What settings do you have on your air bags?

[poleonpom]

I recently replaced my rear airbags with Arnott 3s and I'm wondering what I should reset them to?

First off, does anyone know what the original factory height settings were?

With the new bags on the rear, with standard shocks etc, what is the safe levels I can inflate to?

[PeterAllen]

I dont have the proper bump stop axle settings but on standard tyres 16" rims the road to centre wheel arch measurements I believe are Access 740, Low 780, Standard 800 and High 840. Others can give details about Series 3 settings as I have only the standard bags and if inclined you can make up the blocks and work off the axle.

[p38arover]

First off, does anyone know what the original factory height settings were?

One would need to fit a set of calibration blocks and then do some measurements. I have a set of these. I did a sketch so others could duplicate them.

See http://p38arover.com/rover/p38a/LRT_60-003.pdf

https://www.aulro.com/afvb/images/imported/2012/03/185.jpg

[Keithy P38]

I use the guard to wheel centre measurements, however they can be inaccurate due to body movement or past accidents, etc, so for something ridgey-didge you'll be after axle to bump stop measurements, otherwise go the guard measurements!

[glenhendry]

I think it's worth noting, that many of us seem to muck around with these height settings with some success, but we are talking about affecting the 'weight on wheels' at four corners and this could really affect handling. Every car's chassis is different by mm's, especially after years so the calibration block method really is safest. Consider the situation where you have slightly too much weight on diagonal corners (even 1-2mm), you could be see-sawing down the road. I dont want to be alarmist, but 2600kg objects that do 120kph should be accurately suspended. [thumbsupbig]

I too am close to lifting mine slightly with Gen III springs and I reckon I will make some blocks and then make them available to the SE Qld fraternity. :)

[p38arover]

Interesting. I've never actually used my blocks. Maybe I should do a calibration.

[Hoges]

According to the official Land Rover EAS Systems Document, the Standard height for all air springs is set as follows: bump stop stub to axle pad distance 105 mm +/-4mm Rear; 100mm +/- 4mm front.
All other measurements are derived form these.

Wheel arch-floor measurements etc are all proxies for the bump stop-axle pad distance and do not take account of body twist/ill fitting panels/ anomalies in tyres etc etc.

Once you have the F/R at the correct height (make up some hardwood blocks and slot them in to set the vehicle) you can then measure the wheel arch -floor distance for each corner against the correct standard height...

hope this makes sense...

[p38arover]

One problem I see with hardwood blocks is that inserting them between the bumpstops would be ill-advised. The bumpstops are, I believe, designed to deform under load to provide some "suspension" after an EAS hard fault.

As a result, the height might not be maintained with the blocks in place.

[PaulP38a]

Good point Ron. So I guess the recommondation is to remove the bump stops before using the block calibration method...

For anyone that has not removed the bump stops, they simply push on/pull off a mushroom-shaped lug under the chassis rail. A squirt of your favourite lube up the guts of the bump stop will make it easier.

To pull them off, twist them at an angle and gently rotate until they come off.

To put them back on, my favourite method is to jack up the car, and use some wooden blocks to position the bump stops in line with the "mushrooms", then lower the car back on to them.

Cheers, Paul.

[Hoges]

True... I removed the foam bump stops so that the blocks were in solid contact.
The dimensions of the official calibration blocks are such that they fit through the holes in the bump stops and remove this problem.

The official calibration blocks will only work effectively in conjunction with a Test Book.

Now, if one copied Ron's drawings but made the larger blocks to conform with the overall dimensions listed previously (2 x 105mm plus 2 x 100mm) then one would have a perfect set to use with a Faultmate without having to remove the bump stops :D

[redandy3575]

Is there a chart we can go off?

[zhoey]

One problem I see with hardwood blocks is that inserting them between the bumpstops would be ill-advised. The bumpstops are, I believe, designed to deform under load to provide some "suspension" after an EAS hard fault.

As a result, the height might not be maintained with the blocks in place.

The rubber stops are so easy to remove and install. So removing them to calibrate EAS height is no issue at all.

[DT-P38]

Now, if one copied Ron's drawings but made the larger blocks to conform with the overall dimensions listed previously (2 x 105mm plus 2 x 100mm) then one would have a perfect set to use with a Faultmate without having to remove the bump stops :D

Now if there was a retired P38 gentleman out there willing to sell (or make for sale) a good set for use by the Vic AULRO'ian community I would be happy to collect money to pay for them! we could all do it right down here too!

[zhoey]

Now if there was a retired P38 gentleman out there willing to sell (or make for sale) a good set for use by the Vic AULRO'ian community I would be happy to collect money to pay for them! we could all do it right down here too!

I just bought a length of 25mm (1") nylon bar from a hardware store and put a hacksaw to it. After all, the tolerances are to be within 4mm IIRC.

[Keithy P38]

To give you some data I collected Poleonpom, see this thread. The measurements are wheel arch to wheel centre.

http://www.aulro.com/afvb/p38a-range-rover/125765-height-limits-eas-using-faultmate.html

Hope it helps! I'm pretty sure I got an extra inch or two in both normal and high settings with the numbers in the first post. Can't remember off the top of my head!

Cheers
Keithy

[poleonpom]

To give you some data I collected Poleonpom, see this thread. The measurements are wheel arch to wheel centre.

http://www.aulro.com/afvb/p38a-range-rover/125765-height-limits-eas-using-faultmate.html

Hope it helps! I'm pretty sure I got an extra inch or two in both normal and high settings with the numbers in the first post. Can't remember off the top of my head!

Cheers
Keithy

Great link to your thread Keithy, when I read it I remembered it!

I'm up for making some blocks and having some good clean fun re-setting the suspension, it'll make a change from fuel pumps, squirting fuel and stuffed up fuel filters!

Cheers,

Jonathan

[Keithy P38]

Yeah it's a welcomed change from that for sure!

The added height means my towbar does not scrape in gullies now! Higher than my mates 100 series with 2" lift and 33's! And I'm running smaller tyres!