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#11
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When choosing headers for FI, the headers should have the shortest tube length possible, and Tri-Y is not needed. The Dinan headers were designed to be the "icing" on the supercharger "cake". A major advantage of minimum length primary tubes is less heat soak underhood (running FI increases underhood temps, the added surface area of equal length primaries adds even MORE heat underhood). Equal length Tri-Ys are best suited to non-FI engines. Those who have tried to "chase" a few extra HP by optimizing exhaust pulse/merge/flow with FI, have found little gain after significant effort/cost. A simple pulley change will give you all the HP you could ever want, enough to grenade the motor.
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'03 X5 4.4 Sport, last of the M62s (8-03 build date) I believe in deadication to craftmanship in a world of mediocrity! Last edited by TiAgX5; 06-20-2016 at 10:12 AM. |
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#12
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Quote:
Or changing gear ratio. |
#13
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Pretty neat!
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Previously owned: '03 4.6iS Dinan Supercharged |
#14
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TiAgX5--- I honestly don't know. I will say that I trust Jed and from what I've read, have heard nothing to indicate that anyone has convinced him to change a thing. If you're correct, I'm guessing the difference on a real-world daily driver would be hard for me to notice at the wheel and at that level of perfection, I should have replaced the crank and pistons with lightweight versions and done a full extrusion hone on the heads to maximize flows, I did not. I'm just looking for the best I can get without building the space shuttle.
J. Belknap--- Thanks. How's your X doing? Love reading the story of how you landed that rig and got it home. Crystalworks--- who knows. Dyno, dyno, dyno. I'll know then. I have found a slight difference in a domestic hp number compared to a German hp number in comparable displacement engines. If you've seen the inside of a 4.6is exhaust manifold, you'll know that just about anything should be better. If anyone thinks that bmw didn't half-ass the exhaust manifold on the 4.6is, check this garbage out. Anything would be better.
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'03 4.6is (the wife' s ride) Last edited by Plattus1000; 06-20-2016 at 11:46 PM. |
#15
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The X5 is doing great, Plattus, thanks. I just do regular maintenance, tiny improvements on the Dinan stuff and drive it a ton!
My exhaust is stock other than Tubi catback, but if the cats go I will replace them with some 200 cell HJS units. Very quiet at idle and smooth roar at WOT. I imagine the sound from those headers is loud.
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Previously owned: '03 4.6iS Dinan Supercharged |
#16
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We'll see soon enough. Love your rig by the way. Yours an BCredliner's are benchmarks. A few others too but from my first days reading in here, you two stuck out. My wife still won't let me mess with her exhaust. It's kill'n me.
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'03 4.6is (the wife' s ride) |
#17
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Quote:
It looks nice and is probably a high-margin component for Dinan, though.
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2001 E53 3.0 5pd |
#18
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I'll let you know what I get on the dyno as soon as they arrive.
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'03 4.6is (the wife' s ride) |
#19
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Pretty headers!
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Kirk Las Vegas 2016 X5 40e Mineral White/Black Dakota Leather, ZLL, ZCW, ZDA, ZDB, ZPP, multi contour seats, rear side window shades, HK stereo 2011 E90M3, 6-speed manual |
#20
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Love the workmanship and attention to details that are NOT normally found anywhere in the aftermarket. Nice work!
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2005 X5 4.8IS The Blue ones are always FASTER.... Current Garage: 2005 X5 4.8is 2002 M5 TiSilver 2003 525iT 1998 528i Former Garage Stable Highlights 2004 325XiT Sport 1973 De Tomaso Pantera, L Model 1970 Dodge Challenger T/A 4 sp Alpine White 1970 Dodge Challenger T/A 4 sp GoManGo Green 1971 Dart Sport, “Dart Light” package 1969 Road Runner 383 1968 Ply Barracuda 340S FB Sea-foam Green |
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