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Quote:
Originally Posted by RarlyL8 View Post
Many folks are stuck on bigger is better when it comes to primaries. I hope the quoted expert puts this idea to rest. My primaries for the 930 are 1.5"OD with 2" secondaries. This is calculated to aid velocity without choking volume at the HP levels that the system is designed for.
Right for the most part, but for the population looking to make bigger numbers can't use 1 1/2" or 1 5/8" primaries anymore and that is where 1 3/4" primaries come into play for me. For what I want to do- my setup is optimal (I want 7-750 at the tire on race gas or pump with methanol) and trust that I wouldn't have shelled the money without consulting with all of the heavy hitters first (Eddie B., TurboKraft, Dave at MS Road and race, AMS, and so on).
Now for a CIS car that is looking for 450 max, I completely agree- 1 5/8" is more than enough and 1 1/2" would offer great velocity to build boost quick.

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Kris @ Tech9
86' 930/GT-40R Sold
94' Rustang GT daily (long gone)
2008 C6/Z51 Corvette
Old 06-22-2009, 01:33 PM
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750whp is a whole different ballgame for sure. A lot more air has to blow through your engine! I was referring to some bad information floating around concerning the SSI system which also uses 1.5" primaries and was designed for CIS engine power levels. If a popular tuner sais it then it must be true ...
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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 06-22-2009, 02:40 PM
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I know all about the popular tuner thing- Some of my customers in the Evo and Sti circles buy all their products based around "oh well tuner "A" says that this is the best product..."
Brian- you hit your target market head on with your products and shouldn't change them at all.
When regarding the primary size like you are talking about, it depends upon what you want to do with the car. Velocity= responsive and Volume= up top. Best thing you can do as a manufacturer is offer a mix of products that saticfy both while not driving your material cost through the roof.
And speaking of which, when are the first production Rarlyl8 headers coming? (pardon me if I missed a post earlier)
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Kris @ Tech9
86' 930/GT-40R Sold
94' Rustang GT daily (long gone)
2008 C6/Z51 Corvette
Old 06-22-2009, 05:02 PM
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It is difficult to design a one-size-fits-all when you consider all of the modification possibilities. My products are modular so you can mix and match tailpipes etc.
The first headers will be built as described. Next will come 1 5/8" primaries and then 1 3/4" for the monsters. Secondary pipes will be modular so different turbos and wastegates can be used. This makes split volute turbos with twin wastegates an option as well.
Hope to have the header system ready to distribute by the end of July. I plan to bring one with me to Turbopalooza for show and tell.
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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 06-22-2009, 07:04 PM
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We should not be overly concerned w velocity through the primary and secondary tubes so much. There is not really any scavenging opportunity with a low overlap turbo cam and with the back pressure the turbo induces.

We are probably more interested in velocity at the turbo's turbine wheel. That is controlled by the wheel and housing sizes and design (split system?).

How fast we fill or pressurize the exhaust manifold leading to the turbo is more a function of the total "volume" of the manifold, including the pipe to the wast gate(s).

Then efficiency of the basic design be it equal / unequal length, un-necessary & or extreme bends, collector design, and or the ratio between the primary and secondary pipes then become important to effectiveness.

An equal length system is just by design going to have more volume. However it should be more efficient and have potential for a higher VE. Trying to reduce its volume by moderating the tubing sizes may not be the best course of action.

An un-equal length system by its nature has the potential to have less volume and the react or fill and pressurize faster. If boost onset is what is of utmost importance, an un-equal length would probably be the choice. Then if one wants to moderate the tubing size for even better low end response, so be it.

Old 06-22-2009, 07:45 PM
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wow this thread has gotten interesting. I can tell you this that once you see the final product everybody should be very impressed. I am suprised that no one has thought much of the collectors as we (M&K) spent hours and hours to get them right. I guess they are not shiney so less impressive? Anyhow stay tuned
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Old 06-23-2009, 05:15 AM
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Ben- Your collectors are mint and they speak for themselves- I didnt know that you guys were making them (please dont flame me..) and just figured they were Burns items (again please dont flame)

But yes they are not shinny and do not have the Porsche crest etched into them and they aren't platinum coated either... gosh!
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Old 06-23-2009, 05:39 AM
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and they won't carry the P-tax ...
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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 06-23-2009, 06:07 AM
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Nice collectors Brian. In your pursuit of damn near every free horsepower, are you going putting anti-reversion cones in the header exhaust ports?
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'85 930 Factory Special Wishes Flachbau
Werk I Zuffenhausen 3.3l/330BHP Engine with Sonderwunsch Cams, FabSpeed Headers, Kokeln IC, Twin Plugged Electromotive Crankfire, Tial Wastegate(0.8 Bar), K27 Hybrid Turbo, Ruf Twin-tip Muffler, Fikse FM-5's 8&10x17, 8:41 R&P
Old 06-23-2009, 06:27 AM
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my puppy. all the usual bits k27s, sports headers,964 cams etc etc yawn
Old 06-23-2009, 06:41 AM
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Quote:
Originally Posted by 930gt-40r View Post
Ben- Your collectors are mint and they speak for themselves- I didnt know that you guys were making them (please dont flame me..) and just figured they were Burns items (again please dont flame)

But yes they are not shinny and do not have the Porsche crest etched into them and they aren't platinum coated either... gosh!
321 ss of course and these will be mass marketed so more then just porsche which makes it make more sense
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914-6 2.4s GT tribute.
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Old 06-23-2009, 02:02 PM
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Old 05-18-2012, 03:45 PM
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A mates 964 with a highly modded 993 GT2 Evo lump, screw in cylinders amoung many other special bits...... Can run 2.0bar but comfortable at 1.5 and producing over 800bhp at that level! Bonkers motor!
Thought you may like the headers, hand formed Iconel loveliness







And then ceramic coated

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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
Old 05-18-2012, 05:09 PM
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Awesome set up.
Thanks for the pics.
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Old 05-18-2012, 06:22 PM
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Quote:
Originally Posted by JBL930 View Post
A mates 964 with a highly modded 993 GT2 Evo lump, screw in cylinders amoung many other special bits...... Can run 2.0bar but comfortable at 1.5 and producing over 800bhp at that level! Bonkers motor!
Thought you may like the headers, hand formed Iconel loveliness



Thanks for sharing Jonathan. Awesome.

Is it heat exchanger those boxes in the end of this picture?
See also it installed under the car in one picture. How is this attached?
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1979 930: Garret GT35r turbo, EFI, carerra intake, Link EMS, custom GT2 cams, 98mm JE P/C, 964 crank (stroker), custom valves & ported (XtremeCylinderHeads) etc..etc..
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Old 05-19-2012, 12:29 AM
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No idea how they are attached, but will ask for you..... Lovely set up though right, I love the fact they've used all four studs on the flanges, must be a pig to get on and off.....
My only disagreement with it is the waste gate exiting into the muffler, I would have had them straight out and loud..... It sounds great anyway!
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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
Old 05-19-2012, 04:31 AM
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Those boxes appear to bolt on like the ones for my headers.
Inconel is crazy material, SR71 stuff. Costs me several thousand dollars in materials alone to make one set of headers.
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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 05-19-2012, 05:41 AM
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He was paying 3.5k a day for the Judd engine Dyno time, and it was on the Dyno for a week, bit of a 'money no object' build...... Very cool car though, and properly quick

Last edited by JBL930; 05-19-2012 at 07:01 PM..
Old 05-19-2012, 08:57 AM
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not mine but been looking for info on this for awhile
Old 05-19-2012, 07:29 PM
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Quote:
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not mine but been looking for info on this for awhile
That car was in a recent issue of Total 911, Bisimoto built it. I have the magazine if you want to know anything specific.


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Old 05-19-2012, 07:45 PM
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