JKU onboard air - JK-Forum.com - The top destination for Jeep JK Wrangler news, rumors, and discussion

Notices

JKU onboard air

Reply

 
 
Old 01-10-2018, 06:05 PM
  #1
JK Newbie
Thread Starter
 
punkn's Avatar
 
Join Date: Nov 2011
Location: Sierra Vista, AZ
Posts: 6
Thanks: 0
Thanked 1 Time in 1 Post
Default JKU onboard air

Shortly before Christmas 2017 4WD had a sale on Smittybilt 5.65 cfm compressors. I bought 2 for $152.


These compressors only have an on/off switch and a 150psi blow off valve. Not friendly for an onboard air system. I removed the blow off valve and replaced it with a brass 1/4npt 2 nipple, a t, and a 120psi Viair pressure switch. I put a new 150psi blow off valve in the other leg of the t.

.Removing the switch end of the compressor reveals the wiring for the switch and the circuit breaker. There is a 60A relay between the switch and the compressor motor. I cut the wire from the relay and spliced in the leads from the pressure switch. Now the compressor will shut off at 120psi and restart at 90psi

Next I mounted the compressors, one on each fender well.




I removed the base plates from the compressors. 5/16 grade 5 bolts were used with some of the rubber from the original vibration mount. 2 bolt were used on one end and 4 bolts on the other end. On the long bolts I cut 3/8 iron pipe to the required length to let the compressors set level.
I wanted to operate the system from my S Pod

I ran #16 wire from the S Pod relay to the battery side of the engine compartment. It was hard to find a place for the relays. I settled on a small place by the air cleaner
.
I removed the air intake to allow access to mount the 2 80A relays. After mounting, the wires from the S Pod were attached. Then it was on to running the power to the compressors. I used #8 wire to the compressors. I cut off the alligator clips and used heat shrink butt splice connectors and marine adhesive lined shrink tubing. I removed the passenger rear seat belt and used ring end connectors and shrink tubing for both grounds. I used a Dremel tool with a wire wheel to remove paint for a good connection.
The 2 power wires were ran along the inside of the jeep under the kick panels and through the firewall using a grommet under the glove box. 2 Maxi fuses (40A) were installed for the final connection.



The air tank is mounted to the factory bar behind the rear set.

The bar is 1 x 3 square tube. Square u bolts secure a 2.5 gal Viair tank to the overhead. The dome light housing needed a bit of trimming as did the Styrofoam padding material. A npt 45, check valve, and npt x 3/8 push lock air fitting were installed. A small slit in the padding cover at each end allowed 3/8 push lock air hose to connect each compressor to the tank. I added a pressure gauge, tank drain, air chuck, and another 150psi blow off.



The 2 compressors in tandem pressurize the 2.5gal tank from 0 to 120 psi in less than a minute.
punkn is offline  
Reply With Quote
The Following User Says Thank You to punkn For This Useful Post:
doc5339 (01-11-2018)
Old 01-11-2018, 08:00 AM
  #2
JK Junkie
 
resharp001's Avatar
 
Join Date: Jun 2013
Location: Willow Park, TX
Posts: 2,150
Thanked 13 Times in 13 Posts
Default

Nice write up! All said and done how much you think you have in the system? Given the location of the compressors, do you still have plenty of access to reach that hard top bolt right being the rear door, or do you not remove the hard top much? Looks like close quarters in the pictures. The lines run from the compressors to the tank are hidden under the rollbar cover?
resharp001 is offline  
Reply With Quote
Old 01-11-2018, 08:36 AM
  #3
JK Freak
 
jchappies's Avatar
 
Join Date: Jul 2013
Location: Santee
Posts: 639
Thanks: 0
Thanked 1 Time in 1 Post
Default

thats a great deal on those compressors, i did the same thing with the pressure switch and mounted it in the rear of the JK. The only issue i have is i've gone through 2 of those compressors in the last few years. The last one lasted just over a year. I switched to an ARB so lets see how long that last. Funny thing is the compressors are only my back up as i mostly use CO2 so they don't get a whole bunch of time on them.
jchappies is offline  
Reply With Quote
Old 01-11-2018, 04:00 PM
  #4
JK Newbie
Thread Starter
 
punkn's Avatar
 
Join Date: Nov 2011
Location: Sierra Vista, AZ
Posts: 6
Thanks: 0
Thanked 1 Time in 1 Post
Default

As to how much invested into the system? $150 for the compressors. $75 for the tank. Maybe another $100 for the rest. So I would say $350 tops on the whole thing.
I haven't looked at the hardtop bolt yet. I am 70+ so I'm not going to be doing a lot of hardtop removal. The wife is pretty much set on heating and air conditioning without the dust.
Yes. The 3/8" plastic pushlock .air tubing is hidden by the roll bar cover. I unzipped the cover on the vertical section to figure out where to run the tubing. I just made a slit with a razor knife at each end and slid the tubing in, and then zipped it up.
The compressors sure fill the tank fast. I will have to time it on my 37's.
punkn is offline  
Reply With Quote
Old 01-16-2018, 06:40 AM
  #5
JK Newbie
 
theksmith's Avatar
 
Join Date: Feb 2017
Location: Phoenix
Posts: 11
Thanked 0 Times in 0 Posts
Default

innovative spot for the air tank, i like it!

on did you see any evidence of a thermal cut-off in the internal wiring when you had those Smittybilts apart?
theksmith is offline  
Reply With Quote
Old 01-17-2018, 12:21 PM
  #6
JK Newbie
Thread Starter
 
punkn's Avatar
 
Join Date: Nov 2011
Location: Sierra Vista, AZ
Posts: 6
Thanks: 0
Thanked 1 Time in 1 Post
Default

Originally Posted by theksmith View Post
innovative spot for the air tank, i like it!

on did you see any evidence of a thermal cut-off in the internal wiring when you had those Smittybilts apart?
There is a thermal breaker with reset button next to the on/off switch. The wiring has been updated recently. A 60 amp relay is now used as a switch circuit. Previously full current went through the switch.
punkn is offline  
Reply With Quote
 
 
 

Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
powrsurg
Modified JK Tech
41
10-10-2012 11:26 AM
Air Werkz
Sponsoring Manufacturers/Vendors - Check out Cyber Monday Specials!!
11
05-30-2012 05:39 PM
Flukinuki
Modified JK Tech
43
03-02-2008 05:11 PM
nissan300z90
JK Accessories & Misc Parts
6
07-02-2007 03:06 PM
aetcmh
Modified JK Tech
1
06-03-2007 06:45 PM

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -8. The time now is 12:49 PM.


 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: