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Fox IFP shock life

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Mulely

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What's everyone seeing for life/miles on the Fox IFP shocks?
I got about 50k-ish on mine and get weird wiggles every so often and it rides odd.
37s if it matters for tire size.

-Dave
 
I can't find the paper that came with them.
But I think it was rebuild every 25K miles. 10K for off road use.
 
You can't check it without taking them apart. But at 50K, it's probably way pass the oils life.
I've rebuilt a set of Kings before. Hardest part was finding a place to recharge the nitrogen.
Remote resi shocks are easier than the IFP.
 
you could have a clapped out shock. A loss of nitrogen could be noticeable especially with the odd suspension characteristics these trucks already have. Shock oil doesn’t really have a life expectancy but it should be changed when the shock is rebuilt. Typically on a life durability cycle the shock loses less than 10% of its dampening over its lifetime due to oil breaking down. Wouldn’t see a drastic change unless it leaks. Shocks can leak oil out or nitrogen out or leak internally and mix. shocks can lose nitrogen through a worn o ring or through a damaged fill port.

If you pull the suspected shock and compress it and it doesn’t push back out, you’ve lost your nitrogen. I’m not sure how to tell from external inspection if you lost an ifp seal and you have aerated oil I’ll try to get back to you on that
 
Rockcrawlindude said:
you could have a clapped out shock. A loss of nitrogen could be noticeable especially with the odd suspension characteristics these trucks already have. Shock oil doesn’t really have a life expectancy but it should be changed when the shock is rebuilt. Typically on a life durability cycle the shock loses less than 10% of its dampening over its lifetime due to oil breaking down. Wouldn’t see a drastic change unless it leaks. Shocks can leak oil out or nitrogen out or leak internally and mix. shocks can lose nitrogen through a worn o ring or through a damaged fill port.

If you pull the suspected shock and compress it and it doesn’t push back out, you’ve lost your nitrogen. I’m not sure how to tell from external inspection if you lost an ifp seal and you have aerated oil I’ll try to get back to you on that
Click to expand...
I appreciate the info!
 
Thru the heat cycles of the shocks, your saying they only loose 10%.

But Fox says to rebuild them at 25K I beleive.

Yea, not sure how you can check the IFP to see if it leaks. Other than find a place that can recharge them. Remove the plug where you charge it, release the nitrogen and see if any oil comes out. If not, then have the recharge it. Also have them check the pressure before they release any to see if it's low.

That's about the only way I can think of.
 
I know remote resi shocks are charged to 250 to 300 PSI.
Not sure about IFPs, but as hard as they are to compress, I'd assume it's the same.
 
Crusty old shellback said:
Thru the heat cycles of the shocks, your saying they only loose 10%.

But Fox says to rebuild them at 25K I beleive.

Yea, not sure how you can check the IFP to see if it leaks. Other than find a place that can recharge them. Remove the plug where you charge it, release the nitrogen and see if any oil comes out. If not, then have the recharge it. Also have them check the pressure before they release any to see if it's low.

That's about the only way I can think of.
Click to expand...
Fox manual recommends 50,000 miles for street use. I have yet to see a single HD ram on this forum being used in a manner that would require 10k or even 25k mile shock rebuilds. “Motorsports use” is not occasional slow trail riding. The one Hd Ram I have seen jumping stuff was in a carli advertisement and they were running 3” kings with resis which we aren’t talking about here.

If I was unclear I apologize but I did not say they lose 10% through heat cycles. When Fox does lifecycle durability testing on their shocks, they bolt the shock into their test rig and run the shock 24 hours a day millions of cycles for the lifespan the shock is intended for and they see a <10% change in dampening from start to end of shock life, assuming no leaks or breakages.
 
Mulely said:
I found that page today poking around their website as well. Looks like I'm buying a set and I'll send out the worn ones for a rebuild later on.
Click to expand...
Might want to check their price on a rebuild. :oops:
Or find a local shop to rebuild them.
 
Is the Fox reservoir shocks from Thuren worth the extra coin for a pavement princess? I have all their parts minus arms and it sorta sees dirt roads and 2 tracks a few times a year.
 
Only thing I can think of is there may be more shock travel since the floating piston is now in the resivour rather than taking up room in the top of the shock body.
 
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