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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 11-02-2011, 07:39 PM   #21
Rob43
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Cool video, can't understand 3/4 of what he's saying, but still worth watching.





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Nitrous is a little trickier than boost, but it's not the spray that kills motors, it's STUPIDITY!!
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Old 11-02-2011, 09:18 PM   #22
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...meaning it wears, right? What kind of diff is in M3? 25%, 40%, variable?
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Old 11-08-2011, 10:56 PM   #23
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what if i want a 3.15 with a quaife already installed so i can just throw it in when it gets to my door? what type of diff is performance gearing using? O and i have a 330 6 speed so will my driveshaft work?
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Old 11-08-2011, 11:17 PM   #24
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what if i want a 3.15 with a quaife already installed so i can just throw it in when it gets to my door? what type of diff is performance gearing using? O and i have a 330 6 speed so will my driveshaft work?

You can have Performance Gearing or Diffsonline build what ever you like, it's just a matter of money. Also, there may be shops in your area that have the skill to to build you a great diff. Give great consideration to building a 3.38 or 3.46, because you have a 6 speed. A 3.38 or 3.46 in a 6 speed will feel like my Quaife 3.15 in my 5 speed.
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Rob #43 ITS/ITR/STU, BMW 325I, STU LAP RECORD
SUMMIT POINT WV 1:24:229 S.C.C.A.
(DynoDynamics https:vimeo.com/8486878 Dyno Video)
"Chance Favors The Prepared Mind"

Need Help With Your Nitrous Ambitions ?.....PM ME
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Originally Posted by RacerX View Post
Nitrous is a little trickier than boost, but it's not the spray that kills motors, it's STUPIDITY!!
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Old 11-08-2011, 11:27 PM   #25
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Yea Im just asking if I were to go to performance gearing's site and order one right now what would the internals be, I can't find it anywhere on there as to what internals they use and I want a quaife since this will be a street car. And I considered the idea of 3.46 or 3.23 (used to have 3.38 in my 5spd it was awesome) but I plan to go FI in the future and don't want too short of gears.
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Old 11-08-2011, 11:33 PM   #26
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Just give them a phone call tomorrow.
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Rob #43 ITS/ITR/STU, BMW 325I, STU LAP RECORD
SUMMIT POINT WV 1:24:229 S.C.C.A.
(DynoDynamics https:vimeo.com/8486878 Dyno Video)
"Chance Favors The Prepared Mind"

Need Help With Your Nitrous Ambitions ?.....PM ME
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Nitrous is a little trickier than boost, but it's not the spray that kills motors, it's STUPIDITY!!
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Old 11-09-2011, 12:16 PM   #27
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Performance Gearing uses a clutch-style, similar to diffsonline or OS Giken. Give Jim a call, he's great to work with. Make sure he understands your application.
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Old 11-21-2011, 08:30 AM   #28
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hey all, i am just wondering if anyone has any ratios higher than the 3.64. its all the same price on performance gearing from the 3.64 to 4.10 so jw if anyone has experience with a higher ratio.
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Old 11-21-2011, 06:07 PM   #29
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I went to 4.10, and don't recommend it. To do it again I woulddo 3.83 (or close to it)
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Old 11-21-2011, 06:30 PM   #30
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What is the gearbox? For 5 spd even 3.64 is way too aggressive. Even 3.46 is too aggressive.

Last edited by Nervous; 11-21-2011 at 09:12 PM.
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Old 11-21-2011, 06:55 PM   #31
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good point on the gearbox
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Old 11-21-2011, 07:13 PM   #32
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What is the gearbox? For 5 spd even 3.62 is way too aggressive. Even 3.46 is too aggressive.
3.46 isn't to aggressive, unless you plan on driving over 80mph a lot
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Old 11-21-2011, 09:11 PM   #33
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3.46 isn't to aggressive, unless you plan on driving over 80mph a lot
Calculate and decide yourself: http://www.bokchoys.com/differential...calculator.htm

For me, 3500 rpm at 75 mph is WAY too aggressive.... On 3.64 it will be 3675 rpm...
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Old 11-22-2011, 02:08 AM   #34
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well its an automatic, so im starting with a 3.46... also im living in texas so going over 80 is a regular occurance. i also have the conforti software so ive bumped the rev limit to 7000. maybe the 3.91?? which puts me at 3101 cruising at 80 mph
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Old 11-22-2011, 07:14 PM   #35
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mine's an auto, 3.91 would be my max, 3.8x would be optimum
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Old 11-23-2011, 02:39 AM   #36
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cool, thanks for the advice guys.
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