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View Full Version : Coil Springs to Air Spring Conversion - report



weeds
17th October 2017, 09:38 PM
I'm sure I posted something on this but buggered if I can find.

2000 Defender Hardtop with Mulgo Poptop.......was the driver for the conversion as I wanted to level the defender before we either jumped out or hop over the seats straight into the back of the defer......didn't want to carry leveling ramps or move the car around/back/forth to get it level. Also want to adjust from the driver seat.

Others on the forum have sourced bits and pieces from all over manufactured brackets.....a couple of mates did there this was and all seem to work.

Being time poor I decided to purchase the kit developed by Air Bag Man given they have sponsored Defender Days.

Install - pretty straight forward....from memory on and off over a weekend.

The defender had terrafirma shocks fitted at time of purchase so I figured I would give them a chance.

No rubbing anywhere.

Ride - after forking out a decent amount of cash can sometimes could your view but I do see why Land Rover have gone to air suspension. I reckon the ride has improved. The shocks seem to work well with the air springs.

With the car empty we run around 38 PSI in the bags. Measuring the spring height we are sitting a little low as per what's recommended for the spring.

We just got back from 10 days on Fraser Island, by far the biggest test driving the beach and sand tracks everyday. We were also loaded up in touring mode. For the run up to rainbow we had 48 psi in the bags...on the island I started with 52 thinking it would be better with the rougher tracks, ended up back at 48 halfway though the week.

I'm about to fit 130 front springs which I suspect will raise the front, this will mean I can raise the rear using a bit more air which should put me in the recommended operating range for the bags.

Be interesting how they perform on extended corrugations.

Adjusting - easy as with the inflate/deflate switches located at the centre console. I also have manual inflation valves on the rear cross member although I don't carry a hand/foot/track pump, putting faith in the ARB Twin compressor not failing. It takes seconds to level each time.....we would normally lower the high side, in some cases it lowered to the bump stop which removed some of the rocking when in bed. Leveling was also handy for opening/closing the rear door with spare wheel carrier and two fat bikes swinging off the carrier giving better control over the door as we no longer have the Mulgo gas strut. Leveling and returning to ride height happened every day and some times multiple times per day.

Overall I have been super impressed with the installation, operation and ride. Leveling for our Mulgo Poptop just makes the whole setup work nicely. Not for everybody, but I would recommend the conversion.

I'm also wondering if it may help when traction is lost when crossed up, I can take air out on the side that is tucked up in the guard and put some air into the other side putting more pressure on the wheel which maybe enough for traction.

I will dig out some pics.

weeds
17th October 2017, 09:42 PM
Some pics at the end of this thread

https://www.aulro.com/afvb/members-rides/240195-overland-hardtop-livin-life-4.html

weeds
17th October 2017, 09:49 PM
Found a couple of the bags going in.

https://www.aulro.com/afvb/images/imported/2017/10/460.jpg
https://www.aulro.com/afvb/images/imported/2017/10/461.jpg

weeds
17th October 2017, 09:52 PM
My compressor did fail.......well blew infuse for no apparent reason
https://www.aulro.com/afvb/images/imported/2017/10/465.jpg

weeds
17th October 2017, 09:56 PM
Battery, compressor and tank
https://www.aulro.com/afvb/images/imported/2017/10/462.jpg

Inflate/deflate/compressor switches
https://www.aulro.com/afvb/images/imported/2017/10/463.jpg

Digital Air pressure gauge
https://www.aulro.com/afvb/images/imported/2017/10/464.jpg

Lotz-A-Landies
17th October 2017, 11:02 PM
Have you retained the anti-roll bars?

rar110
18th October 2017, 05:25 AM
Good write up weeds. After driving the 110, the EAS on the L322 is great especially with at least 3” range in ride height.

weeds
18th October 2017, 05:45 AM
Have you retailed the anti-roll bars?

Yes.....

Pedro_The_Swift
18th October 2017, 06:34 AM
Takes around 70psi to lift a D2 to ride height,,, mustnt be a lot behind your front axle[bigrolf]

weeds
18th October 2017, 08:16 AM
Takes around 70psi to lift a D2 to ride height,,, mustnt be a lot behind your front axle[bigrolf]

When I purchased the defer rear axle weight was 1220kg.

cal415
20th October 2017, 11:11 AM
Interesting setup, do you have part no of bags used?

Regarding PSI, the firestone truck springs vs D2 bags are much larger diamater if they are 1t14c style bags, they cant really be compared, im not sure what i would be running in mine but it would be similar 40-60 depending on load but i run a longer bag, for the front in mine i would be closer to 80-100psi running a bag that is similar to a range rover/d2 setup.

cal415
20th October 2017, 11:12 AM
and yes running bags on a trip like fraser you just cant compare coils to airbags, they are SO much better, especially if you get your shocks right.

Vern
20th October 2017, 11:30 AM
and yes running bags on a trip like fraser you just cant compare coils to airbags, they are SO much better, especially if you get your shocks right.What have you done shock wise??

weeds
20th October 2017, 12:55 PM
What have you done shock wise??

Be interested as well.....as I'm sure I will be changing out the existing.

weeds
20th October 2017, 12:56 PM
Interesting setup, do you have part no of bags used?

Regarding PSI, the firestone truck springs vs D2 bags are much larger diamater if they are 1t14c style bags, they cant really be compared, im not sure what i would be running in mine but it would be similar 40-60 depending on load but i run a longer bag, for the front in mine i would be closer to 80-100psi running a bag that is similar to a range rover/d2 setup.

I think ranga post the part number of the bags I used. I purchased from air bag man and not sure I took note of the part number.

cal415
23rd October 2017, 09:20 AM
I run custom valved ultimate suspension shocks, while they are not the easiest mob to deal with there shocks have done me well, and before you ask i dont know the valving specs of the top of my head but they would have it on record.

I really dont like the top mount from the airbag man setup, you loose a lot of room spacing the bag down so far, but running the shorter bag and piston its probably not an issue -i run the 5in piston and 1t14c-8 bags, its a combination of 2 different airbag setups - how long are the rear shocks compared to standard? i originally had a similar set of mounts from airbag man but it was never going to work for me so i remade them shorter to tuck the back up into the spring perch a little further, while it does touch the bellow on the perch sometimes its never been an issue in the 6 years i have ran this setup and it works well but i still need to go to longer shocks to full use the length of the bag, i also need to make up a custom rear sway bar to take some of the body roll with my 130 out being so top heavy with my fridge mounted high.

I am seriously considering a similar setup to what you have done here in the back of my td5 110 as im sick of he terrible ride from the HD rear springs...