roof scoops

[canadam]

Runabout93-

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.

[sleepermr2]

do you know where we can find the toms scoops and the specific air box?

[canadam]

The 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.

[karl]

Originally Posted by runabout93

The 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.

[runabout93]

Originally Posted by karl

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.

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.

[Kurdain]

RMG makes good scoops and their fitment is great.

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

Let me know if you are interested...

[runabout93]

Originally Posted by Kurdain

RMG 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.

[bcrdukes]

runabout93 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

[DucatiDave]

I 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:

[sickof5sfe]

I 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.

[DucatiDave]

Just 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...

[DucatiDave]

I 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...