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Exhaust options

So I finally got my car running right after all the shuddering studdering etc. It was the warm up regulator.. and the spark plug wires, they were supposedly both new but were acting up again. So now on to my next question. My heater has a terrible exhaust smell. It is an aftermarket performance exhaust. Until I can get the funds together to replace it with another one, what kind of horsepower losses would I be looking at going back to a stock 911 turbo exhaust etc. I have an external wastegate and a greddy profec spec b, can an external wastegate be hooked up to a stock porsche exhaust etc. I dotn know the manufacturer of the current aftermarket exhaust but it is fairly free flowing and has very little muffle of the exhaust note etc.

Thanks again for the help guys,

Mike
Old 11-05-2009, 08:15 AM
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Crotchety Old Bastard
 
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The smell is typically oil dripping on the heat exchanger and finding its way in. That will not change if stock exchangers are put on as the leak needs fixed. If the smell is exhaust fumes then the headers have failed creating a dangerous situation.
Sound is mostly a function of the muffler so a different issue than exchangers.
If you do go back to stock exchangers you can expect more lag and the loss of a few HP.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 11-05-2009, 08:45 AM
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Sorry to be vague, to clarify some more, we cut the two heater boxes open and welded up the cracks we could find. It seems to definitely be an exhaust not oil issue. even rewelded the cracks were too bad to patch. I really want to avoid stock exhaust but it looks like there is no other option for now.

Mike
Old 11-05-2009, 09:58 AM
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If you take the manifolds/headers off the car you can pressure test them and find any "pipe" leaks...
Old 11-05-2009, 11:23 AM
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we took the headers etc off and my mechanic filled with water to see where it was physically leaking. Patched it as best we/ he could but they must have re opened once remounted. Really bummed out if i have to replace it but thats how its looking.
Old 11-05-2009, 11:42 AM
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p.s Would anyone have a diagrom of the interior of the heater boxes? The reason I ask is that I have a friend up here at school who is great with a welder, might try one more time to fix it, I'd just like to know a bit more about what it looks like in there in detail.

Mike

Last edited by mlambert1987; 11-05-2009 at 11:48 AM..
Old 11-05-2009, 11:42 AM
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If you do have a leaky pipe, there is really no - long term - solution but to change the pipe.
Old 11-05-2009, 11:52 AM
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OFF THE BOOST PIPE NOW...
 
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You're trying to save a dollar when you should be trying to save your life. Get rid of the junk exhaust, bolt the stockers on and save up for another good set.

My .02
Old 11-05-2009, 05:02 PM
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Wo ist die Rennstrecke?
 
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Old 11-05-2009, 05:09 PM
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Good call, looking going to order headers this monday, either some fabspeed or schnell, not sure yet.
Old 11-06-2009, 09:19 AM
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Quote:
either some fabspeed or schnell, not sure yet
... so we can expect the same post again in three years?
T304 is inadequate for long term turbo applications, best to find something in 321. I will have exchangers ready in a couple of months if interested.
While you are looking and educating yourself you can pick up a set of Euro exchangers for a couple hundred.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 11-06-2009, 09:47 AM
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Euro exchangers is that just a more free flowing version of the stock setup? Where would you recommend I go for those? Thanks for all the advice so far, it's a good learning experience.
Old 11-06-2009, 11:37 AM
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Euro exchanger is really a misnomer. The USA heat exchangers from '86-'89 are the same as the Euro exchangers from'78-'89. The ones to avoid are the USA '78/9.
You can find those in the classifieds periodically for $200-$500 dependent upon condition. When you are finished with them you just re-sell and get your money back.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 11-06-2009, 01:41 PM
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