DA5091 Britpart Dunlop SLS Air Spring Lift Kit +50mm - extended longer airbags

**twr7cx** · 11th September 2019, 09:53 AM

I haven't seen any discussion on this yet and couldn't find any old threads through searching. Looks like Britpart have released DA5091 < Air Spring Lift Kit | Britpart > which is an Air Spring Lift Kit +50mm consisting of longer Dunlop airbags.

discovery-2-air-spring-lift-kit-dunlop-da5091-10314-p.jpg

I'm not sure what the two brackets and bolts are for that are shown in the picture as being included?

The other issue is shock absorbers to match with it. Personally, at present I run the +2 Bilsteins with Les Richmond Automotive White Tiger 2" lift.mounts spacers to raise the bottom mounting point up and a 2.5" spacer under the airbags. I think I'd have to change my shock absorber setup to be able to get any more compression travel from these airbags.

**jwb** · 11th September 2019, 10:18 AM

Probably this thread on d2bc

http://www.thed2boysclub.co.uk/viewt...pring&start=98

Brackets likely for the height sensors.

If, like me, you already have a lift kit with spacers under standard bags I don't see the point in changing. Maybe someone can advise.

**twr7cx** · 11th September 2019, 11:12 AM

Originally Posted by jwb

Probably this thread on d2bc

Originally Posted by jwb

D2BC.co.uk - Login

Cheers, I'll have a read.

Originally Posted by jwb

Brackets likely for the height sensors.

Ah of course, you'd be right there.

Originally Posted by jwb

If, like me, you already have a lift kit with spacers under standard bags I don't see the point in changing. Maybe someone can advise.

Depends on what your wanting to achieve. I'm not sure how much flex the back end of the D2 allows or whether you could take advantage of the extra 50mm of travel that these would offer.

Also as mentioned it requires shock absorbers that can compress down and extend up to facilitate the longer springs longer travel - which I don't think that the Bilstein +2" that many of us are using could do (even though they're +2" shocks, that's +2" over the standard coil spring shocks which AFAIK are shorter than the standard SLS shocks - so they're not really +2" in SLS application).

According to Fluids in < Discovery 2 front & rear shock length list > the specs for the standard rear SLS shocks are:

Rr closed 360mm / open 570mm

So you'd potentially need replacements that have the same close but can open up to 620mm. The closest on that list would be Bilstein BE5-B995 Rear 618 388 - (Manufacture supplied lengths) and/or Koni 82-2569 Rear 613 388 - (Manufacture supplied lengths). If they can't close down as small then you'd need to extend your bump stops to protect them.
A 3" lift, using these airbags and a 1" spacer underneath, would need closed 385mm / open 645mm then and a 1” extension on bump stops. The closest thing to that is Terrafirma TF128 Rear 640 390 - (Manufacture supplied lengths) which I doubt is up to the old Bilstein performance levels... Otherwise modify the 2" suspension dropper < White Tiger Rear D2 shock mount raiser > to a 1" version and utilise the Bilstein BE5-B995.

There's potentially also consideration of the angle of the airbags. With my 3" lift which consists of the standard air bag and 2.5" spacers underneath the spacers are angled to bring the airbag back to it's standard angle so it's not trying to be curved by the axel going further down.

**twr7cx** · 11th September 2019, 01:24 PM

Originally Posted by Gruffalo post_id=739443 time=1554970198 user_id=9170

Originally Posted by MadTom post_id=739383 time=1554893612 user_id=368

With longer springs or air bags you have to use also longer bump stops, according to the shocks you have. With longer springs you have to calculate, that the bump stop it there to protect the shock from bottoming - they are not designed for this, and can be destroyed. With air bags, you have also calculate with broken (exploded, punctured) bag or broken sensor - the bag can fully deflate and is it good to be able to move the car, without tyres catching something on the car, destroying it or damaging the tyre itself.
I have 5cm lift and 235/85/r16 tires for long time, and longer bump stops was part of the lift installation. With deflated air bag, I can still move the car, without any damage.

To make a small correction to your statement(s) Longer bump-stops will protect the wheel house area from damage IF you fit larger tyres. However there is no risk for even the standard shocks (dampers) from bottoming out (fully compressed length) because if with the vehicle sitting on the standard height bump stops the shocks only close to a length of 420 and their capable closed length is 360 - so you have over 2" of overhead as standard. What it will limit you on is axle drop as the shock may 'top out' sooner due to the offset being moved nearly 2" further down (it's not linear in proportion to the longer air-spring but a function of trigonometry as the ride height changes)

For reference a few shock manufacturers dimensions are given below:

Land Rover (OEM): Open/Closed 570/360
OME: Open/Closed 587/368
Terrafirma Std: Open/Closed 585/360
Terrafirma Adj +2: Open/Closed 615/375
Terrafirma Adj +3: Open/Closed 665/410

Another option to avoid 'top out' is to install shock lifter plates on the bottom mounts instead of buying replacement shocks

< http://www.thed2boysclub.co.uk/viewt...ring&start=112 >

Thread: DA5091 Britpart Dunlop SLS Air Spring Lift Kit +50mm - extended longer airbags

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