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| bump stops http://auszookers.com/forum/viewtopic.php?f=37&t=42929 |
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| Author: | abs76 [ Thu Sep 12, 2013 9:21 pm ] |
| Post subject: | bump stops |
can someone please explain on a GV when do you have to look at doing anything with bumpstops? eg. extensions/shorter when u lift a little? ... or a lot? ....or only if u add spacers? |
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| Author: | fordem [ Thu Sep 12, 2013 10:43 pm ] |
| Post subject: | Re: bump stops |
The role of the bump stop is to prevent suspension components from, so to speak, slamming into one another, as the suspension reached end of travel - generally speaking, if you lower the vehicle, you shorten the bump stops, if you lift the vehicle, you lengthen them - how & when it becomes necessary will vary with the suspension design and how you lift/lower. The bump stop on the front of a GV sits between the frame and the control arm, in the middle of the spring - if you lift using spacers (coil & strut), what you're doing is moving the top "fixed" position of the suspension down, ideally, the bump stop should be lengthened, if you lift using longer/stronger springs and a long travel strut (as an example OME), the top "fixed" position remains unchanged, the bump stop can be left as is. Get the idea? There are no hard & fast rules - but I would say if you're planning on using spacers, plan on lengthening the bump stops. |
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| Author: | abs76 [ Fri Sep 13, 2013 12:21 am ] |
| Post subject: | Re: bump stops |
that makes sense in plain English .... Thanku for the explanation  but "generally speaking, if you lower the vehicle, you shorten the bump stops if you lift the vehicle, you lengthen them" no wonder im confused I don't know a lot bout suspension, and my other vehicle is lifted but they cut the bumpstops .... still tying to understand that setup fully ;/ so had to ask re GV bumps to know for sure. |
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| Author: | fordem [ Fri Sep 13, 2013 11:34 am ] |
| Post subject: | Re: bump stops |
What is your "other vehicle" and how was it lifted? If the vehicle uses a telescopic strut with the bump stop on the strut shaft, and the lift involves spacing the upper strut mount down, it might be necessary to cut the bump stop, but it sounds a little strange. |
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| Author: | abs76 [ Sat Sep 14, 2013 12:12 pm ] |
| Post subject: | Re: bump stops |
Mitz Delica - Coils, Shocks, Torsion Bars (wound up) - that's about all I know .... re: bump stops - have to b cut down .... but they havnt been yet. Had a 4x4 workshop (who had my car for 3MTHS) do the job and its NOT done right. soooooo cranky! Been that forum for the past 8mths trying to solve my probs but I don't know enough yet to fix it myself. Been to plenty of other workshops here askin to set it up right but they refuse to touch it :/ Only starting to learn workin on cars myself on my cheap 4cyl GV. The Deli is like a monsta truck compared to GV & (i got no $) its cost me 2 much.... to break it .....like i seem to being to my GV right now :/ Oh well at least im tryin and we only learn from our mistakes. Just lucky didn't make any sorta mistake that the spring could've ended up in my head, from wat i know now, one more nut off & kaboom :0 so they tell me. |
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| Author: | fordem [ Sun Sep 15, 2013 9:57 am ] |
| Post subject: | Re: bump stops |
Down here the Deli is known as the L300 - my wife is senior management at the local Mitsu dealer, and they have one that I drive occasionally, so I'm reasonably familiar with them - the Deli with torsion bars has the bump stop on the lower arm - as the vehicle is lifted, the arm and the bump stop move down, so there's more space above it - I would expect to have to extend or perhaps put a spacer under the bump stop. |
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| Author: | Gwagensteve [ Sun Sep 15, 2013 5:19 pm ] |
| Post subject: | Re: bump stops |
abs76 - I have a hunch that you're referring to cutting of rebound stops - these are the opposite of bump stops. Many IFS vehicles use rebound stops, which prevent the arms moving downwards more than the engineers permitted. It's reasonably common to increase total suspension travel by trimming down the rebound stop. (I personally think this is a terrible idea, but it's out there and commonly done - I think hilux owners are into it) This might be what was done to your Delica as part of it's suspension work, and why you're thinking that it might be necessary. GV's don't have rebound stops. They do have bumpstops inside the front coils, and fordem's description of when and why you might space them is spot on. Cutting down of bumpstops is normally only done with hacky lowering jobs. The bumpstops are there to prevent damage - trimming them down is rarely a good idea. Steve. |
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