BDS TJ Rear 3" Spring Bump Stop - JeepForum.com

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post #1 of 42 Old 06-27-2016, 03:57 PM Thread Starter
Trevlaw
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BDS TJ Rear 3" Spring Bump Stop

I can't seem to find it anywhere, but does anyone know the compressed length, or how much bump extension is needed to prevent coil bind on the BDS TJ rear 3" springs. If anyone has these springs how good are they. I have heard good things about BDS springs and they are considerably less expensive than the Savvy 3" rears


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post #2 of 42 Old 06-27-2016, 04:59 PM
88hatchy
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You'll probably need to bumpstop for shocks before needing to worry about the springs.

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post #3 of 42 Old 06-27-2016, 05:17 PM Thread Starter
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Quote:
Originally Posted by 88hatchy View Post
You'll probably need to bumpstop for shocks before needing to worry about the springs.
Maybe, maybe not. I want to know what the compressed length of the BDS 3" TJ rear coil spring is or how much bumpstop extension is needed to prevent coil bind.
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post #4 of 42 Old 06-27-2016, 05:36 PM
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Do you have the coils? If so, measure the wire thickness and do the math. Though as already mentioned, shocks are far more likely to be your limiting factor.

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post #5 of 42 Old 06-27-2016, 05:41 PM Thread Starter
Trevlaw
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No do not have them, but if the bump stop requirements to prevent coil bind are close to the savvy 3" rears I may get BDS coils since they are only $106
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post #6 of 42 Old 06-27-2016, 05:53 PM
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Quote:
Originally Posted by Trevlaw View Post
Maybe, maybe not. I want to know what the compressed length of the BDS 3" TJ rear coil spring is or how much bumpstop extension is needed to prevent coil bind.
BDS coils will tolerate full bind. Like several have stated, the bigger fish to fry is avoiding shock over-compression.
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post #7 of 42 Old 06-27-2016, 05:55 PM
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What size shock are you intending to run. Get the compressed length of that before you make any final decisions.

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post #8 of 42 Old 06-27-2016, 06:04 PM Thread Starter
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I'm intending to run something around a 12" travel shock, but I am going to outboard the rear and try to set it the upper mount so as to be able to get full bump without bottoming out the shock. This is why I want to know the compressed length of the 3" BDS coils because I'm trying to set it up so my shocks aren't the limiting factor. If I an figure out how much bumpstop I need for the springs and make sure everything else clears then I can outboard the shocks so the springs and shocks limit my travel at the same time. If anyone knows the compressed length of the BDS or even the savvy 3" coils it would be greatly appreciated because I can't seem to find it
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post #9 of 42 Old 06-27-2016, 06:22 PM
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How do you plan to split the 12" of travel? With 3" springs I think it could be interesting. Realistically, I think you are going to have to bias a little to down (versus a roughly equal split). And in that case you are going to have to start worrying about coils unseating. Between bumpstopping for coil bind and potentially limit strapping for coils unseating you might bolt up 12" shocks but I wonder whether that will be your true travel.

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post #10 of 42 Old 06-27-2016, 06:28 PM Thread Starter
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Well I'm planning on building around 33s so that will help with up travel. I'll have 3" coils, with half an inch extra from my 8.8 and a 1.25" body lift. I had done measurements a while ago and I'm pretty sure I should have enough room in the rear for 6" of up travel. The reason I'm trying to find the compressed lengths and the free lengths of the springs is to figure out what I need to do bump stop and unseating wise, but I have still yet to find those lengths...
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post #11 of 42 Old 06-27-2016, 07:12 PM
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Here is the BDS catalogue:
http://bds-suspension.com/images-cat..._Cat_specs.pdf

And a thread that identifies the part number as 3" BDS 034302.
Official spring rates and sizes OME, BDS and others

Both list the wire diameter as 0.563".

This picture shows 6 turns to worry about.


6 turns X 0.563" wire diameter = 3.378" at bind. Plan on ~4" to be safe.

Mub8 shows us full factory bump:

bumpstops, shock length, and tires size. help me iron out the fuzzy points..

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post #12 of 42 Old 06-27-2016, 07:31 PM Thread Starter
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Thank you for that. I think the BDS rears are actually 034308 though and the diameter is .625 for those which would make it 3.75. they say they have a 14.74 free length and stock coils at ride height are 8" I believe. 3" of lift would mean ride height with these is 11" and that they unseat at 3.5" - 4" of down travel, right? If that's the case these springs won't work for my plans. Anyone know of a 3" coil with a longer free length or what the free length of the savvy 3" rear coil is. I emailed Gerald numerous times and he never responded or answered my questions
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post #13 of 42 Old 06-27-2016, 07:35 PM
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Gerald is a little touchy/cautious about publishing the Savvy spring measurements. I have seen others post the lengths, though.

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post #14 of 42 Old 06-27-2016, 07:41 PM
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Also FWIW, my Jeep is currently sitting on an old Currie 4" rear that gives me 2.75" of lift with 15.75" free length. See my build thread for a little more info. We might be investigating similar things right now.

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post #15 of 42 Old 06-27-2016, 07:44 PM Thread Starter
Trevlaw
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Quote:
Originally Posted by jjvw View Post
Also FWIW, my Jeep is currently sitting on an old Currie 4" rear that gives me 2.75" of lift and 15.75" free length. See my build thread for a little more info.
I thought you determined that they were actually 3" coils? Or am i remembering wrong?
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