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Unread 09-26-2013, 01:24 PM   #61
Flyboys
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Quote:
Originally Posted by ca07wk View Post
I dont think itll compress the spring much more then it is now, your just raising the lower spring purch makng the spring sit higher up on the strut body. I would try the Bilstein set to 2" without the spacer first.
But wouldn't the spring be compressed at least another inch?

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Unread 09-26-2013, 01:46 PM   #62
zc911
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no the cup the spring sits in gets moved up and the shock just extends further out
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Unread 09-26-2013, 02:13 PM   #63
sk1er18
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The shock doesnt get extended.

Raising the lower perch adds preload to the spring. Its just like adding a coil spring spacer in the assembly. Fully extended length of the assembly remains constant.
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Unread 09-26-2013, 02:25 PM   #64
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i thought the extended length would have jsut increased
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Unread 09-26-2013, 02:28 PM   #65
sk1er18
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Quote:
Originally Posted by zc911 View Post
i thought the extended length would have jsut increased
It doesnt.

Fully extended length stays the same. Move spring perch up = add preload to spring = lift.

One of the benefits that Bilstien touts is that these dont hyper extend the front end at full drop.
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Unread 09-26-2013, 08:14 PM   #66
sunrcr69
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Read up
http://www.bilsteinus.com/fileadmin/...WebArticle.pdf
Preload is not added to the spring when it is adjusted to the higher settings. The shock has longer than stock travel therefore the whole assembly gets longer = lift.
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Unread 09-26-2013, 08:29 PM   #67
sk1er18
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Quote:
Originally Posted by sunrcr69 View Post
Read up
http://www.bilsteinus.com/fileadmin/...WebArticle.pdf
Preload is not added to the spring when it is adjusted to the higher settings. The shock has longer than stock travel therefore the whole assembly gets longer = lift.
Well it looks like we're both partially wrong

First and foremost- the strut is longer than stock by 1/2-3/4" (cool stuff, glad to see ).

It also increases pre-load. The fully extended length is the same regardless of which "setting" its on. It doesn't get any longer whether its on its lowest setting vs its highest setting.

The brochure you linked even details how the rebound valving of the 5100 is specifically designed to account for the additional preload (whereas throwing a coil spacer in a stock assembly isn't ideal).
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Unread 09-26-2013, 08:37 PM   #68
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Here's a good visual that'll help show you how/why pre-load is added to achieve lift (its for the 5100s but a different application that has a few more settings).

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Unread 09-26-2013, 08:55 PM   #69
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From the article - "Bilstein 5100 Series Leveling Shocks are longer than the O.E. shocks by 1/2” to 3/4”, depending on application. Now when the ride height of the
vehicle is increased by 2”, the Bilstein 5100 Series Leveling Shocks offer additional droop. By maintaining the factory up-travel, this combines for an
increase in overall wheel travel. The result is the lift you’re looking for - along with a great ride."

It says it maintains the factory uptravel. How would that be possible if there is preload on the spring?
Preload on the spring = less travel due to the spring being partially compressed. The spring would bind if compressed the same distance as stock while preloaded.
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Unread 09-26-2013, 08:58 PM   #70
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Quote:
Originally Posted by sunrcr69 View Post
It says it maintains the factory uptravel. How would that be possible if there is preload on the spring?
Preload on the spring = less travel due to the spring being partially compressed. The spring would bind if compressed the same distance as stock while preloaded.
No, additional preload on the spring doesnt equate to less up-travel.

There is still plenty of compression left in the spring, even when pre-loaded.

I'm not sure how else to explain it without a scratchpad (and some beers), but if you've ever assembled a strut you'd know that moving the lower perch upwards will result in spring preload. It doesn't magically add more travel... there's already enough preload on the spring that the strut extends to its max position without any load/weight on it.
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Unread 09-26-2013, 09:26 PM   #71
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I get it (and I've assembled 1000s of struts/coilovers). You are right, there is preload added, but not enough to get coil bind.
I would need the same scratchpad and more beers to explain my original theory
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Unread 09-26-2013, 09:30 PM   #72
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nothing like talking about jeeps/suspension/mods over a few beers! It's possibly one of the best parts of this type of hobby
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Unread 09-27-2013, 06:10 AM   #73
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Well think I'm gonna just take out the RC 2" spacer lift in the front and then adjust the Bilsteins too 2" and call it a day. Hope to report back later tonight on tomorrow.
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Unread 09-27-2013, 07:20 PM   #74
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I am having the 5100's installed with a 1.5 inch spacer in the back along with the rear 5100's on Thursday of next week. I will post up some pics and let everyone know how they ride when done.
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Unread 09-28-2013, 03:47 PM   #75
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Took out the 2" RC spacer in front and adjusted the Bilsteins to max 2". Also still have the RC" spacer in rear with rear Bilstein 5100's as well. Put a 8mm spacer up front. Love it! The ride is awesome, very pleased!
pass.jpeg

rear.pass.jpeg

front.driver.jpeg

driver.jpeg

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