Hood Vent
- Thread starter AGlobalThreat
- Start date
Arg. Here I was thinking i was going to sound all smart by saying "the base of the windshield isn't low pressure, its high!" but poop.
And even then, I'm not sure our cars are aerodynamically efficient enough to actually that little bit of "downforce" make any sort of difference at all. I can't harp too much though, as I have a custom hood with a radiator vent myself
And even then, I'm not sure our cars are aerodynamically efficient enough to actually that little bit of "downforce" make any sort of difference at all. I can't harp too much though, as I have a custom hood with a radiator vent myself
umm common guys low pressure will "suck in" air. high pressure will push it out, shake up a can of pepsi (building UP pressure making it have a HIGHer pressure then before), then pop a hole in it with a pen. will it suck in air or push out?
MKivSupra_Rob said:
Yea, high pressure will push out to the lower pressure. In this case, the lower pressure zone is the ducting and the interior of the car.
Yes and the low pressure zone is inside the engine bay so i guess thats what i was trying to say but it came out wrong. Because there is indeed a high volume of air (or high pressure) at that point beacause it has to change direction and flow over the windshield, and if you shim the hood the high pressure will travel to the low pressure which is inside the engine bay. However airflow doesn't necessarily mean high pressure, it can create a vacuum which it does at the front since its flowing smooth. So if it flows over the vents it creates low pressure acting as a vacuum that pulls the hot air our of the nose of the car. Hows that sound?
Here's my undercover. Cost about $15 to make and I can definitely feel the difference at about 65+, car had a ton of lift without this in, probably due to my bumper opening allowing so much more air in. It keeps all the air that enters the front of the car from leaving under the car without going through the radiator. It increases the positive pressure in front of the radiator and also helps improve cooling. The hood vent will allow the air to travel faster through the radiator, I'm doing it more for the cooling gains than the aerodynamic benefit. Yes I know my ic piping is hanging low I still need to shorten it a bit.
I'm also still debating extending the undercover further back, it will increase the aerodynamic smoothness and flow under the car and will force more air out of the hood vent, although it will increase the pressure in the engine bay and that will in-turn slightly decrease the air flow through the radiator. So in other words I'm not sure if it's a mod worth doing imo. Our cars were designed to have the air dump out at the front of the oil pan. Sometimes toyotas designs were actually done correctly
A shineauto front lip would also be great with my setup, but unfortunately my car is too low in the front and theres no way I could drive around town without destroying it. Maybe someday I'll get coilovers and that great looking front lip.
Nice one, i'm gonna build an undertray too when i finally get some time, lol. Front and rear. Is that solid? Cuz it looks kinda flexy
AGlobalThreat said:
Here's my undercover. Cost about $15 to make and I can definitely feel the difference at about 65+, car had a ton of lift without this in, probably due to my bumper opening allowing so much more air in. It keeps all the air that enters the front of the car from leaving under the car without going through the radiator. It increases the positive pressure in front of the radiator and also helps improve cooling. The hood vent will allow the air to travel faster through the radiator, I'm doing it more for the cooling gains than the aerodynamic benefit. Yes I know my ic piping is hanging low I still need to shorten it a bit.
I'm also still debating extending the undercover further back, it will increase the aerodynamic smoothness and flow under the car and will force more air out of the hood vent, although it will increase the pressure in the engine bay and that will in-turn slightly decrease the air flow through the radiator. So in other words I'm not sure if it's a mod worth doing imo. Our cars were designed to have the air dump out at the front of the oil pan. Sometimes toyotas designs were actually done correctly
A shineauto front lip would also be great with my setup, but unfortunately my car is too low in the front and theres no way I could drive around town without destroying it. Maybe someday I'll get coilovers and that great looking front lip.
Is that your intercooler piping?
It hangs really low.
Cheers,
Roy
tte said:
You're joking right.. lol :icon_surp
Grimsta said:
Yes it is slightly flexible, I'm pretty sure its a kind of ABS plastic. So far I've shattered 2, this is the 3rd one I've made. Better/tighter/more mounting points and duct tape reenforcement seems to do the trick. This one has seen about 115 mph tops and held up fine, the only damage ever given to it was by scraping the dip from entering my apartments. This one has been on my car much longer than the other 2, which had poor mounting and no reenforcement. The previous ones failed by either coming undone from the mounting points or by tearing and then shattering as they hit the road. The duct tape prevents the tearing (It was wrapped extremely tight, I would have done more but ran out), and I have it mounted in about 10 different places to keep it holding straight and strong. This is obviously not perfect by any means, but for under $15 I can't complain.