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Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Diesel Discussion > Diesel Performance Tuning

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  #1  
Old 05-15-2009, 01:40 PM
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Cool exhaust manifold options...

i havnt done much looking but im guessing there isnt much in the area of aftermarket exhaust manifolds, if there is id like if sombody can direct me towards it. otherwise i was wondering if i could port the manifold and ceramic coat it if i would see any worthy gains, thinking about extrude honing too but i kno that could be pricey. lmk what you guys think.. thanks

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1985 mercedes benz 300D turbo diesel
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Old 05-15-2009, 02:05 PM
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Ceramic coating or thermal wrap may net you a slight gain by reducing spool up time. For mine, I designed my own manifold which I'm having fabricated by a local motorcycle shop that specializes in turbo installations.
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  #3  
Old 05-15-2009, 04:19 PM
ForcedInduction
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There was an aftermarket TO4 flanged manifold on eBay a few years back. I have no idea who made it, thats the only one I've ever seen.
Its not well designed though. If you compare it to the picture below you'll see this manifold has sharp right angles in the exhaust port flow vs. the stock manifolds having gradual, smooth curves.


The easiest option is to get a manifold from a 78-79 300SD without an EGR. The tubes are much larger, lacks the EGR tube to disturb flow, its bolt-in, if you use the matching intake manifold it looks as if it never had an EGR (which is how it should have been) and the turbo flange is thicker which reduces its chance of cracking (You can kind of see the crack from the lower left stud going inwards on my EGR manifold).
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exhaust manifold options...-t04-manifold.jpg   exhaust manifold options...-noegrvsegr.jpg  

Last edited by ForcedInduction; 05-15-2009 at 04:42 PM.
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  #4  
Old 05-16-2009, 06:04 AM
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can the manifold turbo flange along with the exhaust ports be opened up at all? it looks like here is some area that can possibly be taken down or smoothed out more, and then on the turbo side too, than maybe a ceramic coating if both? thats what i was thinkning of doing on mine unless i can find one like the above u posted but theres not many mercedes diesels in the boneyards around here, so older stuff is hard to come by.
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1985 mercedes benz 300D turbo diesel
1998 VW GTI VR6
1996 VW GTI 2.0
1999 saab 9-3 turbo
1987 300sdl (sold)
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  #5  
Old 05-18-2009, 01:55 AM
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has anyone done any performance work with the manifold?
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1985 mercedes benz 300D turbo diesel
1998 VW GTI VR6
1996 VW GTI 2.0
1999 saab 9-3 turbo
1987 300sdl (sold)
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  #6  
Old 05-26-2009, 08:51 PM
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im gona try and find that manifold i dunno what kinda luck ill have but im gonna look gosh dangit!

do u think that ceramic coating is worth the price? either on the above posted manifold or the stock one if i cannot find that one?
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1985 mercedes benz 300D turbo diesel
1998 VW GTI VR6
1996 VW GTI 2.0
1999 saab 9-3 turbo
1987 300sdl (sold)
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Old 05-27-2009, 03:38 AM
ForcedInduction
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I've been wanting to use JetHot, but I can't justify the price.
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  #8  
Old 05-27-2009, 09:49 PM
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Quote:
Originally Posted by KarTek View Post
For mine, I designed my own manifold which I'm having fabricated by a local motorcycle shop that specializes in turbo installations.
Keeping it a secret from us? What flange did you spec?

My stock one has a small crack that is getting bigger every time I take a look so I'm probably going to take a similar route eventually. Can't bring myself to reinstall the K14-2 on a salvaged manifold - that turbo is embarrassing!
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Old 05-28-2009, 05:36 AM
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Quote:
Originally Posted by scott19_68 View Post
Keeping it a secret from us? What flange did you spec?

My stock one has a small crack that is getting bigger every time I take a look so I'm probably going to take a similar route eventually. Can't bring myself to reinstall the K14-2 on a salvaged manifold - that turbo is embarrassing!
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Benz Fleet:
1968 UNIMOG 404.114
1998 E300
2008 E63


Non-Benz Fleet:
1992 Aerostar
1993 MR2
2000 F250
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