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#121
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Do whatever suits your system/tastes/etc best. I'm just enjoying following your progress.
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2005 X5 4.4i Build 04/05 Maintenance/Build Log Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles) 2006 X5 4.8is Build 11/05 Maintenance/Build Log Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles) 2010 X5 35d Build 02/10 Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles) |
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#122
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I have the cutouts mounted at equal length from exhaust manifolds, just past the cats to eliminate as much of the back pressure as cutouts are capable of doing. Exhaust is Dinan which is less restrictive than IS exhaust.
With an LS turbo application such as yours the first thing I would do is research what type of exhaust allows the LS to perform the best so I didn't have to break new ground. Left on my own I wouldn't run exhaust out the back. I would exit behind the front or rear passenger*door, probably behind the rear door. I wouldn't split the exhaust back to two pipes. I would use the largest single pipe I could and use the largest compatible cutouts. I know there are 5 inch options out there. It's all custom exhaust but any stock exhaust or aftermarket options would have to be modified anyway.
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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior Dallas |
#123
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#124
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The switch would activate a vacuum solenoid in the same manner a switch would activate an electric cutout motor.
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2005 X5 4.4i Build 04/05 Maintenance/Build Log Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles) 2006 X5 4.8is Build 11/05 Maintenance/Build Log Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles) 2010 X5 35d Build 02/10 Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles) |
#125
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Crystalworks is correct. Without a switch there would be no control over the opening and closing. The cutouts would be opening and closing based on vacuum present, entirely on their own.
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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior Dallas |
#126
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Yep. Pretty sure thats what OP was referring to. When in boost, the cutout opens. When not in boost the cutout is closed. A popular mod, that involves no switches.
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#127
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Correct. Also keeping it quiet around town and if I'm down on power to 300rwhp out of boost with factory x5 mufflers it will still be plenty fast and once the car starts to build boost the cutouts open thus me having no restriction at all. I still haven't decided that I'm doing this exact exhaust setup but it's definitely one of my top choices.
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2002 BMW X5 4.6is soon to be LSX swapped. Silver on Imola 2003 BMW X5 3.0i 5 Speed Manual, Sport Pkg, 190,xxx miles and counting. Black/ Black 20" 4.6is Wheels, OEM Stainless Steps, ZHP Shift Knob |
#128
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Ah, yes. Similar to the exhaust flaps on e46's, and I'm sure other BMW mufflers. I assumed OP would want control over the flaps... though I guess he still does, with his right foot.
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2005 X5 4.4i Build 04/05 Maintenance/Build Log Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles) 2006 X5 4.8is Build 11/05 Maintenance/Build Log Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles) 2010 X5 35d Build 02/10 Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles) |
#129
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Quote:
Vacuum is the greatest when the engine is idling. As RPMs increase vacuum decreases. Vacuum varies somewhat by engine, condition of engine and where the hose is connected so it would be very difficult to offer anything but vehicle specific models. Do you have a link to cutouts that have no switch? Cutouts reduce restriction but do not eliminate it. The engine is restricted by the stock exhaust manifolds, by the size of the exhaust pipes and by the cats that should be before the cutouts. Headers are always a much better performance option.
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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior Dallas Last edited by bcredliner; 12-07-2018 at 08:08 PM. |
#130
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awesome build. I signed up just to give you props (and possibly have a chat at some point if you have time). Cant wait to see it finished.
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