[Westersund]

BIMMERPOST / Classifieds

Asking Price:

USD 300.00

Item Interest

I've been hanging out here on Bimmerpost a long time but I don't own a G8X M car, however recently I've developed the Westersund Motorsport front Clubsport kit and front Race kit for the G8X M platform that you might find a good option for your trackday driving, similar to what I did for the F8X M platform. A rear kit will be coming shortly.

I've been doing these kits for BMWs for many years now as a hobby and here's a few URLs to similar kits for reference:

All the parts I've done for the F8X M platform - https://f87.bimmerpost.com/forums/sh....php?t=2124906

The Z4 M kits - https://www.zpost.com/forums/showthread.php?t=1634387

The original thread over at Rejsa.se which is a Swedish trackday/race forum - https://rejsa.nu/forum/viewtopic.php?t=112776

I haven't completed and test fitted a kit yet (but I'm confident it will fit) so consider this thread as a heads up of what's coming shortly.

***Pricelist***
Front Clubsport kit - 300$
Front Race kit - 500$
Rear Clubsport kit - 250$
Bundle discount (front Clubsport/Race + rear Clubsport kit) - -50$

***Shipping***
I'll have to weigh the kits before I can give a final number but I'm estimating the kits will be of similar weight as the F8X M platform (Pricing for shipping to the US and Canada). Trackable shipping!

Front kit (up to 2 kg) - 22$
Rear kit (up to 1 kg) - 16$


The G8X M front Clubsport kit is a simpler entry level brake cooling kit for the beginner to intermediate trackday driver. The kit itself consist of a backing plate with a scoop that directs the air that is channeled from the the front bumper into the wheel well straight to the center of the brake disc. The backing plate is contour cut the sit tight against the knuckle/upright to prevent air from slipping past.





I've designed the scoop to clear the thrust arm even at full droop and full steering angle, you can see the cut out in the bottom right corner of the scoop. Hopefully no one will ever be in that situation!


Here's a view from above with a wheel and tire combo mounted equivalent to a 18x10" ET 20 wheel with a 275 wide tire, basically a little wider than a stock wheel and tire combo.


Here you can see the straight shot from the front bumper air channel to the scoop. Keep in mind this is with the wheels straight ahead but at full droop, so at ride height it will be even more centered!



The G8X M front Race kit is a more comprehensive brake cooling kit for the advanced, or aspiring to be, trackday driver. It's a further developement of the Clubsport kit (can be upgraded retroactively) that comes with additional lower control arm ducts that are unique and side specific for the G8X M platform along with active cooling for the brake calipers but also additional cooling for the brake discs. Sway bar end link hose holders from the F8X M Race kit will be included as well, I believe both end links have a diameter of 10 mm.

The orange backing plate is the addition in the Race kit, as you can see it's a direct fit to the Clubsport backing plate and it sits tight to the knuckle/upright as well.


As mentioned the control arm ducts are unique and side specific to the G8X M platform as they are contour cut to sit firmly in place and to make installation easier.




The duct that cools the caliper and brake disc is split in half internally to distribute the air 50/50. Half of the air is let out in the center of the disc and the other half is let out inbetween the 3 inner pistons of the caliper to even out the cooling effect.




The caliper duct has a built in arm that acts as a support against the damper body to prevent the duct from moving/causing it to hit the caliper or the backing plate from hitting the disc. The arm is secured around the damper with zip ties.


Here you can better see that the backing plates are contour cut to sit tightly against the knuckle/upright to prevent the air from passing by and effectively reducing the cooling effect.


A better picture to see how the air is split between the caliper and the center of the disc.




As I showed in the Clubsport presentation you can see that the air flow from the front bumper air channel hit the backing plate scoop with a straight shot, keep in mind this picture shows the car with straight wheels and at full droop. At ride height the air flow will be even more centered.




A view from above to see how much the scoop protrudes outside the inside of the wheel. The wheel/tire combo in the pictures is equivalent to a 18x10" ET 20 with a 275 tire.


Here you can see the cut out in the scoop to make it clear the thrust arm at full droop and full steering angle.

[Westersund]

The design for the rear brake cooling is now done, the air intake from the F8X M rear brake cooling could be carried over as the lower control arms are "identical". Had to do a new hose holder for the toe arm because of the wire holder mounted on the damper on the G8X M platform. The 3D-scan was a little sloppy but the most important parts are there.

The concept is the same as for the F8X M platform with the sole difference that there's actually a gap between the backing plate and knuckle which lets air into the center of the brake disc. The reason being that the G8X M uses a floating brake caliper with integrated parking brake instead of the traditional BMW parking brake with intergrated friction ring in the brake disc hub along with brake shoes. This means that the G8X M rear brake disc has slots which allows air to pass from the center of the disc out into the cooling vanes in the brake disc.




Just like the F8X M kit the backing plate duct shares the bolt for the ABS-sensor and the toe arm, longer bolts for the ABS-sensors will be included along with wide washers and low nuts for the toe arm bolt.


Here you can see the opening between the knuckle and backing plate (red circle).


The exit of the duct is pointing straight to the center of the brake disc which means it will cool the wheel bearings as well.


A few pictures of the CAD drawings with contours on.






To make it easier to understand, thanks to my sloppy 3D-scan, I wanted to include some actual pictures on a rear knuckle so you can see where the air is guided to (green circle).


No cutting is required! But if you want to increase the air flow a bit more you can cut the backing plate a little (dashed red line).

[Westersund]

I have designed new ducts specially made for the Fall Line F8X/G8X M billet lower control arms for those of you that run a coilover instead of a divorced damper/spring setup like OEM. I've also made a bracket to mount the headlight level sensor to the control arm.

[sirwestofash]

Are these made out of a polymer material, a metal, or some abs plastic ?


Do these work with CCB kit?

[Westersund]

Originally Posted by sirwestofash

Are these made out of a polymer material, a metal, or some abs plastic ?


Do these work with CCB kit?

The ducts for the backing plates are made out of polycarbonate and the control arm duct and hose holders are made out of PETG. What’s the dimensions of the CCB kit? I think the Clubsport kit will work without a problem but I’m not sure if the caliper duct will work though. I’m sure we could find a solution. Send me a PM if you’d like to discuss the details.

[Westersund]

Originally Posted by sirwestofash

Are these made out of a polymer material, a metal, or some abs plastic ?


Do these work with CCB kit?

https://g80.bimmerpost.com/forums/sh....php?t=2049237

According to the thread above the regular steel brake calipers and the CCB calipers are the same with the only difference that the mounting points are 10 mm taller on the CCB's. This means even then caliper cooling duct will work.

[sirwestofash]

Originally Posted by Westersund

https://g80.bimmerpost.com/forums/sh....php?t=2049237

According to the thread above the regular steel brake calipers and the CCB calipers are the same with the only difference that the mounting points are 10 mm taller on the CCB's. This means even then caliper cooling duct will work.

This is good to know!! Thank you for looking into it. I've always heard CCB are more temperature resilient and slower to warm up. Would something like this potentially have detrimental effects in daily driving for a g80 with CCB? What's the ideal operating temperature for the normal oem pads and CCB pads?

[Westersund]

Originally Posted by sirwestofash

This is good to know!! Thank you for looking into it. I've always heard CCB are more temperature resilient and slower to warm up. Would something like this potentially have detrimental effects in daily driving for a g80 with CCB? What's the ideal operating temperature for the normal oem pads and CCB pads?

I'm afraid I can't tell you for certain what kind of temperatures the stock BMW CCB's for the G-series want ideally, what I do know is that CCB's on road cars these days aren't as finicky when it comes to "cold" temperatures. They have more cold bite than real race CCB's or the first generation that was introduced on road cars.

From experience is call tell you that my friend ran one of my kits on his F82 M4 CS with CCB's both on track and as a daily during the summer, he didn't have any problems with cold brake bite.