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      02-13-2014, 04:52 PM   #1
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2015 BMW M4  [2.75]
6MT Race Build: OS Giken Race Clutch/Flywheel, Solid Bushings & CAE Chassis shifter

Just kicking into high gear on the race build, just wanted to show a quick teaser some parts before being installed.



OS Giken Clutch/Flywheel


Ultimate Clutch Pedal


CAE Shifter


The chassis shifter requires solid bushings installed beforehand to limit movement, here's a quick sneak peek of the rapid prototypes (RPs) being test-fitted and verified before the production pieces get milled:

Rear Subframe RP


Differential RP


The combo should make for a near bulletproof package and take extended abuse we have intended for it.
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      02-13-2014, 05:04 PM   #2
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Awesome! Sub'd! I'm looking forward to watching this build. Who's cage is that? Looks a lot like one of Turner's.
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      02-13-2014, 05:30 PM   #3
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Edit: Just seen those are rapid prototypes.

Last edited by dereksM3; 02-13-2014 at 05:56 PM.
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      02-13-2014, 06:07 PM   #4
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are you going with coated bearings and ARP conrod bolts?
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      02-13-2014, 06:10 PM   #5
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first pic is so EPIC!
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      02-13-2014, 06:15 PM   #6
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looks awesome!

those shifters really only require poly (at a min) or solid motor/trans mounts for anyone who wants to use one on a street car. Doing all of them is a plus though.

That first pic is sick!
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      02-13-2014, 06:19 PM   #7
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This is going to be legendary
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      02-13-2014, 06:20 PM   #8
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love it.
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      02-13-2014, 06:40 PM   #9
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Quote:
Originally Posted by Bear From Jax View Post
Awesome! Sub'd! I'm looking forward to watching this build. Who's cage is that? Looks a lot like one of Turner's.
Precision Chassis works in AZ did the fabwork on the cage.

Quote:
Originally Posted by REDBULL View Post
are you going with coated bearings and ARP conrod bolts?
Did the rod bearings just last week, went with ARP bolts and WPC treated bearings. Also had the oil pan shipped off to VAC for their baffle kit to be installed.

Here's a peek inside:



Quote:
Originally Posted by s85e90 View Post
looks awesome!

those shifters really only require poly (at a min) or solid motor/trans mounts for anyone who wants to use one on a street car. Doing all of them is a plus though.

That first pic is sick!
You're absolutely right, poly would work as well - I should have clarified. Since this will never see street use - all bushings will be replaced for aluminum.
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      02-13-2014, 09:43 PM   #10
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insane!
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      02-14-2014, 12:23 AM   #11
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That OS Giken is a bad bitch. I'm curious to get y'alls feedback on pedal feel once it is driven. What's the TQ rating on that particular model, and is the flywheel lightened or stock weight?
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Not stock.
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      02-14-2014, 04:01 AM   #12
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OMG
This is going to be sick Tom !
Can't wait to see it done. More pics plz
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      02-14-2014, 09:59 AM   #13
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Can't wait to see finished product.
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      02-14-2014, 01:29 PM   #14
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Quote:
Originally Posted by whats77inaname View Post
That OS Giken is a bad bitch. I'm curious to get y'alls feedback on pedal feel once it is driven. What's the TQ rating on that particular model, and is the flywheel lightened or stock weight?
I ran this spec OSG for 20k miles on my daily driven E92. Pedal is HEAVY . I've since gone back to OEM clutch + flywheel
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      02-14-2014, 01:38 PM   #15
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2015 BMW M4  [2.75]
Quote:
Originally Posted by whats77inaname View Post
That OS Giken is a bad bitch. I'm curious to get y'alls feedback on pedal feel once it is driven. What's the TQ rating on that particular model, and is the flywheel lightened or stock weight?
There are not many clutch options for M3, but we went with the clutch since we'll be installing an OS Giken LSD as part of this build, as well as being local to our facility.

Clutch/Flywheel assembly is slight lighter than stock, not by much. Turner also uses the same clutch on their Grand Am cars, I'll get you some feedback once we get all the components installed.

Almost a shame to cover this up, the pieces are simply beautiful.
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      02-14-2014, 01:40 PM   #16
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Quote:
Originally Posted by tom @ eas View Post
There are not many clutch options for M3, but we went with the clutch since we'll be installing an OS Giken LSD as part of this build, as well as being local to our facility.

Clutch/Flywheel assembly is slight lighter than stock, not by much. Turner also uses the same clutch on their Grand Am cars, I'll get you some feedback once we get all the components installed.

Almost a shame to cover this up, the pieces are simply beautiful.
Cool beans, thanks! And you and I are in agreement....that's a bad looking bitch

Last edited by whats77inaname; 02-14-2014 at 01:48 PM.
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      02-14-2014, 01:43 PM   #17
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Quote:
Originally Posted by whats77inaname View Post
Cool beans. I know that SPEC makes a lightened flywheel for the E9x M3. Any reason in particular you guys didn't go that route?
No specific reason, but like to keep things matched as much as possibly to eliminate any variables. Support goes a long way, it's really convenient when we can work with companies that are local and deal with one-on-one in person.

We'll see how this system performs and look into other options if there are possible improvements to be made.
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      02-14-2014, 01:52 PM   #18
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This is just a wonderful build! Thanks for sharing with the community.
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      02-14-2014, 01:54 PM   #19
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Quote:
Originally Posted by tom @ eas View Post
No specific reason, but like to keep things matched as much as possibly to eliminate any variables. Support goes a long way, it's really convenient when we can work with companies that are local and deal with one-on-one in person.

We'll see how this system performs and look into other options if there are possible improvements to be made.
Great call on the VAC baffled oil pan mod.

Tom can you weigh the clutch assembly, and if possible the flywheel and disc assembly separately? I've got weights for OEM and aftermarket ACT clutch. Maybe it's time to start an aftermarket clutch wiki thread.
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      02-14-2014, 01:56 PM   #20
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Great call on the VAC baffled oil pan mod.

Tom can you weigh the clutch assembly, and if possible the flywheel and disc assembly separately? I've got weights for OEM and aftermarket ACT clutch. Maybe it's time to start an aftermarket clutch wiki thread.
Clutch/flywheel have already been installed, OS Giken claims a 5% overall weight reduction.
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      02-14-2014, 02:22 PM   #21
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2015 BMW M4  [2.75]
Diff bushings arrived:





Perfect match for the rapid prototypes, going in shortly.
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      02-14-2014, 02:40 PM   #22
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