Show me your rear shock reservoirs

[TRDHULK]

My 35s hit my reservoirs when flexing. Show me your set up so I can get some ideas please

 

[YellowSnow]

That’s the price you pay for going 35s…go big or go home brah

 

[Saker]

My 35s hit my reservoirs when flexing. Show me your set up so I can get some ideas please

These were on my 14

 

[honda250xtitan]

i'm running 1.5" wheel spacers on the rears to clear the king hydralic bump stops and the king resi's. (mounted on the frame rail like all the king pics show) i cant imagine the clearance issues with a 35x12.5 lol

 

[TRDHULK]

i'm running 1.5" wheel spacers on the rears to clear the king hydralic bump stops and the king resi's. (mounted on the frame rail like all the king pics show) i cant imagine the clearance issues with a 35x12.5 lol

I already have -25 offset wheels so I dont want to space them out any more.

I see tons of people with the reservoirs mounted similar to mine. I guess its just the tires..

 

[dezertbomber]

I already have -25 offset wheels so I dont want to space them out any more.

I see tons of people with the reservoirs mounted similar to mine. I guess its just the tires..

Could you run them under the frame and mount them inboard, in front of the rear springs? Or turn the shock around and mount by the sway bar? Not sure how long the hoses are.

 

[Jetboy]

With longer hoses you can mount the reservoirs on top of the shock towers or anywhere else inside the engine bay that you want. I'll see if I can find it, but I did a write-up the hose and fitting size you need for Fox suspension. Mine are still under the wheel well. If my memory is correct for king and icon and most others they use crimped hose fittings. The fox suspension I have uses reusable hose fittings which means you can just order some extra hose and DIY it, assuming you can pop the shocks out and refill them and recharge them yourself. One of those little things that most people don't ever need, but Fox goes a little bit extra on the factory series over the mid-grade king and icon setups. It's a little bit of an oddball size if I remember correctly for the fittings. My local hydraulic supply shop didn't have any. But I was able to order it online pretty easily. If I can't find the thread, I'll just run out to my shop later and look what size it is. I still have about 6 ft leftover.

 

[honda250xtitan]

I already have -25 offset wheels so I dont want to space them out any more.

I see tons of people with the reservoirs mounted similar to mine. I guess its just the tires..

yea, run them on the inside of the frame rail then. big boy tires = big boy problems? lol

 

[dezertbomber]

With longer hoses you can mount the reservoirs on top of the shock towers or anywhere else inside the engine bay that you want. I'll see if I can find it, but I did a write-up the hose and fitting size you need for Fox suspension. Mine are still under the wheel well. If my memory is correct for king and icon and most others they use crimped hose fittings. The fox suspension I have uses reusable hose fittings which means you can just order some extra hose and DIY it, assuming you can pop the shocks out and refill them and recharge them yourself. One of those little things that most people don't ever need, but Fox goes a little bit extra on the factory series over the mid-grade king and icon setups. It's a little bit of an oddball size if I remember correctly for the fittings. My local hydraulic supply shop didn't have any. But I was able to order it online pretty easily. If I can't find the thread, I'll just run out to my shop later and look what size it is. I still have about 6 ft leftover.

I guess it wouldn't matter unless you were running higher speed terrain, but this setup is cooking the reservoirs and the oil inside. Usually you want them to have outside air run over them to help dissipate heat, this is doing the exact opposite.

 

[Jetboy]

I guess it wouldn't matter unless you were running higher speed terrain, but this setup is cooking the reservoirs and the oil inside. Usually you want them to have outside air run over them to help dissipate heat, this is doing the exact opposite.

The reservoirs don't really add much meaningful heat dissipation. There's not enough volume of flow in and out of the reservoirs. Most of the time there's not much oil in the reservoir anyway. It's mostly nitrogen. Primary function they have is to reduce the pressure change through the stroke of the shock shaft by allowing a larger gas volume. Almost all of the heat dissipation happens in the shock bodies. On the vehicle I used that picture from, If I remember right there running dual 3.5" shocks at each corner. So I don't think overheating is much of an issue anyway.

In the 4R nothing you can do with 8 in of travel is going to overheat a 2.5 in shock. And my experience I would say it's effectively impossible to even get them up to ideal operating temperature of 300*F. So maybe insulating the shocks might be a better option than trying to cool them?

I'm not saying you're wrong that they're not in a great location for cooling. Just that it might be an okay compromise location. They've won the stock class Baja 1000 multiple times with that truck. So I'd guess it works okay.

Also - what about showing off the expensive reservoirs?

 

[daytonaviolet]

295/70/17 -38mm

 

[dezertbomber]

The reservoirs don't really add much meaningful heat dissipation. There's not enough volume of flow in and out of the reservoirs. Most of the time there's not much oil in the reservoir anyway. It's mostly nitrogen. Primary function they have is to reduce the pressure change through the stroke of the shock shaft by allowing a larger gas volume. Almost all of the heat dissipation happens in the shock bodies. On the vehicle I used that picture from, If I remember right there running dual 3.5" shocks at each corner. So I don't think overheating is much of an issue anyway.

In the 4R nothing you can do with 8 in of travel is going to overheat a 2.5 in shock. And my experience I would say it's effectively impossible to even get them up to ideal operating temperature of 300*F. So maybe insulating the shocks might be a better option than trying to cool them?

I'm not saying you're wrong that they're not in a great location for cooling. Just that it might be an okay compromise location. They've won the stock class Baja 1000 multiple times with that truck. So I'd guess it works okay.

Also - what about showing off the expensive reservoirs?

Application dependent. Yes, 4R's aren't pushed hard enough to matter much (I'm actually seeing if I can get away with 6112's and just swapped rear 5160's for Ironman FCP's due to valving needs for HD springs), but discounting reservoirs' cooling benefits is categorically wrong. Fox and King have only increased reservoir cooling tech due to this benefit.

What truck is the stock racer? Let's be honest, stock class is all about who's truck doesn't fall apart! (Ok, that's all classes lol). Built a 1450 Toyota with a buddy and had an eye opening (also back breaking) learning experience on cavitation. Halfway thru first of four laps our rear King piggy backs were toast. Slammed the rear so much it bent the housing til it was seeping. After we added bypasses, it never happened again. You can see how the piggy backs being such a small reservoir and right behind the cab prevented airflow and thus insufficient cooling. We played with that truck for years before racing without ever having that happen.

Back to the OP. TRDHulk, what shocks you have? Let's see some pics of your setup as it'll help us see what your options are.

 

[ahtoxa11]

i'm running 1.5" wheel spacers on the rears to clear the king hydralic bump stops and the king resi's. (mounted on the frame rail like all the king pics show) i cant imagine the clearance issues with a 35x12.5 lol

You're rubbing them with 285s? I run Kings with rears mounted the same way - along the frame rails. I have 285 KO2s with OEM PRO wheels and I don't have any rub.

 

[Jetboy]

Reservoirs can help with cooling in some situations. I just don't think that it's a primary function to use the reservoir body as a liquid/air heat transfer radiator. Smooth body reservoir would be a really terrible design if that's the goal. The cooling is ancillary to the primary functions.

I think the rough math on maximum possible cooling from the reservoirs in this case would be something like 15% or so. The res probably increases oil capacity in the shock main body by about 20% and maybe another 15% in the res body. But then we'd probably reduce by some factor - due to the relatively small pumping volume transfer - not much oil is exchanging between the main body and the reservoir unless they're running a double hose setup with a check valve like some newer Fox setups or they are a piggyback where there's a significant fluid exchange. In our case there's just not much transfer of fluid or thermal energy. And the longer the hose the less thermal transfer. The hose its self probably has more cooling effect than the reservoir. The lion's share of cooling benefit in our case is from having more oil in the main shock body and lower internal pressure spikes.

I'd put the reservoir anywhere you want and not think twice about the cooling value.

 

[honda250xtitan]

You're rubbing them with 285s? I run Kings with rears mounted the same way - along the frame rails. I have 285 KO2s with OEM PRO wheels and I don't have any rub.

not rubbing but itd be wicked tight. the TC bump stop brackets for the king bumps stick out farther than the shock resi's.

 

[honda250xtitan]

Reservoirs can help with cooling in some situations. I just don't think that it's a primary function to use the reservoir body as a liquid/air heat transfer radiator. Smooth body reservoir would be a really terrible design if that's the goal. The cooling is ancillary to the primary functions.

I think the rough math on maximum possible cooling from the reservoirs in this case would be something like 15% or so. The res probably increases oil capacity in the shock main body by about 20% and maybe another 15% in the res body. But then we'd probably reduce by some factor - due to the relatively small pumping volume transfer - not much oil is exchanging between the main body and the reservoir unless they're running a double hose setup with a check valve like some newer Fox setups or they are a piggyback where there's a significant fluid exchange. In our case there's just not much transfer of fluid or thermal energy. And the longer the hose the less thermal transfer. The hose its self probably has more cooling effect than the reservoir. The lion's share of cooling benefit in our case is from having more oil in the main shock body and lower internal pressure spikes.

I'd put the reservoir anywhere you want and not think twice about the cooling value.

nobody is mounting them on the frame rail for cooling issues, it looks cool

 

[carlodonz]

Here is my setup

 

[mrblah]

My 35s hit my reservoirs when flexing. Show me your set up so I can get some ideas please

is it both sides or just the driver side or passenger side?

 

[TRDHULK]

is it both sides or just the driver side or passenger side?

Mine hit on both sides when I flexed.

I think I fixed it.

 

[Saker]

Mine hit on both sides when I flexed.

I think I fixed it.

Pics please of fixed resi’s!