The FRF Shock Shootout! All pre event details and discussion here

[BigJ]

Makes total sense all except for the fact that hitting a hydraulic bumpstop with no nitrogen would be like punching a brick wall with your fist.....There is no protection!!

Totally agreed. We are definitely on the same page here. I'm just thinking at least we'll have that rubber/polymer foot taking the brunt. Even if it doesn't offer any resistance while the stop collapses, and doesn't give at all at full compression and the whole thing just slams down to a rigid hard stop, I have to assume a metal plate hitting a rigid rubber/polymer foot is still better than metal parts slamming into other metal parts.

Unfortunately we (ICON) have done no direct testing with leaf springs or bump stops to this point, so we can not give a recommendation....psi is just one piece of the pie when you talk about proper tuning a bump stop to work in conjunction with a shock. We are very technical over here and do not just wing it, and simply adjusting the psi level is def...well....winging it. You would not get an accurate analogy of our product.

Ok understood. If I were to paraphrase, you would tell this customer to air the stops down to some nominal level (zero) or just get rid of them all together. Is that a fair summary?

 

[BIRDMAN]

J I believe the bumpstop pads are Delrin which is known for its stiffness. I could be wrong but I don't believe that metal/Derlin is any better than metal/metal as far as the two hitting. If the bumps are aired down to zero and the bump contact pad happens to slam in to the axle pad it's not going to offer any give.

 

[BigJ]

Could be Delrin Bird. I'm not sure and I guess it would depend on who makes the stop.

But no matter; I'll still take it over metal on metal contact. Who's to say where one metal bit meets another can take the pounding? Even at a hard stopped stop we know its been designed to hit there and in that way, at least.

 

[justvettn]

BigJ, just wondering if you are now planning to run all three sets of shocks the same way.

 

[BIRDMAN]

Could be Delrin Bird. I'm not sure and I guess it would depend on who makes the stop.

But no matter; I'll still take it over metal on metal contact. Who's to say where one metal bit meets another can take the pounding? Even at a hard stopped stop we know its been designed to hit there and in that way, at least.

Where does metal to metal come in to play here? I thought we were talking stock bumps vs air bumps @ 0psi

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[BigJ]

BigJ, just wondering if you are now planning to run all three sets of shocks the same way.

Yep, that's still the plan.

The question I still have is if we'll end up testing each shock in multiple ways. TBD on that.

Where does metal to metal come in to play here? I thought we were talking stock bumps vs air bumps @ 0psi

Huh? You mentioned Delrin footed bumpstop at full compression hitting a strike plate was no better than metal on metal contact somewhere else, right?

We're talking about what to do *IF* the truck I end up being offered for use already has an after market bump stop solution (likely if I had to guess). The stock stop isn't an option in that case. So I'm saying leave the after market stop in place, but air it down to zero. That way if the axle ever gets to a point where a stop is needed (hopefully not) at the very least we'll have Delrin on strike plate contact, and not the metal on metal contact in some unknown place that would result if we had removed that stop all together.

Make sense?

 

[Maxx2893]

Where does metal to metal come in to play here? I thought we were talking stock bumps vs air bumps @ 0psi

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I believe he is talked air bumps at 0 vs. air bumps uninstalled with no bumps what so ever.

 

[BIRDMAN]

Yep, that's still the plan.

The question I still have is if we'll end up testing each shock in multiple ways. TBD on that.
Huh? You mentioned Delrin footed bumpstop at full compression hitting a strike plate was no better than metal on metal contact somewhere else, right?

We're talking about what to do *IF* the truck I end up being offered for use already has an after market bump stop solution (likely if I had to guess). The stock stop isn't an option in that case. So I'm saying leave the after market stop in place, but air it down to zero. That way if the axle ever gets to a point where a stop is needed (hopefully not) at the very least we'll have Delrin on strike plate contact, and not the metal on metal contact in some unknown place that would result if we had removed that stop all together.

Make sense?

Right, and I am saying a Delrin strike pad vs axle strike plate should not be considered a feasible alternative because Delrin will not deform and at the end of the day it's really no better than metal on metal...not that we want that either.

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[justvettn]

In Icon's post they said something to the degree that airing down the bump would be equivalent to having no bump and that you would be much better off using OEM bumps. From what I understand to be fair to Icon and the test results all three sets of shocks would have to be run using factory bumps and factory springs. Frame bracing not a problem.

 

[pirate air]

Not much of an impulse change between delrin and metal bump pad. Both are going to hit pretty hard when slammed into the strike pad. I still believe opening up the bump and limiting the travel is a better option. Limit travel (about 1 1/2 ish inch) to what the factory bump stop would have so that the point of contact when the suspension compresses is the same as what the factory set up would do. This would give the shocks the most room to work with while emulating the factory set up. Completely removing the bumps would be a disaster resulting in a bunch of damaged shocks.