Droan Noise/ Bad pipe from manifold to wastegate?

[Vroom]

7/21/02

Droan noise update/ Bad pipe from manifold to wastegate: 86 944 Turbo

I have finally gotten a diagnosis that may be correct. The mechanic says that the noise I’m hearing after 10 minutes, at operating temp, between 1900 and 2900 rpms, is coming from the intermediate double walled short pipe from the exhaust manifold to the wastegate. I got very excited that I was finally going to solve this problem. However, the parts manager at Porsche dealer says the part alone is over $1000, and the labor to replace this pipe is intensive and expensive. He says many turbo owners try to live with the noise since the cost to replace is so high.

Is there a way to replace this pipe at reasonable cost? By a mechanic? Have any of you ever been through this or replaced this pipe? I don’t think I am experienced enough to do this job myself. Can I find this pipe or a single walled replacement for this pipe at reasonable cost?

Thanks for sending advice!!!

Ave (86 Turbo, 141K....in Rockland County, NY)

[geoffbaltz]

Once again, I posted this for you back in September of 2001:

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My 86 951 had a terrible rattle that we couldn't find either.

1st) Thought the O2 sensor was rattling in the exhaust - that was fine. Still rattled.

2nd) Thought the double-walled downpipe had separated - replaced it with 3" SS downpipe and cat bypass from fabspeed. Still rattled.

3rd) Checked the turbo, the heatshields, and anything else that might be loose. Still rattled.

4th) Replace the small (8" long) pipe that comes right off the turbo and the downpipe bolts to. THAT WAS IT!! That pipe is double-walled also and had split on the inside where the inner pipe is welded at the flange on the turbo side.

Smooth as silk now and no noises.

I have the original part still - I will snap some shots tonight and post them here of the split on the inner portion of the pipe.

BAD NEWS: THIS PART IS NOWHERE TO BE FOUND IN THE USA. I HAD TO ORDER FROM PORSCHE AND IT CAME FROM GERMANY AND TOOK ABOUT 10 DAYS. $400 FOR THE PART.

I would NOT replace it with a used one either. You are just asking for problems. This pipe is subjected to some serious temps and the expansion and contraction takes it's toll. Not easy to get to either.

Hope this helps.

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This is from this post:
http://forums.pelicanparts.com/showthread.php?threadid=14456&highlight=noise

The part is not $1000, that is B.S., I paid about $400 for it from a Porsche Dealer.

Good Luck.

-g

[Vroom]

Geoff, I definitely remember your reply about the rattle. My droan noise is not really a rattle, more a droan. I want to be sure we're talking about the same pipe. Ian (from Ian's Eurosport in Fl) gave me a diagram by email. The parts mgr. circled a "shortish" pipe that comes off the exhaust manifold. The pipe has sort of a "U" shape, and connects to the turbo or wastegate, not sure. Part number is #951-111-096 15 Is this the same as the 8" pipe? I could fax you a copy of the diagram so you could be sure? Don't know how to use scanner yet. Do you have a fax number available? Mailing address?
Thanks so much for your advice.

Ave

[geoffbaltz]

I am talking about number 23 in this diagram:

[geoffbaltz]

The part number is 951 111 098 01

-g

[geoffbaltz]

The part number you are referring to is what Porsche calls the crossover pipe. The old number is 951 111 096 13 and has been replaced with 951 111 096 15.

If it is that pipe, you or your mechanic should be able to get to it with a stethescope (sp?) to narrow it down. I find it hard to believe since that pipe doesn't see nearly the temps of the pipe off the turbo or the downpipe does. I would have him listen to the pipe I am referring to. I guess I am trying to say, determine if it is coming from the turbo side or the exhaust manifold side.

Let me know.

-g

[Vroom]

Geoff, You're incredible. Thanks a lot for the part info, and advice about checking pipes, some running hotter than others. I tried to copy the diagram, but could not do it. Is it possible to fax it to me??

My answering machine and fax number is : 845-623-9426. Simply press start button at end of outgoing message. Should work.

Thanks again. I'll keep you posted.
Once more, your problem was a rattle. Did you experience a droan?

Ave

[geoffbaltz]

It started as a droan and then became a rattle.

I am faxing now.

-g

[Vroom]

Didn't get fax. Number again is 845-623-9426 Seems to be working, got a fax from someone else today.
Thanks, Ave

[geoffbaltz]

My bad, my modem was hung from a storm here the other night.

I am resending it now.

-g