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      06-07-2020, 02:48 PM   #1
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MCast - GT4 Race Conversion

Over the years the Coupe has went through a number of changes and I after selling the Spec e46 I have decided to convert Coupe to a full race spec GT.I finally was able to source the right kit from Germany for the look and purpose I needed. Most of the parts are in and its time to get the ball moving.

This weekend I spent most of my time getting the car torn down to the shell, over the next few weeks we will be getting the suspension installed so we can get it rolling and over to the fabricators to complete the cage.

This should be fun,
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      06-07-2020, 03:20 PM   #2
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Current Specs for suspension.

Special thanks to all the guys at AKG Motorsport, Bimmerworld, Achilles, MCS, Blue Maxx and Syncro Designs in helping put together a great suspension package for the car.

We are starting with the following, if you are curious to the detail setups please feel free to DM me.

MCS 3 way dampers with front and rear coil-overs.
AKG has provided its DTM fully adjustable front control arms.
AKG solid trans & motor mounts, Rear Sub-frame, differential bushings.
AKG Adjustable Rear Lower Control Arms.
Achilles Motorsports Bump Steer Correction Kit
PMC Adjustable Rear Upper Control Arms.
Ground Control Med Race prepared Sway bars
Ground Control Race Camber Plates.
Bimmerworld spherical trailing arm bushings, upper, lower inner and outer.

BlueMaxx, will be completing the cage and chassis reinforcement

This is not suspension but it will be going in on this install.
Syncro Designs Race Prepped Differential 4.10 Gears with a 4 clutch 30/65 ramp, REM polished Bearings and REM polished Ring & Pinion.

Current Brake system is Stoptech Trophy Series with 380MM front and 355MM in the rear.
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Last edited by M-Cast; 06-08-2020 at 03:31 PM..
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      06-08-2020, 02:49 PM   #3
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Will eagerly follow this thread, thanks for sharing!

Question, what is the silver looking plate where the rear bulkhead used to be?

I'm really wanting to remove the rear bulkhead on my car for weight and also because I would love that open to the cockpit look. As both a street and HPDE car, i would lose the upper seat belt mounting points, correct?
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      06-08-2020, 03:29 PM   #4
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Originally Posted by SLC801 View Post
Will eagerly follow this thread, thanks for sharing!

Question, what is the silver looking plate where the rear bulkhead used to be?

I'm really wanting to remove the rear bulkhead on my car for weight and also because I would love that open to the cockpit look. As both a street and HPDE car, i would lose the upper seat belt mounting points, correct?
When we installed the half cage the guys cut out the bulk head as it has about 40 spot welds holding it in so they made a tin cover to allow for the wiring. The weight trade off for the cage vs bulkhead is not that much different. If you are going to use for both the street and track, I would weld in a few plates to the back and then add eye bolts into the back wall and keeps it clean.

I did have mounts for the standard seat belts, but the reality is a half cage is only practical if you are doing HPDE's or time trials.

As much as I love my car it is obnoxious on the street, and after selling my Spec e46 I decided to go all on the coupe.
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      06-08-2020, 05:51 PM   #5
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This is looking superb, can't wait to see how it evolves.
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      06-08-2020, 07:07 PM   #6
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THIS.IS.INCREDIBLE.
We can't wait to follow this most incredible build....TMI will not be lost on us....nor pics!
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      06-08-2020, 07:21 PM   #7
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Quote:
Originally Posted by M-Cast View Post
Quote:
Originally Posted by SLC801 View Post
Will eagerly follow this thread, thanks for sharing!

Question, what is the silver looking plate where the rear bulkhead used to be?

I'm really wanting to remove the rear bulkhead on my car for weight and also because I would love that open to the cockpit look. As both a street and HPDE car, i would lose the upper seat belt mounting points, correct?
When we installed the half cage the guys cut out the bulk head as it has about 40 spot welds holding it in so they made a tin cover to allow for the wiring. The weight trade off for the cage vs bulkhead is not that much different. If you are going to use for both the street and track, I would weld in a few plates to the back and then add eye bolts into the back wall and keeps it clean.

I did have mounts for the standard seat belts, but the reality is a half cage is only practical if you are doing HPDE's or time trials.

As much as I love my car it is obnoxious on the street, and after selling my Spec e46 I decided to go all on the coupe.
Thanks exactly what I thought. I would do tabs to keep stock belts and even do upholstery in the back to keep it clean.

HPDE is all that I'm thinking at this point.

Thanks for the notes.
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      06-09-2020, 09:05 AM   #8
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Very cool! Are you going with the Goke body kit? I recently emailed them to ask some questions about the front bumper and rear wing set up.
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      06-09-2020, 11:09 AM   #9
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Quote:
Originally Posted by F360C View Post
Very cool! Are you going with the Goke body kit? I recently emailed them to ask some questions about the front bumper and rear wing set up.
Yeah I already ordered the Carbon Fiber FIA GT4 front bumper, front fenders, rear fenders and doors. Once I get it here and installed I am thinking about getting about 5 kits made and shipped in a container.

My full kit I will have includes:
  • Varis Carbon Hood
  • Varis Carbon Rear Diffuser
  • Geoff Steel Carob Roof
  • Goke Carbon Doors
  • Goke FIA GT4 Carbon Front bumper
  • Goke FIA GT4 Carbon Front fenders
  • Goke FIA GT4 Carbon Rear fenders
  • BMW Factory areo rocker panels

The nice part about this kit is that the front and rear fenders are only 5mm wider than the stock and allow you to retain the rear bumper. The GTR kit was produced for a different chassis, which is why you see such a huge gap in the fender-wells when people put in on the standard chassis.
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      06-09-2020, 11:25 AM   #10
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Quote:
Originally Posted by M-Cast View Post
Yeah I already ordered the Carbon Fiber FIA GT4 front bumper, front fenders, rear fenders and doors. Once I get it here and installed I am thinking about getting about 5 kits made and shipped in a container.

My full kit I will have includes:
  • Varis Carbon Hood
  • Varis Carbon Rear Diffuser
  • Geoff Steel Carob Roof
  • Goke Carbon Doors
  • Goke FIA GT4 Carbon Front bumper
  • Goke FIA GT4 Carbon Front fenders
  • Goke FIA GT4 Carbon Rear fenders
  • BMW Factory areo rocker panels

The nice part about this kit is that the front and rear fenders are only 5mm wider than the stock and allow you to retain the rear bumper. The GTR kit was produced for a different chassis, which is why you see such a huge gap in the fender-wells when people put in on the standard chassis.

Keep me in the loop as I could be interested in the front/rear fenders and front bumper. Do you know if there is a weight savings with the parts? I am mainly interested in the fenders since their 5mm wider but some weight savings would be a nice bonus.

Also do you happen to know if their rear wing can be used with the factory trunk? I asked Jan Goke but have yet to get an email back.
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      06-09-2020, 11:33 AM   #11
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Quote:
Originally Posted by F360C View Post
Keep me in the loop as I could be interested in the front/rear fenders and front bumper. Do you know if there is a weight savings with the parts? I am mainly interested in the fenders since their 5mm wider but some weight savings would be a nice bonus.

Also do you happen to know if their rear wing can be used with the factory trunk? I asked Jan Goke but have yet to get an email back.
I would guess that the weight savings will be nominal due to the front bumper includes the splitter, comparable to having for example an APR front splitter you will see about 15 lbs off the front the fenders should be about 2 to 4 lbs lighter and the rear maybe a couple of pounds. The doors and rear hatch is where you could really get the weight savings, but I would not swap those out unless you were going full cage.

The real benefit as you said was getting that 5mm fender extension as it maintains a clean look and gives you enough to fit a 285 width tire easily. I am planning on putting up a site with all the available mods in stages for purpose built cars.
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      06-10-2020, 05:01 PM   #12
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Sister Car secured

Interesting day as I was able to finally secure the sister car chassis from TCKline for the second build. This will probably be built for endurance racing.
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      06-10-2020, 08:54 PM   #13
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Quote:
Originally Posted by M-Cast View Post
Interesting day as I was able to finally secure the sister car chassis from TCKline for the second build. This will probably be built for endurance racing.
Very cool! I also used to love the TC kline carbon coupe back in the day
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      06-11-2020, 03:40 AM   #14
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Quote:
Originally Posted by M-Cast View Post

The nice part about this kit is that the front and rear fenders are only 5mm wider than the stock and allow you to retain the rear bumper. The GTR kit was produced for a different chassis, which is why you see such a huge gap in the fender-wells when people put in on the standard chassis.
Nice build up. and nice parts list too.

the part about the GTR kit is produced for a different chassis, however is incorrect. its the same e86 chassis. however the rear diff is solidly mounted to the rear frame, not using a diff hanger like on your stock e86/e85. There are some modifications on the wheel housing too, but its the exact same chassis.

And the rear fender wells gap is on purpose, it allows you to run proper race slicks, with a proper side wall.

anyhows, great buildup, looking forwards on seeing the progress.

More race Z4's is more info available, so def looking forwards to how you proceed. Also wondering what class your building for and what the limitations are? Are you building a cage? or just the rollbar?

wow, so your building 2 coupes now? thats awesome!! just remember, its probably cheaper to buy a fully race prepped car (like the one in the for sale section or the Petrona's Coupe over in Europe and shipping it, then piecing these things together.

Any hows, love what your doing and where your going with this


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      06-11-2020, 06:03 AM   #15
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Quote:
Originally Posted by Vanne View Post
Quote:
Originally Posted by M-Cast View Post

The nice part about this kit is that the front and rear fenders are only 5mm wider than the stock and allow you to retain the rear bumper. The GTR kit was produced for a different chassis, which is why you see such a huge gap in the fender-wells when people put in on the standard chassis.
Nice build up. and nice parts list too.

the part about the GTR kit is produced for a different chassis, however is incorrect. its the same e86 chassis. however the rear diff is solidly mounted to the rear frame, not using a diff hanger like on your stock e86/e85. There are some modifications on the wheel housing too, but its the exact same chassis.

And the rear fender wells gap is on purpose, it allows you to run proper race slicks, with a proper side wall.

anyhows, great buildup, looking forwards on seeing the progress.

More race Z4's is more info available, so def looking forwards to how you proceed. Also wondering what class your building for and what the limitations are? Are you building a cage? or just the rollbar?

wow, so your building 2 coupes now? thats awesome!! just remember, its probably cheaper to buy a fully race prepped car (like the one in the for sale section or the Petrona's Coupe over in Europe and shipping it, then piecing these things together.

Any hows, love what your doing and where your going with this


Thanks Vann, we have purchased a few of these retired cars before. The problem is replacement parts can be crazy expensive and some time impossible to find. One example is we had a an e36 touring car that broke an axle. Took over a year and cost over 10k to replace. That was just one of the issues we ran into. I am lucky enough to live in an area with lots of contacts in the industry to help.

Since I am planning on racing both cars, I like to know what I am getting into, not to mention I enjoy the creative process. 😉
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      06-11-2020, 02:08 PM   #16
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Quote:
Originally Posted by M-Cast View Post
Interesting day as I was able to finally secure the sister car chassis from TCKline for the second build. This will probably be built for endurance racing.
That is an AWESOME picture.
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      06-18-2020, 01:56 PM   #17
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And Then There were Three

Things are going to get interesting. After securing the second chassis from TC Kline, I got a call on any interest in taking another local car. A 3.0si with a M Sport package including the M front bumper and hood which I sold to the previous owner.

This car will move into the second position and be a dedicated for endurance racer for WRL and AER. The tear down will commence once the C-Mod car reassembly is complete.


Should have more pics next week once we get back from picking up the other chassis three together next week.
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      06-18-2020, 02:10 PM   #18
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Quote:
Originally Posted by M-Cast View Post
Things are going to get interesting. After securing the second chassis from TC Kline, I got a call on any interest in taking another local car. A 3.0si with a M Sport package including the M front bumper and hood which I sold to the previous owner.
If that 3.0si is MT I would have been all-in as well. Hoarding all these special cars now are you!? Excited to see the progress
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      06-27-2020, 06:44 PM   #19
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I started on the suspension today. MCS 3ways, AKG DTM control arms, Achilles bump stops, and Ground Control sway bars.
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      06-27-2020, 08:00 PM   #20
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Amazing - hoping I can get over the border and we run into each other - would love to see this beast in person.
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      06-28-2020, 10:19 PM   #21
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Awesome!!! Nice parts excellent progress
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      06-29-2020, 07:33 PM   #22
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Quote:
Originally Posted by M-Cast View Post
I started on the suspension today. MCS 3ways, AKG DTM control arms, Achilles bump stops, and Ground Control sway bars.
Very cool! I am just deliberating about buying the MCS 2way set up... how did you route and mount the rear remote canisters?
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