NAS 110 ride quality vs. my 110 - Defender Source
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  #1  
Old March 6th, 2016, 04:20 PM
Tyler Wirken
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Tyler Wirken
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NAS 110 ride quality vs. my 110

Hey all. So I have been doing a little work on a friends NAS 110 and drove it all day the other day to make sure all was good etc... I was pretty amazed how smooth and quiet it was compared to mine. I built mine and did sound proofing etc...so I am wondering what is making the difference. I have recently had some medical issues that resulted in bacterial meningitis that left me deaf in one ear and much more sensitive to noise and vibrations etc.... So I am trying to get my truck to be more tolerable behind the wheel. I have recently had to go from BFG mud-terrains to all-terrains because of the issues and that helped tremendously. The all-terrains are much smoother and of course quieter.

So the differences between my truck and the NAS are-

NAS 110 is bone stock original from factory except an R380 upgrade with small passenger car tread tires

Mine- 4.10 gears, stock Tcase from a 1997 90
R380
Old man EMu medium duty springs with Bilstein 7100 shocks - 360/80 valving in front 400/100 in rear.
BFG All-terrain KO2 285/75

My questions are-

Are 3:54's that much quieter than 4:10's? Mine has significant gear wine compared to the NAS 110. Can't imagine it is due to the transfer case.

Stock suspension compared to OME medium duty- stock seems to be surprisingly much much smoother. I can't recall when my 90 was stock how it felt. Would OME shocks improve ride quality over the Bilstein's? I appreciate any help. I know it won't ever be Range Rover in terms of ride quality and it never bothered me before but now that I have my issues anything would help.

Any other factors that I could not be thinking of or successful things you have done to improve ride quality?

Thanks

Tyler
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  #2  
Old March 6th, 2016, 04:40 PM
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I'm guessing its mostly tires. I'm using a highway all season because I really wanted to keep the noise down as much as possible.
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  #3  
Old March 6th, 2016, 04:41 PM
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Not sure if this is relevant, but with the 4.10 you are running slightly more rpm at the same road speed. Could it be an exhaust harmonic or vibration that is contributing to the sensation? Stock exhaust?
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  #4  
Old March 6th, 2016, 04:48 PM
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Put on the quietest road tires you can. First step of any noise reduction!
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  #5  
Old March 6th, 2016, 05:11 PM
RBBailey
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BFG AT's should be pretty quiet -- that is, compared to just the wind noise in a 110, they should hardly be noticed.

Do the NAS trucks have spring isolator/rubber spacer thingys?

Is there any noise deadening going on in places on the NAS that are not in the same place on your truck?

Do the NAS trucks have any plastic bits where ROWs have metal?

The dash board on the NAS is much more substantial than a standard dash. I would assume this may be a bit of an answer.
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  #6  
Old March 6th, 2016, 05:12 PM
cowboy
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Tyler, Blackfield & sonoros are onto something there. Per Consumer Reports tire tests, the quietest all season truck tires are somewhat more quiet than all terrains (unless they used a different measuring or rating methodology between the 2 categories for some reason). The suspension guy at Great Basin Rovers sees suspension bushings as a potential noise issue. He also sees shocks as a noise issue, and he recommended Bilstein f4-be5-2779-ho rear shocks for my 110.

Not sure about medium duty springs, why not stock?

And what motor does your 110 have?
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  #7  
Old March 6th, 2016, 07:24 PM
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Maybe the NAS 110's cage makes the body stiffer and then less flex and noise.

Also adds weight to the suspension for a smoother ride?
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  #8  
Old March 6th, 2016, 07:28 PM
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Heavier springs and stiffer shocks.
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  #9  
Old March 6th, 2016, 08:40 PM
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Our NAS 110 is pretty quiet too - completely stock with Bridgestone Blizzaks and OME shocks. I have a Ford Raptor on it's factory BFG AT's but not the KO2's...It's pretty quiet but I'm guessing it has a lot more sound-proofing than the 110 does - but the tires are still pretty quiet even with the windows down.

I'm guessing the KO2's may be a pretty noisy tire with the larger tread and wider spacing between...
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  #10  
Old March 6th, 2016, 08:42 PM
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The NAS D90's didn't come with spring isolators, don't know about the 110's.
If isolators will fit the 110, they make a BIG difference in road noise transmission, I have them on my 90.
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  #11  
Old March 6th, 2016, 09:12 PM
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whats the mileage on each truck?
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  #12  
Old March 6th, 2016, 11:25 PM
Tyler Wirken
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Thanks for all the thoughts. My 110 is basically an NAS with a full cage, etc... It started out as a 1997 90. So it has a 4.0 etc... The NAS has about 95,000 miles and mine has about 120,000.

I am sure the NAS tires are much quieter than mine but certainly it is not all tire noise I know that for sure. The majority of noise from my truck seems to be gear noise. So no one has any experience with noticing 4.10's being louder than 3.54's? What about transfer cases? Are they the same in each truck? I am not sure what came with the NAS 110's.

------ Follow up post added March 6th, 2016 10:27 PM ------

Quote:
Originally Posted by Red90 View Post
Heavier springs and stiffer shocks.
So does anyone make a lifted spring that has a rate similar to stock?

------ Follow up post added March 6th, 2016 10:29 PM ------

Quote:
Originally Posted by Viton View Post
The NAS D90's didn't come with spring isolators, don't know about the 110's.
If isolators will fit the 110, they make a BIG difference in road noise transmission, I have them on my 90.

Interesting. Are you referring to the rubber rings that go between the spring the frame on top of the spring?
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  #13  
Old March 6th, 2016, 11:46 PM
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Believe it or not the 4.10's are going to make the biggest difference along with a smaller more road appropriate tire. The 4.10's are changing the power band at higher speeds causing more noise. Compare the rpm load at 70 mph, and what I mean is at 70 mph see what your rpm is, and compare to his; yours will be considerably higher. Stock gears with stock tires along with transfercase 1.4/1.22 will make a huge difference. You can drop 4-600 rpm on the same tire size between a 1.4 to a 1.22. You will notice a huge difference in noise at higher rpms. That is where your biggest differences are between the two. There are codes on the bottom of the transfer cases that you can decode on Ashcrofts website.
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  #14  
Old March 6th, 2016, 11:52 PM
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Quote:
Originally Posted by Tyler Wirken View Post
So does anyone make a lifted spring that has a rate similar to stock?
Nope. You could use spacers. I would probably look at shocks first.
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  #15  
Old March 7th, 2016, 12:00 AM
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I went from 225/75R16's to 255/85R16's yesterday. Math wise the engine/trans/xfer case are now turn 12.9% slower due to the tires larger circumference. That equals way less noise and a cooler running engine. It will also yield a higher top end speed on a level surface. Are you both running the same diameter tires?
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  #16  
Old March 7th, 2016, 12:03 AM
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Quote:
Originally Posted by Tyler Wirken View Post
Interesting. Are you referring to the rubber rings that go between the spring the frame on top of the spring?
Yes they can go in either place, top or bottom, or both. They are an original part on the D1 & 2's. There are 2 different types, front RBC100111 and rear ANR2938. The rear type, I hear, will fit both top and bottom and front and rear.

Each one will raise your ride about 5/8".
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  #17  
Old March 7th, 2016, 12:08 AM
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Won't fit on the rear 110 springs.
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  #18  
Old March 7th, 2016, 12:10 AM
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Quote:
Originally Posted by Brewie212 View Post
Won't fit on the rear 110 springs.
Are the 110 rear springs are larger/smaller outside diameter?
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  #19  
Old March 7th, 2016, 12:21 AM
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Yes larger diameter
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  #20  
Old March 7th, 2016, 12:30 AM
Tyler Wirken
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Tyler Wirken
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Quote:
Originally Posted by Brewie212 View Post
Believe it or not the 4.10's are going to make the biggest difference along with a smaller more road appropriate tire. The 4.10's are changing the power band at higher speeds causing more noise. Compare the rpm load at 70 mph, and what I mean is at 70 mph see what your rpm is, and compare to his; yours will be considerably higher. Stock gears with stock tires along with transfercase 1.4/1.22 will make a huge difference. You can drop 4-600 rpm on the same tire size between a 1.4 to a 1.22. You will notice a huge difference in noise at higher rpms. That is where your biggest differences are between the two. There are codes on the bottom of the transfer cases that you can decode on Ashcrofts website.
Thanks. So I need to do that math on all of the gears then if I want to keep the tires I have.

I will check out Ashcrofts site.
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