I have a Mase kit w/ recirculated exhaust. I live in Oklahoma and it can get up to 100 degrees here in July. I have a seibon top secret hood on my car now but I'd like to go back to a stock hood. I don't daily my car and I've never once had it overheat with the ac blasting on a 100 degree day in traffic sitting at stop lights or on the highway.

I assume that since my dp and wg recirculated tube both heat wrapped that helps alot on my underhood temps by not blowing exhaust straight down.

Do I really need the vented hood? It weighs more and figment isn't perfect

 

I wouldn't go so far as to say that you need it, but personally I would never turbo an S2000 without venting the hot air somehow.

Mine overheated this past summer, and I vented the hood the very next day. It turns out that one of my fans was unplugged and that's probably what caused it to overheat. But after seeing the temp gauge go all the way across, I'll do whatever it takes to keep the engine bay cool. That's partly because I live in Atlanta, where 'sitting in traffic' can mean taking 45 minutes to travel one mile.

Cutting vents in the OEM hood is very easy if you don't like the Seibon.

 

You have (2) choices either keep the heat in or let it out. Personally I like to keep the heat in at the source and ATP seems to be the best method by far I have found but it is not cheap. Daryl's kit was ATP wraped and it was not much hotter than a stock car really, it was definatly night and day compaired to mine.

 

I have a turbo blanket on, dp wrapped and wg recirc wrapped up. Pretty sure I'm going to go back with the stock hood until i can buy a j's hood and paint it. (way better figment and quality)

 

That manifold also puts out a lot of heat. ATP wrap difference measured with IR gun was 200 degrees cooler most of the time. In your case a vented hood is a nice option.

 

Do you have fuse box and battery in stock location? If so, I'd vent. I ran w uncoated parts and no vent for a week, amount of heat there was ridiculous.

 

I have a Greddy turbo in Tx and I added a vented hood this summer after my car overheated at the track.

 

i have a inline pro style sidewinder manifold with the oil filter relocated to the cross member

after i installed a seibon vented hood, it dropped my oil temps down about 10 degrees.

it worked perfectly.

 

I have a vented hood. It was on it when I got the car. I doubt that the vented hoods actually do anything. fresh air can get in from the bottom and from the front where the radiator is. I know hot air rises and if the car didn't move I would imagine a vented hood could help. But at 60mph I would imagine new air would find it's way under the hood unless the car can drag all that hot air with it down the freeway. I'm not even going to pretend I know the airflow dynamics at high speeds, but I'm sure air is going to be circulating from different directions.

 

My car overheated while stuck in traffic. We moved ~200 yards in 15 minutes on a hot sunny day. Vented hoods may not make a difference while the car is moving, but they sure do help when it's not. And that's precisely when it matters.