New hood louver (lots o' pics)
 

So I had my local friend fab me up a hood louver right over the turbo so that (maybe) the underhood temperatures would be lower after a hard drive. Here's the final product. Don't mind the rock chips :eek5:

Attachment 212867

So far, so good. Considering I still have the bowser heatshield on (modded to fit the turbotony dp), there's a lot of heat coming out. I'm going to cut the heatshield so that the turbo can be fully exposed to the louver and see what happens.

As requested:

How she sits now
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http://img.photobucket.com/albums/v3...530081138a.jpg
Attachment 212872
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And past setups ...
Attachment 212874
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http://img.photobucket.com/albums/v3...wshooozooz.jpg

looks good, more pictures?
I like how it kinda curves around the hood

so does it work and is it pulling air out or in?

It's just a vent when it's stopped and, if my understanding is correct, it'll pull air out at speed.

Icantthink: do you want pics of the louver or the car?

i'm in love with that car's color, share?

louver first, car second.

tape some 2 inch long yarn strands to the vent and see which way the air goes. Most vents in that location suck air in at speed.

ouch

Phoy, you can borrow my magnehelic gauge and video camera whenever you want so you can test it.

Not a very accurate way to measure aerodynamics.

If so, then why do all ALMS racecars have louvers on their hoods/fenders. The louver isn't at the base of the windshield where their's a high pressure area. The louver in that location (depending on the shape -its hard to see from the pic) most likely will draw air out as the air goes over the louver creates a low pressure suction at the opening of the vents, sucking air out.

0.02

I was watching a deal on "this week in F1" where the show went to the red bull tunnel where Adrian Newey was using yarn. You should call him up and tell him that he's doing it wrong...after you kill yourself for being an armchair-------. You're about as useful as a football bat.

:bowrofl::bowrofl::bowrofl::bowrofl::bowrofl: Dammit Hustler, Like Bubba the love Sponge says, "I love you in a non ------ way" bro.
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That was simply amazing and awe inspiring.

Hustler, man, start your own thread. I keep trying to read about stuff thats on topic and you come in and post some random copy-and-paste from somewhere that doesn't mean a damn thing. We're all very proud of your weird non-sequiturs but they're pretty much in every thread at this point.

Wow... Theirs quite a bit of immaturity in miataturbo.net

I am well aware of the use of string in wind tunnels. If you havn't been living under a rock for the past 10 years, it should be considered common knowledge and not required to state it. The point being, that although string helps to show the flow of air over a surface and to make sure that the air dosn't detach from the body curvature, it does nothing to show the airflow over the body (above the surface) -which is why they use smoke in wind tunnels (again, pretty commonly-held knowledge). The point I was making was that due to the size of the louvers, string will not show a conclusive result of how the air will flow into the louver, and thus is not an appropriate test of the airflow over and out of the louver.

I work with a lot of aerodynamicists. Heck, SWIFT is less than 5 miles from my house and i've been to their wind tunnel on a few occasions.

Please stop the immature slandering and bashing and grow up.

+1 more pics of the louvers, and the car. Also, if that car is ever out in the rain.. cutting the heatshield to expose the turbine might not be a great idea. Looks good btw.

oh wah wah wah. Look at the string, is air going in or out? You can try to complicate it to tell me I'm wrong, or you can look at the string. Its that simple. If it turns around backwards, its not working the way you want it to. You don't need smoke for that.

Yes, I'm immature.

my reply was relatively on-topic.

it's pretty much all he has at this point....

And apparently ignorant as well.

If you read my post, it stated the difference between why smoke and string is used. Which stated that smoke is used to show the path of airflow above the surface of the body -which means that smoke would not show the airflow into the vent.

One way smoke might work to show airflow out of the vent is for it to go in the radiator (and if it didnt dissipate) the high pressure under the hood and low pressure from behind the vent would result in smoke venting from the louver.

Again, i'm not recommending to test with smoke as it is completely unnecessary (since I must state the obvious), my point was, that by the looks of the louver, I would doubt that even if you put the string at the trailing edge of the top of the louver, it would just flap in the wind - not sucking into the vent, nor concluding that air is escaping the vent. For this purpose, I can't imagine a way to attach the string in a way that it will conclude if the louver is working or not as I do not see the string sucking into the vent or act in a way to conclude how the air is flowing.

Those that can do, those that can't make up excuses.

stick it to the bottom of the vent. It works.

:rolleyes: You're the expert.


OP: It's wouldn't be a bad thing to try if you're bored, but I would take the result with a grain of salt. Unless the string (shouldn't be more than a inch or two long) sucks into the vent without a doubt, I wouldn't make any conclusions one way or the other.

The positioning of the vent looks good, and it will definately help extract heat and high pressure from your engine bay (as you move, airflow into the radiator and engine bay creates pressure under your hood, this vent will help that as well). And the vent will help radiate heat out from under your engine bay when you're stopped.

0.02

More Pics!!!

I'm sorry I can't let this die. Many people complained about the AK hood because it sucked air in, rather than let air out through the vents over the engine...this vent is in the same place, just like when people raise the back of the hood because they think it lowers temp by pulling air out, which it doesn't.

If he could show that air was going out at speed, then I'd do the same to my car. Until then, I'll plan on the carbontrix vent

Which is why a magnehelic gauge is useful for thoes of us without wind tunnels.




I like this newb.

Send me a pic of the AK hood and Carbontrix vent.

Raising the back of the hood opens a gap where their is high pressure (at the base of the hood) -which is why many muscle cars (and the Grand Am Rolex SpeedSource RX8) have their air intake facing backwards at the base of the windshield. I already stated this.

Most likely, air will not go in at speed due to the shape of the louver, position, high pressure in the engine bay etc...

Their is a low pressure zone at the sides of the base of the windshield. We raised the hood but blocked of the center high-pressure area while having an opening on the sides of the base of the windshield to vent the radiator exhaust/high pressure under the hood etc... in a different Grand Am RX8. It worked but had other adverse affects -as everything is related.

Aerodynamics is a lot more technical and in depth than you are making it out to be as everything affects eachother and their are many misconceptions and misunderstood physics behind many people's understanding of aerodynamics.

You last post was the first acceptable and nice post to reply to and debate, I hope you can keep up that maturity.

Or you can hook up some pressure gauges to a Motec and datalog your runs and see the pressure effects at varying speeds ;)

Incorrect, they complained because some questioned the funcionallity and asked for test data. AK got upset took their ball and left to play with CR. There was no data on either side of the argument.

The AK hood originally had 3 gaping sets of vents.


If you can ship me a functioning motec for $25 I'd use that instead. :giggle:

ah yes. Then I stand corrected and its still up for debate...unfortunately. It would be cool to get a straight answer on this before I start cutting. I thought Emelio did something with it.


I could go for some motec in my life life too.

Maybe i'm just spoiled...;)

Sure, if you pay for shipping, you can borrow my M800. You'll need your own pressure sending unit though...

of course it is. But if the string is going out the vent, there is a pretty good chance that you're winning the heat battle.

heh, you're right, but it just reads weird like some of the ethug posts.

http://www.unitednuclear.com/smoke.htm

put some of these near your turbo in a can or something and go for a drive. voila.

I very well may take you up on that offer. Not today. But when I've got some other things sorted out, it could be very useful.

http://www.evhill.com/products/products.htm

That color is freaking nice, minus the chips. I like how they follow the hump in the hood. At idle the heat pours out those vents, I have the AK hood and it does the same,,,At speed though I don't know i'm usually to busy driving and listening to it spool rather than try to give a shit about 20 or 30 degrees.

Is it really that important on a street car, Or am I missing something?

haha, damn, this thread blew up =P I'm uploading pics currently ...

The color is from Toyota, but I don't know what the code is. It's a dark gray with blue, red, and gold flake. I want to repaint the front bumper and clear bra it ... but that'll have to wait for a couple months while I build up my bank account.

The car is eventually going to be my dedicated track car, so the louver is on there so I can vent off heat between runs.

BenR, I'll have to take you up on your offer. I'm curious to see what happens to the air at speed.

Nice, where do you live? In Alb? I noticed you and BenR are friends.

Fireindc: I've been chatting with you on RSW about the MegaSquirt tuning that you're planning on doing ^_^

looks pretty good, feel bad for your bumper though, also I hate these rims...

To the OP...

You car's color looks cool... but the only picture where it looks good is with the GT3s... please stop putting those shitty Honduh wheels on (the bottle caps looked bad too).

apparently you're in Santa Fe. I miss that place.

With my VERY low level physics knowledge, I would expect the air to come out of the hood since the air flowing over the hood will be at higher speed than the air in the engine bay. Faster air = lower pressure, therefore the air from inside the hood will try to equalize pressure and come out of the hood.

Personally I love all the "string to check airflow" arguments on this forum lately. 1 - Hustler gets to bash people. 2- It's friggin free and takes so little effort to do why argue about it!

Just try it. If the ribbon/yarn/string sucks into the engine bay it's not working. If it is blowing out, guess what! It's a pretty good chance the vent works. If you want to know exactly how well it works you gotta get more technical with pressure gauges and thermometers to check the cooling effects.

Not trying the ribbon 1st is like draining your oil to see how much is in the crankcase instead of just looking at the dipstick. For just about anything in life - always try the easy free method 1st. If that's inconclusive then move on to more technical methods.

It doesn't work. I live by a wind tunnel, I know these things.

It'll only work with metal wire or cable...

:giggle:

Doppelganger: I keep putting Honduh wheels on because they're cheap and readily available. If I can get 4 sets of honda wheels with tires for the price of a set of gt3s with tires, then I'll get the honda wheels =P

Sorry dude, your big fat ass does not count as a wind tunnel.:bang:

Keep GT3s,
Sell all honda wheels for money for tires for said GT3s
Profit
:)



Seriously though, as a fellow wheel whore, sometimes it's hard not to experiment. Hell, at one time i had 6 sets of wheels lol

I like it :)

Would've been cleaner with countersunk rivets or even better with epoxy (no rivets)

Do you have any problems with the windshield fogging up on muggy days?




Rick


98 Aztek T/A WS7 (FOR SALE!!)
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It's riveted on =P I haven't had any issues with fogging or anything yet ... but the next time it's raining/snowing, I'll let you know =)

*Edit*

I meant countersunk rivets (could've sworn I typed that lol)

ah yeah, countersunk rivets would've been cool ^_^ I don't know how well epoxy would stand up to the heat from the sun as well as the turbo.

So I'm happy to report that even without a heatshield, I didn't have any brake fade from boiling the fluid in the proportioning valve. This is even after almost 2 hours of driving on the freeway, autocrossing, and then driving home. I just need to finish up my radiator scoop and then I can stop worrying about overheating =)

Epoxy would hold as long as it's applied correctly :cool:

It's basically the same goo used to sandwich aftermarket hoods together...