FLP Headers?
Thread Starter
On The Tree
Joined: Mar 2002
Posts: 175
Likes: 0
From: League City TX
FLP Headers? I have had the flp's on for couple of months, every time I hit a sharp bump in the road I get a smacking sound under car?? Have checked everywhere they or the Y pipe could be hitting and have put rubber there, can't figure out whats causing this. Was wondering if anyone else had "run" into this problem?
Thanks
Steve
Thanks
Steve
Thread Starter
On The Tree
Joined: Mar 2002
Posts: 175
Likes: 0
From: League City TX
Re: FLP Headers? Stock suspension. Sometimes on one side then the other. Have put soft rubber above everywhere it could be hitting...does it with cats in or out. Begining to think it is the pipes "clanging together" at the V-band clamps, although they seem tight as could be?
Steve
Steve
Staging Lane
Joined: Feb 2002
Posts: 64
Likes: 0
From: Tampa, FL *U*S*A*
Re: FLP Headers? Mine flaps around under hard acceleration (the y-pipe <img src="gr_grin.gif" border="0"> ) You need to do the infamous HEATER HOSE MOD. Yes, pay $1300 for headers but be sure to save the $2.50 for band clamps and some hose <img src="gr_eek2.gif" border="0"> I go under my car every few weeks and adjust the hose so the freekin things stay quiet and to avoid false knock retard. I read that if you use a poly transmission mount the flex in the driveline will diminish and stop the flapping too. I wouldn't mess with a poly transmission mount on a daily driver though.
Rob
[ March 02, 2002: Message edited by: WSlow6 ]</p>
Rob
[ March 02, 2002: Message edited by: WSlow6 ]</p>
Re: FLP Headers? I'd definitely check the y-pipe, particularly the drivers-side of the y-pipe. FLP has remedied the situation, but some have had problems with this in the past. I've had mine bang once, but it was when I was at WOT and found a "washboard" in the road. Needless to say, that jarred about EVERYTHING on the car! <img src="gr_images/icons/mad.gif" border="0">
The tolerances on the f-bodies vary, and that's why you'll see some guys have problems and some not. Also, let's remember that there's a reason why GM flattens the stock y-pipe into an oval. Using round pipe and trying to keep it tucked up close to the car is really going to push the tolerances of the cars. The above case is the only time I've ever had my y-pipe bang, but I've heard of others having repeated problems. Let's face it: GM doesn't spend a wad of cash on the f-body, so quality and tolerances aren't the best. Just look at our incredibly cheap, plastic interior. <img src="images/icons/rolleyes.gif" border="0"> At any rate, look at the bottom of the car just above where the y-pipe runs, and see if you can see any rubbing or hitting going on. The heater hose seems to be working quite well for those w/ problems.
The tolerances on the f-bodies vary, and that's why you'll see some guys have problems and some not. Also, let's remember that there's a reason why GM flattens the stock y-pipe into an oval. Using round pipe and trying to keep it tucked up close to the car is really going to push the tolerances of the cars. The above case is the only time I've ever had my y-pipe bang, but I've heard of others having repeated problems. Let's face it: GM doesn't spend a wad of cash on the f-body, so quality and tolerances aren't the best. Just look at our incredibly cheap, plastic interior. <img src="images/icons/rolleyes.gif" border="0"> At any rate, look at the bottom of the car just above where the y-pipe runs, and see if you can see any rubbing or hitting going on. The heater hose seems to be working quite well for those w/ problems.
__________________
Launching!
Joined: Nov 2001
Posts: 226
Likes: 0
From: bergen cty. NJ
Re: FLP Headers? Did you reinstall the tunnel brace if so it is probably hitting that. I pop riveted hose to the brace and padded it down with rubber grommets. Check your exhaust where it goes over the axle in case something has shifted. I have a 1LE tranny mount and its worth every penny (SLP). If all else fails check endlinks on sway bars to make sure there tight, had that problem once.
Thread Starter
On The Tree
Joined: Mar 2002
Posts: 175
Likes: 0
From: League City TX
Re: FLP Headers? Cross member not installed. Rarely does it on hard accelaration, mostly just once and a while on a sharp "bsd" ridge in the road. Have thought about the poly trans mount, but didn't know how bad vibration would be...daily driver. the 1LE mount sounds like a good idea.
Steve
Steve
Trending Topics
On The Tree
Joined: Jan 2002
Posts: 148
Likes: 0
From: Dallas area
Re: FLP Headers? [quote]Originally posted by Jasc:
<strong>Cross member not installed. Rarely does it on hard accelaration, mostly just once and a while on a sharp "bsd" ridge in the road. Have thought about the poly trans mount, but didn't know how bad vibration would be...daily driver. the 1LE mount sounds like a good idea.
Steve</strong><hr></blockquote>
I have also heard that the 1LE mount is a good compromise between stock and poly. Planning on doing that soon <img src="gr_stretch.gif" border="0">
<strong>Cross member not installed. Rarely does it on hard accelaration, mostly just once and a while on a sharp "bsd" ridge in the road. Have thought about the poly trans mount, but didn't know how bad vibration would be...daily driver. the 1LE mount sounds like a good idea.
Steve</strong><hr></blockquote>
I have also heard that the 1LE mount is a good compromise between stock and poly. Planning on doing that soon <img src="gr_stretch.gif" border="0">
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
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
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
Five Reasons the Camaro Was the Most Pivotal Player in the Pony Car Wars 2.0
Brett Foote
10 Reasons the LS7 Is GM's Most Extreme Naturally Aspirated V8 Engine Ever
Verdad Gallardo
TECH Addict
Joined: Feb 2002
Posts: 2,319
Likes: 0
From: Lewisville, Texas
Re: FLP Headers? You never did say what exhaust system you have. I have the FLP LT headers and a Corsa cat back exhaust and had the same problem. My banging was coming from the hanger bracket over and slightly aft of the axle. Heated the bracket with a torch and bent it up and aft giving me about 3/8" clearance between the axle and the pipe and now all is quiet.
Mark
Mark
Thread Starter
On The Tree
Joined: Mar 2002
Posts: 175
Likes: 0
From: League City TX
Re: FLP Headers? Have the Corsa too, had some noise at first with it also. Did the same as you, heated and bent...no noise then. New noise started after the flp's went on. It only does it sometimes and normally only when I hit a real sharp bump, what gets me is sometimes it sounds like it is on the passenger side and sometimes on the driver side(almost sounds like it is right under the seats). Does it with cats on or off.
Thread Starter
On The Tree
Joined: Mar 2002
Posts: 175
Likes: 0
From: League City TX
Re: FLP Headers? Finally found the problem! Lower control arm bolts were just barely loose, letting noise tranfer up the SFC's. Made it sound like it was right under seats. Tightened them up just a little and voila! no more noise! Thanks for your replies and suggestions.
Steve
Steve
TECH Addict
Joined: Feb 2002
Posts: 2,319
Likes: 0
From: Lewisville, Texas
Re: FLP Headers? Good to hear. I just got my tubular LCA's back from having the bearings replaced, will re-install them tomorrow and hope not to have anymore rattling. I almost think boxed LCA's are the way to go.
Mark
Mark
