05 645Ci 6spd Track Car - Bimmerfest - BMW Forums



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E63 / E64 6 Series (2004 - 2010)
The E63/E64 BMW 6 Series builds on BMW's sporty heritage with aggressive lines and an incredible motor to back the design up. Available in coupe and convertible trims with a standard 4.8 liter engine producing 360 horsepower and 360 lb-ft of torque, the 6-series is a popular choice that exceeds expectations.

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  #1  
Old 08-29-2019, 10:08 PM
sixshooter645 sixshooter645 is offline
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05 645Ci 6spd Track Car

I wanted to introduce myself to the forum, and maybe use this as a place to keep a build log of sorts. I am the proud owner of an 05 6spd 645Ci. I have a few mods done to the car that I will touch on. I have done 3 track days so far, and I plan on doing more.

Mod List:
PowerStop Track Day Pads (front and rear), available on RockAuto
Generic Blank Rotors (AutoZone, Centric)
ATE Type 200 Brake Fluid
Custom Catback exhaust (all resonators deleted, 2 Vibrant mufflers to replace stock mufflers)
Apex Racing ARC-8 Wheels (19x8.5 ET20 Front, 19x9.5 ET22 Rear)
Yokohama Advan V105 Tires (255/40/R19 Front, 285/35/R19 Rear)
Fortune Auto MSC-1 Way Coilovers (9k springs front, 7k springs rear)
German Auto Solutions Monoball Thrust Arm Bushing
A little bit of coding here and there (AUX retrofit, etc.)

I would be more than happy to give a quick review on the mods I have on my car if people would be interested. I could definitely touch on how the car performs on track as well.

(red hot brakes in the attached photo)
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  #2  
Old 09-02-2019, 09:53 AM
FredoinSF FredoinSF is offline
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Welcome!
6 speeds are great. Love the red hot rotors in the picture.


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Old 09-04-2019, 06:23 AM
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Hsurf Hsurf is offline
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Mein Auto: E63 645ci
Great pic and nice mod list too .
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Old 09-15-2019, 09:24 PM
The Thomas J The Thomas J is offline
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Mein Auto: 2004 645 convertible
The red hot rotors make the car.
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Old 10-14-2019, 09:16 AM
e63fn e63fn is offline
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Thank you! Finally someone else who tracks their non-M 6'er. I do track nights and some club events when my vette isn't running. What are you doing about the diff? I can't imagine loading uphill with an open diff. That was my first mod - a Wavetrac LSD with 2.88 gears. With DSC disabled it gets a little sideways before DTC kicks in, with DTC disabled it's drift time! Nice work, keep it up!

Here's a video of the 6 at NHMS road course in south oval config. Turn 4 uphill is impossible without LSD.

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Old 10-17-2019, 03:02 PM
sixshooter645 sixshooter645 is offline
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Quote:
Originally Posted by e63fn View Post
Thank you! Finally someone else who tracks their non-M 6'er. I do track nights and some club events when my vette isn't running. What are you doing about the diff? I can't imagine loading uphill with an open diff. That was my first mod - a Wavetrac LSD with 2.88 gears. With DSC disabled it gets a little sideways before DTC kicks in, with DTC disabled it's drift time! Nice work, keep it up!

Here's a video of the 6 at NHMS road course in south oval config. Turn 4 uphill is impossible without LSD.

For the track days I have done I was running the stock open diff. I did notice some wheel spin coming out of the tighter/lower speed turns. The only track I have run (Autobahn Country Club) does not have a ton of elevation change, so it was not a huge problem. Currently I am working on swapping in a M6 diff. I have been successful so far and will be sure to post a write-up on the forum once I am done with the swap.
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Old 10-18-2019, 07:34 AM
e63fn e63fn is offline
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Quote:
Originally Posted by sixshooter645 View Post
For the track days I have done I was running the stock open diff. I did notice some wheel spin coming out of the tighter/lower speed turns. The only track I have run (Autobahn Country Club) does not have a ton of elevation change, so it was not a huge problem. Currently I am working on swapping in a M6 diff. I have been successful so far and will be sure to post a write-up on the forum once I am done with the swap.
I found the M6 diff swap to be too labor intensive for my taste when I attempted it. I recall either the main or axle drive shafts didn't match up and would have to be replaced. Was easier, although more costly, to use a stock diff housing with the swapped internals.
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