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Thread: Lifted P38 on air - questions

  1. #21
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    Our designs are similar but not made from 10mm plate, instead, 4mm. Ours are also cheaper to manufacture but just as sturdy.

    If you decide to go with the customisation of those spacers you only have 4mm in the piston before the hole for your "R" clips.

    Make sure you keep that in mind!

    You will also need to extend your height sensors as they will over-extend and break.

    As for bump stops - you can get an 80series land cruiser bump stop and make the centre hole slightly larger and it will fit as an extended bump stop. They are sectioned so you can also cut them down if you find they are too long.

    As I said earlier, will have a chat to Peter once both of our kits are on and tested before we hand out designs.

    Cheers
    Keithy

  2. #22
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    Keithy

    On my lift at the front I ended up using docking rubber (as seen on the back of delivery trucks) mounted on the bottom plate where the bump stop would normally rest in addition to the standard bump stop.. So far so good, even though it does look a little agricultural. I do like the idea of the 80 series extended bump stops though!

    Gary
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  3. #23
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    Cheers mate.

    Yeah I see what you mean with the docking rubber, that's a good idea!

    Ill still stick with the 80series unit though as I'm going to be working on a maximum articulation setup, so ill be utilising as much of those Terrafirma shocks as I possibly can. Full stroke!

    I actually gave thought to a custom shock and dropping the lower bracket/raising the upper bracket and seeing how far I could take it on bags, however, there comes a point where you must accept that coils will always out-travel airbags.

    I think the outcome will be quite good nonetheless!

    Cheers
    Keithy

  4. #24
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    Keithy

    Good luck with the project. I'll watch with interest

    Gary

  5. #25
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    My two cents worth. My primary reason for adding around 20mm to.the length of the bump stops with 32" tyres, was to prevent severe rubbing in access mode. Just in case the eas collapsed at highway speed. I ended up cutting the originals off at the first shoulder (to retain the fixing hole) and gorilla gluing stepped poly bump stops to them. Works well.

    Need to check my suspension travel. I've added height through eas settings. Does anyone know how the Koni shocks compare on.stroke with the terrafirma's?

    Can anybody show their spacer design/set up?

  6. #26
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    Quote Originally Posted by davidsonsm View Post
    My two cents worth. My primary reason for adding around 20mm to.the length of the bump stops with 32" tyres, was to prevent severe rubbing in access mode. Just in case the eas collapsed at highway speed. I ended up cutting the originals off at the first shoulder (to retain the fixing hole) and gorilla gluing stepped poly bump stops to them. Works well.

    Need to check my suspension travel. I've added height through eas settings. Does anyone know how the Koni shocks compare on.stroke with the terrafirma's?

    Can anybody show their spacer design/set up?
    Your rubbing is that bad is it? I'm running 265/75/16 KM2's (almost a full 32) and my tyres don't rub when on the bump stops (lower than my access mode) unless a small bump is hit then yes it rubs on the rear first, but not grabbing type of rubbing just black scuff marks. Well I know I can drive with no air in the bags, just wouldn't choose to for very long. Wouldn't think there would be major problems on a highway and slowing down with no sharp turns if its on the bump stops without ripping guards apart, maybe some nice fresh black marks on the smooth plastic at worst.... But I'd be lying if I wasn't thinking about the situation now

    The Terrafirma's have roughly the dimensions attached (TF144 and TF145), not sure what the Koni's are without a model number. Keep in mind that with spacers the safe values are likely to be different. This was just something i whipped up at the start of my shock expedition. I had a few other models I had in mind from Doestch as well.

    Edit: Both Keith and myself are in the process of slightly different designs but neither are complete yet. I hope to have mine done in the next month as I have ordered all the bits. See how it all goes though, and will likely share as much info as possible without damaging someone else's business venture whom these ideas were based off.
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  7. #27
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    I have the 265/75R16 KM2 tyres on 16x8 alloy rims and can confirm no rubbing or catching the rear bodywork even when down on bump stops. The tread on the KM2's tapers in slightly so the width where it contacts the road is less, this is enough for it to tuck right up inside the wheel arch with a couple of mm to spare.

    I haven't had the front down to the bump stops but for normal running I did have to remove the plastic mud guards and use some nylon tie strips to pull the plastic inner cover away from the tyre in a couple of places. A couple of small holes for the tie strips in a few places and this has worked really well.


    As I said earlier, my main concern now is over-extending an air bag so I'm looking for some way to protect against that. A metal block between the air spring base and the axle seems ideal as it may improve articulation too but I've also seen a P38 with custom straps between the axle and chassis (looked like seat belt type stuff). My old series IIa had loops from the chassis that went around the axle but movement wasn't so great on leaf springs so that may not be practical.


    Anyway, I've subscribed to this thread and I'll be following progress with great interest.



    Robert

  8. #28
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    Yeah I guess the at tyres (bf 265/65/18) are probably squarer. And me just being paranoid about abrupt stops at highway speed. Just trying to keep it all as safe as possible. Looking forward to.seeing airbag extension piece design as alternate to stretching the bags - as I.am.now. bring it on guys.

  9. #29
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    I have 285/75 KM2's ( basically 33" ) and have only minimal rubbing in access mode on front when turning they just clip the rear inside corner of fender on plastic sill trims, just removed mud flaps F&R.

    I have not spent any time to correct this as it does not happen often, however it would be an easy fix with heat gun onto plastic trim and bend slightly backwards.

    I also have HRA 2" lift kit & GenIIIs - no rubbing in rear arches at all - ever!
    the only issue is the amout of rear axle shift towards passenger side when on offroad height due to panhard rod length. This also causes very slight tyre rubbing on chassis rail on r/h side.

    If someone could come up with way to correct this it would minimise risk to rear left sensor also rear left bag comes closer to chassis.
    Hope this helps.


    I was running Off Road Boss adj shocks allround but had leaking rear so swapped back to bilsteins there. Will be looking for some other type in future but have not decided yet. Just waiting on info from King re option with remote gas etc. Will advise on their thoughts or options later.

  10. #30
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    I machined up the spacer pins tonight at work, last few niggly things to do now and ill put it all together and chuck some pics up. Here's what I've done and what's left;

    Done:
    - Spacers are complete
    - Spacer pins are complete
    - New "direct replacement" longer bump stops sorted (these are also height adjustable)
    - Shocks are on order - have gone with the TF144 all-round.

    Need to do:
    - Lengthen brake lines (will do this when I replace my pads/rotors in a few weeks)
    - Fit the shocks and then adjust the bump stop for maximum up travel
    - Once that's done I'll adjust my height sensors to suit

    Will be a great little kit once complete!

    Cheers
    Keithy

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