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-nick
Joined: 16 Nov 2002
Posts: 2699
Location: Cambridge, MA
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 Posted: Wed Apr 12, 2006 5:04 am Post subject: Turbo Exhaust 2.5" vs. 3.0" results on 951 |
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Thought this was quite relevant to us 931 folks-
http://forums.rennlist.com/rennforums/showthread.php?t=265014
The 3.0" made 4hp / 7ft-lbs on a bone stock 88 951 (cat bypass only, showing 209rwhp) and no reported difference in spool-up time.
Our 931's use the same 2.5" exhaust (with some different bends on the downpipe). I suppose we can cross "upgrade exhaust" off the list until approaching 210hp at the wheels!
nick |
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OutOfTheBox
Joined: 31 Mar 2006
Posts: 434
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| Posted: Wed Apr 12, 2006 7:30 am Post subject: |
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Drain pipe works best  |
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sequential
Joined: 18 Nov 2005
Posts: 500
Location: BANNED
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| Posted: Wed Apr 12, 2006 7:41 am Post subject: Re: Turbo Exhaust 2.5" vs. 3.0" results on 951 |
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| -nick wrote: | Thought this was quite relevant to us 931 folks-
http://forums.rennlist.com/rennforums/showthread.php?t=265014
The 3.0" made 4hp / 7ft-lbs on a bone stock 88 951 (cat bypass only, showing 209rwhp) and no reported difference in spool-up time.
Our 931's use the same 2.5" exhaust (with some different bends on the downpipe). I suppose we can cross "upgrade exhaust" off the list until approaching 210hp at the wheels!
nick |
YOU DO NOT NEED TO TOUCH THE EXHAUST UNTIL APPROACHING 300 WHP . JUST OPEN THE WASTEGATE TO VENT TO ATMO, THIS WILL HAVE THE SAME EFFECT AS THE LARGER EXHAUST.
_________________
928 gts prototype
baby blue engine block
steam in 1,2,3,4 sometimes
cold star issues while on stands
112 whp with new 4 valve head and MIS 2 |
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John Brown
Joined: 07 Nov 2002
Posts: 903
Location: Leesburg VA
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| Posted: Wed Apr 12, 2006 9:43 am Post subject: Re: Turbo Exhaust 2.5" vs. 3.0" results on 951 |
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| sequential wrote: | ...
YOU DO NOT NEED TO TOUCH THE EXHAUST UNTIL APPROACHING 300 WHP . JUST OPEN THE WASTEGATE TO VENT TO ATMO, THIS WILL HAVE THE SAME EFFECT AS THE LARGER EXHAUST. |
And it sounds really neat!! 
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John
80 931 - #931 44Cup
99 Escalade - tows track cars
gone but not forgotten: original 924.org car - 82 |
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flosho
Joined: 01 Jul 2004
Posts: 3160
Location: Eau Claire, Wisconsin
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| Posted: Wed Apr 12, 2006 11:37 am Post subject: |
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Hmm
I'm about 2 weeks from having a custom 3" exhaust built for my car too. I was expecting a few more HP's than four...
Oh well, does anyone have a suggestion for the type/brand of muffler to use to give a nice sound? I haven't heard many modified 931s...
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[This Space For Rent] |
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sequential
Joined: 18 Nov 2005
Posts: 500
Location: BANNED
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| Posted: Wed Apr 12, 2006 1:49 pm Post subject: |
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| flosho wrote: | Hmm
I'm about 2 weeks from having a custom 3" exhaust built for my car too. I was expecting a few more HP's than four...
Oh well, does anyone have a suggestion for the type/brand of muffler to use to give a nice sound? I haven't heard many modified 931s... |
USE STOCK 951 EXHAUST , OPEN WASTEGATE TO ATMO.
_________________
928 gts prototype
baby blue engine block
steam in 1,2,3,4 sometimes
cold star issues while on stands
112 whp with new 4 valve head and MIS 2 |
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flosho
Joined: 01 Jul 2004
Posts: 3160
Location: Eau Claire, Wisconsin
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| Posted: Wed Apr 12, 2006 1:53 pm Post subject: |
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| sequential wrote: | | flosho wrote: | Hmm
I'm about 2 weeks from having a custom 3" exhaust built for my car too. I was expecting a few more HP's than four...
Oh well, does anyone have a suggestion for the type/brand of muffler to use to give a nice sound? I haven't heard many modified 931s... |
USE STOCK 951 EXHAUST , OPEN WASTEGATE TO ATMO. |
Where does the stock 951 exhaust bolt on, on our cars? After the cat? or at the turbo? I dont think I'll be running the wastegate to the atmosphere until I hear what it sounds like first..
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[This Space For Rent] |
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Lizard
Joined: 03 Nov 2002
Posts: 9364
Location: Abbotsford BC. Canada
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| Posted: Wed Apr 12, 2006 2:14 pm Post subject: |
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the 951 exhaust bolts on after the Cat, and opening the wastegate to atmo sounds nice
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3 928s, |
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Raceboy
Joined: 01 Mar 2004
Posts: 2327
Location: Estonia, Europe
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| Posted: Wed Apr 12, 2006 3:37 pm Post subject: |
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I have stock 2,5" downpipe and stainless steel 3" after that with a straight through muffler that has 3" inlet and 3,5" outlet (no idea who made it though). I fabricated a short pipe from WG to atm too. I have to take some time and make a photoshoot session 
_________________
'83 924 2.6 16v Turbo, 470hp
'67 911 2.4S hotrod
'90 944 S2 Cabriolet
'78 924 Carrera GT replica
'84 928 S, sold
'91 944 S2, sold
'82 924S/931 "Gulf", sold 
'84 924, turbocharged, sold.
http://www.facebook.com/vemsporsche |
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N-Dub
Joined: 16 Jan 2006
Posts: 219
Location: Salt Lake City, Utah
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| Posted: Thu Apr 13, 2006 2:39 pm Post subject: |
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Magnaflow is the best sounding exhaust. Magnaflow was by far superior to the Flowmaster and Dynomax that I also had tested on my car before purchasing the Mag.
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'79 924 now Totaled! Carrera GT bodywork for sale!
'87 951 |
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