Rear Spring issue - ZR-1 Net Registry Forums

32valvZ · 07-25-2009

I noticed my car was sitting lower on the driver side. I wanted to lower it down some anyway, so I bought the longer bolts and did so. I couldnt get it even in the back with the new bolts. I had to use a new one and a stock one in conjunction. It looks good and even, but now it scrapes the resonator on dips while cruising.

Is my spring worn out too far? Is that why I couldnt use both long bolts?

ZR1Vette · 07-25-2009

There are reports of 'spring' failure due to delamination (not like a layer cake but rather the bonding)/ cracking of the synthetic springs due to age. First starts as you are describing your situation then gets progressively worse (basically spring failure).

rhipsher · 07-25-2009

Mine did the same thing a while ago. And the funny thing is when you put the new spring and the old side by side they look identical and there's no signs of damege. It simply looses its regitity.

32valvZ · 07-26-2009

So, its pretty well done I guess. I am planning on looking for a low mile used one. Does it absolutely have to be for a ZR-1 or can I use one from say a 96 coupe?

-=Jeff=- · 07-26-2009

Quote:

Originally Posted by 32valvZ

So, its pretty well done I guess. I am planning on looking for a low mile used one. Does it absolutely have to be for a ZR-1 or can I use one from say a 96 coupe?

89-96 are all the same , but remember there are different spring rates..

Kb7tif · 07-27-2009

http://www.idavette.net/hib/c4/sustunch.pdf

Quote:

Originally Posted by -=Jeff=-

89-96 are all the same , but remember there are different spring rates..

Here is a chart One can see the huge difference of the z51

Kb7tif · 07-27-2009

Quote:

Originally Posted by 32valvZ

I noticed my car was sitting lower on the driver side. I wanted to lower it down some anyway, so I bought the longer bolts and did so. I couldnt get it even in the back with the new bolts. I had to use a new one and a stock one in conjunction. It looks good and even, but now it scrapes the resonator on dips while cruising.

Is my spring worn out too far? Is that why I couldnt use both long bolts?

Your spring sounds shot, and when those lowering bolts are used they soften up the spring. I have mine lowered with the bolts its a too soft for my liking, I will change spring rate or get the adjustable spring,,,

HIZNHRZ · 07-27-2009

rhipsher,

Are you saying that the back of your car (from driver side to passenger side) did not sit level so you replaced the rear leaf spring. After you installed the new leaf spring, did it then sit level?

07-29-2009

Take your pick John.

Stock on the left, poly on the right.

07-25-2009	#1
32valvZ Join Date: Nov 2007 Location: Sunshine State Posts: 1,071	Rear Spring issue I noticed my car was sitting lower on the driver side. I wanted to lower it down some anyway, so I bought the longer bolts and did so. I couldnt get it even in the back with the new bolts. I had to use a new one and a stock one in conjunction. It looks good and even, but now it scrapes the resonator on dips while cruising. Is my spring worn out too far? Is that why I couldnt use both long bolts? __________________ [B]1990 #2815[/B] [COLOR="Red"][B]Red/Red[/B][/COLOR] Ported Plenum & IH (by Pete) Haibeck Chip Rebuilt FPR (by Phil) FIC Injectors Watson LT Headers 3" Stainless Works exhaust Lingenfelter Open Air Lid Bill B Built Transmission Shifter & C Beam Plates [FONT=Impact][COLOR=red]1992 [COLOR=black]#[/COLOR] 091[/COLOR][/FONT] [FONT=Impact][COLOR=#ff0000]Red/[COLOR=silver]Gray[/COLOR][/COLOR][/FONT] [B]SOLD[/B]

07-25-2009	#2
ZR1Vette Join Date: Dec 2007 Location: Reston, Virginia Posts: 939	Re: Rear Spring issue There are reports of 'spring' failure due to delamination (not like a layer cake but rather the bonding)/ cracking of the synthetic springs due to age. First starts as you are describing your situation then gets progressively worse (basically spring failure). __________________ Michael :cheers: [I][SIZE="2"]1990 RED on RED #566[/SIZE][/I] [I][SIZE="2"]WAZOO MEMBER[/I][/SIZE]

07-25-2009	#3
rhipsher Join Date: Aug 2008 Location: Houston 90 Red ZR-1 Posts: 2,320	Re: Rear Spring issue Mine did the same thing a while ago. And the funny thing is when you put the new spring and the old side by side they look identical and there's no signs of damege. It simply looses its regitity.

07-26-2009	#4
32valvZ Join Date: Nov 2007 Location: Sunshine State Posts: 1,071	Re: Rear Spring issue So, its pretty well done I guess. I am planning on looking for a low mile used one. Does it absolutely have to be for a ZR-1 or can I use one from say a 96 coupe? __________________ [B]1990 #2815[/B] [COLOR="Red"][B]Red/Red[/B][/COLOR] Ported Plenum & IH (by Pete) Haibeck Chip Rebuilt FPR (by Phil) FIC Injectors Watson LT Headers 3" Stainless Works exhaust Lingenfelter Open Air Lid Bill B Built Transmission Shifter & C Beam Plates [FONT=Impact][COLOR=red]1992 [COLOR=black]#[/COLOR] 091[/COLOR][/FONT] [FONT=Impact][COLOR=#ff0000]Red/[COLOR=silver]Gray[/COLOR][/COLOR][/FONT] [B]SOLD[/B]

07-27-2009	#8
HIZNHRZ Join Date: Apr 2004 Location: Germantown, MD Posts: 738	Re: Rear Spring issue rhipsher, Are you saying that the back of your car (from driver side to passenger side) did not sit level so you replaced the rear leaf spring. After you installed the new leaf spring, did it then sit level?

07-29-2009	#9
Jeffvette Guest Posts: n/a	Re: Rear Spring issue Take your pick John. Stock on the left, poly on the right.

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