roof scoops [Archive] - Toyota MR2 Message Board

roof scoops [Archive] - Toyota MR2 Message Board Toyota MR2 Message Board > Toyota MR2 Generations > MK 2 MR2 - SW20 > MK2 Body Kits and Exterior Modifications > roof scoops PDA

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sleepermr203-25-2007, 11:57 AMlooking into getting one, or maybe two. can anyone point me to a site that sells the roof scoops? Hiighboost203-25-2007, 01:25 PMhttp://www.aerokits.net/MR2/indexmr2.htm reflexx04-06-2007, 01:39 PMi made my own 2 symmetrical scoops out of fiberglass. took about 2 days. They look and work a lot better since they're real ram air and are blended into the body line instead of looking like some kind of submarine periscope.

-D

http://www.astrocore.com/mr2/scoops1.jpg
http://www.astrocore.com/mr2/scoops4.jpg
http://www.astrocore.com/mr2/paint4.jpg
http://www.astrocore.com/mr2/clear2.jpg 5FistsoftheNorthStar04-06-2007, 01:56 PMI know damn well you didn't put f'n flames on the car did you...? sleepermr204-06-2007, 02:31 PMi wish i had the skills to do that.
i cant really tell how those scoops look on that site. anyone else have some pics or a site? doesnt bomex make something? MochaCaliGirl04-09-2007, 04:38 AMI'm actually thinking of this mod for my 86' but I wonder...does it really make a difference in cooling the engine? 5FistsoftheNorthStar04-09-2007, 09:07 AMI'm actually thinking of this mod for my 86' but I wonder...does it really make a difference in cooling the engine?

Not really...It just made for more drag on my car. The most efficient air supply your engine will receive is from the bottom of the engine bay and the side vents. Thats prolly why Toyota didn't make scoops in the first place. But I don't think anyone has actually done any temp tests prior and post to this modification.

If you or the O/P gets the scoop, please try and compile something, so that all of us would have a better idea of the functionality and purpose of these. My opinion is that its straight for looks, but with the Tom's scoops on my car made it look like a mouse from the front side view of the car. Gay....! sleepermr204-09-2007, 03:03 PMhaha mickey mouse. i was thinking that my car would look the same way cause its black ZMR204-09-2007, 03:33 PMTheres always carbon fiber ones I see on ebay too like those custom ones. Sang04-09-2007, 04:18 PMMost of the CF replicas you see are very poor fitting. Especially the Raceonusa parts. You'll probably spend more than than whatever you saved on getting them to fit right. acestro04-12-2007, 01:57 AMnow that is kool. If i knew to do that i woundn't be buying these kind of things. jakobe04-12-2007, 07:04 AMhttp://www.wickedbodies.net/Acc-90-95-MR2.html

they have the toms style scoops

never bought from them before though..dont know anybody who has..the y look like resellers. PHOENIX04-12-2007, 07:22 AMScoops are for asthetics only, there is no proof that they work (course there isn't that they don't work). I have one on my car, and it's for looks, not functionality. In a way, i would think that it would ruin the natural flow of air inside your engine bay since the air is moving upwards.

Lot's of companies sell the replicas, i have had good luck with www.visracing.com. These guys actually make there own replicas and most of the resellers you buy from, get it from these guys, might as well skip the middle man and get it from the source.

I personally think the toms scoop look a little horrid which is why i am going with the bomex scoops. I actually enjoy the look of bomex scoops on an mr2, but you have to get both sides for bomex.

This is mostly opinion, it's your car, you do what you want with it. If i was home, i would sell you my scoops for real cheap.

reflexx - third picture down, please tell me that is still not tape on your car and you forgot to pull it off and painted on it? got any more pictures? reflexx04-18-2007, 09:46 AMI know damn well you didn't put f'n flames on the car did you...?

I just repainted it again with a candy electric blue over black basecoat, with a violet ghost shimmer pearl on top. It's basically a color change blue to purple chameleon, but the chameleon effect is subtle, it's more like a shimmer. No flames this time around.

there are some pix of the blue/purple going on, the effect looks exaggerated/splotchy in the pix because there are no less than 6 light sources in my garage...

look at the bottom of...
http://www.astrocore.com/mr2/

in the sun it should look more like this: http://www.astrocore.com/images/rx7.jpg


Scoops are for asthetics only, there is no proof that they work (course there isn't that they don't work). I have one on my car, and it's for looks, not functionality.

Mine really work, the ones you see for sale are like a bent profile that's half an inch wide, no room for any air to flow, no air will ever make it down them. Mine are huge and have a large swept inner profile the whole way in (look at the mesh in the first pic up top, you can visualize the air path), and dump a massive amount of air down the scoops. I didn't make them for putting air in the engine bay, at the bottom of each scoop is going an oil cooler, it's as good as having the oil cooler on the front of the car.


reflexx - third picture down, please tell me that is still not tape on your car and you forgot to pull it off and painted on it? got any more pictures?

That was a pic with the masking paper still taped on the car. 5FistsoftheNorthStar04-18-2007, 10:49 AMExcuse the inappropriate question, but are you a girl? Thats pretty amazing...work and dedication into cars that I've seen done by a girl. reflexx04-18-2007, 04:21 PMno, but my wife is :) it started out as her car.... she's done all the bodywork, paint, upholstery, and about 30% of the mechanical work on the car. That's why it started out as purple - she loves purple! But then i didn't want to drive it around like that so we had to both agree on a color that works for us both... PearlJammzz04-18-2007, 04:35 PMMaybe I am just talking out my ass, but thisi s how it all makes sense for me.

Most of your engine bay cooling come from the side vents, and from under the car, and comes out up top. Now if you have air being pushed into the engine bay on top, the 2 jets of air are going to hit into eachother, causing eddies of sort (water does this, as I think air as well) and so the air ends up staying in there longer, and not just going in, over the components, then out. I know this is how it works in computer cases, and I've had crazy ammounts of work in that dept :).

By this theory, the engine-lid fans would work GREAT, and actually help a lot, but the scoops would actually hinder cooling performance. Now if you were to take the driver's side scoop, and somehow rig it to be part of the air box, or onto a cone filter, then the air would be a true ram-air design and not get all into the engine bay and cause problems. The passenger's side scoop however would serve no purpose but to hinder cooling performance and for looks. If you were to close the scoop off so it didn't let air in, then you'd get rid of the negative.

Just a thought...please correct me if you have any reason why this would not be true. reflexx04-18-2007, 06:13 PMlike i said above i'm not trying to cool the _engine bay_, i have specific fluid radiators positioned at the ends of the scoops, that's what i want air passing over, i don't really care where it goes after that. you dont need to inject air into the engine bay to cool the engine, that's what the radiator/liquid cooling system is for. i don't know about other people but i'm using each air entry (side scoops, top scoops) to stick oil coolers and other junk... DarkMousy04-25-2007, 10:39 PMThat sounds awesome providing that the air leaving each specific fluid radiator had an exit that didn't interfere too much with air leaving the other fluid radiators. runabout9306-22-2007, 11:37 AMI think those scoops were intended for cold air into your cold air intakes. Which is so minimal, they are useless. So, really this is a bling add-on to the MR2.

If you are thinking they are for something other than cosmetic, then think again. Here is what is happening to the air coming through these. It is going to pass into the engine bay across the top of the engine lid for a fraction of a second and then the hot air is going to take it right out the top of the engine lid vents.

Which brings me to another point. The real problem is with the engine lid vent... it doesnt allow enough of the hot air to escape. So this causes hot air recirulation around the engine. It's not hard to test this.. just open your engine lid and feel the sudden realease of hot air rush out. That hot air was trapped. So, in conclusion, increasing the amount of air to escape from the engine lid is the best thing you can do. Bigger vents or spal fans is the only way to go. That will allow more cold air from under the car to be foced into the engine bay.

In addtion, very little (if any) air is cooling the engine from the side vents. Those are used for the cold air intake on the driver side and the other side is for cooling the charge (for turbo models). On the na model.. the passenger side vents are probably useless until someone adds something like an oil cooler to it with a spal fan.

The bottom line is... your radiator/cooling system is keeping your engine from burning up. Cold air is a minimal part of it. canadam06-22-2007, 01:58 PMRunabout93-

Only the driver's side scoop can be made functional in the right application. The scoop was designed by Tom's racing to be used with a specific airbox for the 3SGTE.

The reason you find hot air rushing out when you open the engine lid is because there is no circulation when the car is at a standstill. When it's moving, a low pressure zone is created behind the rear window, pulling the hot air out like a vacuum. It's more than just hot air rising. Some people believe that a big Spal fan will only help when the car is at a standstill, but is actually restrictive when the car is moving enough to creat the low pressure zone. I have never seen actual numbers to prove this, but it wouldn't be hard to test with an electric thermometer to measure the ambient engine bay temperature. sleepermr206-22-2007, 05:31 PMdo you know where we can find the toms scoops and the specific air box? canadam06-22-2007, 05:40 PMThe genuine Tom's scoop and air box is very hard to find. Your best bet would be to import used parts from Japan. Regardless, the airbox will only work if you have a 3SGE in your car, which no American MR2s did. karl06-23-2007, 03:14 PMThe bottom line is... your radiator/cooling system is keeping your engine from burning up. Cold air is a minimal part of it.

while it's true that the cooling system is responsible for managing engine temperature, there ARE things in the engine bay that require airflow, such as the alternator, various sensors, etc. if air were kept stagnant in the engine bay, we would be seeing wiring and hose failures very often. heat buildup IS a potential problem despite the liquid cooling system. runabout9306-25-2007, 12:49 PMwhile it's true that the cooling system is responsible for managing engine temperature, there ARE things in the engine bay that require airflow, such as the alternator, various sensors, etc. if air were kept stagnant in the engine bay, we would be seeing wiring and hose failures very often. heat buildup IS a potential problem despite the liquid cooling system.

I never said airflow wasn't necessary. I said it was "minimal".

I still think spending time and money on roof scoops to get air in is a waste of time. Because the air coming though the scoops is going to be directed right out the top of the engine lid Scoops look cool (to some people anyway), other than that, they are useless.

I'll say it again... The greatest place to increase airflow into the engine bay will be from underneath the car and up through the engine lid vents. And I dont think you can increase anymore air into the engine bay until the size of the engline lid vents are increased. That's where money is better spent. Kurdain06-25-2007, 01:22 PMRMG makes good scoops and their fitment is great.

http://www.revision6.com/forms/Product.aspx?ID=306

Let me know if you are interested... runabout9306-25-2007, 04:41 PMRMG makes good scoops and their fitment is great.

http://www.revision6.com/forms/Product.aspx?ID=306

Let me know if you are interested...

Are those sticking off the roof on one side? I would think those would cause drag sticking up like that. bcrdukes04-19-2008, 10:27 AMrunabout93 is right and nailed it bang-on. The real and original Tom's intake and scoop was never designed for the 3S-GTE, only the 5S-FE/3S-GE and 3S-GE BEAMS models. Take a look at it here (http://www.imoc.co.uk/forums/viewtopic.php?p=809859&sid=b06679d292d00ad7397cd802d195bbc3) DucatiDave04-24-2008, 10:30 AMI have the bomex scoops mounted on both sides of the car...see picture...and WITHOUT A DOUBT...made the car run cooler...the way I could tell, was that before I put the scoops on...heat would radiate thru the seat and make my back sweat like a whore in church...after the install, no heat what-so-ever came thru from the engine bay...

And less heat around the motor or in the motor compartment will increase your compression ratio...basic thermal physics tell you that the cooler the motor the better it runs....to a degree...
BIG difference...

I also have a set of Toms...to each their own. I will post all of these for sale with-in a week in the for sale section...

Bomex:
http://img2.putfile.com/main/4/11404095717.jpg

http://img2.putfile.com/main/4/11404095681.jpg sickof5sfe04-24-2008, 10:38 AMI got mine not for the purpose of cooling the engine because for the most part the heat is towards the bottom of the engine anyways so cooling isnt a factor...BUT I also made my own Airbox and redid the intake piping to create what I believe is an effective system...It will draw in direct air from outside the car faster than the side vents because it can actually catch it. This colder intake air will also improve performance...however this will not create a dramatic power increase because the air can only be sucked into the intake manifold and not forced in...and it is only sucked in when the manifold vacuum is highest. Unless air is forced in with a turbo the most you can really do is cool the entering air and MAYBE increase its velocity slightly. But an actual box is very important if you plan on using a scoop as a slight performance increase. DucatiDave04-24-2008, 10:39 AMJust so you can see the difference...here is a pic I found on this site of a set of toms installed on a project car...not my car...

http://mr2.zhutiblog.com/com/forums/attachments/mk-2-cars/4610d1203981659-MR2-tw-fs-incomplete-91-t-project-004.jpg DucatiDave04-24-2008, 10:49 AMI modified my airflow in the engine compartment in such a way that I have a little control of it...I have two 10 inch fans that blow up through the lid when I turn them on to vent heat if the car sits for too long.

For Positive inflow to the compartment I have two small stock turbo fans that blow in from the sideskirt vents all the time...those combined with the air pressure created from the scoops...(which channels the air towards the filter instead of just dumping the air to the compartment...important note: pointed at filter NOT connected to filter)...bc someone can build a direct air ram-air type thing from the bottom of the scoop to the intake, but I would not suggest it...it is hard to tune a car that has direct ram air...plus...water in the intake is a deal breaker... Powered by vBulletin® Version 4.2.5 Copyright © 2026 vBulletin Solutions Inc. All rights reserved.