sts or rear mount have serious question.
Thread Starter
Launching!
Joined: May 2008
Posts: 282
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From: va beach
sts or rear mount have serious question. My car has just started to make a noise out of the exhaust the tail pipe to be precice. it sounds like something is partially blocking it or something and it sounds like an exhaust leak on a lower scale but it is not leaking from anywhere. could my cats be coming apart and blocking it partially or has anyone experienced anything close to this?
This is exactly why I would not run a cat ahead of the turbo. We had the same thing happen many years ago on a Ferrari 308 that had a rear mounted turbo. Part of the cat came apart and destroyed the turbo. Bob
Thread Starter
Launching!
Joined: May 2008
Posts: 282
Likes: 0
From: va beach
Thread Starter
Launching!
Joined: May 2008
Posts: 282
Likes: 0
From: va beach
mine still runs as strong but I am going to take it in and have it looked at by the local speed shop.
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Thread Starter
Launching!
Joined: May 2008
Posts: 282
Likes: 0
From: va beach
my question is if the cat comes apart that should be a pretty noticable sound and if there were pieces stuck in the turbo you would feel a difference but I don't. maybe it is just sucking air from somwhere?
well i put alot of work in that so called turbo and for someone to say we dont have a real turbo just makes me a little salty thats all. but you really need to get those cats off! that is the first thing to do even if its not the prob. or gut them. unless you have emmisions or such. when i took my cats off there were little pieces of metal or ceramic chunks that came out. i think they were on there last leg. but if that would have went through the turbo it might have caused a prob. and i didnt even know they were going bad. so no you might not hear at all. but sometimes you will hear rattling. you may want to get under there and hit the cat with your fist and see if you can here some rattling. you should not here anything at all inside there moving around.
Yeah check for leaks. If u have exhaust wrap it makes it harder, I know mine was wraped and when I changed y pipes out the old one had a huge crack where it cam together, but it was hidden and only heard under power. Thats probably why I could not get past 10psi with the boost controller turned all the way up.
A lot of exuast leaks are hard to find. I pressurize the intake and xhuast seperately with comressed air and search for leaks, often using water/soap. I have seen boost leak into the center section of a working turbo, which made it way through the oil drain to the crank case, pressurizing the crank case with boost. I assume the same is possible with exhuast too.
I use a leak down tester for pressure checks also.
I use a leak down tester for pressure checks also.
yea my car had only 59k on my stock cats and when i did my headers i was all happy to sell the cats to that guy on here for 160$ but when i got em down...to my supprise they blew they were gone??? nothing inside them?
Joined: Jun 2004
Posts: 1,501
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From: Ft. Irwin, California (But Virginia is home)
Yeah check for leaks. If u have exhaust wrap it makes it harder, I know mine was wraped and when I changed y pipes out the old one had a huge crack where it cam together, but it was hidden and only heard under power. Thats probably why I could not get past 10psi with the boost controller turned all the way up.
Exhaust wrap makes it easy as $hit to find any leaks. The wrap will discolor a sooty black whereever a leak is.
Found/fixed 4 when I was under the car one day. Joined: Jun 2004
Posts: 1,501
Likes: 7
From: Ft. Irwin, California (But Virginia is home)
Yep, a leak on top of the pipe would be a bit harder to detect.
BTW, there are a couple threads on the cons of double-wrapping. Mainly deals w/ moistue retention between the layers = bad for the exhaust pipes. I ran a single layer w/ a 1/2" overlap. Leaks seep past the single layer and give a soot film to the wrap, which is easy to spot.
Knappbunch, couple things you should check.
1. Pull the converters and see what they look like.
2. Pull the turbo (not hard....4 1/2" bolts I believe) and check the impeller blades for debis or damage.
3. If you have AIR delete plates on the exhaust manifolds.....check to make sure those aren't leaking. They will produce a tick that can be heard all over the darn car and from the tailpipe when not properly sealed.
BTW, there are a couple threads on the cons of double-wrapping. Mainly deals w/ moistue retention between the layers = bad for the exhaust pipes. I ran a single layer w/ a 1/2" overlap. Leaks seep past the single layer and give a soot film to the wrap, which is easy to spot.
Knappbunch, couple things you should check.
1. Pull the converters and see what they look like.
2. Pull the turbo (not hard....4 1/2" bolts I believe) and check the impeller blades for debis or damage.
3. If you have AIR delete plates on the exhaust manifolds.....check to make sure those aren't leaking. They will produce a tick that can be heard all over the darn car and from the tailpipe when not properly sealed.