$200 brake ducts for all four corners

[drroc]

I printed another set of scoops and painted them black so that they wouldn't stand out too much. I was also too lazy to modify the 3D model file, so I just used a dremel to modify the lip to make it fit the lower suspension arm. Otherwise, the installation was a breeze. I'll measure the airflow inside the duct at a later point.

[metomwhou]

looks cool....If Rodger is doing it, it must be worth the effort!

[nicknaz]

you guys are taking this next level.

I'm going with basic mods on this end, and picked up some 7GT3 front ducts for my 6TT for $8 per piece and calling it done

[adc]

Can I persuade any of you gents with the 3D printers to print me a set of front scoops? I’d pay naturally.

[TheBreeze]

Update: Finally got to try out the 3D scoops a couple of weeks ago @ VIR, they worked really well! 6+ hours of lapping full track @ 2:12ish and came away with bright blue calipers and very little pad wear on my DS1.11s. Brakes worked flawlessly, never any fade or other brake issues. I used the scoops on the front and used round 3" inlets for the back, seemed to do the trick. I think I'll probably upgrade the rears to the 3D scoops as well as I think they will drive more air in. Thanks drroc

[.jordan]

Interesting... How did you come up with that shape? I'm wondering how much drag that would cause vs. a NACA duct.

[drroc]

Originally Posted by .jordan

Interesting... How did you come up with that shape? I'm wondering how much drag that would cause vs. a NACA duct.

There is no real good place to install a NACA duct. The shape was actually created by somebody on the M2 forum. https://www.thingiverse.com/thing:3566812

As far as as drag, It is not an issue. I was able to hit the same top speed at Laguna that I was able to hit w/o these ducts.

[drroc]

This was from Laguna last week. I even managed to boil the brake fluid when the checkered flag was waved right before the pits. I couldn't do the cool down lap, so the fluid boiled and the pedal went to floor as I was driving in the parking lot. So the ducts work, but they need moving air

I had to disable MDM mode as it was too intrusive even with NT01 tires and was adding a lot more stress to the brakes.

[TheBreeze]

Originally Posted by drroc

I had to disable MDM mode as it was too intrusive even with NT01 tires and was adding a lot more stress to the brakes.

Definitely. MDM mode on this car is like dragging a parachute around the track. It's pretty awful, way more intrusive than on the e9x M. Going "full off" on everything was completely fine. Car got a little out of shape on occasion, but it was very predictable and easy to control.

What brake fluid are you running? If it's SRF, really hard to imagine that would it boil over.

[drroc]

Originally Posted by TheBreeze

Definitely. MDM mode on this car is like dragging a parachute around the track. It's pretty awful, way more intrusive than on the e9x M. Going "full off" on everything was completely fine. Car got a little out of shape on occasion, but it was very predictable and easy to control.

What brake fluid are you running? If it's SRF, really hard to imagine that would it boil over.

I believe I had two year old Brembo fluid. I am going to change it to SRF this weekend. I'll also install braided brake lines.

[FrankMstein]

Originally Posted by drroc

So I was curious about the performance of the 3D printed duct vs the previous setup that I used. I bought a Pyle anemometer to measure the airflow in mph inside the duct. I was curious to see how the airspeed in the duct corresponded to the vehicle speed.

With the 3D printed duct, the airspeed inside the duct is roughly 1/2 of travel speed. It gets somewhat faster as the vehicle travels faster as well. The max speed I hit was 48.6 mph ...

drroc So the 3D printed is 2x+ more speed?

[pilotedecourse]

FWIW I bought these and have had decent results so far. The full kit scavenges radiator air from behind the bumper and directs it to the center of the rotor. I have used it on track and it seems to work fine (better than nothing) - no data showing the delta between brake temps unfortunately. Fits behind my 18x10" track wheels/stock 666m fine when not in use on the track. Listed online price includes European VAT so the actual price for US purchasers is ~25% less than list.

If you want a more direct airflow, you can buy the dust shield replacement separately and hook up your own hose and inlet below the car. That component alone is a well-made piece of kit and does a good job directing airflow to the rotor hat so it would be a good starting point for a bespoke brake cooling kit on the front.

https://www.speedengineering.de/prod...2-komplettset/

[drroc]

Originally Posted by pilotedecourse

FWIW I bought these and have had decent results so far. The full kit scavenges radiator air from behind the bumper and directs it to the center of the rotor. I have used it on track and it seems to work fine (better than nothing) - no data showing the delta between brake temps unfortunately. Fits behind my 18x10" track wheels/stock 666m fine when not in use on the track. Listed online price includes European VAT so the actual price for US purchasers is ~25% less than list.

If you want a more direct airflow, you can buy the dust shield replacement separately and hook up your own hose and inlet below the car. That component alone is a well-made piece of kit and does a good job directing airflow to the rotor hat so it would be a good starting point for a bespoke brake cooling kit on the front.

https://www.speedengineering.de/prod...2-komplettset/

Is it attached to the wheel well behind the side radiators?

[vrptstyly]

Originally Posted by drroc

Is it attached to the wheel well behind the side radiators?

Correct. I picked up the same kit cheap on eBay new in box. I like the design of their backing plate.

Easy enough to route the plumbing under the car if necessary for fresher air. I’ve been told the fitment is great. Could be a problem for ppl running big wheel/tire combos.

I may do some simple testing with thermocouples, to measure the delta for/aft of the coolers at each corner.

[uncle ben]

Looking forward to seeing how that speed engineering kit works out.

[adc]

Originally Posted by vrptstyly

Correct. I picked up the same kit cheap on eBay new in box. I like the design of their backing plate.

Easy enough to route the plumbing under the car if necessary for fresher air. I’ve been told the fitment is great. Could be a problem for ppl running big wheel/tire combos.

I may do some simple testing with thermocouples, to measure the delta for/aft of the coolers at each corner.

Use temp adhesive strips on the calipers, or a dab of temp sensitive paint in an inconspicuous location, easier than thermocouples.

[pilotedecourse]

Originally Posted by vrptstyly

Correct. I picked up the same kit cheap on eBay new in box. I like the design of their backing plate.

Easy enough to route the plumbing under the car if necessary for fresher air. I’ve been told the fitment is great. Could be a problem for ppl running big wheel/tire combos.

I may do some simple testing with thermocouples, to measure the delta for/aft of the coolers at each corner.

Yep the intakes screw into the plastic behind the radiator (but do not cover the radiator airflow entirely). The backing plate replaces the stock dust shield and is a direct fit. I was impressed with h

I ran these on track with the stock iron brakes, rbf 600, girodisc ti shims, PFC 08 pads and 200TW tires in a 20 minute session with ambient temps in the high 50s/low60s. When I got out of the car and used a digital thermometer the calipers read 340F front and 325F rear. I unfortunately don’t have stock numbers in similar conditions (I’m an intermediate HPDE driver on the faster side of my run group) but would love if someone could post numbers with stock or other brake cooling setups for comparison. I feel like the setup is doing *something*. I have a hard time believing that no positive air pressure is making it to the center of the hat at track speeds so it’s a value add in my book given that I dont track enough to justify a full bbk setup. I will add girodiscs when my stock rotors are done and that will further enhance airflow. Importantly I did not notice any change in operating temps which was my biggest concern with this kit.

[uncle ben]

The kit also seems to be 99% reversible if you decide to not use it anymore. Maybe a few screw holes in the inner fender liner.

[drroc]

Originally Posted by pilotedecourse

Yep the intakes screw into the plastic behind the radiator (but do not cover the radiator airflow entirely). The backing plate replaces the stock dust shield and is a direct fit. I was impressed with h

I ran these on track with the stock iron brakes, rbf 600, girodisc ti shims, PFC 08 pads and 200TW tires in a 20 minute session with ambient temps in the high 50s/low60s. When I got out of the car and used a digital thermometer the calipers read 340F front and 325F rear. I unfortunately don’t have stock numbers in similar conditions (I’m an intermediate HPDE driver on the faster side of my run group) but would love if someone could post numbers with stock or other brake cooling setups for comparison. I feel like the setup is doing *something*. I have a hard time believing that no positive air pressure is making it to the center of the hat at track speeds so it’s a value add in my book given that I dont track enough to justify a full bbk setup. I will add girodiscs when my stock rotors are done and that will further enhance airflow. Importantly I did not notice any change in operating temps which was my biggest concern with this kit.

You can actually stick a wind meter inside the hose and see what wind speeds you are getting. I have a post about this in this thread.

[pilotedecourse]

Originally Posted by drroc

You can actually stick a wind meter inside the hose and see what wind speeds you are getting. I have a post about this in this thread.

That's pretty darn cool. If I can get my hands on a remote anemometer for cheap I may just do that and post the results.