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Old April 11th, 2012, 12:31 PM   #1
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Default Measuring for bumpstops - how much spring inversion is too much?

Application is cj7, soa, 5 leaf YJ springs, Ford shock towers.

I'm measuring for bump stops/shocks and would like to know how much spring inversion from flat is too much...1"-2"-3"? It seams opinions vary drastically across internet forums. Guess I'd like to see if there is a concensus around here?

I'm cool with replacing spring packs once or twice a year (stock YJ packs are cheap and available) in the name of more travel but any more than that would change my mind.

First pic is spring arch at static ride height.


Springs compressed flat.


Showing 2" negitive arch. Is this too much?


In a perfect world I'd like to be able to negitive arch them 2-3"... Bad idea, ok idea, or you'll regret it?
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Old April 11th, 2012, 12:50 PM   #2
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I'm interested as well. Let me give my spring guy a call and I'll let you know.
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Old April 11th, 2012, 01:02 PM   #3
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Quote:
Originally Posted by wadey View Post
I'm interested as well. Let me give my spring guy a call and I'll let you know.
I would appreciate that...thanks.
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Old April 11th, 2012, 01:14 PM   #4
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I called A B Spring in Grand Rapids and talked to their custom spring designer. He said for an aftermarket spring with minimal arch (like a stock spring) to limit the spring at -6 inches from ride height.

This number was for general crawling/off roading. If you were going to constantly be shocking the spring with fast movements and weight transfer, ie jumping. You could hurt them over time at -6, and you should limit them more.

**Keep in mind this is for a custom set he built for me so it was designed for trail/crawling and other aftermarket springs may be different.

I also asked about a stock spring, and without knowing all the details he said -3 to 4 inches from ride height would be safe, but they may be able to take more.
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Old April 11th, 2012, 02:29 PM   #5
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the more you go, the faster they will wear out. YJ springs like to bend, you'll probably be replacing them fairly often if you wheel often.

I bent a lot of springs on my yj's, and the last one had lift springs.
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Old April 12th, 2012, 09:56 AM   #6
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I guess there are too many variables to get any kind of idea how long they will actually last going inverted.

So I'll ask this: If it was your rig, would you set the bump stops to limit up travel to where it is shown in the second pic or the third?
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