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Offline Flyin6

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Re: Hummer H2 SUT Build
« Reply #50 on: September 22, 2014, 01:28:29 PM »
Stock manifolds and LT headers
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Offline Flyin6

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Re: Hummer H2 SUT Build
« Reply #51 on: September 22, 2014, 01:29:05 PM »
Here's all the Dyna-Tech pieces/parts you get with the headers and Y-Pipe
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Offline Flyin6

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Re: Hummer H2 SUT Build
« Reply #52 on: September 22, 2014, 01:29:37 PM »
Right side header installed viewed through the fender well
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Offline Flyin6

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Re: Hummer H2 SUT Build
« Reply #53 on: September 22, 2014, 01:30:24 PM »
New Y-Pipe is tucked up as far as it will go, but still hangs down enough to require spacing of UCP
Site owner    IS 6:8  Psalm 91 
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Offline Flyin6

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Re: Hummer H2 SUT Build
« Reply #54 on: September 22, 2014, 01:31:12 PM »
UCP spacers were 1" long and required new longer bolts which were not supplied with the "kit"

After looking at the way it all fits, and the flimsly stock UCP, in the near future I will create a new skip plate out of 1/8" and 3/16" plate steel with topside reinforcements
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Offline Flyin6

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Re: Hummer H2 SUT Build
« Reply #55 on: September 22, 2014, 01:31:47 PM »
Drivers side header viewed from above
Site owner    IS 6:8  Psalm 91 
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Offline Flyin6

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Re: Hummer H2 SUT Build
« Reply #56 on: September 22, 2014, 01:32:45 PM »
Passenger side header viewed from above and looking under the Volant air tube

Overall impressions are:

1. This is a quality product that has been thourghly designed and thought out
2. Installation was easy only taking about a day working by myself and not rushing.
3. I noticed an immediate seat of the pants difference with regard to accleration.
4. Fuel economy improved. I now get a combined city highway, country road (with plenty of hills) mileage of 12.5-12.7
5. The only down side if you would consider it as such was that the Y-Pipe hangs down too low and should be bent to tuck up an inch or so higher. It really isn't much of a concern, but that would have made this product a solid 10 instead of a 9 point something.
Site owner    IS 6:8  Psalm 91 
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Offline Flyin6

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Re: Hummer H2 SUT Build
« Reply #57 on: September 22, 2014, 01:37:57 PM »
OK, moving right along

Now the big horsepower sucking factory fan will be replaced with Silverado heady duty electric fans
Site owner    IS 6:8  Psalm 91 
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Offline Flyin6

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Re: Hummer H2 SUT Build
« Reply #58 on: September 22, 2014, 01:39:08 PM »
I finally had the time and the courage to tackle the conversion from the huge mechical fan to the later electric fans. Here are the before and after photos...

Sorry for the blurry shot of stock, but who cares, everyone already knows what the stocker looks like!
Site owner    IS 6:8  Psalm 91 
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Offline Flyin6

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Re: Hummer H2 SUT Build
« Reply #59 on: September 22, 2014, 01:40:31 PM »
First, everything comes out. More easily said than done! The 36mm nut on the pressed on water pump pulley requires enormous force to remove, and mine came off in a normal fashion, not opposite thread like I would have thought. It required a special spanner wrench for the H2O pump pulley
Site owner    IS 6:8  Psalm 91 
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Offline Flyin6

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Re: Hummer H2 SUT Build
« Reply #60 on: September 22, 2014, 01:41:37 PM »
Here's a comparo of the various fan shrouds. Pictured is the factory fan and shroud, the shroud for the 2500HD truck, and a shroud for the 2008 H2, which I did not use. The H2 shroud has a plastic shield behind the electric motors and in my case improperly indexes the factory 2500 HD electric motors.
Site owner    IS 6:8  Psalm 91 
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Offline Flyin6

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Re: Hummer H2 SUT Build
« Reply #61 on: September 22, 2014, 01:42:16 PM »
Here's some of the parts you will need:
You need a 2500 HD shroud, 2ea motors and 2ea fans
OR
2008 Hummer H2 shroud, the two different H2 fans, and the two different H2 fans
Plus
Nelson Performance wiring harness
Zip Ties
2 feet of 1/2" I.D. Flexible oil line
8 ea 1/2" hose clamps
Oh, did I mention the water pump pulley special tool?????

You do not need the two pictured GM connectors. They are included on the Nelson Perf harness
Site owner    IS 6:8  Psalm 91 
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Offline Flyin6

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Re: Hummer H2 SUT Build
« Reply #62 on: September 22, 2014, 01:43:08 PM »
Next. carefully cut the factory oil lines and install the 12" flexible hose between the cut ends. I cut just prior to the bends where the line exits the radiator. Install 2ea hose clamps on each end and tighten
Site owner    IS 6:8  Psalm 91 
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Offline Flyin6

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Re: Hummer H2 SUT Build
« Reply #63 on: September 22, 2014, 01:43:57 PM »
Next install the fan shroud with the new isolators with the fan motors and fans assembled. I used #10 X 24 X 1.5" Stainless hardware to install the motors. It takes six screws.
Drill through the shroud to connect to the factory H2 mounts, then drill two new holes into the radiator mount to line up with the new shroud holes. Use the rubber isolator as a quide. Use 5/16" X 1/5" bolts to secure the latter
Site owner    IS 6:8  Psalm 91 
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Offline Flyin6

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Re: Hummer H2 SUT Build
« Reply #64 on: September 22, 2014, 01:45:25 PM »
Next install the N-P wiring harness. Connect the power leads under the 17mm nut on the positive cable. Attach the 2ea ground wires to the cable bracket 100mm bolt. Next expose the largish wiring harness next to the power cable and li=ocate the green wires. One is a dark green. Disregrard that one. The two remaining lime green wires are your target wires. Expose the wire and test each for 12VDC with the ignition on and the AC selected on. I got 11.42VDC on one, and 12.07VDC on the other. Go for the 12VDC lead. Tis is very important.
Connect or splice the harness lead to that wire.
Finally remove the plastic cover from the PCM, and remove the blue, 80 pin connector. Fnd slot #42 and insert the N-P pin through that hole and button the thing back up.
Site owner    IS 6:8  Psalm 91 
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Offline Flyin6

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Re: Hummer H2 SUT Build
« Reply #65 on: September 22, 2014, 01:45:57 PM »
Now you are at a crossroads. If you have a Diablo Predator Programmer, then you can call them to get them to turn on pin #42 with their programmer.

Or

You can chat with the folks at Nelson Performance and they will send you a new reprogrammed PCM which will do all that for you. Since my Diablo has been problamatic, I have opted for door #2. The N-P tune nets you an additional 30RWHP and some needed mileage increases.

On the latter front, after a lot of tweaking, driving on 35's and holding my speed at 65, I get 13.5 with my H2. I am looking for more and will report on what I get out of the new tune..

Good Luck if you try this one, and have fun!
Site owner    IS 6:8  Psalm 91 
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Offline Flyin6

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Re: Hummer H2 SUT Build
« Reply #66 on: September 22, 2014, 01:48:52 PM »
Next I found the spare tire carrier lacking. It is weak and at a bad angle
The spare tire needs to sit a bit higher and tilt inward to help departure angle, like pulling down a ditch, then immediately back up a hill.
I was off roading the H2 at the time and along with finding out how great those BFG tires worked, I was discovering lots of shortcomings with the H2.
Site owner    IS 6:8  Psalm 91 
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Offline Flyin6

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Re: Hummer H2 SUT Build
« Reply #67 on: September 22, 2014, 01:49:32 PM »
After modifying the stock carrier twice in the past, and finally getting it to the point where 1. It was weaker than stock, and 2. I couldn't open the tailgate, I finally think I got it right.
I uprated the tubing brom the stock .063 wall up to 3/16" steel. The spare is raised around 6" above stock, and it has an integrated hi-lift jack carrier
Here's some pics:
Site owner    IS 6:8  Psalm 91 
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Offline Flyin6

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Re: Hummer H2 SUT Build
« Reply #68 on: September 22, 2014, 01:50:16 PM »
Here's the difference in wall thickness:
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Re: Hummer H2 SUT Build
« Reply #69 on: September 22, 2014, 01:51:08 PM »
Showing the back side where the hi-lift base is stored...
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Offline Flyin6

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Re: Hummer H2 SUT Build
« Reply #70 on: September 22, 2014, 01:51:48 PM »
Spare side w/o spare and jack
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Re: Hummer H2 SUT Build
« Reply #71 on: September 22, 2014, 01:52:30 PM »
W/O spare, Hi-Lift mounted
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Re: Hummer H2 SUT Build
« Reply #72 on: September 22, 2014, 01:53:14 PM »
Spare is angled in toward the body to improve departure angle even more and get the weight closer to the arm centerline...

Results are good. Even though the spare tire sits higher, it does not wobble around anymore. The stiffer tubing makes a big difference. I ended up cutting the latch pin side off the stocker, then fitting in a section of the stronger tubing in place of the weaker stuff
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Offline Flyin6

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Re: Hummer H2 SUT Build
« Reply #73 on: September 22, 2014, 01:55:30 PM »
With the spare taken care of, the factory rock rails are poorly positioned, so I thought I'd do something about all that
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Re: Hummer H2 SUT Build
« Reply #74 on: September 22, 2014, 01:56:53 PM »
Just modified my stock rock rails. I had been using the 1.5" spacers with the 90mm bolts, but in my opinion, the rails were not positioned outboard far enough. On my other truck, I have them a good 2.5" from the rocker and clocked upward to a position just under the door. So I decided to do the same with my H2 stockers.
I already posted a similiar thread in another Hummer Forum so sorry if you're seeing this for the second time, but I wanted to make sure members over here got the information also.
So here are the stock rails removed and cut apart:
Site owner    IS 6:8  Psalm 91 
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Offline Flyin6

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Re: Hummer H2 SUT Build
« Reply #75 on: September 22, 2014, 01:57:40 PM »
Here the new 2.5" longer spacers (2 ea) are mocked up for measurement.
The new spacers are 2" box tubing, 3/16" thick mild steel and are fish mouth cut for a good fit
The stock tube is 2" O.D.
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Offline Flyin6

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Re: Hummer H2 SUT Build
« Reply #76 on: September 22, 2014, 01:58:51 PM »
Showing the stock and modified differences
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Offline Flyin6

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Re: Hummer H2 SUT Build
« Reply #77 on: September 22, 2014, 01:59:44 PM »
Here's the spacers. Actually I used 1" X 2" for the two center mounts that span the body mount since they were so close together
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Offline Flyin6

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Re: Hummer H2 SUT Build
« Reply #78 on: September 22, 2014, 02:00:22 PM »
Welding and grinding in process
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Offline Flyin6

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Re: Hummer H2 SUT Build
« Reply #79 on: September 22, 2014, 02:01:10 PM »
Ground welds and first coat of primer
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Re: Hummer H2 SUT Build
« Reply #80 on: September 22, 2014, 02:01:48 PM »
After spraying two coats of red primer and two coats of Duplicolor truck bed liner. It will take two cans to do both rails. I did not spray over the body mount parts as they were showing no signs of rust and were still holding up well.
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Offline Flyin6

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Re: Hummer H2 SUT Build
« Reply #81 on: September 22, 2014, 02:02:27 PM »
The other side...
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Offline Flyin6

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Re: Hummer H2 SUT Build
« Reply #82 on: September 22, 2014, 02:03:07 PM »
Left side mounted...
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Offline Flyin6

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Re: Hummer H2 SUT Build
« Reply #83 on: September 22, 2014, 02:04:28 PM »
And the right...
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Offline Flyin6

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Re: Hummer H2 SUT Build
« Reply #84 on: September 22, 2014, 02:05:03 PM »
Since I wanted the rails to double as steps I toped them with some 3M no-slip tape.
BTW, watch out dragging your calf over the rails after the tape is applied. Everyone in my family is now sporting some nice rasberries on the back of their legs!
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Offline Flyin6

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Re: Hummer H2 SUT Build
« Reply #85 on: September 22, 2014, 02:05:44 PM »
Here's the front access
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Offline Flyin6

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Re: Hummer H2 SUT Build
« Reply #86 on: September 22, 2014, 02:06:21 PM »
Rear door...
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Offline Flyin6

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Re: Hummer H2 SUT Build
« Reply #87 on: September 22, 2014, 02:07:21 PM »
And both...
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Re: Hummer H2 SUT Build
« Reply #88 on: September 22, 2014, 02:08:20 PM »
The bars were "clocked" upward to give more ground clearance at the rocker. Here's a view from underneath
« Last Edit: September 22, 2014, 02:09:27 PM by Flyin6 »
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Re: Hummer H2 SUT Build
« Reply #89 on: September 22, 2014, 02:16:48 PM »
Change gears...Suspension:
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Offline Flyin6

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Re: Hummer H2 SUT Build
« Reply #90 on: September 22, 2014, 02:16:58 PM »
I don't know if anyone has tried this or not, but I just did.

We all have the sagging rear spring problem with the non air bag H2's. They either are sagging or are getting ready to. Earlier (last year) I installed air bags inside the coil springs to stiffen the ride slightly and keep the height constant. Well, the springs sagged anyway. The poly bags are not long enough to reach all the way to the botom of the spring so what they really do is inflate against the coils themselves and add some rate to the cycling of the springs.

I took the two large yellow/brown snubbers from the rear, and reinstalled them inside the bottom of the coils and then reinstalled the springs with the airbags deflated.Upon airing the bags, they expand nicely downward and "encompass" the rubber snubbers and raise the vehicle nicely. About 15 lbs of air pressure raises my truck about 2".

I see this as a cost effective alternative to new or replacement springs and you have an inexpensive rear height adjustment mechanism.
Site owner    IS 6:8  Psalm 91 
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Offline Flyin6

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Re: Hummer H2 SUT Build
« Reply #91 on: September 22, 2014, 02:18:34 PM »









Re: Adjustable height rear suspension

Postby tomp ? Mon Jan 19, 2009 12:36 am

F6....Here is what I found with my coil springs
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Offline Flyin6

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Re: Hummer H2 SUT Build
« Reply #92 on: September 22, 2014, 02:22:11 PM »
I've begun a redesign of the rear suspension. I think I can find a bunch more travel back there for off road. So far I'm seeing only 5-6" of rear axle movement using jacks but believe there is more off road. But it seems to be very limited and bound up due to that rear sway bar and limited shock travel.

The plan is first to relocate the lower shock mount 4" higher, then remove the old mount to increase ground clearance, replace the rear springs, relocate the rear sway bar, and construct control arms with Johnny joints to remove the binding from the rubber bushings. I plan to do it in stages then document the results.

So far, I am recording a compressed spring height of 13" and an extended length of 18". So, at the spring I'm getting a pitiful 5" travel. Compare that to the 14" travel I get at the spring on my crawler, this H2 has a long way to go.

I selected Air Ride Technologies air spring as the starting point for the spring. Selling at $200 ea and as durable as a tire. I am taking a chance with a air spring, but I like the adjustability. Here's the spring I'm using:
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Offline Flyin6

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Re: Hummer H2 SUT Build
« Reply #93 on: September 22, 2014, 02:34:12 PM »
First I had to design all the parts to actually mount the air springs over top the factory coil spring mounts
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Offline Flyin6

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Re: Hummer H2 SUT Build
« Reply #94 on: September 22, 2014, 02:38:23 PM »
And that was fitted fairly easily
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Re: Hummer H2 SUT Build
« Reply #95 on: September 22, 2014, 02:41:44 PM »
I never liked how GM and other manufacturers allow the shock mounts to hang so low
On off road vehicles that just hangs up on things, so I decided to cut off the mounts and tuck them up higher
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Re: Hummer H2 SUT Build
« Reply #96 on: September 22, 2014, 02:43:30 PM »
I made some new mounts out of shock tabs
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Re: Hummer H2 SUT Build
« Reply #97 on: September 22, 2014, 02:47:48 PM »
Then I hardened that up with a skid plate
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Re: Hummer H2 SUT Build
« Reply #98 on: September 22, 2014, 02:51:43 PM »
Same thing with the sway bar
GM mounts it under the axle so you can find all the wait a minute vines

I removed it, moved it aft and up
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Re: Hummer H2 SUT Build
« Reply #99 on: September 22, 2014, 02:53:05 PM »
That required shorter sway bar arms, so I decided to make them disconnectable
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