Page 2 of 53 FirstFirst 12341252 ... LastLast
Results 11 to 20 of 524

Thread: Lifted P38 on air - questions

  1. #11
    Join Date
    Feb 2010
    Location
    Townsville, QLD
    Posts
    2,440
    I think I'll bend the top arm at the point where it attaches to to sensor, a few degrees should do the trick.

    The aim is to keep the whole combo from straightening as it could possibly return 180 degrees from the normal position and cause all sorts of dramas!

    I will modify the length of my bottom arm once the kit is installed as I have 4" of extra wheel travel over a standard setup.

    Trial and error will be the order of the day!

  2. #12
    Join Date
    May 2013
    Location
    Manly West, Brisbane
    Posts
    138
    I recently changed out the standard air springs on my 2000 P38 and put in a set of Arnott IIIs, along with a full set of Terrafirma +2" shocks.

    The ride doesn't really feel that much different to original as far as I can tell which is a good thing as I really liked the original ride.


    One thing that does concern me about air springs is what limits the axle travel and stops the spring from being pulled apart when you lift a wheel while off-road? As far as I can see the only things to limit travel are the height position sensors and the shock absorbers and neither seem particularly robust to me.

  3. #13
    Join Date
    Feb 2010
    Location
    Townsville, QLD
    Posts
    2,440
    Shocks limit the travel. It is the better option on a P38 as the bags will pull off the piston if you let the axle droop far enough.

    If it were the height sensors you would be breaking them left right and centre off-road.

    I over-extended a Gen III spring on standard shocks, imagine if I'd had longer shocks to begin with!

    I'm interested to hear about the terrafirma shocks. Do they eliminate the bounce effect in high when you travel over a bump?

  4. #14
    Join Date
    Aug 2012
    Location
    Camden
    Posts
    680
    Quote Originally Posted by rc42 View Post
    I recently changed out the standard air springs on my 2000 P38 and put in a set of Arnott IIIs, along with a full set of Terrafirma +2" shocks.

    The ride doesn't really feel that much different to original as far as I can tell which is a good thing as I really liked the original ride.


    One thing that does concern me about air springs is what limits the axle travel and stops the spring from being pulled apart when you lift a wheel while off-road? As far as I can see the only things to limit travel are the height position sensors and the shock absorbers and neither seem particularly robust to me.
    Did you make any angles spacers or did you just fit the +2 shocks and the gen 3 bags?

    have you lifted wheels off the ground much since? I'm concerned about over extending the bags without adjusting the rear angle of the bags myself. And with Keiths experience at over extending one with standard shocks I would be a little concerned. Also the rear sensor arms might be close to over extending as well.

  5. #15
    Join Date
    May 2013
    Location
    Manly West, Brisbane
    Posts
    138
    The Arnotts claim about +3" extra length on the rear and +2" extra on the front (or something like that) so I just fitted the +2" shocks with no additional spacers but it is a real concern that I might over stress them. I did try to get some spacers from Hard Range but they had just stopped production and had no stock.

    I blew the right hand rear Arnott bag a week or so after first fitting them, it was a gentle gravel road around Mt Mee, it was in high position but only going slowly and the road was fairly flat at that point. It looks like it may have been a manufacturing defect with the bag not crimped properly onto the aluminium base but Arnott express posted a replacement out that's been fine since.

    Once you've heard the 'BANG' and dropped on one corner its always a worry when away from home, especially having the kids eith you. Limping home on rear bumpstops wasn't fun but at least now my spares include a front and rear airspring and a laptop with EAS software.

  6. #16
    Join Date
    May 2013
    Location
    Manly West, Brisbane
    Posts
    138
    Quote Originally Posted by Keithy P38 View Post
    I'm interested to hear about the terrafirma shocks. Do they eliminate the bounce effect in high when you travel over a bump?
    My original shocks were pretty badly worn and very soft so the Terrafirma shocks cut out a lot of 'bounce' but without making the ride hard or harsh, I'm seriously impressed with the ride now so the Arnott/Terrafirma combination will be kept for as long as I have the car.

    I did think about gettings springs and scrapping the EAS after a long ride on bumpstops but I'm confident in my spares and knowledge now, I even have some manual inflation valves that would push onto the 6mm air line and let me use a tyre inflator to pump up the suspension. One day I'll fit some permanent valves and manual inflaters on the air lines under the bonnet too.

  7. #17
    Join Date
    Feb 2010
    Location
    Townsville, QLD
    Posts
    2,440
    Thanks mate! Has confirmed my choice in the Terrafirma shocks!

    As for the right rear Arnott popping, I had the exact same thing happen to me in exactly the same situation! I was on a gravel road taking it steady and she popped! Lucky for me I had a standard bag in my spares kit, and as in your case Arnotts were more than happy to send a replacement.

    Once the lift kit is finished and tested, Peter and I will have a "discussion" on our setups and the option of sharing the drawings. Obviously we need to consider the impact on other lift kit manufacturers (one that I know of which is in the R&D stage at the moment) before publicly sharing, but I'm sure on a small scale it wouldn't impact anyone at all.

    Our kits are similar (mine and Peter's) in that our spacers are of the same design. It's the height and application that is different. I guess you could say it leaves two options for those wishing to DIY - the all out lift'n'travel kit or the conservative lift'with'benefits kit.

    Cheers
    Keithy

  8. #18
    Join Date
    Aug 2012
    Location
    Camden
    Posts
    680

    Thumbs up

    Quote Originally Posted by rc42 View Post
    The Arnotts claim about +3" extra length on the rear
    I'm not trying to cause too much un-needed concern as you've obviously had minimal dramas since.... but the 2 inch extension in the rear shock does give about 3 inch more at the bag I believe because of the angle the shocks are.

    To be honest I'd like no angles/spacers myself and just increased articulation so hope it works well for you, but for me it concerns me too much as I tend to lift wheels fairly often when offroad.

    I've got spare bags, the manual valves in place, the eas immobilising switch, packers for the bump stops for the 265/75/16 tyres in case it ends up on the bump stops..... So slightly cautious but not willing to give up the eas

    As Keith has said my spacers are going to be fairly low front and back, with only the back ones angled, and he is going for a little more lift.

    Keith: I like the way you described the two ideas "the all out lift'n'travel kit or the conservative lift'with'benefits kit.". Sounds like a good marketing slogan

  9. #19
    Join Date
    Feb 2010
    Location
    Townsville, QLD
    Posts
    2,440
    Haha yeah! Slogans are the backbone of the sales industry!

  10. #20
    Join Date
    May 2013
    Location
    Manly West, Brisbane
    Posts
    138
    I was actually thinking about getting some custom spacers made to sit between the bottom of the air spring and the axle, probably only about 40mm lift and really just to reduce the risk of popping a bag.

    I haven't done any measuring and checking but was thinking that the single spacer could extend out to the bump stop and provide some packing under that too as I wouldn't want to damage the air spring by over compressing it either.

    I was also thinking of maybe getting something like these and modifying them:

    (2" Spacer Lift Blocks set of four - 4wheeln)


    If you do develop a good design and are willing to get them produced by a fabricator or just share the drawings I'd be very interested.

Page 2 of 53 FirstFirst 12341252 ... LastLast

Bookmarks

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Search AULRO.com ONLY!
Search All the Web!