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Bumpstop Theory
https://auszookers.com/forum/viewtopic.php?f=5&t=5779		 Page 1 of 1
Author:  lump_a_charcoal [ Thu Jul 30, 2009 2:17 pm ]
Post subject:  Bumpstop Theory
I need to fit bumpstops to my Sierra -

Is it as simple as figuring out the clearance between the tyre and the top of the guard and using that (minus a bit)?
I am SPOA with 31s, plus about 1 inch springs (but I will be flattening them out a bit). What would be a good length front, and rear bumpstop?
Author:  tanshi [ Thu Jul 30, 2009 2:57 pm ]
Post subject:  Re: Bumpstop Theory
for my mind on up travel the wheel lifts until the axle pivots on the bump stop forceing the other side down. There is noting really to stop the wheel from continuing to rise until it scrubs. Of course it will stop eventually but just measureing the amount the wheel can rise into the wheel arch isnt really enough i dont think.
Author:  royce [ Thu Jul 30, 2009 3:44 pm ]
Post subject:  Re: Bumpstop Theory
whatever will break 1st minus a bit, so tyres in guards, shocks bottoming out, steering binding etc
Author:  lump_a_charcoal [ Thu Jul 30, 2009 4:23 pm ]
Post subject:  Re: Bumpstop Theory
So I need to flex it to see really....
Author:  tanshi [ Thu Jul 30, 2009 4:29 pm ]
Post subject:  Re: Bumpstop Theory
i think with mine i got some blocks of wood, a couple of g clamps and a ramp and with trial and error moving them around and different sizes figured out what worked the best.
Author:  royce [ Thu Jul 30, 2009 5:42 pm ]
Post subject:  Re: Bumpstop Theory
measure distance till shocks are bottomed out, take off 20-30mm then measure the distance between diff and where bumpstops will go, the difference in these 2 measurements is your bumpstop length, no real need to flex anything
Author:  brendan [ Thu Jul 30, 2009 6:46 pm ]
Post subject:  Re: Bumpstop Theory
basicly you want your springs to invert about an inch. because i springs are flat i only have about 1.5inch of uip travel. this will also depends on your shocks
Author:  lump_a_charcoal [ Thu Jul 30, 2009 7:11 pm ]
Post subject:  Re: Bumpstop Theory
royce wrote:
measure distance till shocks are bottomed out, take off 20-30mm then measure the distance between diff and where bumpstops will go, the difference in these 2 measurements is your bumpstop length, no real need to flex anything


Is the end of the shiny part of the shaft generally the limit of travel?
Author:  royce [ Thu Jul 30, 2009 10:55 pm ]
Post subject:  Re: Bumpstop Theory
yeah you want to be on the bumpstops to hit before the shocks are fully closed
Author:  mcwilly [ Fri Jul 31, 2009 5:23 am ]
Post subject:  Re: Bumpstop Theory
Anyone got any pics of bumpstop setups eg what was used and where they were mounted for spoa
Author:  joeblow [ Fri Jul 31, 2009 3:27 pm ]
Post subject:  Re: Bumpstop Theory
will post pics and set up data tonight.
Author:  lump_a_charcoal [ Fri Jul 31, 2009 4:08 pm ]
Post subject:  Re: Bumpstop Theory
Thanks Joe
Author:  Saam [ Wed Aug 05, 2009 5:36 pm ]
Post subject:  Re: Bumpstop Theory
Hello bump stop thread i found you, lets get this party started
Author:  Saam [ Wed Aug 05, 2009 9:44 pm ]
Post subject:  Re: Bumpstop Theory
well i have

front shock distance before fully compressed approx 95mm

distance from chassis to diff housing 225mm

rear shock distance before fully compressed approx 110mm

distance from chassis to diff housing 230mm

on my front shocks it seems the lower mount on the right is 10mm lower than the left so i got a measurement of 105mm but thats irrelevant i will work with the smaller amount

so i should be getting bump stops of around

Front 225 - (95-25) = 150mm ?
Rear 230 - (110-25) = 145mm ?

seems pretty big but is probably right
Author:  Saam [ Thu Aug 06, 2009 12:22 am ]
Post subject:  Re: Bumpstop Theory
looks like 80 series rears are about 170mm, anyone know if they can be cut down, they are progressive aswell so should be nice, think i might only be able to use them on the rear though
Author:  mcwilly [ Thu Aug 06, 2009 1:05 am ]
Post subject:  Re: Bumpstop Theory
Holy shit they are huge bump stops mine will be roughly 50mm I think with standard front rubbers on the front and rear
Author:  Saam [ Thu Aug 06, 2009 1:21 am ]
Post subject:  Re: Bumpstop Theory
standard bump stops are 50mm :)

Image
thats a standard bumpstop with a 20mm spacer under it so you see how far away my diffs sit lol

if you look at a 2 inch lifted coily it only sits like 100mm or so away
Image

so with bigger tyres, springs that are longer that do not compress as much and shocks i don't want to kill i think 150mm is starting to make sense and work with my setup..
Author:  kenn [ Thu Aug 06, 2009 1:45 am ]
Post subject:  Re: Bumpstop Theory
Your dead wright Saam.. :wink:
Author:  mcwilly [ Thu Aug 06, 2009 4:23 am ]
Post subject:  Re: Bumpstop Theory
Didn't realise it was coil mines leaf spoa
Author:  lockdup [ Thu Aug 06, 2009 7:06 pm ]
Post subject:  Re: Bumpstop Theory
http://i463.photobucket.com/albums/qq35 ... tsetup.jpg

http://i463.photobucket.com/albums/qq35 ... asetup.jpg

Done by Joe
Author:  Saam [ Thu Aug 06, 2009 9:26 pm ]
Post subject:  Re: Bumpstop Theory
did my rears today, front will not be as easy, these are from a 100 series land cruiser, they are exactly 150mm tall and are nice and squishy so should be perfect..


Image
twist off old

Image
put a bolt in new

Image
bolt on new :)
Author:  Saam [ Fri Aug 07, 2009 1:29 am ]
Post subject:  Re: Bumpstop Theory
that makes them look even huger, i can cut them down once i have tested them out :)
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