whataboutno

I've seen your build, very inspiring! The vent is not made of metal. I think it's FRP. It's pretty sturdy and it was made to go on a hood, so I'm pretty sure it will take heat pretty well.

Here are the dimentions:

Cspence

iTrader: (11)

Thanks! Not to be a complete moron, but what is FRP?

Nevermind, Fiber reinforced plastic....google ftw

m2cupcar

iTrader: (5)

Me too- before the cooper scooper. Actually bought one and laid it on the hood, which made me realize just how long the ZX's hood actually is. About that time Ben cut the extractor in his hood just behind the rad and had great results- that convinced me. The best solution IMO is reducing the positive pressure under the hood- it works well at speed and at a stop.



This was my second option for something over the turbo, an 80s trans-am fender extractor:

whataboutno

Where were you when I was looking for pictures of that scoop on a miata! Haha
That Trans Am scoop looks nice too

m2cupcar

iTrader: (5)

It's posted here... somewhere.

Uneek719

Nice hood! It looks like it would work well. I have been thinking of doing something similar with a vent on both sides, like Autonixion's hood

mikewolf

iTrader: (2)

I've got that same datsun scoop in my hood. It was installed by the previous owner and I didn't know it was from a datsun until this thread. Thanks,

Pen2_the_penguin

iTrader: (4)

Thats sexier than the cooper scooper... but whats more efficient... an extractor or intake scoop?

cueball1

iTrader: (13)

Both of those look intended to deal with heat from the turbo, not to help with flow through the heat exchangers. That Nissan vent with the Naca in front will vent turbo heat but the Naca will be adding to the pressure under hood I'd think.

Here's the pic I've been looking for. Looking at the pressure differentials the optimal spot for flow out of the engine bay looks like it would be further forward.

mikewolf

iTrader: (2)

Do you have a similar grid for an NA? It looks like the shape of the headlights might be causing the low pressures so an NA may have different different low pressure areas.

whataboutno

Got any pics?

chpmnsws6

iTrader: (12)

So has anyone made a pressure grid for an NA? I've searched for it a bit this morning but have come back empty handed.

Pen2_the_penguin

iTrader: (4)

Thank god someone revived this... any progress? I am also insterested in a grid for an NA

chpmnsws6

iTrader: (12)

I have a second hole in the hood with a carbontrix vent, but the hole is cut in a way that the vent can be shifted forward/backward about 2 inches. Its not riveted in yet since I'm going to strip and polish the hood.

hustler

iTrader: (6)

not yours:

chpmnsws6

iTrader: (12)

Neat. Now do you have a grid showing the pressure differential on the hood? My cutout is in the same location.

m2cupcar

iTrader: (5)

I think you'd be safe referencing the pattern of pressure on the NB hood. Pressure is definitely relative to the coordinates on the hood. Based on that assumption, the further forward the extractor the better it will reduce pressure. Hustler's is just about in that location. You need also consider that too far forward is going to put the scoop over top the radiator. My cooper scooper sits with the tail end just in front of the hood bubble.

chpmnsws6

iTrader: (12)

Progress so far. Sorry about the crappy pictures.

chpmnsws6

iTrader: (12)

hustler

iTrader: (6)

A little air foil or raised portion in front of the vent will also dramatically decrease pressure over the vent. I taped yarn to the inside of the vent in my new hood and the yarn stood straight up and flew off after a few miles thanks to scotch tape...the FM just let the yarn dance around a bit although it did effectively pull air out.