Corvette Jake

We finally figured out what the problem was guys. Not only did i have a weaker set of leaf springs, but i also had loose sub frame bolts in the front and rear just above the sway bars. I tightened them to specs and now the car is completely different in corners. Has anyone else ever checked their subframe bolts???

CaseyJones

Weaker springs by part number or wear? Loose subframe mount bolts I can believe but wouldn't have considered. Good catch.

SuperTom

Damn I wonder if loose subframe bolts are a common thing. Haven't heard much on here. Used to read Hyundai Genesis forums and it was common there

Corvette Jake

I drove down to the local corvette shop and had them remove my old springs and put the new ones in. After they got the old ones out and we were able to see them under good lighting, they figured out that they were off of a z51, and they are partially delaminating in the rear from some type of oil seepage. At least thats what the guys claimed.
Just tightening up my frame bolts made a huge difference, but now with the new springs it feels like a complete track monster! I swear she runs like a raped ape now haha

Corvette Jake

I can take pictures to show you where the bolts are located if you would like to check yours. The rears are simple to tighten but the front ones make you drop the sway bar

SuperTom

I had a rattle noise that I was trying to hunt down last year and tightened up any bolt I could find under the car. Turns out the noise was from a hood spacer somehow turning. I'm sure I'm fine but there maybe others who want to see.

Why would someone put z51 springs on a z06 doesn't make any sense?

Corvette Jake

Im thinking that maybe they ran out of z06 leaf springs on the assembly line and just said fck it, z51 is close enough. or maybe the previous owner had some problems and had then installed

Rob 02

I use Z51 on the rear with the C6 Z06 sway bar for street. The casting number on mine is 22171757 and the part number on the sticker is 22146646.

If this is what was on your car, I would be curious too. I will bet the new one wasn't cheep but I'm glad to hear that you fixed before it broke.

2FAS4UU

Quote;
Why would someone put z51 springs on a z06 doesn't make any sense?

...I'm not 100% sure, but I believe that a Z51 'front' spring is the same as as Z06, and the Z06 'rear' springs were increased in stiffness over the Z51 rears...

Rob 02

Unless the FE3 suspension was available on a Z06 that year (which still kind of doesn't make since).

The only reason I chose that rear spring is for city driving and I went with a stiffer rear sway. The front Zxx springs are the same though.

RSbeast

Oil seepage? They are solid

Rob 02

Possible differential gear oil from leaky seals.