Adding some compliance & softness back in

[jbailer]

That's why you are ok.

I've done both combos.

Poly diff mounts stock cradle as well as delrin cradle and stock diff.

Once I went delrin cradle with poly diff I had enough.

If I understood correctly what you said there, I agree. I have a pretty good list of mods to enhance my suspension but they were designed to work together. This is my suspension so far with no NVH.

Steeda Progressive Springs
Steeda Front + Rear Sway Bars w/Billet Mounts
Steeda Extreme G-Trac K-Member Brace
Steeda IRS Subframe Bushing Support System
Steeda Urethane Differential Mount Bushing System (Red)
Steeda IRS Braces
Steeda IRS Subframe Alignment Kit
Steeda Billet Aluminum Vertical Links
Steeda Bumpsteer Kit
Steeda Billet Aluminum Shock Mounts
Steeda Billet Rear Spring Spacers 1/8"
Steeda Adjustable Bumpstop Kit
Koni Sport Adjustable Shocks and Struts (currently set 0.25 F - 0.75 R - From soft) will back down the rear down to 0.5.

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[Gibbo205]

Could be the 20" wheels with (I assume) lower profile tires than stock. I'm running FRPP track pack, CB005, steeda RLCA bearing, and PP 19" wheels w/stock size tires. The tire place recently put 255/40 - 19s on the rear by mistake and the ride immediately went to shit. The lower profile tires transmitted every road imperfection into the cabin. Once the correct size tires were put back on the car, the ride is silky smooth again.

Probably an unpopular suggestion, but going back to 19s could help the ride and preserve the handling by allowing you to keep all your other mods.

Yes moving up in wheel size made the ride harsher for sure. Car jiggles a lot more in the rear and a lot more tyre/diff noise since moving to 20", they just seem to amplify it more and they are 4-5kg than stock.

Stock I was on 275/40/19 MPSS brand new tyres.
Now I am on 295/35/20 MPSS part worn 4yr old tyres.


So tomorrow I am trying following:
- Fitting 295/35/20 PS4S brand new rear tyres
- Removing the red steeda bushing inserts.

One question, when removing, I have my 4 old diff bolts, but their is two lengths.

So where the longer bolts go, the rear of diff (rear of car) or the front of diff (where drifeshaft enters diff)?

 

[Gibbo205]

Ford removed the Steeda bushing differential inserts at my request today as since fitting 20" wheels with part worn tyres the NVH transmitted through the rear of the car went up, lot more road noise and diff whine can be annoying, I showed them the CJ video of Bill fitting them though don't think it was required they seemed pretty clued up and they had it done in less than an hour.

Though I got more than I bargained for by removing as my transmission clunk/thud is also completely remedied, I even tried to make it happen on purpose but the transmission is now silent and thud free, so unless they did something else on the service removal of those parts has killed NVH a lot and the ride harshness has marginally improved. Somewhere along the line the transmission thud these cars come with stock has being remedied as with the CB005 and diff inserts it became a clunk. But since service and removal of bushing inserts it is completely gone so the inserts for sure transmit the clunk but maybe they also did something else or re-positioned something on the car when they removed them or did the service as its completely gone. I shall ask them in case Ford know a fix and are secretly applying it when servicing cars.....

Of course I believe once the new PS4S are fitted tomorrow ride quality will improve again as the £25 rear MPSS I used temporarily were pretty hard and down to 3mm, also had less grip than Pzero too, haha.

 

[Burkey]

Ford removed the Steeda bushing differential inserts at my request today as since fitting 20" wheels with part worn tyres the NVH transmitted through the rear of the car went up, lot more road noise and diff whine can be annoying, I showed them the CJ video of Bill fitting them though don't think it was required they seemed pretty clued up and they had it done in less than an hour.

Though I got more than I bargained for by removing as my transmission clunk/thud is also completely remedied, I even tried to make it happen on purpose but the transmission is now silent and thud free, so unless they did something else on the service removal of those parts has killed NVH a lot and the ride harshness has marginally improved. Somewhere along the line the transmission thud these cars come with stock has being remedied as with the CB005 and diff inserts it became a clunk. But since service and removal of bushing inserts it is completely gone so the inserts for sure transmit the clunk but maybe they also did something else or re-positioned something on the car when they removed them or did the service as its completely gone. I shall ask them in case Ford know a fix and are secretly applying it when servicing cars.....

Of course I believe once the new PS4S are fitted tomorrow ride quality will improve again as the £25 rear MPSS I used temporarily were pretty hard and down to 3mm, also had less grip than Pzero too, haha.

Mine is exactly the same Gibbo. The Steeda reds didn't add any noticeable gear whine (exhaust is LOUD) but the clunking from driveline backlash became insane. They're coming out today. :doh:
Perhaps autos have more luck with these than manuals?

 

[Bluemustang]

Mine is exactly the same Gibbo. The Steeda reds didn't add any noticeable gear whine (exhaust is LOUD) but the clunking from driveline backlash became insane. They're coming out today. :doh:
Perhaps autos have more luck with these than manuals?

No I doubt that. I have an auto and I experience the same clunk with my Steeda urethane diff inserts. I am using the black 90 durometer ones. I am surprised Steeda claims little to no NVH from these because that's just not true.

 

[BMR Tech]

Ford removed the Steeda bushing differential inserts at my request today as since fitting 20" wheels with part worn tyres the NVH transmitted through the rear of the car went up, lot more road noise and diff whine can be annoying, I showed them the CJ video of Bill fitting them though don't think it was required they seemed pretty clued up and they had it done in less than an hour.

Though I got more than I bargained for by removing as my transmission clunk/thud is also completely remedied, I even tried to make it happen on purpose but the transmission is now silent and thud free, so unless they did something else on the service removal of those parts has killed NVH a lot and the ride harshness has marginally improved. Somewhere along the line the transmission thud these cars come with stock has being remedied as with the CB005 and diff inserts it became a clunk. But since service and removal of bushing inserts it is completely gone so the inserts for sure transmit the clunk but maybe they also did something else or re-positioned something on the car when they removed them or did the service as its completely gone. I shall ask them in case Ford know a fix and are secretly applying it when servicing cars.....

Of course I believe once the new PS4S are fitted tomorrow ride quality will improve again as the £25 rear MPSS I used temporarily were pretty hard and down to 3mm, also had less grip than Pzero too, haha.

Gibbo, great to hear!

I have tested just about every combo and brand of part out there and can say I am not surprised.

I have the same, with the BMR Diff Inserts on my '16....but it is not enough to make me remove them.

We simply advertise our Poly Diff Lockout Kit as the lowest NVH solution we offer. Of course, NVH is subjective...and some people claim zero NVH with them...but I have not found that to be true with any diff solution on the market with the BMR project cars, or my cars. :cheers:

 

[jbailer]

Mine is exactly the same Gibbo. The Steeda reds didn't add any noticeable gear whine (exhaust is LOUD) but the clunking from driveline backlash became insane. They're coming out today. :doh:
Perhaps autos have more luck with these than manuals?

I see you also have the BMR CB005. I still say I hear more people that use that combo say they get NVH. Take out the CB005, I bet the NVH goes away too and then the Steeda Diff inserts would be fine.

No I doubt that. I have an auto and I experience the same clunk with my Steeda urethane diff inserts. I am using the black 90 durometer ones. I am surprised Steeda claims little to no NVH from these because that's just not true.

It is true. Do you by chance have the BMR CB005 also? You don't live far from me, if you don't believe the Steeda Diff inserts don't make that clunk we can get together and I'll show you. I have a lot done to my suspension and no clunking and all Steeda.

Don't get me wrong, I'm not saying BMR is bad, I just think the Steeda parts were engineered to work together.

 

[Bluemustang]

I see you also have the BMR CB005. I still say I hear more people that use that combo say they get NVH. Take out the CB005, I bet the NVH goes away too and then the Steeda Diff inserts would be fine.



It is true. Do you by chance have the BMR CB005 also? You don't live far from me, if you don't believe the Steeda Diff inserts don't make that clunk we can get together and I'll show you. I have a lot done to my suspension and no clunking and all Steeda.

Don't get me wrong, I'm not saying BMR is bad, I just think the Steeda parts were engineered to work together.

That is a good point. I do have the BMR CB005 as well, so the combination of the two may be causing the clunking. I didn't experience the clunking with the CB005 before the diff inserts went in, but very possible the two aren't a great match. I'm not sure the NVH is enough to make me get rid of either one.

But good point and I'll be happy to admit that possibility.

 

[BMR Tech]

For performance, the CB005 will provide more benefit than a diff solution.

I would never steer anyone in the direction of using a diff solution over the CB005.

 

[jbailer]

For performance, the CB005 will provide more benefit than a diff solution.

I would never steer anyone in the direction of using a diff solution over the CB005.

lol I hope that's not what you got out of what I said Kelly...

Steeda has braces that I'm using that provide that functionality very well along with the diff inserts. All with no NVH. Again, I'm not saying yours aren't a valid solution, I'm just saying it's not correct to say the Steeda diff inserts are causing the noise.

 

[Gibbo205]

For performance, the CB005 will provide more benefit than a diff solution.

I would never steer anyone in the direction of using a diff solution over the CB005.

This my car is silent with the diff bushing supports removed and ride quality is a touch less harsh, still could do with improving that but new tyres could help with that, we shall see.

Also if I had to take diff inserts or CB005, then it would be CB005 every time because that cradle lockout kit does way more for our cars than the diff inserts does.

If the rear still feels to harsh after new tyres, I shall maybe give re-fitting the PP dampers to just the rear a try to see how it effects the ride, just hope don't make rear-end floaty again.

 

[Gibbo205]

lol I hope that's not what you got out of what I said Kelly...

Steeda has braces that I'm using that provide that functionality very well along with the diff inserts. All with no NVH. Again, I'm not saying yours aren't a valid solution, I'm just saying it's not correct to say the Steeda diff inserts are causing the noise.

All I can say is when I had only diff inserts installed as I put those on first in isolation the transmission noise was not particular bad but they definetely caused differential whine at highway speeds and a low hum noise at low speed and the thud turned to a clunk, but it was soft/mild, hard to notice.

Then I fitted CB005 which made the clunk very noticeable! :(

But now removing the differential inserts and leaving CB005 in place the car is silent, so the two together do create a lot of NVH.

Like Kelly says this is not just Steeda differential inserts, they will all cause this kind of NVH, but CB005 in isolation for me is silent and offers more improvements over diff inserts.

 

[jbailer]

All I can say is when I had only diff inserts installed as I put those on first in isolation the transmission noise was not particular bad but they definetely caused differential whine at highway speeds and a low hum noise at low speed and the thud turned to a clunk, but it was soft/mild, hard to notice.

Then I fitted CB005 which made the clunk very noticeable! :(

But now removing the differential inserts and leaving CB005 in place the car is silent, so the two together do create a lot of NVH.

Like Kelly says this is not just Steeda differential inserts, they will all cause this kind of NVH, but CB005 in isolation for me is silent and offers more improvements over diff inserts.

Yeah and you probably would have had those same benefits from adding the Steeda Subframe Bushing Support System instead of adding the CB005. Like I said, the parts are engineered to work together.

And I'm done. I don't want to interrupt the fan club.

 

[BMR Tech]

[MENTION=15518]jbailer[/MENTION] no, that's not how I took it.

I was just referring to the guys in this thread with the CB005 - just in case they were considering it. That's all.

 

[jbailer]

[MENTION=15518]jbailer[/MENTION] no, that's not how I took it.

I was just referring to the guys in this thread with the CB005 - just in case they were considering it. That's all.

Cool. BTW, I agree 100% I wouldn't choose the diff inserts over the CB005 either. If I had the diff inserts and wanted to eliminate subframe movement, I would simply add the Steeda subframe bushing supports.

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