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Eye of the Toiger
 
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Join Date: Oct 2005
Location: Sydney, Australia
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will a GSF 1.65 OD headers fit a 3.6

Is a 1.65 primary too restrictive on a 3.6 turbo? I know that GSF headers are not as good as others etc.. but I am restricted by budget and can get a set locally, cheap.

I was planning on buying a K27s or HF from Brain, so I'd look at getting a set of Brians headers down track.

Matt
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1973 911 RSR clone powered by 77 3.0 turbo
Old 03-16-2010, 03:25 PM
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E-85 sippin drunk
 
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That is what I am running on mine.. (Just got the set from Brian)... Remember, these are turbo engines... yes they need to breathe, but we also have to keep exhaust velocity up. Personally, I would not go any bigger....
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Old 03-16-2010, 07:00 PM
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Crotchety Old Bastard
 
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Primary/secondary optimum size depends on a lot of things. Most importantly how much air will blow through the engine; boost level, redline RPM and anticipated HP at xRPM. Displacement is much less a factor than these others.
You need to match your exhaust port size so if you use the GSF take the time to cone the gasket protectors so you have smooth transition from the heads to the primaries.
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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 03-16-2010, 08:03 PM
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Some GSFs don't fit regardless...
Old 03-17-2010, 05:16 AM
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Porsche-Poor
 
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Is GSF still in business? That guy scammed me. . .
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1979 911 RS clone hotrod
1983 930 turbo-sold, will be missed
1992 964 C2 Coupe-regrettably sold
1980 911 SC Weissach-regrettably sold
1975 911S-sold but not forgotten
Old 03-17-2010, 11:36 AM
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It is to seriously address this issue. Quality above than the price.
Old 03-17-2010, 12:01 PM
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Eye of the Toiger
 
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I'm talking (1.625") OD. It seems a little small for 993 heads. If I go the stock 993 headers and M&K Y pipe I need 2 waste gates, what waste gates do you guys use? Stock or can I use a pair of Tial WG
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Last edited by matty74; 03-17-2010 at 02:39 PM..
Old 03-17-2010, 02:36 PM
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Crotchety Old Bastard
 
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I use 38mm TiAL on all my dual wastegate setups.
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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 03-17-2010, 07:04 PM
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Eye of the Toiger
 
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Is 1.625 OD so 38mm ID too restrictive on a 3.6 turbo?
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1973 911 RSR clone powered by 77 3.0 turbo
Old 03-17-2010, 08:10 PM
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Crotchety Old Bastard
 
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Depending on the build, 1.625" may be too large. Your boost level, amount of air blown through the engine (turbo and porting), redline, xHP @ xRPM goals all affect design for maximum exhaust velocity without choking the engine. With your large heads you would want to open up the gasket protectors and flange area for a smooth transition.
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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 03-18-2010, 04:13 AM
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