Heat soak - vented hood options that are not "louvered"

theDreamer · 11-11-2013, 07:51 AM

This is probably the hood many of you would like. It keeps all the factory lines of the hood and just generates 2 parallel lines opening to vent air in the front. For those worried about the weather, even with mesh or a grill, there are other options to consider.

Hood to consider:

( Click to show/hide )

Here is an option to protect your engine bay, these are rain guards (came with my Seibon hood), which attach via a few bolts.

( Click to show/hide )

Adding those to the hood will give you the ability to block out the hood if you want to protect the engine area or even need to keep heat inside the car for winter reasons. Also giving you the option to remove quickly when you need to.
Also, I ran some early tests with the OEM hood and my stage 1 SC and will be adding a Seibon TS hood later to get a comparative results. Currently waiting to get the hood on and finish the results. OEM Hood v Seibon TS Testing

Chuck33079 · 11-11-2013, 07:57 AM

Quote:

Originally Posted by theDreamer

This is probably the hood many of you would like. It keeps all the factory lines of the hood and just generates 2 parallel lines opening to vent air in the front.

That looks like exactly what we need.

MyKindaGuise · 11-11-2013, 08:28 AM

Quote:

Originally Posted by theDreamer

This is probably the hood many of you would like. It keeps all the factory lines of the hood and just generates 2 parallel lines opening to vent air in the front. For those worried about the weather, even with mesh or a grill, there are other options to consider.

Hood to consider:

( Click to show/hide )

That is what I am looking to do with my hood. Or vents to go right over the turbo/downpipe or the header area would be useful I would think.

SouthArk370Z · 11-11-2013, 08:53 AM

Just got back from running the tattletale test. Removed the rear hood seal. Taped two pieces of twine (some fluorescent pink stuff I had hanging around, the stuff you see used on construction sites to hold a spirit level) to the back edge of the hood where the creases in the hood are and another to the wiper arm (centerline of car). Up to about 30-35 mph, they didn't move at all. Above that, they indicated that some air was going into the engine compartment.

But that may have just been turbulence. I parked and turned the A/C on to turn the radiator fan on. Engine was well warmed up (170F oil temp) but I could feel no heat coming from the rear of the hood. On inspection, I found the gap between the hood and the engine compartment is very small.

My conclusion is that removing the seal doesn't accomplish much, if anything. Off to put the seal back on.
Edit: the fasteners for the seal are not evenly spaced, so it's all but impossible to install it wrong.

Chuck33079 · 11-11-2013, 08:59 AM

Quote:

Originally Posted by SouthArk370Z

Just got back from running the tattletale test. Removed the rear hood seal. Taped two pieces of twine (some fluorescent pink stuff I had hanging around, the stuff you see used on construction sites to hold a spirit level) to the back edge of the hood where the creases in the hood are and another to the wiper arm (centerline of car). Up to about 30-35 mph, they didn't move at all. Above that, they indicated that some air was going into the engine compartment.
But that may have just been turbulence. I parked and turned the A/C on to turn the radiator fan on. Engine was well warmed up (170F oil temp) but I could feel no heat coming from the rear of the hood. On inspection, I found the gap between the hood and the engine compartment is very small.
My conclusion is that removing the seal doesn't accomplish much, if anything. Off to put the seal back on.

So it stands to reason that if we opened that gap up somehow we would be making matters worse as far as airflow is concerned? Thanks for actually testing it, too much of this is theory.

SouthArk370Z · 11-11-2013, 09:09 AM

Quote:

Originally Posted by Chuck33079

So it stands to reason that if we opened that gap up somehow we would be making matters worse as far as airflow is concerned? Thanks for actually testing it, too much of this is theory.

Looks like it.

I'm rather surprised the the radiator fans wouldn't push at least a little bit of air out when parked. Where is the air going?

It would be interesting to see a similar test run with the undertray vented. But I'm not gonna hang my head out the door and look under the car while going 60 mph.

MyKindaGuise · 11-11-2013, 09:56 AM

Quote:

Originally Posted by SouthArk370Z

Looks like it.

I'm rather surprised the the radiator fans wouldn't push at least a little bit of air out when parked. Where is the air going?

It would be interesting to see a similar test run with the undertray vented. But I'm not gonna hang my head out the door and look under the car while going 60 mph.

Has anyone looking into a very high static pressure fan setup yet? I know the GTM fans are better but does anyone have static pressure data on stock vs gtm?

dmhenderson · 11-11-2013, 10:07 AM

Quote:

Originally Posted by MyKindaGuise

Has anyone looking into a very high static pressure fan setup yet? I know the GTM fans are better but does anyone have static pressure data on stock vs gtm?

Man, I just loathe to give GTM any more of my money.

DIGItonium · 11-11-2013, 10:26 AM

Quote:

Originally Posted by theDreamer

This is probably the hood many of you would like. It keeps all the factory lines of the hood and just generates 2 parallel lines opening to vent air in the front. For those worried about the weather, even with mesh or a grill, there are other options to consider.

Hood to consider:

Achieved... thanks to Aero Jacket:

( Click to show/hide )

Chuck33079 · 11-11-2013, 10:27 AM

Quote:

Originally Posted by DIGItonium

Achieved... thanks to Aero Jacket:

( Click to show/hide )

If I end up with a vented hood, that's the one.

DIGItonium · 11-11-2013, 10:31 AM

Quote:

Originally Posted by Chuck33079

If I end up with a vented hood, that's the one.

The vent closest to the windshield works great. The other one doesn't do much. Another drawback is weight. With the reinforcements put in place the hood is several pounds heavier than the stock hood. I could care less, though. It's functional and easy on the eyes.

Chuck33079 · 11-11-2013, 10:33 AM

Quote:

Originally Posted by DIGItonium

The vent closest to the windshield works great. The other one doesn't do much. Another drawback is weight. With the reinforcements put in place the hood is several pounds heavier than the stock hood. I could care less, though. It's functional and easy on the eyes.

So that's available from Aerojacket, or did you have a shop make it for you?

DIGItonium · 11-11-2013, 10:35 AM

Quote:

Originally Posted by Chuck33079

So that's available from Aerojacket, or did you have a shop make it for you?

They have to cut one up. The result is nasty and requires lots of prep from the body shop if they're willing to work on it. I basically spent $1300 or so, and that includes the hood, mods from Aero Jacket, and the labor from the body shop to clean up the work, reinforce, and paint.

Chuck33079 · 11-11-2013, 10:39 AM

Quote:

Originally Posted by DIGItonium

They have to cut one up. The result is nasty and requires lots of prep from the body shop if they're willing to work on it. I basically spent $1300 or so, and that includes the hood, mods from Aero Jacket, and the labor from the body shop to clean up the work, reinforce, and paint.

So it's basically a custom hood. Damn, I was hoping for something off-the-shelf where I just needed to have it painted.

Nixlimited · 11-11-2013, 10:55 AM

Quote:

Originally Posted by DIGItonium

They have to cut one up. The result is nasty and requires lots of prep from the body shop if they're willing to work on it. I basically spent $1300 or so, and that includes the hood, mods from Aero Jacket, and the labor from the body shop to clean up the work, reinforce, and paint.

Damn. I too would buy that hood if it were available.

11-11-2013, 07:51 AM	#1 (permalink)
theDreamer A True Z Fanatic Join Date: Feb 2009 Location: Texas Posts: 30,879 Drives: 370z Rep Power: 4212	This is probably the hood many of you would like. It keeps all the factory lines of the hood and just generates 2 parallel lines opening to vent air in the front. For those worried about the weather, even with mesh or a grill, there are other options to consider. Hood to consider: ( Click to show/hide ) Here is an option to protect your engine bay, these are rain guards (came with my Seibon hood), which attach via a few bolts. ( Click to show/hide ) Adding those to the hood will give you the ability to block out the hood if you want to protect the engine area or even need to keep heat inside the car for winter reasons. Also giving you the option to remove quickly when you need to. Also, I ran some early tests with the OEM hood and my stage 1 SC and will be adding a Seibon TS hood later to get a comparative results. Currently waiting to get the hood on and finish the results. OEM Hood v Seibon TS Testing __________________ theDreamer's Z // Fast Intentions // Uprev // GTM // HKS // TEIN theDreamer's Silvia // URAS // GREDDY Houston Zs // Facebook // Twitter // Instagram

11-11-2013, 08:53 AM	#4 (permalink)
SouthArk370Z Premium Member Join Date: Nov 2010 Location: South Arkansas Posts: 8,435 Drives: 2014 Challenger Rep Power: 324199	Just got back from running the tattletale test. Removed the rear hood seal. Taped two pieces of twine (some fluorescent pink stuff I had hanging around, the stuff you see used on construction sites to hold a spirit level) to the back edge of the hood where the creases in the hood are and another to the wiper arm (centerline of car). Up to about 30-35 mph, they didn't move at all. Above that, they indicated that some air was going into the engine compartment. But that may have just been turbulence. I parked and turned the A/C on to turn the radiator fan on. Engine was well warmed up (170F oil temp) but I could feel no heat coming from the rear of the hood. On inspection, I found the gap between the hood and the engine compartment is very small. My conclusion is that removing the seal doesn't accomplish much, if anything. Off to put the seal back on. Edit: the fasteners for the seal are not evenly spaced, so it's all but impossible to install it wrong. Felix 808 likes this. __________________ Steering Lock Links - Search The370Z Bookmarklet - FSM @ NICOclub Mankind has progressed past the need for war but we haven't evolved that far. - NachoMahma Last edited by SouthArk370Z; 11-11-2013 at 08:57 AM.

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