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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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So many cars.. so little time!!
Old 06-16-2009, 06:15 AM
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Brian,

I thought this was a first peak at your new system! Great minds...


Quote:
Originally Posted by Dai View Post
Bob Holcombe's special.
Old 06-16-2009, 08:07 AM
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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
Old 06-16-2009, 08:20 AM
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here is my finished shot
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Ben

914-6 2.4s GT tribute.
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Old 06-16-2009, 02:04 PM
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Not as noisy as you might think, however I can't get in late undetected.
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Old 06-16-2009, 02:26 PM
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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 07:50 PM..
Old 06-16-2009, 07:20 PM
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Very nice Brian!

Keep up the good work!!!
Old 06-17-2009, 06:19 AM
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dual 38mm
Old 06-17-2009, 06:55 AM
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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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Old 06-18-2009, 05:04 AM
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Nice!
Old 06-18-2009, 05:54 AM
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That is CLEAN!
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Old 06-18-2009, 05:56 AM
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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....
Old 06-18-2009, 06:07 PM
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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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Old 06-18-2009, 07:20 PM
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Quote:
Originally Posted by 930gt-40r View Post
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.


Any shots of the underside?
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Old 06-18-2009, 07:21 PM
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Quote:
Originally Posted by DonE View Post
PLEASE tell me you won't put a 180 degree pipe off the muffler tho....
+1
Old 06-18-2009, 08:24 PM
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Quote:
Originally Posted by kenikh View Post
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).
On a turbo I suspect you can not tune the length to create any type of scavenging or tunning effect w a turbo. The turbo creates back pressure inhibiting any beneficial savaging. Further the type of cams we run on turbos w little to not overlap dose not benefit much from scavenging.

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.
Old 06-18-2009, 08:41 PM
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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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Old 06-18-2009, 09:37 PM
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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
Old 06-19-2009, 04:17 AM
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Quote:
Originally Posted by DonE View Post
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....

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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Old 06-19-2009, 04:35 AM
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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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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.....
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Old 06-19-2009, 04:55 AM
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