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post #1 of 26 Old 07-13-2014, 04:11 PM Thread Starter
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twin ARB

Installed twin ARB compressor and m.o.r.e.engine mount. The install was kinda a pain when it comes to the mounting bracket. Being a plumber with big hands sucked getting bolts in. I also bought the Spod harness.. I will say it's useless unless running air lockers. You can just tie into the black and purple line and run those two right to spod.
As far as the compressor I ran the 1/8" tubing for air gauge on spod and 3/8" hose. With heat protection wrap to inside front bumper for disconnect. Bought a 25' no kink hose it reaches all four tires easily. Aired down a tire to 18 psi like I would on trail. It took 1 min 15 sec to air back to 38 psi.
I will at some point run air to rear and install a tank sonewhere. The ARB twin has a built in switch that stops it at 150 psi.. (nice)!.
Overall I say both the spod and twin compressor were smart choices and am very happy. I had the 12 v portable compressor from harbor freight it would take 4 min to air a tire and shut off due to over heating after 2 tires for 30 min.. I had to do something better..







Any questions on either install just ask.

2014 jk oscar mike edition. Manual. 3.5" Rubicon super flex suspension lift. 35" AT tires 17" method rims. Body armor doors. Smitty built MOD front bumper. Smittybilt 9500 lb winch, ARB twin compressor, Spod with gauge, D2 LED's.

Last edited by bass5money; 07-14-2014 at 07:55 AM.
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post #2 of 26 Old 07-14-2014, 07:57 AM Thread Starter
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pic of moved d2's.

2014 jk oscar mike edition. Manual. 3.5" Rubicon super flex suspension lift. 35" AT tires 17" method rims. Body armor doors. Smitty built MOD front bumper. Smittybilt 9500 lb winch, ARB twin compressor, Spod with gauge, D2 LED's.
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post #3 of 26 Old 07-16-2014, 07:05 PM
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Have a friend doing the twin ARB...looks really nice and sounds like it performs well. I'm using the ViAir currently but may swap out if the performance is as much better as it sounds to be.

We've build a set of hoses that allow us to air down or up all four tires at once. Its been really nice vs doing one by one.

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post #4 of 26 Old 07-16-2014, 10:29 PM Thread Starter
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I seen that on a vid on you tube..nice..

2014 jk oscar mike edition. Manual. 3.5" Rubicon super flex suspension lift. 35" AT tires 17" method rims. Body armor doors. Smitty built MOD front bumper. Smittybilt 9500 lb winch, ARB twin compressor, Spod with gauge, D2 LED's.
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post #5 of 26 Old 07-16-2014, 11:31 PM
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Originally Posted by bass5money View Post
Aired down a tire to 18 psi like I would on trail. It took 1 min 15 sec to air back to 38 psi.
Consider airing down to 12 psi on the trail (and airing back up to 28 psi on the street if on 35s).
38 psi may be a good street pressure for you, but 18 is much higher than you need on the trail (YMMV).

12 is pretty safe without worrying about losing a bead, and your ride quality, traction, and flotation will be night-and-day better.
If the idea of 12 psi freaks you out, at least try 14 or 15. HUGE difference. Just don't hit the highway aired down.

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post #6 of 26 Old 07-17-2014, 08:08 AM Thread Starter
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12 WITHOUT BEAD LOCKS?

2014 jk oscar mike edition. Manual. 3.5" Rubicon super flex suspension lift. 35" AT tires 17" method rims. Body armor doors. Smitty built MOD front bumper. Smittybilt 9500 lb winch, ARB twin compressor, Spod with gauge, D2 LED's.
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post #7 of 26 Old 07-17-2014, 08:16 AM Thread Starter
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GOOD READ ON INFLATION AND DEFLATION OF TIRES:
http://arbusa.wordpress.com/2011/10/...ire-pressures/

2014 jk oscar mike edition. Manual. 3.5" Rubicon super flex suspension lift. 35" AT tires 17" method rims. Body armor doors. Smitty built MOD front bumper. Smittybilt 9500 lb winch, ARB twin compressor, Spod with gauge, D2 LED's.
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post #8 of 26 Old 07-17-2014, 08:22 AM Thread Starter
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My tires say 50 psi max I do 38 on road, if I set them below 35 my low tire lights bug the crap out of me all the time..

2014 jk oscar mike edition. Manual. 3.5" Rubicon super flex suspension lift. 35" AT tires 17" method rims. Body armor doors. Smitty built MOD front bumper. Smittybilt 9500 lb winch, ARB twin compressor, Spod with gauge, D2 LED's.
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post #9 of 26 Old 07-17-2014, 09:20 AM
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12 WITHOUT BEAD LOCKS?
Yep.
EDIT: I'll fawk with you about other stuff, but never about tech. questions.

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Originally Posted by bass5money View Post
My tires say 50 psi max I do 38 on road
Chalk test is the best way to know what your tires need on-road.
Higher PSI = fuel economy at the expense of ride quality and traction.

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. . . if I set them below 35 my low tire lights bug the crap out of me all the time..
I don't know about the newer Jeeps, but on my '10 I used a Superchips programmer to set the TPMS to 26 psi.

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Last edited by ExWrench; 07-17-2014 at 09:36 AM.
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post #10 of 26 Old 07-17-2014, 12:16 PM Thread Starter
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yup 2014 any tire below 35 it bugs the crap out of you.. I wish i could change it.,

2014 jk oscar mike edition. Manual. 3.5" Rubicon super flex suspension lift. 35" AT tires 17" method rims. Body armor doors. Smitty built MOD front bumper. Smittybilt 9500 lb winch, ARB twin compressor, Spod with gauge, D2 LED's.
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post #11 of 26 Old 07-17-2014, 12:38 PM
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yup 2014 any tire below 35 it bugs the crap out of you.. I wish i could change it.,
ProCal, Superchips FlashCal - both are compatible with 07-14 vehicles and allow for lowering the TPMS value to resolve the low pressure alert.

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post #12 of 26 Old 07-17-2014, 01:18 PM
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yup 2014 any tire below 35 it bugs the crap out of you.. I wish i could change it.,
You can. I'm sure you, can get an aftermarket programmer to set the threshold for minimum tire pressure down from 35. AEV comes to mind but thee are probably others as well.

Now, what are your tires and what is the load range? If they are D or E, the 50 psi max makes sense, as they are a heavier tire meant for hauling and having serious weight put on them. As such, the sidewalls are stiffer because they have more plys. Chalk test is the only way to be sure that you are at optimal street pressure for wear and performance.

Off road, drop those pressures down. I run 13 psi offroad with load range C 33's on 15" rims. Even running an all terrain tire, the grip is phenomenal compared to street pressure. When you can look at the tire and watch it fold around a rock is when you're low enough. Almost more impressive than the traction is the comfort. At street pressure the rough trails throw you around the cab. With them dropped around 13, they are pillows and the ride is a lot more enjoyable.

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Rock Krawler Stock Mod w/ Fox Evolution 2.0's - 36 X 12.5 X 15" Interco TSL's on Black Steel wheels - Rock Krawler track bars front and back - Poison Spyder Customs BFH front bumper w/ Brawler bar - Warn HS9500i winch w/ synthetic rope - Trail Head Deflators - Viair 440P Compressor Instagram: jeepethan
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post #13 of 26 Old 07-17-2014, 01:56 PM
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twin ARB

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Originally Posted by bass5money View Post
12 WITHOUT BEAD LOCKS?

All day long. I run 12 and sometimes 10 off road. Never busted a bead, burped a little air now and then but that's no biggie.

37x12.5 MTR on 17x8" wheels

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post #14 of 26 Old 07-17-2014, 02:01 PM
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I've run the stock KM's down to 12 and the only issue I had was crap getting between the bead and the wheel causing a slow leak. Otherwise, no problems.

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post #15 of 26 Old 07-17-2014, 04:41 PM
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I use a Superchips FlashCal... I run 28psi on road (35" BFG AT/KO on a JKUX) so I set my TPMS to 25.... easy-peasy

I can't imagine running 38psi in a 35" AT on pavement... must be one hell of a harsh ride, especially on a 2dr!

Like ExWrench said, do a "Chalk test" & adjust psi accordingly.
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post #16 of 26 Old 07-17-2014, 10:12 PM
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Quote:
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Now, what are your tires and what is the load range?.
THIS ^^^
Quote:
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If they are D or E, the 50 psi max makes sense, as they are a heavier tire meant for hauling and having serious weight put on them. As such, the sidewalls are stiffer because they have more plys.
That explains the max. psi number on the sidewall, but in no way indicates a need for more air pressure.

I'm on 35x12.50/17 Nitto Trail Grapplers, which (unfortunately) only come in load range E.
The sidewall has "65 psi" on it, but you're high on glue if that number means anything to you in a JK.

I run 26-28 psi on the street, same as I did with same size Goodyear MTR/Ks on a 2 door with weight from bumpers, skids, and gear.
Those MTR/Ks were evenly worn across the tread at 30% depth remaining after 33K+ miles with 5-tire rotations every ~3K miles.


Quote:
Originally Posted by 2Door View Post
Almost more impressive than the traction is the comfort. At street pressure the rough trails throw you around the cab. With them dropped around 13, they are pillows and the ride is a lot more enjoyable.
In the last week of June, I spent a couple of days at 8 psi (have beadlocks) - it was heaven!
Washboard, ruts, and rocks smaller than a fist? Might as well have been watching 'em on TV.
Little marshmallowy at 8 psi in "fast" (~30 mph) turns, but I aired back up before driving like an asshole.


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I can't imagine running 38psi in a 35" AT on pavement... must be one hell of a harsh ride, especially on a 2dr!

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. . . do a "Chalk test" & adjust psi accordingly.
OR . . . tell us what tires you're running
We can definitely get you in the ball park (or at least have fun arguing over a few psi ).

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post #17 of 26 Old 07-17-2014, 11:38 PM
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The difference between 12 and 8 psi on my mtr/k c load is amazing . Hit a tree at 8 psi stayed on the bead drove all the way back to south lake from observation before I even found that .
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post #18 of 26 Old 07-18-2014, 08:04 AM Thread Starter
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OK tires are: BFG MT/TA 35 x12.5 R17 LT... says load range D max load 3000lb. I have 17"x8.5" rim
GVW 4900lb added stubby front bumper and winch, will be adding oil/tranny skid, rock rails, rear bumper/tire carrier.

2014 jk oscar mike edition. Manual. 3.5" Rubicon super flex suspension lift. 35" AT tires 17" method rims. Body armor doors. Smitty built MOD front bumper. Smittybilt 9500 lb winch, ARB twin compressor, Spod with gauge, D2 LED's.

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post #19 of 26 Old 07-18-2014, 08:19 AM Thread Starter
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Weight of Jeep
--------------------------- x Max tire PSI as indicated on sidewall
Tire max load rating (lbs)
multiplied by 4

that sound right??

So my GVW is 4900 lb add mods 400lb 2 people 400lb thats 5700 lb devide by 12000= .475 X 50 (max tire psi)= 23.75 psi road use??

google is nice....if thats right

2014 jk oscar mike edition. Manual. 3.5" Rubicon super flex suspension lift. 35" AT tires 17" method rims. Body armor doors. Smitty built MOD front bumper. Smittybilt 9500 lb winch, ARB twin compressor, Spod with gauge, D2 LED's.
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post #20 of 26 Old 07-18-2014, 08:49 AM
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YOu cannot simply rely on the math for that. As everyone else stated the best way is to do a chalk test on your tires.

Also since it looks like you might be a little new with the jeep computer system, look up steering wheel fabs. There are ways to totally turn your traction control, abs, and other things off in your jeep that you do not want to be using automatically offroad. Actually all the JKs have this that many people do not know about.
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post #21 of 26 Old 07-21-2014, 12:10 PM
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Quote:
Originally Posted by ExWrench View Post
THIS ^^^

That explains the max. psi number on the sidewall, but in no way indicates a need for more air pressure.

I'm on 35x12.50/17 Nitto Trail Grapplers, which (unfortunately) only come in load range E.
The sidewall has "65 psi" on it, but you're high on glue if that number means anything to you in a JK.
Sorry, yes, the sidewall is what I was referring to. And yes, also true that the sidewall means nothing in a JK. What I meant was that the max isn't really worth mentioning.

OP, best suggestion is to get out offroad and experiment. Try them at 14. Then maybe 12. I've found my sweet spot at 13.5. I run an all terrain tire in the D range, so my tires are fairly flexy. Offroad they ride beautiful. Last weekend while driving to a spot to air down at the trail head, I was driving on a dirt road. The ride was so noticeable that I couldn't wait to get out drop the pressure. Your mud terrains are probably new too, so the sidewalls may be a bit stiff still. Drop them to around 14 and drive an easier trail just to experiment. If the sidewalls aren't bagged out before hitting the trail, let some more out.

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Rock Krawler Stock Mod w/ Fox Evolution 2.0's - 36 X 12.5 X 15" Interco TSL's on Black Steel wheels - Rock Krawler track bars front and back - Poison Spyder Customs BFH front bumper w/ Brawler bar - Warn HS9500i winch w/ synthetic rope - Trail Head Deflators - Viair 440P Compressor Instagram: jeepethan
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post #22 of 26 Old 07-22-2014, 10:40 AM Thread Starter
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ok ran a hard trail yesterday aired down to 14 and had no issues, a easier trail i'll do 12. aired back up to 33 instead of 38 and feels much better on rd.

2014 jk oscar mike edition. Manual. 3.5" Rubicon super flex suspension lift. 35" AT tires 17" method rims. Body armor doors. Smitty built MOD front bumper. Smittybilt 9500 lb winch, ARB twin compressor, Spod with gauge, D2 LED's.
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post #23 of 26 Old 07-22-2014, 10:49 AM
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ok ran a hard trail yesterday aired down to 14 and had no issues, a easier trail i'll do 12. aired back up to 33 instead of 38 and feels much better on rd.
Mansfield is moderate trail at best.

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post #24 of 26 Old 07-22-2014, 10:51 AM
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ok ran a hard trail yesterday aired down to 14 and had no issues, a easier trail i'll do 12. aired back up to 33 instead of 38 and feels much better on rd.
I would say do 12 psi on a harder trail. The tougher the trail the more you want full use of those aired down tires.

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post #25 of 26 Old 07-22-2014, 09:12 PM Thread Starter
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Mansfield was way worse then all the videos I've seen on it. They said the storms really changed it. The bypasses are gone washed out.

2014 jk oscar mike edition. Manual. 3.5" Rubicon super flex suspension lift. 35" AT tires 17" method rims. Body armor doors. Smitty built MOD front bumper. Smittybilt 9500 lb winch, ARB twin compressor, Spod with gauge, D2 LED's.
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