On Board Air Tank w/ Impact Wrench

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Just checked the specs for the new ARB dual compressor.

100% Duty Cycle (at room temp)
Rapid inflation of small, medium and large tires.
Air tools rated up to 85LPM [3CFM] @ 6Bar [90PSI] continuous supply.
Air tools rated higher than 85LPM [3CFM] @ 6Bar [90PSI] using an optional air tank suitable to the run time requirements.

It looks like it will handle the job fairly well - even better with a small tank!
 
The big disadvantage of the pancake air tanks is the ports would be facing down assuming the feet were mounted to the crossmember.

The cylinder shaped tanks have ports on several sides of the tank to keep the line easily flowing and tucked up.
 
I really like the spare idea, curious to see what you come up with.
 
jasonbraswell said:
Did some searching to see the space available in the rear tire area and in this link https://forum.ih8mud.com/100-series-cruisers/76405-spare-tire-modifications.html you can see LOTS of room for an air tank. I am beginning to think a 2 gallon mounted to the rear cross member might work out great.

Also found a decent drawing pic to reference.
How does the crossmember mount idea sound?
I also like the idea of raising the crossmember in the same manner as the spare tire mod to tuck a tank a few more inches up into the hundy butt.
Click to expand...
If you move the spare you can ditch that whole piece, no need to move it up.
 
saillaw said:
That's awesome, thanks! I'm going to have to take a look at my MT sliders and see if there is a way to do this with them.
Click to expand...

I don't think you can do this with the MT sliders due to the fact that they have bulk heads along the length of the slider. However, I do not know if they are fully sealed/welded. You would have to give MT a call to confirm.
 
rusty_tlc said:
If you move the spare you can ditch that whole piece, no need to move it up.
Click to expand...

So the rear cross member is not needed to provide frame support?
 
The spare tire crossmember is indeed a structural frame support. I believe there are 9 in total. The lifted spare tire mod, as many do with spacers would also reduce it's effectiveness. By how much? Nobody knows.

My spare tire crossmember was removed in favor of an aux tank. I'm okay with that. I also figure the Slee bumper has added some support.
 
Yeah, I will be adding the Slee rear bumper also.
I believe it will provide adequate support when the cross member is removed.

Most folks continue to leave the rear cross member on after installing a new rear bumper, which is why I asked.
 
You know, you could just use that spare tire (preferably E-load and narrow width) as an air tank. It would double as a spare tire too! :hillbilly:
 
hoser said:
You know, you could just use that spare tire (preferably E-load and narrow width) as an air tank. It would double as a spare tire too! :hillbilly:
Click to expand...

Or my slider. Haha. that was a clever idea.

The spare is not going to have 750psi burst strength like a DOT approved air tank.:rolleyes:
 
hoser said:
The spare tire crossmember is indeed a structural frame support. I believe there are 9 in total. The lifted spare tire mod, as many do with spacers would also reduce it's effectiveness. By how much? Nobody knows.

My spare tire crossmember was removed in favor of an aux tank. I'm okay with that. I also figure the Slee bumper has added some support.
Click to expand...

I did not know that. It seems pretty flimsy to provide any kind of structural integrity.
 
Last edited:
"Kondo's team completely re-engineered the FJ80's ladder frame, adding three extra crossmembers (now nine) and beefing up the side rail structure. Each crossmember is set into the rails using new bracketry, which Toyota calls a flared-flange-type joint (see Illustration). Frame rail wall thickness has been increased to 3.2mm, and the boxed rails include internal stiffening plates welded within their front 48 inches. Kondo claims this helps maintain frame integrity during a frontal impact, keeping the front end from "folding up" into the passenger compartment.

Kondo says none of the Cruiser's frame components is hydroformed nor does any Toyota program currently use this increasingly popular method of metalforming (see June '97 AI, p. 57 and Dec. '97, p. 40). The new frame surpassed the benchmark Range Rover frame in bending and torsional rigidity, claims Kondo (he did not reveal actual frequencies), while boosting overall rigidity by 5096 versus the old FJ80's frame. The stiffer frame allows more compliant suspension bushings and body mounts, helping to improve the new Cruiser's ride comfort. Two types of body mounts are used: compression and lateral-restriction."

This picture is not from this article but it shows 9 cross members. :meh:
LC100laddeframe.webp
 
So how about dropping the tire support? There is a provision from the factory to drop the support which allows for installation of the factory Aux tank. The holes labeled B in the picture let you drop the cross member down enough to install the Aux tank, that space could be used for an air tank.
Holes.webp
 
hoser said:
One of these should be a good fit and you might not even need to move the crossmember.

Dimensions: 31" Long x 10" Diameter
Chassis Tech 9 Gallon Air Tank - 4 Ports

Dimensions: 34" Long x 7" Diameter
Firestone 5 Gallon Air Tank - 7 Ports
Click to expand...

Those are pretty big and maybe not necessary. ARB tells me 1 gallon is sufficient and I am just doubling their recommendation by going to a 2 gal. I also plan to plumb a cutoff valve to the tank so that it doesn't need to fill every time I want to just turn on lockers, put small amount of air in a tire, etc...

I think leaving the cross member is ideal even with a rear bumper from slee. Will have to wait and see when we get in there.
I don't want the tank visible from a walking by view and the higher it is tucked probably is best from a trail damage standpoint.
 
I've got a 2006 LC hundy and a new ARB On-Board High Performance 12 Volt Twin Air Compressor (CKMTA12) that I want to install with front and rear TJM air lockers. The AHC system has been removed so there is room under the hood. I haven't put in a second battery tray/system yet, but is a future mod I'm thinking about. Where did you mount the compressor? Do you have pics?
 
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