Three Upgrades which Created Noticable NVH

[xl_cheese]

Cradle Lockout + Poly vertical Links + Perf Toe Link Bearing = More NVH

I recently did these three upgrades simply because it was something I could do for fun. Each of these states there is minimal to no increase in NVH. However, after doing all three, they have created a very noticable increase in road noise that resonates through the rear of the car.

I did the BMR Cradle lockout first. I noticed a tiny bit of NVH increase. Mainly on the highway when going over the seams in the road. The next mods I did a few weeks later were the BMR poly verticle links and the ford performance toe bearings at the same time. With those the NVH is quite a bit more.

I'm not too worried about it and it's not enough to make me want to remove these mods. I may poke around and see if I could place some sound deadener in the back to help.

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[K4fxd]

Shoulda went with steeda...

LOL

I do have the stop the hop kit and I notice zero added NVH. The car is stiffer so I do feel the road more but I consider this a plus. I never did like the 1974 Lincoln or Cadillac floating down the road feel.

 

[Buldawg76]

Shoulda went with steeda...

LOL

I do have the stop the hop kit and I notice zero added NVH. The car is stiffer so I do feel the road more but I consider this a plus. I never did like the 1974 Lincoln or Cadillac floating down the road feel.

So not a fan of riding in the clouds HuH.

BD

 

[GrabberBargeCaptain]

I've done the Steeda subframe braces and IRS supports and get the same kind of resonance on crappy roads at highway speeds (this also may vary with tire choice-i use PS4S) The improvement in handling far outweighs the negatives though.

 

[Skye]

By stiffening the chassis components and improving its overall ability to keep the car planted to the road, I would expect some increase of NVH, any package. Kind of like if any of us developed a super-sensitive sense of touch or smell: not everything we'd feel or notice would be welcome. I feel it's the price one pays for having an improved setup and performance. See road race and circuit cars.

Opinions will vary on which company's package is better on NVH. This thread might be great at determining which are best.

Tire brand, type and balance will have some effect on NVH, possibly amplifying any affects from the suspension changes.

 

[K4fxd]

So not a fan of riding in the clouds HuH.

My BIL just bought a Cherokee piper so I will get to ride the clouds again.

 

[Aonarch]

+1 on Steeda, I have the Ultimate Handling Package and FP bearings, zero increase in NVH.

 

[SBR70.3]

I installed the Steeda Ultimate Handling Package on my Mach 1 this weekend. Took her for a drive yesterday.....no noticeable increase in NVH but the rear end is far more solid! This is the 2nd S550 platform I have put this kit on and I have been impressed. Install was super easy too.

My first track day of the season is this weekend and I will see how well the kit really works.

 

[GTP]

.... I may poke around and see if I could place some sound deadener in the back to help.

Speaking as a mechanical and acoustic engineer, sound deadening won't help. The stiffening of the rear end will transmit vibrations mechanically, not acoustically. This is why we "feel" the extra NVH and not "hear" it. IOW, it can be increased Vibration and Harshness, but not Noise.

 

[xl_cheese]

Speaking as a mechanical and acoustic engineer, sound deadening won't help. The stiffening of the rear end will transmit vibrations mechanically, not acoustically. This is why we "feel" the extra NVH and not "hear" it. IOW, it can be increased Vibration and Harshness, but not Noise.

I def hear it. It resonates through the rear of the car. One of the components for the NVH acronym is Noise.

 

[GTP]

Even so, sound deadening won't help at all.

 

[GrabberBargeCaptain]

I installed the Steeda Ultimate Handling Package on my Mach 1 this weekend. Took her for a drive yesterday.....no noticeable increase in NVH but the rear end is far more solid! This is the 2nd S550 platform I have put this kit on and I have been impressed. Install was super easy too.

My first track day of the season is this weekend and I will see how well the kit really works.

I’ve found it’s a specific type of road surface at highway speeds that transmits the noise. So maybe that’s why Steeda claims that, they don’t have this crappy resurfaced road near them.

But anyway, let’s be realistic. Filling a rubber void with an aluminum disk is highly unlikely not to result in an nvh increase. On the smoothest roads sure but in the real world I don’t see how that reinforcement wouldn’t transmit nvh directly to the driver. Which is not a bad thing! These cars out of the box are very numb. Good for long road trips (GT-grand touring after all) but not very involving for the driver.

 

[SBR70.3]

I’ve found it’s a specific type of road surface at highway speeds that transmits the noise. So maybe that’s why Steeda claims that, they don’t have this crappy resurfaced road near them.

But anyway, let’s be realistic. Filling a rubber void with an aluminum disk is highly unlikely not to result in an nvh increase. On the smoothest roads sure but in the real world I don’t see how that reinforcement wouldn’t transmit nvh directly to the driver. Which is not a bad thing! These cars out of the box are very numb. Good for long road trips (GT-grand touring after all) but not very involving for the driver.

You should see the roads in my neighborhood............

I have 30+ years of owning and modifying various Mustangs and am quite sensitive to changes. The potentially negative attributes of NVH associated with the Steeda Kit is borderline unnoticeable.

Disclaimer.....I do not have any financial interest in Steeda products. I just like them.

 

[ORRadtech]

Speaking as a mechanical and acoustic engineer, sound deadening won't help. The stiffening of the rear end will transmit vibrations mechanically, not acoustically. This is why we "feel" the extra NVH and not "hear" it. IOW, it can be increased Vibration and Harshness, but not Noise.

Even so, sound deadening won't help at all.

I'm having trouble agreeing with this. If the frame/subframe is transmitting more vibration to the body it seems to me that sound deadening in certain areas could lessen some noise.
An example, behind the plastic trunk trim the quarter panel sheet metal is a large bare metal surface perfect for turning vibration into sound. It's not my area of training but it makes sense to me that treating that, and similar areas, could/would dampen the noise extra vibration would induce.

 

[Oakley]

Shoulda went with steeda...

LOL

I do have the stop the hop kit and I notice zero added NVH. The car is stiffer so I do feel the road more but I consider this a plus. I never did like the 1974 Lincoln or Cadillac floating down the road feel.

Cradle Lockout + Poly vertical Links + Perf Toe Link Bearing = More NVH

I recently did these three upgrades simply because it was something I could do for fun. Each of these states there is minimal to no increase in NVH. However, after doing all three, they have created a very noticable increase in road noise that resonates through the rear of the car.

I did the BMR Cradle lockout first. I noticed a tiny bit of NVH increase. Mainly on the highway when going over the seams in the road. The next mods I did a few weeks later were the BMR poly verticle links and the ford performance toe bearings at the same time. With those the NVH is quite a bit more.

I'm not too worried about it and it's not enough to make me want to remove these mods. I may poke around and see if I could place some sound deadener in the back to help.

my guess is if you drove a PP1 car you'd lose your mind at how much NVH increases over the base floater.

thsoe things you listed won't increase NVH in any of the performance variants.

furthermore just NVH in general is really a clumsy bad way to describe noise vibration or harshness because not only does it have the drawback of being THREE DIFFERENT THINGS most people don't really have a good understanding of what any of those mean.

IN ADDITION TO THAT NVH without a specified context is UTTERLY USELESS in any sort of review.

Example time:

Doing the rear diff bushing inserts increased NVH

harsness? no.
vibration? no.
noise? yes.
okay, great... when?

only when i'm shifting gears.

oh okay so not in any sense that actually makes the car worse and certainly not a persistent noise vibration or harshness that hangs around on long drives WHICH IS ALL ANYONE REALLY CARES ABOUT.

that is how you do a review. if you don't actually give any useful information to go along with your review that contradicts everyone else's experience get ready to be written off as a crazy person or idiot.

I need a snack.

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