text me on 0403 5371479 to remind me and i'll text you back.:)

[B92 8NW]

Running stock size again till a 1HDFTE appears under the bonnet.

What's your real number?

Cheers

[B92 8NW]

dw, found it.

[Vern]

well ours worked out to approximately 520 rear and 480 front, that is supposed to be a 2inch lift:(

[B92 8NW]

Thanks.

I had a good look and re measure with brake off on level ground and the difference isn't that bad. Anyways that rules the reds out.

[Vern]

I reckon these reds are sagged, they came out of my old rangie with the holden stroker in it:(

[Vern]

Could try there orange ones, same rate, longer length. the ones in mine, well thew rears would be (purples) 180,000k old, fronts (red) well have been on it for 100,000k, on my rangie prior to that for god nows how long (on it when i bought it)