► LSD's @ Performance Gearing - BMW 3-Series (E90 E92) Forum

ZSP.3R · 05-16-2010, 03:17 AM

I was browsing through the forum looking for LSD threads and stumbled upon a shop that sells them for all model BMW's... Couple of months back, people were talking about how they ONLY made these LSD's for 335 models. Well, not true

and now considering the upgrade.

$2,500US to $3,000US upgrade; 3 year warranty + unlimited mileage!

Just curious to know what the "final drive limited slip #" means?

.

VTECaddict · 05-16-2010, 03:50 AM

The final drive is the last reduction gear that power is transferred through in the drivetrain before it gets sent out to the wheels (ie, the differential). The higher the gear ratio (number) is, the shorter the gear is, and the higher the engine will rev for a given speed.

For example, lets say you swapped the stock 330i 3.15 ratio diff for one with a 4.10 ratio (the shortest one on that list). In 6th gear at 65mph with the stock diff, you would be turning about 2500rpm. With the 4.10 ratio diff, the engine would be running at about 3200rpm.

Shorter gear ratios can improve acceleration and in effect put more power to the ground, but it also means the top speed in each gear will be reduced and MPG will suffer accordingly due to increased RPMs.

ZSP.3R · 05-16-2010, 04:43 AM

^^ Understood and approved!

Thanks for answering!

.

05-16-2010, 03:17 AM	#1
ZSP.3R Montreal R-Spec Drives: 'O6 330i Sport Package Join Date: May 2010 Location: Montreal Posts: 163 iTrader: (0)	► LSD's @ Performance Gearing I was browsing through the forum looking for LSD threads and stumbled upon a shop that sells them for all model BMW's... Couple of months back, people were talking about how they ONLY made these LSD's for 335 models. Well, not true and now considering the upgrade. $2,500US to $3,000US upgrade; 3 year warranty + unlimited mileage! Just curious to know what the *"final drive limited slip #"* means? . __________________ MARK ALEXANDER ▀▄ 'O6 330i \| 6MT \| Black Sapphire Metallic \| Black Dakota Leather \| Aluminum Trim \| Sport Package \| Premium Package \| Cold Weather Package \| 162's \| Adaptive Bi-Xenon's \| Depo Blacklines \|
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05-16-2010, 03:50 AM	#2
VTECaddict Where'd my VTEC go? Drives: 06 330i 6MT Join Date: Mar 2009 Location: Orange County, CA Posts: 4,031 iTrader: (3)	The final drive is the last reduction gear that power is transferred through in the drivetrain before it gets sent out to the wheels (ie, the differential). The higher the gear ratio (number) is, the shorter the gear is, and the higher the engine will rev for a given speed. For example, lets say you swapped the stock 330i 3.15 ratio diff for one with a 4.10 ratio (the shortest one on that list). In 6th gear at 65mph with the stock diff, you would be turning about 2500rpm. With the 4.10 ratio diff, the engine would be running at about 3200rpm. Shorter gear ratios can improve acceleration and in effect put more power to the ground, but it also means the top speed in each gear will be reduced and MPG will suffer accordingly due to increased RPMs. __________________ AW/Terra \| ZSP \| ZPP \| ZCW \| iDrive \| CA Mods: KW V2 \| OEM Blacklines \| M-tech rear \| custom dual exhaust \| M3 steering wheel \| BMW SSK \| ZHP shift knob \| BMW Performance rep spoiler Varrstoen ES1 19x9.5+20 Front, 19x11+25 rear

05-16-2010, 04:43 AM	#3
ZSP.3R Montreal R-Spec Drives: 'O6 330i Sport Package Join Date: May 2010 Location: Montreal Posts: 163 iTrader: (0)	^^ Understood and approved! Thanks for answering! . __________________ MARK ALEXANDER ▀▄ 'O6 330i \| 6MT \| Black Sapphire Metallic \| Black Dakota Leather \| Aluminum Trim \| Sport Package \| Premium Package \| Cold Weather Package \| 162's \| Adaptive Bi-Xenon's \| Depo Blacklines \|

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