Road Racing / Autocross & Time Attack Road Racing / AUTOX, HPDE, Time Attack

Hood Aero

 
Old 05-13-2010, 04:32 PM
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Default Re: Hood Aero

I'm having my sheet metal guy make one for my car in the next week or two. I'll see about posting pics. My one questions is how are you attaching the duct to the radiator support?
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Old 05-13-2010, 11:39 PM
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Default Re: Hood Aero

This is the only picture i can find.

The factory bumper reinforcement can be used but the center part that holds the hood latch had to be cutout. The center opening of the front bumper sides into the duct and the duct is held between the radiator and radiator support, no hardware was needed.

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Old 05-14-2010, 05:43 AM
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Default Re: Hood Aero

nice setup. do you have any shots of over the bay? or is it even ducted out of the rad? i dont remember it to be..because this car was in honda tuning like 3 years ago correct?
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Old 05-16-2010, 11:50 AM
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Default Re: Hood Aero

Originally Posted by fd380ps View Post
This is the only picture i can find.

The factory bumper reinforcement can be used but the center part that holds the hood latch had to be cutout. The center opening of the front bumper sides into the duct and the duct is held between the radiator and radiator support, no hardware was needed.
Is cutting anything off the radiator support legal in any class other than H1? I thought there was a discusion a year or so a go about modifing the radiator support ro angle the radiator by a few degrees for added front downforce and it was poo pooed for H2-H5. Thanx for the pic it helps alot!!!
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Old 05-16-2010, 11:58 AM
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Default Re: Hood Aero

Mike, I think that was found illegal specifically because of the radiator placement, not the actual cutting. If I remember right, the radiator has to remain in its stock location, and that was the limiting factor.
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Old 05-16-2010, 12:38 PM
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Default Re: Hood Aero

Thanx Adam, I took some time and looked at the rules again and I can not find a rule that says cutting the radiator support is ok'd so I may post a thread on NASAforums and get something official.
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Old 05-31-2010, 07:44 PM
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Default Re: Hood Aero

back from 3 pages dead....... what about something like this a la those afraid to go right?





obviously more to release underhood pressure, but I feel it's gotta have some effect on cooling as well, or could at least be made to.
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Old 05-31-2010, 08:25 PM
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Default Re: Hood Aero

Erik, those just open under pressure while moving I guess?
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Old 05-31-2010, 08:29 PM
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Originally Posted by Stinkycheezmonky View Post
Erik, those just open under pressure while moving I guess?
yep. Just a simple hinge. no springs or anything.
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Old 05-31-2010, 08:34 PM
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Default Re: Hood Aero

Those flaps are actually there for when the car is backwards to keep it from going airborn. They stay closed during normal race conditions if I remember correctly.

The other change increases the size of the cowl flaps - two flaps, hinged at the front so the wind will keep them closed when the truck is moving forward - from 2 inches by 10 inches to 4 inches by 15 inches. When a truck breaks loose and is going backwards, the flaps open and keep air pressure from building under the truck, which could have played a role in the trucks lifting off the ground at Daytona.
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Old 05-31-2010, 08:46 PM
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Default Re: Hood Aero

Originally Posted by Kay2 View Post
Those flaps are actually there for when the car is backwards to keep it from going airborn. They stay closed during normal race conditions if I remember correctly.
the roof ones are, but these looked more like pressure release from the huge canopy of the hood/fenders/bumper. All the air/airpressure through the radiator has nowhere to go otherwise. I could be mistaken though.
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Old 06-01-2010, 04:58 PM
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Default Re: Hood Aero

That quote is referring to those flaps there. The ones on the roof have stayed the same size for years.
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Old 12-12-2013, 05:24 AM
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Default Re: Hood Aero

anyone have updated status on their aero hood mods ?
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Old 12-12-2013, 11:48 AM
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Default Re: Hood Aero

I haven't taken it out on track, but fuel economy wasn't affected and it took an extra 1.75-2 miles of driving before it got up to temp compared to the stock hood (which is back on now).

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Old 12-12-2013, 12:00 PM
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wtf... lol
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Old 12-12-2013, 05:24 PM
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Default Re: Hood Aero

SPEEDHOLES!! :HOMER:
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Old 12-13-2013, 07:26 AM
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Default Re: Hood Aero

I am using a J's Racing hood. I have a half core radiator and 11x11 oil cooler filling the other half. Without any additional ducting I noticed an immediate drop in oil temp (6-8 degrees after a 20 minute session) I have been considering building a duct for the front bumper to direct air through the coolers and out the hood.
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Old 12-20-2013, 07:27 AM
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Default Re: Hood Aero

Whatever you do, avoid the "reversed Subaru scoop" as the bottom of the windshield is the second highest pressure zone on a car (after the front bumper of course). High pressure is shown in red.


Doing this may actually force air back into your engine bay from this zone of high pressure, or at the very least it will be much less efficient than a conventional extractor at creating the cooling that you are after. Hope this helps when you are designing your DIY hoodvents! Cheers!

Last edited by k20miata; 12-20-2013 at 07:30 AM. Reason: Pictures did not work properly
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Old 12-20-2013, 01:57 PM
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Default Re: Hood Aero

mine is done and will debut in april
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Old 12-20-2013, 04:20 PM
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Default Re: Hood Aero

Has anybody used one of these vents with success? seems like a popular choice in the drifter world...




http://www.ebay.com/itm/141053113541...84.m1423.l2649

I'm trying to decide what i would like to do with my track car, i have a few DC2 metal hoods to play with and this beat up CF which is extremely ugly, but might be workable and can't quite decide what i want to do.

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Old 12-20-2013, 05:03 PM
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Default Re: Hood Aero

good for heat extraction. not sure it makes substantial downforce
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Old 12-20-2013, 05:24 PM
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Yeah, not really going for downforce, going more for good heat extraction, then again, im planning on getting my Narrow B header coated by swaintech so maybe it wont be so bad next year anyway.
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