4.45 FD Differential?

PrometheusM3 · 02-07-2013, 01:34 PM

Hey guys,

I know a lot of people here have experience with the 4.10 gears on the M3 6MT, but has anyone tried/heard anything about 4.45 gears? I noticed Turner has them for sale for the E92 M3.

I know the 4.10s give a 6.5% increase in torque to the wheels, so the 4.45s would give a 13% increase, of course at the cost of 13% lower top end/faster shifts. To me, the 4.45s might be a pretty powerful tool for a properly modified 6MT M3, getting twice the benefit of the gearing change versus a 4.10 setup. I come from the E46, where the 4.10 gears are a 13% change over stock, and many are happy with their gears.

Basically I'm thinking about trying these gears out and seeing how they are. I'm not worried about the top speed loss, because even 150mph is plenty fast for me. I'm actually thinking that the lower speeds in each gear will actually make the car a lot more fun at lower speeds around town.

Anyone know anything about them? Thanks in advance!

Vic311 · 02-07-2013, 01:45 PM

Are you certain that 4:45 gearing is for an e9x M3?

That would sure increase acceleration and torque..but you will also be reving much higher in all the gears..may be a bit much for the street not to mention higher gas consumption

PrometheusM3 · 02-07-2013, 01:49 PM

Quote:

Originally Posted by Vic311

Are you certain that 4:45 gearing is for an e9x M3?

That would sure increase acceleration and torque..but you will also be reving much higher in all the gears..may be a bit much for the street not to mention higher gas consumption

Yes I am certain, I was surprised as well. Here's the link to Turner.

Like you, I'm not sure how the benefits and negatives will weigh out. Just curious if there's any way to get some knowledge without trying them myself.

driftflo · 02-07-2013, 02:24 PM

yes, 4.45 is available from bmw motorsports.

Dave07997S · 02-08-2013, 10:47 AM

On a street car you don't want to go above 4.10s. Not unless you want to run slicks everywhere you go.

Dave

PrometheusM3 · 02-08-2013, 11:57 AM

Quote:

Originally Posted by Dave07997S

On a street car you don't want to go above 4.10s. Not unless you want to run slicks everywhere you go.

Dave

Thanks

02-07-2013, 01:34 PM	#1
PrometheusM3 Aquarian 10 Rep 298 Posts Drives: LSB E92 M3 Join Date: Oct 2008 Location: Orange County, CA iTrader: (0)	4.45 FD Differential? Hey guys, I know a lot of people here have experience with the 4.10 gears on the M3 6MT, but has anyone tried/heard anything about 4.45 gears? I noticed Turner has them for sale for the E92 M3. I know the 4.10s give a 6.5% increase in torque to the wheels, so the 4.45s would give a 13% increase, of course at the cost of 13% lower top end/faster shifts. To me, the 4.45s might be a pretty powerful tool for a properly modified 6MT M3, getting twice the benefit of the gearing change versus a 4.10 setup. I come from the E46, where the 4.10 gears are a 13% change over stock, and many are happy with their gears. Basically I'm thinking about trying these gears out and seeing how they are. I'm not worried about the top speed loss, because even 150mph is plenty fast for me. I'm actually thinking that the lower speeds in each gear will actually make the car a lot more fun at lower speeds around town. Anyone know anything about them? Thanks in advance! __________________ 2013 M3 Coupe Individual \| Laguna Seca Blue \| 6MT \| Black Extended \| Piano Black \| Moonroof MS Stage II Intake + Test Pipes \| Dinan Pulley \| BPM Tune \| Racing Dynamics Springs \| IND painted accessories \| ZCP Knob \| OSS Angel Eyes
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02-07-2013, 01:45 PM	#2
Vic311 Banned 42 Rep 1,463 Posts Drives: 2011 e92 M3 Join Date: Dec 2012 Location: NY iTrader: (0)	Are you certain that 4:45 gearing is for an e9x M3? That would sure increase acceleration and torque..but you will also be reving much higher in all the gears..may be a bit much for the street not to mention higher gas consumption
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02-07-2013, 02:24 PM	#4
driftflo Second Lieutenant 468 Rep 280 Posts Drives: M2 F87, M3 E92 & E46, C63, 911 Join Date: May 2012 Location: Europe iTrader: (0) Garage List 2018 BMW M2 F87 [0.00] 2008 BMW M3 E92 [0.00] 2003 BMW M3 E46 [0.00] 2012 BMW M3 E92 [0.00] 2011 Merc C63 AMG [9.00]	yes, 4.45 is available from bmw motorsports.
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02-08-2013, 10:47 AM	#5
Dave07997S Brigadier General 720 Rep 3,964 Posts Drives: 2020 Ford Mustang GT Join Date: May 2009 Location: El Segundo, CA iTrader: (1)	On a street car you don't want to go above 4.10s. Not unless you want to run slicks everywhere you go. Dave __________________ 2020 Ford Mustang GT 6MT PP1 444rwhp (Sold)2013 M3 Coupe-MR/BLK ZCP, 2011 M3 Coupe-MR/Blk 2007 Porsche 997C2S Speed Yellow/Blk sport seats 2004 BMW M3 Imola/Blk
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