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How much do vented hoods reduce temps?

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Old Sep 20, 2004 | 10:41 PM
  #26  
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I like this BMW Z3 gills in the hood.

Anyone know where I can get some used ones?

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Old Sep 20, 2004 | 10:48 PM
  #27  
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Here you go...in black too

http://cgi.aol.ebay.com/ebaymotors/w...category=33645
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Old Sep 20, 2004 | 10:58 PM
  #28  
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If I were looking to add cosmetics, then I would consider a vented hood.
If I were looking to lower coolant temps, then I would first consider the fan mod, a Miata thermoswitch, and a larger radiator. The most cost-effective solutions first.
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Old Sep 20, 2004 | 11:01 PM
  #29  
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Those "Z3" gills are hardly vents!

I would opt for a Mazdaspeed one,..l.

I read a big article and even had a thread started in the past (ahem, somewhere else) about temps and how to lower them and a couple of "vent" owners didn't see much of a change, others did, oh well....
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Old Sep 20, 2004 | 11:02 PM
  #30  
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Originally Posted by JONSKI
If I were looking to add cosmetics, then I would consider a vented hood.
If I were looking to lower coolant temps, then I would first consider the fan mod, a Miata thermoswitch, and a larger radiator. The most cost-effective solutions first.
By fan mod do you mean fan switch? In which place the Thermoswitch kind of takes its place by doing it automatically at a given temp?

I plan on doing those 2-3 things before a hood as well . the thread i started was about the most EFFECTIVE way to reduce temps...
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Old Sep 20, 2004 | 11:31 PM
  #31  
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Originally Posted by lopedl
I would just send it to you in a pm, but since this thread is in reference to hoods, I'll post the pict.


is that your car? its RHD
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Old Sep 21, 2004 | 01:22 AM
  #32  
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Originally Posted by seanfd3s

is that your car? its RHD
Nope. He's posted previously that it's not. If you check the photo's properties, it's sourced for RE Amemiya's website.
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Old Sep 21, 2004 | 01:27 AM
  #33  
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yea i saw that, thats why i asked
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Old Sep 21, 2004 | 01:27 AM
  #34  
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yea i saw that, thats why i asked. was gonna post a BS
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Old Sep 21, 2004 | 08:58 AM
  #35  
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arent you guys afraid of water getting into those vents one way or another?
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Old Sep 21, 2004 | 09:10 AM
  #36  
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I think a vented hood would drop temps noticeably. I just pop my hood before going up my driveway to park, and you can see the heat practically pouring out.

I heard that if you remove the power steering and the a/c the underhood temps will go down considerably for those of you who don't want a vented hood.
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Old Sep 21, 2004 | 09:36 AM
  #37  
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Originally Posted by technician
I heard that if you remove the power steering and the a/c the underhood temps will go down considerably for those of you who don't want a vented hood.
Don't believe everything you hear. Ask yourself a very simple question: What does removing the power steering and the a/c have to do with making underhood temps less??? The a/c and power steering do absolutely nothing in heating the surrounding air up compared to the engine, turbos and exhaust and I assume you would keep all of those...

Everyone also keep in mind that underhood temps and coolant temps are two distinctly different things. I would expect a vented hood to have at least a slight effect on coolant temperature but I would expect it to have a much greater one on underhood temperature. (FYI the first thing I do when crossing the finish line after a run is pop the hood. The short cruise back to the paddock does help in cooling everything off. Not much, but it's free. A garden sprayer takes care of the rest.)

Last edited by DamonB; Sep 21, 2004 at 09:41 AM.
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Old Sep 21, 2004 | 10:37 AM
  #38  
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Wouldn't removing parts under the hood create more air flow so that heat can escape more easily?

That's what I noticed when I had a '86 SE and started to removed "stuff."

Generalchaos, I pressure wash my engine once a week, so water in the engine area is not a problem.
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Old Sep 21, 2004 | 11:25 AM
  #39  
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Originally Posted by bricke
err.. not net yet anyways
Well if that means your wife is a virgin then, well...

Dave
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Old Sep 21, 2004 | 01:43 PM
  #40  
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wicked lookin FD Batman, that was my plan when i got my RX-7--the whole stealth look
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Old Sep 21, 2004 | 02:25 PM
  #41  
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Originally Posted by BATMAN
Wouldn't removing parts under the hood create more air flow so that heat can escape more easily?

That's what I noticed when I had a '86 SE and started to removed "stuff."

Generalchaos, I pressure wash my engine once a week, so water in the engine area is not a problem.
Well, there would be less metal to "heat soak" so I think it may be a bit easier to cool the engine bay temperature down...I don't know if it would be noticible though...
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Old Sep 21, 2004 | 05:52 PM
  #42  
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Originally Posted by BATMAN
, I pressure wash my engine once a week.
Wha...? Wish I had that dedication. Whenever I see my car, I want to drive it more than anything else :P
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Old Sep 21, 2004 | 06:22 PM
  #43  
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Originally Posted by DamonB
Don't believe everything you hear. Ask yourself a very simple question: What does removing the power steering and the a/c have to do with making underhood temps less??? The a/c and power steering do absolutely nothing in heating the surrounding air up compared to the engine, turbos and exhaust and I assume you would keep all of those...

Everyone also keep in mind that underhood temps and coolant temps are two distinctly different things. I would expect a vented hood to have at least a slight effect on coolant temperature but I would expect it to have a much greater one on underhood temperature. (FYI the first thing I do when crossing the finish line after a run is pop the hood. The short cruise back to the paddock does help in cooling everything off. Not much, but it's free. A garden sprayer takes care of the rest.)
Removing the AC should help get more air through the radiator, which in turn will help get more air in the engine compartment. I think it would have a slight effect on underhood temps while the car is MOVING or when the fans are on.

The PS doesn't take up much room in front of the radiator, just the cooling loop. The pump takes up a little space but if you ditched both the PS and the AC you can also ditch the big bracket that holds them on.

Removing the PS isn't a good idea if you ever plan to auto-x. Ditching the AC is a personal choice, I couldn't live without it.
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Old Sep 21, 2004 | 06:25 PM
  #44  
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Originally Posted by BATMAN
Wouldn't removing parts under the hood create more air flow so that heat can escape more easily?

That's what I noticed when I had a '86 SE and started to removed "stuff."

Generalchaos, I pressure wash my engine once a week, so water in the engine area is not a problem.
I would say it is generally not a good idea to wash the engine weekly. No need to get it wet that often and it shouldn't get hardly any dirt on it in a week.
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Old Sep 21, 2004 | 06:58 PM
  #45  
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Originally Posted by SteveF
Well, there would be less metal to "heat soak" so I think it may be a bit easier to cool the engine bay temperature down...I don't know if it would be noticible though...

I was thinking of less stuff in there the faster and easier the air would flow in and outta the engine area.

right?
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Old Sep 21, 2004 | 07:00 PM
  #46  
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Originally Posted by turbojeff
I would say it is generally not a good idea to wash the engine weekly. No need to get it wet that often and it shouldn't get hardly any dirt on it in a week.
I got new harnesses and it's never been a problem.

I will push the head right in the alternator and clean out the dust at 2000psi.

been doing this for 5 years with ZERO problems.

it's an original alternator at 230k miles so something must be right.
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Old Sep 21, 2004 | 08:57 PM
  #47  
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Originally Posted by BATMAN
I got new harnesses and it's never been a problem.

I will push the head right in the alternator and clean out the dust at 2000psi.

been doing this for 5 years with ZERO problems.

it's an original alternator at 230k miles so something must be right.
Lots of people drink and drive for years and never have a problem, that doesn't imply it is a good thing to do.

Washing the motor every week is excessive and will lead to corrsion in places you wouldn't likely expect, the alternator isn't one of them. The alternator is well vented and spins all the water off the internals as soon as you start the car, any residual water will be evaporated away from the heat the alt produces since it is well vented.

I don't care if you do it, I'm trying to prevent some newbie from trying to mimic you.
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Old Sep 21, 2004 | 11:16 PM
  #48  
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I have been choosing between the RE AD9 Hood and the Scoot!

Would any one have experience as to which one or either would have more or less clearance for a single turbo than the stock hood.

It looks to me like the scoot hood actually has a bubble to it in the middle but both hoods look to have vents that actually go down into the engine bay that would actually take up hood clearance!

I am trying to install a rather large turbo under the stock hood with a 20B install and could use some more room..as well i would love to have a vented hood for heat extraction!

The turbo installed right now is tilted downwards to fit and comes within 1/4" of the hood...and the new turbo i have coming is almost 2" bigger in diameter.....

Picture included to show turbo location!
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Old Sep 21, 2004 | 11:21 PM
  #49  
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Originally Posted by 95R2-89TII Ground Zero
That's a hot *** car man. What lip is that?
That is a RE Amemiya AD Facer Front Bumper. The front lip is a seperate part that is optional for the bumper
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Old Sep 21, 2004 | 11:26 PM
  #50  
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Originally Posted by Auto Illusions
I have been choosing between the RE AD9 Hood and the Scoot!

Would any one have experience as to which one or either would have more or less clearance for a single turbo than the stock hood.

It looks to me like the scoot hood actually has a bubble to it in the middle but both hoods look to have vents that actually go down into the engine bay that would actually take up hood clearance!

I am trying to install a rather large turbo under the stock hood with a 20B install and could use some more room..as well i would love to have a vented hood for heat extraction!

The turbo installed right now is tilted downwards to fit and comes within 1/4" of the hood...and the new turbo i have coming is almost 2" bigger in diameter.....

Picture included to show turbo location!
I am not too sure about the 20B but I use the Scoot on my 13B and RX6 turbo with V-Mount. Only clearing issue is the strut brace. Other then that the turbo does not come close to the bonnet.
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