Exhaust system question - ZR-1 Net Registry Forums

SharkPilot · 11-07-2009

Last night during a full throttle blast my exhaust suddenly got much louder. Looking ubderneath the car I saw that the resonator had moved aft far enough to slip off the head pipes that come from the converters. The whole exhaust sustem had moved far enough back to pull the pipes apart. A closer inspection found some rather sorry looking welding that had broken there. I was able to slip it all back together and use some bailing wire to keep in place to get home. The head pipes probably slip 1.5" into the front of the resonator.
My question: Should that be welded there or did the factory install clamps there? The FSM doesn't illustrate that with enough detail to tell. This is at the front of the resonator right behind the mount that's attached to the transmission.

Thanks everyone, SharkPilot

jonszr1 · 11-07-2009

how far is it from your cats . i have 2 zr1 exhausts sitting in my barn 90, 91 the only clamping is up by the cats on them .hope this helps

tomtom72 · 11-08-2009

My 90's OE system has no clamps anywhere, save for the connection from the cat exits to the pipes leading to resonator's inlet. At the resonator it's a welded connection and all the rest of the connections from that point back are welded.

QB93Z · 11-08-2009

The exhaust from my 1993 ZR-1 is hanging in my garage. Here are some pictures I took a while ago. If you need more detailed pics, let me know, i can take them this evening.

Here are what stock manifolds and cats look like:

This is the forward end of the stock exhaust system. These connections on the left in the picture connect to the cats.

here is the resonator:

Here is the back of the resonator to the mufflers:

I hope this helps.

Jim

SharkPilot · 11-08-2009

Thank you everyone. The photos pretty much answered my questions. It makes me wonder what was done sometime back in the car's past. The system looks stock but those welds that broke were certainly not factory work. Something must have been replaced along the way.
I'll just have mull over getting it rewelded or just using clamps. Does it really matter?

Thanks, SharkPilot

jonszr1 · 11-08-2009

if you use the 360 band clamps like in his first pic showing the stk manifolds you should be good to go . i use them on my 90 as i am trying different mufflers for the sound i want

11-07-2009	#1
SharkPilot Join Date: Aug 2005 Location: Anaheim, California Posts: 105	Exhaust system question Last night during a full throttle blast my exhaust suddenly got much louder. Looking ubderneath the car I saw that the resonator had moved aft far enough to slip off the head pipes that come from the converters. The whole exhaust sustem had moved far enough back to pull the pipes apart. A closer inspection found some rather sorry looking welding that had broken there. I was able to slip it all back together and use some bailing wire to keep in place to get home. The head pipes probably slip 1.5" into the front of the resonator. My question: Should that be welded there or did the factory install clamps there? The FSM doesn't illustrate that with enough detail to tell. This is at the front of the resonator right behind the mount that's attached to the transmission. Thanks everyone, SharkPilot __________________ [CENTER][SIGPIC][/SIGPIC] 1991 ZR-1 #1135 Red/Red with both tops. Stock except for an open topped K&N filter.[/CENTER]

11-07-2009	#2
jonszr1 Join Date: Sep 2006 Location: lone pine and mammoth lakes Posts: 1,407	Re: Exhaust system question how far is it from your cats . i have 2 zr1 exhausts sitting in my barn 90, 91 the only clamping is up by the cats on them .hope this helps

11-08-2009	#3
tomtom72 Join Date: Dec 2004 Location: Jacksonville, FL USA Posts: 4,645	Re: Exhaust system question My 90's OE system has no clamps anywhere, save for the connection from the cat exits to the pipes leading to resonator's inlet. At the resonator it's a welded connection and all the rest of the connections from that point back are welded. __________________ 1990 ZR-1, Black/grey, #2233, stock. ZR-1 Net Reg Founding Member #316 & NCM member

11-08-2009	#4
QB93Z Join Date: May 2007 Location: Westminster, Maryland Posts: 3,689	Re: Exhaust system question The exhaust from my 1993 ZR-1 is hanging in my garage. Here are some pictures I took a while ago. If you need more detailed pics, let me know, i can take them this evening. Here are what stock manifolds and cats look like: This is the forward end of the stock exhaust system. These connections on the left in the picture connect to the cats. here is the resonator: Here is the back of the resonator to the mufflers: I hope this helps. Jim __________________ If it isn't fun, you aren't doing it right! 1990 Black ZR-1 - sold 1993 Quasar Blue ZR-1 1994 Competition Yellow ZR-1 1995 Dark Purple ZR-1 Maryland State Coordinator WAZOO Member

11-08-2009	#5
SharkPilot Join Date: Aug 2005 Location: Anaheim, California Posts: 105	Re: Exhaust system question Thank you everyone. The photos pretty much answered my questions. It makes me wonder what was done sometime back in the car's past. The system looks stock but those welds that broke were certainly not factory work. Something must have been replaced along the way. I'll just have mull over getting it rewelded or just using clamps. Does it really matter? Thanks, SharkPilot

11-08-2009	#6
jonszr1 Join Date: Sep 2006 Location: lone pine and mammoth lakes Posts: 1,407	Re: Exhaust system question if you use the 360 band clamps like in his first pic showing the stk manifolds you should be good to go . i use them on my 90 as i am trying different mufflers for the sound i want

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