I currently have the setup in my signature, but my question pertains to the coils/bumpstops mainly. Over the past few years I've built up my JKU to a 3.5" lift (2.5" coil/ 1" spacer). After what felt like a myriad of problems, I'm trying to decide my next step. One of which is to keep my current coil setup or replace with new 3.5" or 4" springs. Also, in doing this, do I need to replace or extend my bumpstops? The image below shows that I have roughly 2.5" - 3" of space between the yellow bumpstop and my axle. should this be more or less? What will I gain if I go to new coils?
Also, I'm convinced I'm nailing the bumpstops with every decent pothole on my daily drive in to work, is this normal? It seems like I should have more room to travel and be a bit smoother on impact.. any opinions on this? Also, if anyone wouldn't mind, I'd love to get some pictures of this angle of the front suspension to compare.

Thanks

 

First, bump stops are supposed to do that. It prevents coil bind or shock damage...OTOH, if you have bump stop extensions that are too long for your lift, then you may be hitting them too soon. That is sort of a trial and error thing or something that comes from the vendor that supplied the lift (they will know what, if any, bump stop setup you need...or they should!). I am not a fan of mixing coils and spacers as that can cause the sort of issues you are having...IMO, best to stick to one or the other, so, in that regard, loose the spacer and use springs. The spacer may be lowering your bump stops too much...

 

I personally dont use my bump stops no need for my set up it all depends on how everything measures out and if your hitting anything

 

Are you sure the stops are bottoming out?

Chalk the pad. See if it hits. What shocks do you have ?

it's not the yellow bumper you need to worry about. Chalking will give you an idea but the solid plastic is actually your bump stop.

 

I personally would remove the lower bumpstop and see i your tires rub on the fender...

 

Hold what you've got but figure out where you need to be on bumpstops first. Compress the shocks and figure out a measurement then add 1/2" to it to be safe- that's the space that your bumpstop needs to contact so you don't overcompress your shock. If you determine that there is too much bumpstop then you can remove some. The 4" coils *shouldn't* help your bumpstop situation because you *should* go with longer shocks which *should* have a different compressed length which you'll need to compensate for. Figure out your bumpstops first and then look for a 3.5" coil to replace your coil/ spacer combo.

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I'm still trying to figure if that is 2 1/2 spring lift. Your springs look way new for that short of up travel. I just put on these JKS 2" and I have more with my hockey pucks

 

[QUOTE=karls;3573478]Hold what you've got but figure out where you need to be on bumpstops first. Compress the shocks and figure out a measurement then add 1/2" to it to be safe- that's the space that your bumpstop needs to contact so you don't overcompress your shock. If you determine that there is too much bumpstop then you can remove some. The 4" coils *shouldn't* help your bumpstop situation because you *should* go with longer shocks which *should* have a different compressed length which you'll need to compensate for. Figure out your bumpstops first and then look for a 3.5" coil to replace your coil/ spacer combo.

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Good advice, but no need to compress the shocks if you know their specs. Compressed length minus current lenth = available compression of shock (A).
Measure the distance between bump stop and bump then add 1/2" for safety margin (B).

If A = B your set.
If A > B your bump stop extension is too tall.
If A < B then you are bottoming your shock.
If A <> B then you probably need to remove the shocks, coils, spacers and bump stops and install coil-overs

Example: compressed lenght of shock is 15" and extended is 27"
You measure 20"; A = 20-15 = 5" available shock travel
You measure between bumps and it is 4" + 1/2": B = 4.5"
A > B so you are bottoming on the bump stop a 1/2" too soon.

 

I'm running bilstein 5100 for a 3-4" lift.

I read the greater than equal than post but it still is a bit confusing. How do I determine how much compression my shocks have? Also this is the front setup, although rear is similar. I just had new control arms put on which is why I'm aware of it.

 

Compressed16.41
expanded 27.56
From bilstein website

Where do I measure my current length?