stock hood scoop: functional?

[kkrkeith7]

i was wondering if it was, it looks like it filters the air down behind the tranny our something if you look under the hood, just curious.

[nudge1201]

at most it cools the exhaust manifold. (correct me if I wrong)

[xangrystylex]

if your hood has a hole in it for the scoop like mine does then it is functional.

[2002GT_Celica]

Originally posted by nudge1201
at most it cools the exhaust manifold. (correct me if I wrong)

That's what I heard, don't know if it is true though. Regardless, it could be really functional if you somehow position a CAI right by the hole like my friend thinks would be a good idea.

[EzRidA]

Yes it's functional. If you pop open the hood and follow where the black piece flows air you'll see that it sends it to a deflector that leads to the exhaust manifold. Yes that was a run on sentence. :)

yup yup goes straight for the exhaust manifold. I always make fun of my dad cause he tries to say the Celica is like his Mustang with the hoodscoop, but i always say "well at least mine is functional and not all closed and blocked off" hehehe.

[GTS LAID]

i tried to find out just how functional it was by taking a thermometer to it... and guess what... right on top of the hood anywhere but infront of the scoop the temp was 5 degrees higher (0 wind) ... the temperature in front of the hoodscoop was 26 degrees higher... so its definately dissipating heat..

and when you're rolling, the increased airflow helps as well...

[Blue Bomber]

The air is actually directed at the firewall. The headers are right next to it because our engine sits backwards, so Toyota decided it needed extra cooling.

[Kit99bar]

cooling the firewall or exhaust manifold = no performance gains

correct?

[EzRidA]

Originally posted by Kit99bar
cooling the firewall or exhaust manifold = no performance gains

correct?

Yes and no. Your car doesn't run as optimal with more heatsoak. That's one of the advantages of a CAI. It just isn't increased airflow, but it's colder denser air. The engine operates optimally at a set temperature. So basically anything that get the engine to that temperature is a performance gain. Also you aren't going to gain more hp, but you might make your complete peak power or reach your car's full performance.

[atehrani]

"Speedholes!" :chuckles:

[BoyRacer]

so technically teh larger hood scoop would increae airflow thereby increseing the amount of cold air availible to the header. but, it may also offer greater drag, and less aero dynamics. i wonder if the positive and negative cancel itself out? i have never scrutinized the aftermarket scoop. opinions anyone?

[EzRidA]

Originally posted by BoyRacer
so technically teh larger hood scoop would increae airflow thereby increseing the amount of cold air availible to the header. but, it may also offer greater drag, and less aero dynamics. i wonder if the positive and negative cancel itself out? i have never scrutinized the aftermarket scoop. opinions anyone?

You have to find the perfect harmonic balance between the two. I doubt aftermarket hoodscoops did that. However I think Toyota did. :)

[Blue Bomber]

The only reason it's aimed at the firewall is to keep the passenger compartment from heating up. It really wan't put there with the intentions of improving performance.

[Furies]

lol....anyone see the simpsons episode where homer took a pick axe and punctured like 8 holes in his cars hood ?

[racinjason]

Reason from TRD is for cooling and areodynamics. Either way Toyota designed it to be functional for a purpose. So don't buy a strut bar that blocks the airflow. Thats why I designed my bars to allow the air to flow through. Now if I can just get the orders to get the shop to build them. :)

[borpph]

Originally posted by racinjason
Reason from TRD is for cooling and areodynamics. Either way Toyota designed it to be functional for a purpose. So don't buy a strut bar that blocks the airflow. Thats why I designed my bars to allow the air to flow through. Now if I can just get the orders to get the shop to build them. :)
Awww, really Jason? I just bought an RMM polished strut bar. :( That is a great idea. I wish I heard of it earlier.

[DJ_GLITCH_OS]

I wonder if you could some hopw redirect it to run more over the head and then down the manifold.....hummmmm...
I think I'm gona try it.

[Jesse IL]

Airflow there will also serve to suck hot air out of the rest of the engine compartment. All the hot air that passes through the radiator will be sitting in the engine compartment. Airflow through the scoop directed down the firewall will create a low pressure area right over the head. This low pressure area will draw the hot air over the engine where it will joing the airflow and be sent out under the car.

[oo_snoopy]

"Speedholes!"

I've seen that one.

[TRDCeliCaGTs2k]

the reason its there is to send air to the cat which creates whats called a pulse air system, air is directed to the cat to burn unspent gases coming from the engine to lower NOx & CO levels for emmisions, every car has it but this is toyotas design for the celica, thats why if you put your hand in front of the exhaust tip you can feel the pulsation.

[Blue Bomber]

Originally posted by TRDCeliCaGTs2k
the reason its there is to send air to the cat which creates whats called a pulse air system, air is directed to the cat to burn unspent gases coming from the engine to lower NOx & CO levels for emmisions, every car has it but this is toyotas design for the celica, thats why if you put your hand in front of the exhaust tip you can feel the pulsation. How does the hoodscoop have anything to do with the cat or exhaust system?

[LEDmod]

Actually exaust manifold does not need to be cool...
Exaust manifold/ header needs to hotter to perform better... heat creats faster air flow on header.....
In my ideal is to keep the firewall area cool.... for passenger compartment... while keeping the the whole engine bay cooler also...

[Jesse IL]

Originally posted by TRDCeliCaGTs2k
the reason its there is to send air to the cat which creates whats called a pulse air system, air is directed to the cat to burn unspent gases coming from the engine to lower NOx & CO levels for emmisions, every car has it but this is toyotas design for the celica, thats why if you put your hand in front of the exhaust tip you can feel the pulsation.

Dude, you are confusing two systems. Air injection into the exhaust to clean up emissions has been around for almost 20 years now.

[Griffin]

Not to mention this car doesn't even USE air injection into the Cat... No Toyota OBD2 vehicle ever has...

Griffin

[kawika]

the site www.killyourself.com actually werks !!! hehehe

[Slant]

Many of you are mistaken.
Warmer gas will move out quicker, which is what you want out of your exhaust. Colder is not always better.
I agree 100% with what Dooly said.

Also, the scoop will create more drag; however, I dont think it will be detrimental to our acceleration.

The hood scoop is somewhat functional, but not purely performance-minded. Not having it would make little difference in performance.

[Blue Lucifer]

I thought it helped get rid of stale hot engine heat through the underbody of the car? OH well. whatever it is, I like it. Pretty.

[Griffin]

Originally posted by Slant
Many of you are mistaken.
Warmer gas will move out quicker, which is what you want out of your exhaust. Colder is not always better.
I agree 100% with what Dooly said.

Also, the scoop will create more drag; however, I dont think it will be detrimental to our acceleration.

The hood scoop is somewhat functional, but not purely performance-minded. Not having it would make little difference in performance.

Yup yup - anyone thats ever had to try to squeeze every last drop of horsepower out of a car knows that thermal wrapping your header(s) to get em to retain heat nets you a small performance gain. Looks oogly though.

Grififn

[BRAK]

I swear when my hood scoop was getting repainted and i drove my car around without it on. The car felt more responsive!.Might of beemy imagination .. but the lift was like BAM!!:burnout:

[LEDmod]

Originally posted by Griffin


Yup yup - anyone thats ever had to try to squeeze every last drop of horsepower out of a car knows that thermal wrapping your header(s) to get em to retain heat nets you a small performance gain. Looks oogly though.

Grififn


Here is the thing about getting little more HP from header..
http://www.jegs.com/cgi-bin/ncommerce3/ProductDisplay?prrfnbr=1351&prmenbr=361
Might work... might do nothing.. but I'm gona try it out.. later...
Hope this little secret power gainer.... help out.....
Domestic cars has been using this for years.....!!!!! ^^

[voidhawk]

Originally posted by racinjason
Reason from TRD is for cooling and areodynamics. Either way Toyota designed it to be functional for a purpose. So don't buy a strut bar that blocks the airflow. Thats why I designed my bars to allow the air to flow through. Now if I can just get the orders to get the shop to build them. :)

When you designed your strutbar, did you do a stress or load path analysis? I was looking around your site to find some info, but didn't find anything on that. If you could post pictures showing FEM or something, indicating that all the holes in your bar don't degrade it's stiffness or strength, I think it would go a long ways to get people interested. How much does it weigh? Do you get a better strength/weight ratio because of the "cellular" design? I like the idea, but was hoping for more info.... thx!