Rear Air Intake?

[a]

Anyone put an air intake funnel through the rear grill (air box side) and will it perform ok
or is it sucking dead/dirty air in that position?

[Carolyn]

Just wondering why?

[a]

Just wondering why?

Just wondering it will be cold clean air?

[StuC]

Stock one kinda does this anyway. Just a little further rearwards.

[Carolyn]

It would take a very expensive study to know.

[a]

Stock one kinda does this anyway. Just a little further rearwards.

External rear grill just adjacent to the number plate.

[shnazzle]

Stock intake is plenty cold and does all it needs to do.
Or enclosed cone filter behind battery (where the stock intake gets its "fresh" air from, fed by the side vent.

Stock intake = quiet, effective very good filtration with stock cotton panels.

Stock intake with aftermarket "Performance" panel = same as stock only worse filtration.

Open cone in stock location = noise, horrible heat soak and performance drop, bad filtration

Enclosed cone behind battery = noisiest, improved throttle response, worse filtration, coolest air, heatsoak when not moving

Take your pick

[Call the midlife!]

Have you ever sat behind another 2 at lights etc? The heat haze coming off the back end is ridiculous, the whole bumper area just radiates heat so I would imagine the air it's leaving behind would be considerably hotter than the air it's moving into.


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[a]

Everywhere under the bonnet seems hot though. I have a pipercross filter in the standard box which works well just thought
about this rear facing funnel to the ouside. I see what you mean though about the heat haze.

[Ardent]

A theme aross many threads tonight.
Stock is best.

[Petrus]

A theme aross many threads tonight.
Stock is best.

No discussion there ;-)

One thing though. Over here under the southern sun I am anticipating the august heat.
Is there any experience with extractor fans under the engine lid? The idea of being able to switch those on when stopped on 60 degree tarmac makes be happier 

[Carolyn]

A theme aross many threads tonight.
Stock is best.

No discussion there ;-)

One thing though. Over here under the southern sun I am anticipating the august heat.
Is there any experience with extractor fans under the engine lid? The idea of being able to switch those on when stopped on 60 degree tarmac makes be happier 

Like this?  This one is arranged to extract upwards as it's for keeping exhaust heat away from the supercharger, which sits under the manifold.  With the conventional set-up, it might do better blowing down....

[Petrus]

Yes, like that. Exactly. Thanks.

I have already removed the drip tray as we have 300 days of sun/year ánd it lives under a car port.

Because there now indeed already ís a ´draft´ upwards (phew...), I would prefer to not go against that natural flow and have the fan suck upwards.
With the metal tray gone, two mounting strips from the tray mounting points would be needed. Quite straighforward.

[1979scotte]

Yes, like that. Exactly. Thanks.

I have already removed the drip tray as we have 300 days of sun/year ánd it lives under a car port.

Because there now indeed already ís a ´draft´ upwards (phew...), I would prefer to not go against that natural flow and have the fan suck upwards.
With the metal tray gone, two mounting strips from the tray mounting points would be needed. Quite straighforward.

TTE made one for the turbo car's.
Headcase did a couple for those of us with turbos with mixed success the controller box melted on mine when the high temp glue gave up.
Would be fine on a stock engine even better if you didn't want it to be automatic and just had a switch in the cabin.

[a]

I have bought a fan ready to fit after my turbo installation. Any good thermostat switches out there
rather than a manual switch?

[Petrus]

and just had a switch in the cabin.

That´s the idea.

[1979scotte]

and just had a switch in the cabin.

That´s the idea.

Although on a stock car I would think it would be unnecessary.
Japan is a hot country and their engineers are pretty good.

[Petrus]

Although on a stock car I would think it would be unnecessary.
Japan is a hot country and their engineers are pretty good.

I agee, thus hope/trust that taking the tray out will be enough. Not fitting one for the moment. First thing is to try get a smaller front number plate approved. Nevertheless, still good practice to prepare for worst case shoúld it be necessary.

[Dev]

The MR-S design doesn't have a cooling issue. If you track it it might need an oil cooler but thats about it.

Adding a fan on the back side of the car is only going to cool the exhaust which is far hotter than anything you are going to dissipate. 

  People often think this car is hot under the hood because of its mid-engine design not getting enough cooling but that's not true as the explanation is very simple.   

On a front engine transverse car using a similar engine the exhaust manifold faces the fire wall and is shielded from the heat. In our configuration the exhaust bits are exposed and therefore the heat is apparent and of no concern as it doesn't cause any kind of damaging effects to the paint or components. It can be argued that the front of the engine against the firewall remains cooler than a front engine car because there is no radiant radiator heat in that area and it receives fresh air from the vents. 

When you add a fan, you are just adding more weight and complexity to the car that is not needed.

[Dev]

 In regards to intakes. Our car design has an advantage of utilizing  and aftermarket intake that is not only a short but also a cold air intake.
It just needs to extent behind the battery and you will have near ambient air entering the engine.
The reason why you will get near ambient temps is also the reason why we don't have the radiator in the rear of the engine compared to other configurations.

If you have the intake run to the back of the car then you will have a hot air long intake that is counterproductive.

[Ardent]

Although on a stock car I would think it would be unnecessary.
Japan is a hot country and their engineers are pretty good.

I agee, thus hope/trust that taking the tray out will be enough. Not fitting one for the moment. First thing is to try get a smaller front number plate approved. Nevertheless, still good practice to prepare for worst case shoúld it be necessary.

Any chance you would get away with a stick on number plate like mine.

[Petrus]

Any chance you would get away with a stick on number plate like mine.

Sadly not.