Have you noticed a big difference with the noise reduction padding? I’m tempted to do the same, but curious if it will have an impact.

 

Small world indeed! Was yours the tan one with the Duramax swap I saw there or the black one on 40's? Ian always seems to have a few H1/HMMWV's there he's working on.

I just got the H1 back from the transmission shop yesterday after a few weeks (waiting on parts here and there). I will be doing the two driver side doors with the 80mil Kilmat over the next week and then doing a sound measurement. What I can tell you so far is that it definitely sounds quieter driving around. What I've done so far is the 80mil Kilmat on the two right side doors and the 394mil closed cell sound deadening on the roof. It's noticeably quieter, but I'll get the decibel meter on it once I insulate the two left side doors to see what the actual measurable difference is.

 

It's the tan one with the duramax swap. Definitely let me know when you take a measurement/get it all done. It seems like it's going to be some work to get all the matting in, but if it makes a big difference definitely adding to my list.

 

Absolutely! Happy to meet up if you want to see how it sounds driving around in person. I'm swamped with work the next few weeks, but the first or second week of February I'll have time.

 

Found out why the blower motor wasn't working. Old wasp next was blocking it from spinning. Slapped it a couple times and it started spinning, but was off balance. Pulled it out and found the old wasp nest. Good as new again. Now it's time to vacuum out all the refrigerant, check for a good seal, and charge it back up.

 

When Ian Ward was working on the H1 for me I had him install the RubberDuck manual wastegate controller:
https://www.rubberduck4x4.com/produc.../?sku=HDP-1550

I drive like an old man, gently, in no rush to get anywhere. But I like to make sure that everything is adjusted properly across the entire throttle/load range. I noticed the DTC code pop up a few times for over-boost over the last few weeks. I took some time this week to adjust the manual wastegate controller's spring tension. Took a few drives between adjustments while gently rolling into full throttle to make sure the code does not come back. All set and back to being within what the factory ECM wants to see for boost pressures.

I guess it must have been very slightly off, but not much. I don't really notice a difference in power. And all seems to be running pretty much the same and healthy. But glad to know that even under full load or going up hill the boost pressure is now staying where the factory ECM wants it to.

 

For some of the folks that are still on the fence about getting a Tech2 scanner, thinking your OBD2 scanner has you covered. Just bite the bullet and get a Tech2 or a Tech2 clone. Even if you don't need it to program anything, it is pretty much a necessity when it comes to troubleshooting little things here and there. If you have a Hummer, just buy one. Quick glance at some of the main data it shows in this clip:



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I loved the look of the original factory stereo. But like a lot of you mentioned, I missed my CarPlay and my apps.
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This is the unit I bought now. I think this one is perfect for the 2004/2006 Alpha interior.
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https://amzn.to/3XOH5Kg-
Ditched the 7inch screen and went with this 10inch unit. Has a lot of height and angle adjustability so I could get it positioned exactly where I wanted. Fits perfectly between the AC vent and Climate control without covering either one. The display is surprisingly sharp and plenty bright. And it’s very fast with no lag. And right out of the box it connected easily to both my iPhone and my Google Pixel. Sounds great too. Very happy with this one, and at $200 it’s a steal! I’ll do a full video on the install soon.

 

Finally got the decibel measurements recorded and uploaded for the before and after of the sound deadening on the Hummer H1. This is using the Dynamat/Kilmat style 80mil material on the doors and the 394mil closed cell sound deadening material on the roof.

Here is the exact 394mil closed cell sound deadening I purchased and installed: https://amzn.to/3K8soxR

Here is is the 80mil Kilmat (dynamat 80mil alternative) that I purchased and installed: https://amzn.to/3YgiAWu

Installation roller for the Kilmat/Dynamat: https://amzn.to/40GZf2k

Bafx sound decibel meter SPL Sound Pressure meter that I used: https://amzn.to/40HcQqD

Full video here:
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PMD Failed over the weekend. Got it replaced and all's operating as normal again. I'll be mocking up a very large heatsink to replace the other one that most people use. Should help to keep the PMD cooler.
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And of course, video update:
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