About subies' scoop

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dkstz

dkstz

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Brazil
São Paulo, SP, Brazil
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arten_v
I've been thinking... Subaru Impreza's scoop leads air in directly to the intercooler right?
If so, then on rainy days, if you speed up wouldn't that leads a great amount of water to the engine bay??

I might be talking bs, but.. it doesn't make sense to me if thats right.

thanks!
 
this may end the thread quickly if im right, but i think the water could be used to cool the intercooler more, then the rubber seal around the cooling surface of the intercooler and the hood iscolates the water and it falls down to the ground via a little rubber tubular thing. much like what happens to the rain water that is captured between the hood and the windsheild.
 
Owning one I can confirm that rain gives a little extra power. At least more than my (useless) waterspray :D
 
Rain would be better for cooling. As far as water on the engine, you'd have to look at the scoop and whats under the intercooler. I'm sure subaru has thought of rain though, so whatever happens is probably fine.
 
Max_DC
Owning one I can confirm that rain gives a little extra power. At least more than my (useless) waterspray :D
Click to expand...
That could be partly down to the fact that the air is a bit cooler when it rains.

The cooler, more dense air holds more oxygen. :D

While the rain on your intercooler will increase it's efficiency, I think it will be a combined effect.

Your car feels more powerful on a cold, winter night than on a warm, summer day?
 
ferrari_chris
That could be partly down to the fact that the air is a bit cooler when it rains.

The cooler, more dense air holds more oxygen. :D

While the rain on your intercooler will increase it's efficiency, I think it will be a combined effect.

Your car feels more powerful on a cold, winter night than on a warm, summer day?
Click to expand...

No, it's because the water cools the surface of the intercooler and thus the air inside... that's what it's there for, remember ;)
 
ferrari_chris
That could be partly down to the fact that the air is a bit cooler when it rains.

The cooler, more dense air holds more oxygen. :D

While the rain on your intercooler will increase it's efficiency, I think it will be a combined effect.

Your car feels more powerful on a cold, winter night than on a warm, summer day?
Click to expand...

last question first, hell yeah. It's like day and night. When it is really hot out there my car feels like running on 3 cylinders compared to a cold day. I'd say that there is a serious decrease of hp and torque. And I'm not talking about 10 hp.

Back to the rain thing, it is a combination of both, but of course a wet track also takes away some performace again, and in winter hp and torque might be max, but then you have the less optimal winter tires so...
 
Meh, I think there's a limit to how cold air gets before you stop gaining power and start losing it.

Believe me, the 4A-LC in my AE82 Nova DOES NOT like cold mornings. And, there's a heater tube that heats the intake air at startup on cold days. air that's TOO cold must not be good for an engine.
 
Jim Prower
Meh, I think there's a limit to how cold air gets before you stop gaining power and start losing it.

Believe me, the 4A-LC in my AE82 Nova DOES NOT like cold mornings. And, there's a heater tube that heats the intake air at startup on cold days. air that's TOO cold must not be good for an engine.
Click to expand...

Well I'm no mechanic or physican etc, but first of all we are talking about an intercooler and an intake...I least I think so since I don't know what a 4A-LC is.
And the fact that your car doesn't like cold mornings can have various reasons.
First of all the engine has to get warm before it runs properly and when it's colder it takes longer etc. But as soon as your car is running ... cold = great ;)
Take NOS. Afaik pretty much all it does is cooling the gas/air mix down. At least it is a factor, but again I'm no pro ...
 
Nitrous's main effect isthe fact that it's denser in oxygen than air, even cold air.

as for my car's engine, it's a caubeureted, N.A. Toyota I-4. and i suppose that, to a point, you're right..it does seem to perk up once warm, but i've heard that the ideal temperature for maximum horsepower is 60 degrees F
 
Max_DC
Well I'm no mechanic or physican etc, but first of all we are talking about an intercooler and an intake...I least I think so since I don't know what a 4A-LC is.
And the fact that your car doesn't like cold mornings can have various reasons.
First of all the engine has to get warm before it runs properly and when it's colder it takes longer etc. But as soon as your car is running ... cold = great ;)
Take NOS. Afaik pretty much all it does is cooling the gas/air mix down. At least it is a factor, but again I'm no pro ...
Click to expand...

so that means

colder is better... cool:)
 
Max_DC
Well I'm no mechanic or physican etc, but first of all we are talking about an intercooler and an intake...I least I think so since I don't know what a 4A-LC is.
And the fact that your car doesn't like cold mornings can have various reasons.
First of all the engine has to get warm before it runs properly and when it's colder it takes longer etc. But as soon as your car is running ... cold = great ;)
Take NOS. Afaik pretty much all it does is cooling the gas/air mix down. At least it is a factor, but again I'm no pro ...
Click to expand...

No, nitrous does not necessarily cool the air (which it might). Nitrous oxide (NO2) simply adds a looooot more oxygen to the combustion chambers. More oxygen=more combustion so tada, we have more power :)
 
Jim Prower
Nitrous's main effect isthe fact that it's denser in oxygen than air, even cold air.

as for my car's engine, it's a caubeureted, N.A. Toyota I-4. and i suppose that, to a point, you're right..it does seem to perk up once warm, but i've heard that the ideal temperature for maximum horsepower is 60 degrees F
Click to expand...

The engine needs to be warm (optimum temp) but the intake air is better cold (due to oxygen density), the cold air is not going to cool the engines overall temperature.
 

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