Brake ducts for c4 - CorvetteForum - Chevrolet Corvette Forum Discussion



Autocrossing & Roadracing
Suspension Setup for Track Corvettes, Camber/Caster Adjustments, R-Compound Tires, Race Slicks, Tips on Driving Technique, Events, Results
Sponsored by:
Sponsored by:

Brake ducts for c4

Reply
 
 
 
Thread Tools Search this Thread
Old 03-08-2006, 10:50 PM   #1
mrc24x
CF Senior Member
Thread Starter
 
mrc24x's Avatar
 
Member Since: Aug 2005
Location: '88 TPI L98/HotCam Powell, Ohio
Posts: 1,171
Thanked 5 Times in 5 Posts
Default Brake ducts for c4

I'm getting ready to install some cooling ducts for my C4 and need opinions/recommendations?? I am thinking about putting NACA duct inlets where the headlights would normally be instead of inlets mounted in the lower spoiler. Is there sufficient airflow if I go this route or am I wasting my time?? Thanks in advance!!
mrc24x is offline   Reply With Quote
Old 03-09-2006, 08:26 AM   #2
jwt1603
CF Senior Member
Support Corvetteforum!
 
jwt1603's Avatar
 
Member Since: Mar 2005
Location: Northeast FL
Posts: 1,711
Thanked 7 Times in 7 Posts
Default

I wouldn't think you would get enough air forced in there due to the slope of the hood. I have (somewhere) old pics of a wind tunnel test on a C4 and the fogstream from the wand goes right up and over the hood.

My two cents of course.
jwt1603 is offline   Reply With Quote
Old 03-09-2006, 08:51 AM   #3
Vetracr
CF Senior Member
 
Vetracr's Avatar
 
Member Since: Apr 2005
Location: Cooper City FL
Posts: 589
Thanks: 0
Thanked 0 Times in 0 Posts
Default Cooling ducts

The best place for a C4 brake inlet duct is under the bumper just outboard of the rub strips. This is a high pressure zone. GM engineers found this to be the best spot from testing during the Corvette Challenge series. On my C4 race car I installed NACA inlet ducts under the front bumper just in front of the spoiler. I ran these 3" ducts to the center of the rotor. I also installed inlet ducts on the front spoiler and ran these to the back of the caliper. Not brake related but I ran a cooling duct from the turn signal opening to the alternator, a Corvette weakpoint. FWIW.

Larry
Vetracr is offline   Reply With Quote
Old 03-09-2006, 08:57 AM   #4
ZR1 MK
CF Senior Member
 
ZR1 MK's Avatar
 
Member Since: Dec 2002
Location: ZR1 NY
Posts: 2,048
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Put them in the air deflector/spoiler.
ZR1 MK is offline   Reply With Quote
Old 03-09-2006, 09:18 AM   #5
astock165
CF Senior Member
 
astock165's Avatar
 
Member Since: Sep 2004
Location: Manchester NH
Posts: 1,181
Thanks: 0
Thanked 1 Time in 1 Post
Default

Quote:
Originally Posted by Vetracr
The best place for a C4 brake inlet duct is under the bumper just outboard of the rub strips. This is a high pressure zone.
Is this area the one highlighted from your avatar?

astock165 is offline   Reply With Quote
Old 03-09-2006, 09:18 AM   #6
Gary04Z06
CF Senior Member
 
Gary04Z06's Avatar
 
Member Since: Oct 2000
Location: St. louis, MO
Posts: 5,667
Thanks: 0
Thanked 1 Time in 1 Post
Default

Quote:
Originally Posted by Vetracr
The best place for a C4 brake inlet duct is under the bumper just outboard of the rub strips. This is a high pressure zone. GM engineers found this to be the best spot from testing during the Corvette Challenge series. On my C4 race car I installed NACA inlet ducts under the front bumper just in front of the spoiler. I ran these 3" ducts to the center of the rotor. I also installed inlet ducts on the front spoiler and ran these to the back of the caliper. Not brake related but I ran a cooling duct from the turn signal opening to the alternator, a Corvette weakpoint. FWIW.

Larry
I picked up some NACA ducts also, I plan on putting them in front of the spoiler also. It is a high pressure zone and will give you the most air to the brakes. Just need to get some hose now.
Gary04Z06 is offline   Reply With Quote
Old 03-09-2006, 10:31 AM   #7
ZR1 MK
CF Senior Member
 
ZR1 MK's Avatar
 
Member Since: Dec 2002
Location: ZR1 NY
Posts: 2,048
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Quote:
Originally Posted by Vetracr
The best place for a C4 brake inlet duct is under the bumper just outboard of the rub strips. This is a high pressure zone. GM engineers found this to be the best spot from testing during the Corvette Challenge series. On my C4 race car I installed NACA inlet ducts under the front bumper just in front of the spoiler. I ran these 3" ducts to the center of the rotor. I also installed inlet ducts on the front spoiler and ran these to the back of the caliper. Not brake related but I ran a cooling duct from the turn signal opening to the alternator, a Corvette weakpoint. FWIW. Larry
Here is a pic of mine. Larry, how long do your
front wheel bearings last. Thats the weak point for me.
My rear bearings are still the original with 40k miles which
8k are track miles.
ZR1 MK is offline   Reply With Quote
Old 03-09-2006, 10:37 AM   #8
mrc24x
CF Senior Member
Thread Starter
 
mrc24x's Avatar
 
Member Since: Aug 2005
Location: '88 TPI L98/HotCam Powell, Ohio
Posts: 1,171
Thanked 5 Times in 5 Posts
Default

Thanks for the help everyone. The spoiler it is!!
mrc24x is offline   Reply With Quote
Old 03-09-2006, 11:54 AM   #9
96GS#007
Tech Contributor
 
96GS#007's Avatar
 
Member Since: Apr 2000
Location: Los Angeles CA
Posts: 7,698
Thanked 107 Times in 88 Posts
Default

Home Depot specials ...

Components (except Aeroduct hose):



Modified spoiler piece:


Driver's side spoiler:


Passenger side:


Underneath shot...

Last edited by 96GS#007; 03-09-2006 at 05:41 PM.
96GS#007 is offline   Reply With Quote
Old 03-09-2006, 12:17 PM   #10
Umrswimr
CF Senior Member
St. Jude Donor '05
 
Umrswimr's Avatar
 
Member Since: Apr 2001
Location: Overwhelmed as one would be, placed in my position.... DFW, TX
Posts: 36,449
Thanks: 0
Thanked 1 Time in 1 Post
Default

Quote:
Originally Posted by ZR1 MK
Here is a pic of mine. Larry, how long do your
front wheel bearings last. Thats the weak point for me.
My rear bearings are still the original with 40k miles which
8k are track miles.
Do you have any details from this installation? How did you route the hose, etc etc. This looks like the exact setup I'm looking for.
Umrswimr is offline   Reply With Quote
Old 03-09-2006, 12:51 PM   #11
ZR1 MK
CF Senior Member
 
ZR1 MK's Avatar
 
Member Since: Dec 2002
Location: ZR1 NY
Posts: 2,048
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Quote:
Originally Posted by Umrswimr
Do you have any details from this installation? How did you route the hose, etc etc. This looks like the exact setup I'm looking for.
I cut the holes and mounted 3 inch scoops as shown. I used holes without metal screens for years, but later used it to help keep debris out of the wheels. Not sure it helps much as I still get plenty of rubber accumlated in the wheels. The hose goes up along the sway bar and is held in place with plastic ties to permanently mounted small cable clamps. I will sent you any pictures I have. My current setup works fine, but I plan to modify it for the future.
ZR1 MK is offline   Reply With Quote
Old 03-09-2006, 01:26 PM   #12
ScaryFast
CF Senior Member
 
ScaryFast's Avatar
 
Member Since: Jul 2001
Location: Detroit's West Side MI
Posts: 4,862
Thanked 5 Times in 5 Posts
Default

How do you guys keep them attached? My car is very low, but from the above photos I'd say about the same as you. I had nice ducts attached in the same spot, but a lawn mowing session tore them off.


The occasional off-track is inevitable, do you replace them, or are your rivets robust enough to handle it? Did you reinforce the area? That little spoiler is only held on with some small screws.
ScaryFast is offline   Reply With Quote
Old 03-09-2006, 02:17 PM   #13
ZR1 MK
CF Senior Member
 
ZR1 MK's Avatar
 
Member Since: Dec 2002
Location: ZR1 NY
Posts: 2,048
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Quote:
Originally Posted by ScaryFast
How do you guys keep them attached? My car is very low, but from the above photos I'd say about the same as you. I had nice ducts attached in the same spot, but a lawn mowing session tore them off.
The occasional off-track is inevitable, do you replace them, or are your rivets robust enough to handle it? Did you reinforce the area? That little spoiler is only held on with some small screws.
Get the proper tools and stop cutting the grass with the Vette.
I used machined thread screws. No reinforcing, but no rivets . I went off the track once with the Vette. The right side hose came off, but the scoops where fine. The reason it came off was that I went over the curbing and I didnt tighten the hose clamp as much then as I do know. From memory, its 3.5" ground clearance at the middle of the spoiler for my car.
ZR1 MK is offline   Reply With Quote
Old 03-09-2006, 02:37 PM   #14
96GS#007
Tech Contributor
 
96GS#007's Avatar
 
Member Since: Apr 2000
Location: Los Angeles CA
Posts: 7,698
Thanked 107 Times in 88 Posts
Default

Quote:
Originally Posted by ScaryFast
How do you guys keep them attached? My car is very low, but from the above photos I'd say about the same as you. I had nice ducts attached in the same spot, but a lawn mowing session tore them off.

The occasional off-track is inevitable, do you replace them, or are your rivets robust enough to handle it? Did you reinforce the area? That little spoiler is only held on with some small screws.
My ducting is held in place underneath the front fascia using zip ties. The rivets have always done the job of holding the adapter to the spoiler and the ducting to the adapter. When mowing the grass, the zip ties allow the ducting to slide fore & aft as the spoiler flexes. FWIW, the adapter and the ducting are gutter parts and cost me $3 total (like I said, Home Depot special! ) so if I destroy it, it's not a big deal. In addition, the zip ties will fail before there's any damage to the fascia.

The Aeroduct high-temp hose is routed from the duct back to the swaybar, then between the lower a-arm and the ps rack, behind the backside of the shock absorber, and then to the center of the brake rotor. The routing sounds crazy but it't actually straight forward when you see it in person. It's held in place with zip ties. I wrap the Aeroduct hose with duct tape and as the tape wears due to steering action, I simply put more tape on there (about every 3 weekends). I've been using the current Aeroduct hoses for ~3 years.
96GS#007 is offline   Reply With Quote
Old 03-09-2006, 03:08 PM   #15
ScaryFast
CF Senior Member
 
ScaryFast's Avatar
 
Member Since: Jul 2001
Location: Detroit's West Side MI
Posts: 4,862
Thanked 5 Times in 5 Posts
Default

The hoses were fine, I tore off the spoiler and the ducts mounted in it.

What did you guys use in place of the stock spoiler, which was stupid expensive to replace with a GM part?
ScaryFast is offline   Reply With Quote
Old 03-09-2006, 03:49 PM   #16
johnno!
CF Senior Member
 
johnno!'s Avatar
 
Member Since: Dec 2002
Location: Utica NY
Posts: 498
Thanked 0 Times in 0 Posts
Default

I'd love to see any pics that you guys may have, if you email them to me, I'll post them for everyone to see -- jbackman at destinycorvetteclub.com
johnno! is offline   Reply With Quote
Old 03-09-2006, 05:42 PM   #17
96GS#007
Tech Contributor
 
96GS#007's Avatar
 
Member Since: Apr 2000
Location: Los Angeles CA
Posts: 7,698
Thanked 107 Times in 88 Posts
Default

I added a few pics to my post above.
96GS#007 is offline   Reply With Quote
Old 03-09-2006, 09:33 PM   #18
CF6873
CF Senior Member
 
Member Since: Jul 2000
Location: Lancaster PA
Posts: 2,049
Thanks: 0
Thanked 1 Time in 1 Post
Default

I decided to go with 2 2" hoses to get less squishing going through the suspension components. They have been working fine.





CF6873 is offline   Reply With Quote
Old 03-10-2006, 09:02 AM   #19
ZR1 MK
CF Senior Member
 
ZR1 MK's Avatar
 
Member Since: Dec 2002
Location: ZR1 NY
Posts: 2,048
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Here are some pics. I will post the scoop on Monday. You can see how I ran the hose. Early on, I wrapped the hose with header type material and drove carefully in the pits not damaging the hose much. As time when on, I got lazy and damaged the hose more frequently, so I fabed the metal guards. They are made from 25 gauge steel and will colapse if the situation is warranted, although you would be in real trouble if that type of turning is reqiured on track. This season, I plan to put a mounting plate and duct tube at the rotor. Possible reroute the hose differently too.


ZR1 MK is offline   Reply With Quote
Old 03-10-2006, 11:22 AM   #20
speedjohnson
CF Senior Member
 
speedjohnson's Avatar
 
Member Since: Dec 2002
Location: salem or
Posts: 746
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Quote:
Originally Posted by Vetracr
The best place for a C4 brake inlet duct is under the bumper just outboard of the rub strips. This is a high pressure zone. GM engineers found this to be the best spot from testing during the Corvette Challenge series. On my C4 race car I installed NACA inlet ducts under the front bumper just in front of the spoiler. I ran these 3" ducts to the center of the rotor. I also installed inlet ducts on the front spoiler and ran these to the back of the caliper. Not brake related but I ran a cooling duct from the turn signal opening to the alternator, a Corvette weakpoint. FWIW.

Larry
Those pics are killer. Do the tires contact at full lock? I'm tearing up my tubes and replacing after every event... I've never seen such an "wide open" appearing space become so "small and tenuous" as the route to the C-4 brake rotor seems to be.

Last edited by speedjohnson; 03-10-2006 at 11:24 AM.
speedjohnson is offline   Reply With Quote
Go Back   CorvetteForum - Chevrolet Corvette Forum Discussion >
Reload this Page
  • Brake ducts for c4
  •  
     
    Reply

    Related Topics
    Thread Thread Starter Forum Replies Last Post
    Closing off stock brake duct inlets on a C6 naschmitz Autocrossing & Roadracing 1 06-02-2017 12:40 AM
    WTB: rear brake ducts c5z stuiephoto C5 Parts for Sale/Wanted 0 07-27-2016 06:51 PM
    Installation Question - DRM Brake Duct Inlets with Quantum Spindle Ducts skyavonee Autocrossing & Roadracing 18 12-21-2015 09:50 PM
    [Z06] Rear brake duct inlet removal DickAry C6 Corvette ZR1 & Z06 1 08-22-2012 01:18 PM
    [Z06] Brake ducts from Stock splitter AzDave47 C6 Corvette ZR1 & Z06 20 12-21-2011 03:11 PM


    Tags
    aeroduct, air, brake, c4, corvette, deflector, depot, diy, duct, ducts, forum, front, home, rotors, track

    Thread Tools Search this Thread
    Search this Thread:

    Click for Advanced Search

    Posting Rules
    You may not post new threads
    You may not post replies
    You may not post attachments
    You may not edit your posts

    BB code is On
    Smilies are On
    [IMG] code is On
    HTML code is Off
    Trackbacks are Off
    Pingbacks are Off
    Refbacks are Off

    Forum Jump


    All times are GMT -4. The time now is 12:33 PM.


     
    • Ask a Question
      Get answers from community experts
    Question Title:
    Description:
    Your question will be posted in: