NVH Changes - Where Did The Velcro Go?

[Erik]

In reading how the 94s and 95s got Velcro and foam pieces added to the interior to reduce squeaks and rattles, I was curious if anyone had ever posted a list of where all these pieces went. Has anyone managed to make all the changes the factory did?

[secondchance]

I am not sure if factory shared this secret in detail with the consumer. For one, passenger side door panel that butts up against the dash board went from a screw in early door panels to a Velcro in 94 & 95 - not exactly an improvement.
Never dissected early and later cars side by side but I noticed some Velcros under the dash in later cars.
in my opinion, large part of reduced NVH for later cars came from softening of the springs.

[Erik]

I am not sure if factory shared this secret in detail with the consumer. For one, passenger side door panel that butts up against the dash board went from a screw in early door panels to a Velcro in 94 & 95 - not exactly an improvement.
Never dissected early and later cars side by side but I noticed some Velcros under the dash in later cars.
in my opinion, large part of reduced NVH for later cars came from softening of the springs.

Interesting. I?ve heard it said that, compared to a 90, the 94-95 rides like a luxury sedan. Never had a chance to compare them though. I guess that?s what happens when a Cadillac guy starts running Corvette.

What springs did they use on the 94 anyway?

[secondchance]

Interesting. I?ve heard it said that, compared to a 90, the 94-95 rides like a luxury sedan. Never had a chance to compare them though. I guess that?s what happens when a Cadillac guy starts running Corvette.

What springs did they use on the 94 anyway?

http://www.wedophones.com/Manuals/Chevrolet/Corvette/1984-1996%20C4%20Corvette%20Suspension%20Tuning%20Chart .pdf

[Mystic ZR-1]

You talk hard ride?
Try an 84 with Z51.
Mine rode like a buckboard!

[Erik]

You talk hard ride?
Try an 84 with Z51.
Mine rode like a buckboard!

Yeah. I?ll pass on that. Lots of guys checked the Z51 box, who certainly shouldn?t have!

[Erik]

http://www.wedophones.com/Manuals/Chevrolet/Corvette/1984-1996%20C4%20Corvette%20Suspension%20Tuning%20Chart .pdf

That?s amazing. What a great chart. Yes, they softened them up a lot. With a bit more rear bar to compensate. Thanks!

[secondchance]

You talk hard ride?
Try an 84 with Z51.
Mine rode like a buckboard!

Doug,

I too had a 84 Z51 4+3 car. Bought it brand new in March 1984. Not the best car I bought but got a lot of attention when new.

[secondchance]

That?s amazing. What a great chart. Yes, they softened them up a lot. With a bit more rear bar to compensate. Thanks!

And stiffer shocks.

[Erik]

And stiffer shocks.

Too bad the chart doesn't show that.

[Hib Halverson]

As for the velcro and other changes made to the car to reduced squeaks and rattles. As I recall it was actually MY92-93 when a lot of those changes were made. Somewhere in press information I have from that period is a list of some of the things they did. I'll try and find that.
And stiffer shocks.

Please post the evidence you have that SRC shock valving was made stiffer at the time spring rates were lowered.

[secondchance]

Please post the evidence you have that SRC shock valving was made stiffer at the time spring rates were lowered.

No evidence Hib. Just recall reading it in a magazine article back in 92 to 93 explaining suspension change. Plus, remembering how my 91 rode (and a few other early cars owned by WAZOO guys) compared to a 94 I?ve owned since 2000.
Any evidence otherwise?

[Erik]

As for the velcro and other changes made to the car to reduced squeaks and rattles. As I recall it was actually MY92-93 when a lot of those changes were made. Somewhere in press information I have from that period is a list of some of the things they did. I'll try and find that.


Please post the evidence you have that SRC shock valving was made stiffer at the time spring rates were lowered.

Thanks!
I'd love to see that.

[secondchance]

This article describes revisions made to FX3 after 92 model year and mentions damping being more aggressive overall because of lower spring rate for 92.
This article was by you. Right? Hib?
https://www.corvetteactioncenter.com/tech/c4/fx3/index.html

[95 LT5]

Speaking of spring rates. Does anyone know where I can get a modified FX3 controller for a 95. One where it has different shock rates than stock?
I have one for my 89. Now I'm looking for one for my 95.
:cheers:

[Erik]

This article describes revisions made to FX3 after 92 model year and mentions damping being more aggressive overall because of lower spring rate for 92.
This article was by you. Right? Hib?
https://www.corvetteactioncenter.com/tech/c4/fx3/index.html

What a great read. Fantastic article!

[secondchance]

Speaking of spring rates. Does anyone know where I can get a modified FX3 controller for a 95. One where it has different shock rates than stock?
I have one for my 89. Now I'm looking for one for my 95.
:cheers:

I am guessing controller can be modified but more popular modification was shock valving. Bilstein, as I understand, use to perform custom valving but hasn't been very cooperative in recent years.

[Erik]

I am guessing controller can be modified but more popular modification was shock valving. Bilstein, as I understand, use to perform custom valving but hasn't been very cooperative in recent years.

Are they still doing the rebuilds?

[secondchance]

Are they still doing the rebuilds?

I am not sure. For one, if shocks are original as they came on the car - no. If purchased as replacement, supposedly, they would. However, as far as I know, Bilstein has not been eager to provide this service.
Someone with recent experience dealing with Bilstein might chime in.