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Join Date: Mar 2006
Location: Metro DC
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Chris,
Thanks for posting.. that is the shot of this beauty I have been dying to see! Nothing like an "outlaw" with a nasty tude! Paul
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RGruppe #180 So many cars.. so little time!! |
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Location: Sacramento
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Crotchety Old Bastard
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My new system has some things in common with the Holcombe system pictured. After I designed it I started seeing a lot of convergent evolution. Makes since as we are after the same results. I should have some pictures to post this week.
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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 |
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Join Date: Jan 2003
Location: Burlington, Wisconsin
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here is my finished shot
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Ben 914-6 2.4s GT tribute. 914-6werkshop.com manufacturer of 914-6, GT, Conversion parts |
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Join Date: Feb 2008
Location: Bayside Wi
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Not as noisy as you might think, however I can't get in late undetected.
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Anthony @ Voitureltd Bayside WI. |
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Crotchety Old Bastard
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Work in progress:
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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 Last edited by RarlyL8; 06-16-2009 at 08:50 PM.. |
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Registered User
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Location: Sacramento
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Very nice Brian!
Keep up the good work!!! |
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930 Turbo
Join Date: Apr 2008
Location: New York
Posts: 74
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![]() dual 38mm |
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Registered
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Here is the setup going on my car this year. 1" 3/4 primaries into 2" 1/4 secondaries into a divided T-4 flange.
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Kris @ Tech9 86' 930/GT-40R Sold ![]() 94' Rustang GT daily (long gone) 2008 C6/Z51 Corvette |
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Location: Sacramento
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Nice!
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3 restos WIP = psycho
Join Date: Feb 2005
Location: North of Exit 17
Posts: 7,739
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That is CLEAN!
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- 1965 911 - 1969 911S - 1980 911SC Targa - 1979 930 |
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Wo ist die Rennstrecke?
Join Date: Mar 2004
Location: Brooks, GA
Posts: 1,211
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Kris - that's the nicest performance stuff so far- nice short pipes, great looking collectors, great wastegate circuit. PLEASE tell me you won't put a 180 degree pipe off the muffler tho....
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3 restos WIP = psycho
Join Date: Feb 2005
Location: North of Exit 17
Posts: 7,739
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A question on header design for turbos. Is shorter length always better on equal length headers? For example, say you have some headers that have tuned runners for your displacement and rev range (NA).
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- 1965 911 - 1969 911S - 1980 911SC Targa - 1979 930 |
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3 restos WIP = psycho
Join Date: Feb 2005
Location: North of Exit 17
Posts: 7,739
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Any shots of the underside?
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- 1965 911 - 1969 911S - 1980 911SC Targa - 1979 930 |
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Quote:
The goal is more to allow the exhaust pules to exit in an orderly more efficient progression. This helps more in the upper rpm operation. The advantage to the shorter unequal length is packaging and reduced header volume that has to be pressurized to accelerate the turbo. The unequal length primaries also create a convergence of the exhaust pulses that can also help accelerate the turbo quicker. On the header system you show it looks like each side is kept separate. This is to help turbo spin up. It is more effective to do this on a 4 cylinder. Not much advantage on an 8 cylinder. On a 6 it is not as big a deal I hear. Still, I would go for it. At least that is how I think it works. ![]() |
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Thank you guys for the compliments
![]() Don: F--- no, not to worry, there will never be a 180 off that system. I am going to fab a muffler for it in the next month that will entail a 3 to 4 transition, a burns 4" muffler, 4" 90 degree out the back of the car, and finally a 4 to 3 transition to keep some of the pulses canceled out as to try to keep the cops away. Yes, the days of original exit exhaust are long gone haha 911st: I agree, I never understood how scavenging could be even remotely effective in the case of having a good amount of back pressure (the turbo). I also didn't have giant equal length headers made because its a hell of a lot of work for the fab guy. Kenikh: thanks for your compliments ![]() Now a word about the fabricator- I specified what I wanted in these headers (1 3/4" primaries, 2 1/4" secondaries, twin V44s, and divided T-4 flange) but this is where my input ended. All the fab work you see was performed by John at 666 Fabrication in Milford Connecticut. John took my specs into consideration and ran with it to create what you see in the picture. When I tell you this guy does some serious work I mean it- he makes intake plenum's as well that are to die for (not for our cars....yet...).
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Kris @ Tech9 86' 930/GT-40R Sold ![]() 94' Rustang GT daily (long gone) 2008 C6/Z51 Corvette |
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Crotchety Old Bastard
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Fabricators would not go to the tremendous trouble and expense of creating equal length headers for no reason ...
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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 |
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Location: Burlington, Wisconsin
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Quote:
His system is nice but not truely equal length which lends to not the best performance . I find this baffeling as many many tuners do this but does not hold up to theory.
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Ben 914-6 2.4s GT tribute. 914-6werkshop.com manufacturer of 914-6, GT, Conversion parts |
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Infidel
Join Date: May 2006
Location: UK
Posts: 1,172
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My old girl is in having some detailing done, back end was looking scabby! I wouldn't class this as a "SICK" exhaust pic, but tell me how many other stock looking 930's you've seen with 993tt engines in
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Jonathan. 87 930, 993 turbo engine, RS Tuning 520PS/515lbf-ft, Arrow Rods, ARP hardware, Solid lifters, G50-50, RS Flywheel, 890nm Sachs clutch, RSR coil overs all round, 993 C4 calipers front, 930 fronts on the rear, Ruf Speedlines..... Old 540 BMW, XB12S Modified, for being a total hooligan ![]() |
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