Three Upgrades which Created Noticable NVH

[GTP]

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.

Be careful reading my posts. I did not say that there is no additional NVH. I simply claimed that (typical marketed) sound deadening products will not reduce any noise.

People misunderstand sound physics a lot. Sound is vibration in air. Mechanical vibration is just that - vibration, which may or may not cause sound vibrations.

There is no practical and effective way to reduce the mechanical components from vibrating in their response to the mere act of driving on a road. Rubber bushings are a way of decoupling mechanical parts from each other, which is a cost-effective way to reduce some of the NVH that naturally occurs.

You can certainly hear more noise from the rear (and especially the exhaust) by lowering one of the back seats. But you cannot apply sound deadening material to mechanical components and expect a quieter result. Microphone measurement tests would prove this out.

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[Oakley]

Be careful reading my posts. I did not say that there is no additional NVH. I simply claimed that (typical marketed) sound deadening products will not reduce any noise.

People misunderstand sound physics a lot. Sound is vibration in air. Mechanical vibration is just that - vibration, which may or may not cause sound vibrations.

There is no practical and effective way to reduce the mechanical components from vibrating in their response to the mere act of driving on a road. Rubber bushings are a way of decoupling mechanical parts from each other, which is a cost-effective way to reduce some of the NVH that naturally occurs.

You can certainly hear more noise from the rear (and especially the exhaust) by lowering one of the back seats. But you cannot apply sound deadening material to mechanical components and expect a quieter result. Microphone measurement tests would prove this out.

i'll +1 this by pointing out that I had no idea how loud this PP1 was going to be when i ordered it.
the road noise, exhaust, everything, loud all the time. in an attempt to tame this I added dynomat and this foambacked sound absorption mat stuff to the whole trunk, decklid, and part of the rear seat area as well as the doors.

while this did actually improve the experience the sound is still there. I went on a 300 mile roadtrip the other day with full suspension(everything listed + several other things) and apart from hearing the gear changes when i'm at a stop (from the diff that is no longer floating with flimsy rubber and a shred of hope) there is no noticible noise/vibration/or harshness apart from what the dual rate springs give (a little harshness resulting in some bucking/bounciness).

i had to come to terms with the simple fact that this is not as refined a car as I wanted it to be and it never will be. under its sophisticated veneer its just a mustang so shooting for mercedes ride quality and sound isolation is a fool's errand.

 

[5.0_Lojos]

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.

I have a similar setup and the cradle lockout kit. No NVH on my end. Make sure everything is properly torqued, maybe? Recently added the red strut tower brace mainly for the appearance. (Also BMR) Car is race red.

 

[MidwayJ]

I have installed the BMR cradle lockout on two different Mustangs (without the other 2 mods you mentioned). I didn't notice any difference in NVH. I have noticed some tires are noisier than others on gnarly or grooved pavement.

 

[John S]

I did the usual axle housing lockouts, cradle bushing lockouts, suspension component upgrades, etc., etc on my son's GT w/3.55 ratio Torsen differential and my Mach 1 w/3.73 ratio Torsen differential. The only objectionable impact to NVH is the high frequency whine from the ring & pinion during expressway driving.

 

[SheepDog]

NVH was not noticeably increased on any of the mods I did (subframe braces, cradle lockouts, locating sleeves, vertical links), until I installed the Differential bushing inserts. I only did the 2 rearward facing bushings, (Red) and it is definitely noticeable now.

 

[K4fxd]

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

Probably not. Unless it squeaks, creaks and groans. To me road feel is not NVH

 

[Oakley]

Probably not. Unless it squeaks, creaks and groans. To me road feel is not NVH

im not referring to "feel" at all. PP1 cars are louder compared to their lesser brethren from what i've observed.

 

[Mustangpursuit]

I only have the BMR CB005 Lockout kit paired with the Steeda bushing kit designed to be used with that BMR kit. got no NVH change at all and rides smooth. I guess with that filling in the subframe holes, it may have secured it better with less play?

 

[stannypack]

Personally I want to rip out all the sound deadening from the car so I can feel every bump and sound. Makes me feel more alive

 

[NightmareMoon]

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.

Of those, I would drop the cradle lockout first. I think it moves the least (no real data) and it isolates the rest of the rear suspension and subframe from transmitting NVH to the chassis.

I cant speak to the vertical links but the toe bearing is probably the last thing I’d remove.

I noticed a *ton* of NVH adding cradle supports and diff supports to a car which only had the RLCA bearing and toe bearing. Those original two mods didnt add any NVH at all by themselves.

 

[K4fxd]

Of those, I would drop the cradle lockout first. I think it moves the least (no real data) and it isolates the rest of the rear suspension and subframe from transmitting NVH to the chassis.

That cradle moves at least 1/2 inch under hard cornering, this is the last thing I'd remove.

 

[Oakley]

Of those, I would drop the cradle lockout first. I think it moves the least (no real data) and it isolates the rest of the rear suspension and subframe from transmitting NVH to the chassis.

I cant speak to the vertical links but the toe bearing is probably the last thing I’d remove.

I noticed a *ton* of NVH adding cradle supports and diff supports to a car which only had the RLCA bearing and toe bearing. Those original two mods didnt add any NVH at all by themselves.

i guarantee it was the diff supports, the ones at the pinion bearing in particular.

i have everything but the pinion bearing supports and had no noticible increase in NVH at cruising.

the only additional noise i have is i can hear the rear when i change gears from a stop.

 

[GrabberBargeCaptain]

That cradle moves at least 1/2 inch under hard cornering, this is the last thing I'd remove.

yeah... the cradle lockouts are probably the most impactful handling mod you can make on these cars.

 

[Skm]

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

I am experiencing the same. Having owned a Bullitt and a couple of gt I was surprised by the vibration and noise (humming) when I purchased a mach 1. It’s bothered me so much I am getting the dealership to run some diagnostics to see if there is something else going.

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