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#1
11-27-2010, 05:21 AM
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4.6iS/4.8iS Tire and Differential Gearing Speed Calculator
4.6iS OEM Tire and OEM 3.91 Differential Gearing  4.6iS OEM Tire and "Performance Gearing" 4.44 Differential Gearing  Now I'm really interested in those 4.44 front and rear differential gearsets.  - J
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Previously owned: '03 4.6iS Dinan Supercharged Last edited by J.Belknap; 11-27-2010 at 07:39 AM. Reason: Adding pictures instead of excel file. 
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#2
11-27-2010, 05:49 AM
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And the same screenshots in metric.
4.6iS OEM Tire and OEM 3.91 Differential Gearing  4.6iS OEM Tire and "Performance Gearing" 4.44 Differential Gearing 
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Previously owned: '03 4.6iS Dinan Supercharged Last edited by J.Belknap; 11-27-2010 at 07:40 AM. Reason: Adding images.
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#3
11-27-2010, 07:24 AM
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Can't sleep.... so I went ahead and crunched some numbers for the 4.8iS 6HP26 transmission.
Standard Scale - 4.8iS OEM Tire and OEM 3.91 Differential Gearing  Standard Scale - 4.8iS OEM Tire and "Performance Gearing" 4.44 Differential Gearing  Metric Scale - 4.8iS OEM Tire and OEM 3.91 Differential Gearing  Metric Scale - 4.8iS OEM Tire and "Performance Gearing" 4.44 Differential Gearing 
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Previously owned: '03 4.6iS Dinan Supercharged Last edited by J.Belknap; 11-27-2010 at 07:41 AM.
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#4
11-27-2010, 09:45 AM
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So for the 4.6is we're looking at about a 500rpm difference in 5th at ~80mph... that ain't too bad, but would kill the gas mileage. I only get about 16.5 to 17.5 on the highway at that speed already, and I suspect it would bring me down to 14-15 mpg... But who am I kidding, this is far off the scope for me anyways with all the other shit going on in my life financially right now. Too many other projects.......
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"When you do things right, people won't be sure you've done anything at all" (Bender, futurama) You make something idiotproof, they'll make a better idiot You think professional is expensive, just wait until you pay for amateur. Never let your sense of morals prevent you from doing what is right. Examine what is said, not who speaks. X5 pics RIP 4.6is..... 2003 4.6is 
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#5
11-27-2010, 02:02 PM
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I've searched for hours and hours trying to find info on the 4.6iS front "VAG 174" differential and the "HAG 188K" rear differential. Didn't come up with much. The closest thing I could find for 4.44 gears that *should* work in the rear "mid-size" case was the 3310 8282678 RUMPF LL HA-GETRIEBE I=4,44 in one of the BMW Motorsports catalogs. The E70 3.0si has 4.44 gears yes? But I highly doubt that's the case. Haven't left many stones unturned on the 'net, but came up empty handed.
 I'll just kick back and wait for an e-mail from the pros at PG on Monday.I hear ya on the projects thing Weasel... man tax-time dollars are burning a hole in my pocket already! That's no good!
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Previously owned: '03 4.6iS Dinan Supercharged
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#6
11-14-2014, 03:16 PM
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Did anyone ever find out if 4.44 diffs or gears out of 3.0 are plug and play in a 4.6?
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 X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interiorDallas
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