I've been thinking about this. It could be one of the most effective/cheapest mod ever..

 

I've taken the plastics (and the wiper assembly) toward the back of the engine bay out before and, IIRC, that actually gives you quite a bit of opening between the hood and the engine bay. It can look a little unsightly if you look straight down and depending on what you have there (I have some wiring there), you may not want that area directly exposed to the elements.

 

I just want to remove the rubber seals for the hood and the battery/brake mc covers.

 

I haven't seen flow characteristics for the Z but the cowl near the windshield is typically a high pressure zone. Which means you'll be pulling air into the hood from there actually slowing air flow through the radiator, creating more heat build up. Which is why they seal off that cowl area, along with a few other reasons. If the Z is different I'd like to see some data or studies. The air coming into the engine bay typically will flow down over the headers and under the car, which isn't ideal either but more practical for a street car than cutting holes in the hood/fenders.

 

This is correct.

Removing the rear weatherstrip will have the air coming in the grille fighting the air coming in from the back of the hood.

Anyone Remember Cowl induction hoods? They used the high pressure zone to direct air coming INTO the engine bay into the intake.

So shims, removing weather stripping, etc =

 

Nice, ya all I've done is removed the weather strip and the battery/braker master etc covers. They go back on in literally a min.
I do remember cowl induction hoods and the air is being INDUCED by the engine drawing the air in on a carburated motor. They didnt work by air being forced in, but by the engine pulling in from the low pressure zone right below where the air hits the windshield.

The space Ive created by removing those couple things IMO will allow some heat out with convection.

I'll end up buying a cf vented hood but I'll be painting it. But low priority, i'd rather get a Koyo rad.

 

Not a fan of how those vents look, but for discussion's sake, what if those were installed the other direction (points towards the window)? Would it improve flow from the grill through the radiator and out the hood?

 

The Cowl area is a high pressure zone, meaning the air is going to just push its way in if theres room for it.. A lot of cars on ITBs do the shimmed hood thing to allow air to come into the ITBs.

Not only will this disrupt aerodynamics of the car (air should flow over it, not over the hood, into the engine bay [causing turbulence at that location] and then over the car.), But It really has no benefits for the Z.At idle, yes, it will allow for some heat to escape through there, but in motion?Na.

IMO the shimmed hood is more of a style thing.


If you are looking at maximing cooling, pre radiator is where you want some scoops...

 

They ARE pointed towards the window....?

This design should aid in allowing air thats been heated up by the radiator (and the engine, and the exhaust manifold lol) to escape.

 

OP wants the points towards the nose so air "rams" in. I was asking about tips towards the windshield so air escapes out like those louvres in the pic I posted.

 

The design you posted would be very effective in dissipating heat.