Help! Vibrating Catback Exhaust

bradz

I had my Invidia Gemini installed last Tuesday and everything was fine until early this morning I got my ERZ hfc installed and the whole catback exhaust is now vibrating. Pressing the accelerator pedal and as soon as you let off the gas the whole exhaust system vibrates like hell. We checked all the bolts and everything is tight. Do you guys have any suggestion what the problem is? Please help.

esfourteen

check for loose bolts in the extra o2 bungs on the HFC, people have been having issues with these rattling

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bradz

We already checked those and they are all tight.

craniac24

It could be just the nature of the HFC. Rattles/Rasp are fairly common.

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Red370

check the crossmember, alot of exhausts tend to sit very close to it and are probably vibrating against it, its a pretty noisy occurance.

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bradz

when we lifted the car up to the lifter and rev it, as soon as the rpm drops down we saw that the catback is vibrating. It just happen when I installed the ERZ hfc. We checked if it is hitting against something but we didn't see nothing. My transmission is vibrating too.

Zsteve

did u check all the hangers to make sure one didnt break? Seems kinda wierd, it shouldnt be doing that.

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2010 LS3 C6 Silver coupe corvette

bradz

yup, all hangers were ok.

Zsteve

Then I would say the vibration is really coming from the front but just getting amplified on the CBE. Double check the HFCs.

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2010 LS3 C6 Silver coupe corvette

bradz

That's what I am thinking off. I had Invidia Gemini installed few weeks ago with the stock hfc and no vibration at that time.

bradz

It only happens at exactly 1800 rpm. I put it up in the air and tried free-revving it to see what was vibrating, but everything seems solid. I've followed the entire exhaust system from the exhaust manifolds to the muffler and nothing is touching or loose from front to back. All exhaust hangers/bushings are in use and tight.[YOUTUBE]

Mike

It will vibrate. I'm pretty sure what you are hearing is the exhaust touching the crossmember. Mine didn't touch either, but when running and vibrating some it would. I just put a thick washer on every bolt hole between the cross brace and the car and it solved the problem.

I have Gemini + Berk test pipes.

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bradz

"between the cross brace and the car "? is this the metal bracket that on top of the invidia x pipe?...

the whole pipe from the hfc to the pipe before the muffler is shaking. my shifter knob is vibrating too everytime the pipes shake.

daleks

Maybe it's curved flanges on your most recently added part? Possibly a poor contact on a flange is allowing movement.

bradz

I don't know. I don't have any idea now. I love the sound. I love the noticeable power gains but with that vibration, I am not gonna' be satisfied