I have been wondering about this for quite a while now, and figure this would be the most lokley section to have answers. What I am looking for is if anyone has done anything to evacuate the underhood temps without "JDM Hood prop Yo" and without cutting a huge Evo hole in the hood. I was wondering if anyone has actually modified the hood skeleton, or the plastic cowl area around the windshield to let some heat out. I wouldn't be opposed to even doing something like two smaller naca ducts one on each side, but make them vent and not duct lol, but anyways, just wanted to see if anyone has done anything.

 

I really like the way this m3's setup is, because the upper vent really isn't that bad looking, and actually seems like it would work.

 

IT actually won't work, it is a high pressure area. Air will enter into the engine bay there and fill the engine bay, not exactly what you are trying to achieve.

If there is a way to do it a deep air damn with a proper undertray and good ducting through the wheel wells. If you can extract as much air as possible through the front wheel wells and exhaust it down the side of the car.

 

A high pressure area will let air in. That's why "cowl induction" hoods were used, to force air into the intake.



A low pressure area needs to be found to draw the air out of the bay.

 

Yeah that's what I was afraid of, I just didn't know if there were any other options that werent like the normal way guys do it. Guess I will just have to end up doing something like kungfuSiR's down the road and maybe just have Dzus cover to cap it durring the cooler months.

 

The one that kungfuSiR is very nice but what about us that are turbo and have a Ramhorn manifold. It will probably hit the vent. I have had ok luck with removing the front and rear hood gaskets on my integra and spacing the rear. Looking for a bit more.

 

I hear that, most setups so close to the front would dump rain right on the manifold, that is if it is a street car (which mine is) and that is no bueno.

 

What do you have done with your engine modification wise? What enviornment are you running in?

If you're looking for a track only cooling solution and have problems with overheating, wouldn't it just seem cheaper to find a used hood and cut it up and do it right?

 

The high pressure area of the hood is right on the front leading edge and at the base of the windshild (the cowl). Look up some racecar hoods (front engined) and see what I mean. No need to reinvent the wheel just copy what the big money R&D has discovered

 

Well right now im at 417whp on 9psi, and should be well over 600 this week, so there is alot of heat that gets produced, and it just makes it a tad too warm on the streets, and when I pop the hood you can deffinatley feel that it's trapped under there, but unfortunatley it is 80% street and 20% track, and I like keeping it as quiet and sleeper as possible, so a big hood vent was at the last of my wants, but you are totally right, I should just get a spare hood and rock that for the track days. And it's not shown in the pics but I have done a ton to keep the heat down, turbo blanket, wrapped downpipe, spal 1700cfm fan. And my environment is colorado, and latley it has been over 95* and thats when it gets too hot, under 80 is fine, but I haven't been able to drive since it has been up so high.

 

If you're having cooling issues, block off the opening to the side of the radiator. The lower the pressure in the engine bay, the more air will go through the radiator. The more air that gets around it, the higher the pressure in the bay, and the less effective the radiator.

 

+1

though i'm not sure thats going to solve the issue. you might want to look into a full sized tucked radiator.

 

Cut holes in firewall, problem solved, cockpit temperatures reach a new level of hot. Ask me how I know lol. Hot air rushes through the hole in my firewall where I ran the engine harness.

 

Do you have any idea what the underhood temps are? Cuz "it feels hot when I open the hood" doesn't really tell us anything.

 

^ "it feels hot" doesn't quantify it well enough? OP, do you have holes in your upper bumper cover?

 

Does your rad fan have a shroud? Are your wastegate dump tubes routed to exit under the car? From the pics it doesn't look like here is any piping to get the gate exhaust outta there.

-Drew

 

wrap the manifold
downpipe
turbo blanket
dump w/g outside of engine bay

 

That has deffintatley crossed my mind on doing that.

Yeah, I think that would be my best bet there.

LOL, thats a GREAT Idea!!

On a scale of 1 being stock, and 10 being the sun, it is about a 6 lol.

No extra holes in the bumper, the bumper support would block any flow.

Downpipe is wrapped, turbo is blanketed, and gates dump outside.

 

I don't know how "quiet and sleeper" a car with a turbo the size of a pizza and an external wastegate will be? If anything, someone will think you're ricer with a vented hood and think your car has less.

But try to block off and shroud the front radiator. That hole in the front gives a big positive pressure to your engine bay. With how much air is cramming in there, your best bet is likely cutting the hole above the header (but not on leading edge like Ferreira says).

 

Who made ur manifold??

 

my suggestion would be get a shrouded high CFM slim fan for the "stock" location on the radiator, and perhaps a pusher fan for the front. not enough to block flow of air with the fan, but enough to significantly increase the amount of air moving through the rad at all times.

has worked on several V8 cars for me...

 

Hahaha, E-Cutout, as long as I dont get into boost the car is pretty quiet, I have had numerous guys ask if it was boosted when cruising, I just tell them "maybe a little bit" haha. I acyually drove all day today and never got over 180* so I might just cut up another hood for summer moths when it's hot as F.

Boostwerks.....PM me before you even THINK about buying one.

I have actually been researching, and I am going to do a tucked scirocco rad under the support, and that way I will have a 3/4 sized one and will be able to put a monster 3000cfm fan on there. I just want to keep temps managable so I can try some time attack.


Thanks for the replys guys.