HELP, y-pipe is knocking
HELP, y-pipe is knocking Ok, today I just installed a SLP y-pipe on my 01 SS. After I was done I took it out to see how it sounded. While I was out, under acceleration the pipe is knocking under my car. What can I do to stop this. Or has antone had this problem. What about poly trans mounts and poly motor mounts?
TECH Fanatic
Joined: Nov 2001
Posts: 1,780
Likes: 7
From: Mi./Al.
Re: HELP, y-pipe is knocking You shouldn't have any banging going on, loosen the clamps and re-adjust the y-pipe. Another thing to look for is the postion of the clamps. It's kinda of hard for me to explain but if you have a clamp near the under body that can cause the banging, rotate the clamp and see what happens.
Al
Al
12 Second Club
Joined: Mar 2003
Posts: 334
Likes: 0
From: jonesville, MI
Re: HELP, y-pipe is knocking I had the exact same problem with my SLP y-pipe. I installed a polyurethane trans. mount and it solved that problem. I also did a poly torque arm mount while I was there. Beware of increased cabin noise from exhaust. The weak sloppy trans. mount serves as a noise isolator which is gone with the very stiff poly mount.
Trending Topics
Joined: Nov 2001
Posts: 34,638
Likes: 2,565
From: Schiller Park, ILL Member: #317
Re: HELP, y-pipe is knocking Might also be the Y-pipe banging on the tunnel brace. You can just pull that tunnel brace off, the factory piece is too weak to do anything for you anyway.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
TECH Fanatic
Joined: Nov 2001
Posts: 1,780
Likes: 7
From: Mi./Al.
Re: HELP, y-pipe is knocking The tunnel brace isn't all that great but it's better then nothing, if it's hitting the tunnel brace use some washers and a little longer bolts to drop the brace some.
TECH Resident
Joined: Nov 2002
Posts: 996
Likes: 0
Re: HELP, y-pipe is knocking </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by DARK AGE 53:
<strong> The tunnel brace isn't all that great but it's better then nothing, if it's hitting the tunnel brace use some washers and a little longer bolts to drop the brace some. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Ditto. Worked for me!
I also pounded the bump in brace with a sledge hammer to flatten it out...
Tommy <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
<strong> The tunnel brace isn't all that great but it's better then nothing, if it's hitting the tunnel brace use some washers and a little longer bolts to drop the brace some. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Ditto. Worked for me!
I also pounded the bump in brace with a sledge hammer to flatten it out...
Tommy <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
On The Tree
Joined: Jun 2002
Posts: 152
Likes: 0
From: Fort Wayne, IN
Re: HELP, y-pipe is knocking Had the same problem with my 02 z28. All I did was grabbed 8 washers and spaced the tunnel brace down. This way you dont have to beat on anything to stop that crappy banging noise.
justin
justin
Re: HELP, y-pipe is knocking I had to beat my convertible X-brace severely
to get it to shut up, and the pipe somewhat,
just strategic "dimples". The washers didn't
do enough because they only lower the back
mounting points and the bind is up front if
you have the convertible style brace. The
whole thing wants to be jacked and shimmed as
you go tightening it up, this includes the
I-pipe too, all the way back to the gas tank.
Then you get a nice tight setup with adequate
clearances.
to get it to shut up, and the pipe somewhat,
just strategic "dimples". The washers didn't
do enough because they only lower the back
mounting points and the bind is up front if
you have the convertible style brace. The
whole thing wants to be jacked and shimmed as
you go tightening it up, this includes the
I-pipe too, all the way back to the gas tank.
Then you get a nice tight setup with adequate
clearances.
Joined: Nov 2001
Posts: 34,638
Likes: 2,565
From: Schiller Park, ILL Member: #317
Re: HELP, y-pipe is knocking </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by DARK AGE 53:
<strong> The tunnel brace isn't all that great but it's better then nothing, if it's hitting the tunnel brace use some washers and a little longer bolts to drop the brace some. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I disagree. I ran without one for about a year and didn't notice any difference. But, then again, I have SLP 3pt SFCs, so I still had plenty of floor board support...
I know of many people that take it off and forget about it. Washers are a fine solution, but until you get the washers, if it's driving you nuts just take it off. You can always put it back on whenever you have the chance to buy some washers. <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />
<strong> The tunnel brace isn't all that great but it's better then nothing, if it's hitting the tunnel brace use some washers and a little longer bolts to drop the brace some. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I disagree. I ran without one for about a year and didn't notice any difference. But, then again, I have SLP 3pt SFCs, so I still had plenty of floor board support...
I know of many people that take it off and forget about it. Washers are a fine solution, but until you get the washers, if it's driving you nuts just take it off. You can always put it back on whenever you have the chance to buy some washers. <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />
