a2a OR w2a

[BVM]

Re: a2a OR w2a

" water can absorb some four times more energy than air"

lets say I am driving 40mph, the amount air hitting the a2a would be 4 times the water voume in w2a, now wouldn't you say they even each other out?

No.That same air is flowing through the heat exchanger for the W2A. Since water has a higher specific heat value it can dissipate heat more effectively. So when moving, W2A will still be 4x more efficient than an A2A. If you want to help an A2A system, you need to fit an intercooler water spray system like the Mitsu EVO and Subaru STi have as standard.

 

[denny]

Re: a2a OR w2a

No.That same air is flowing through the heat exchanger for the W2A. Since water has a higher specific heat value it can dissipate heat more effectively. So when moving, W2A will still be 4x more efficient than an A2A. If you want to help an A2A system, you need to fit an intercooler water spray system like the Mitsu EVO and Subaru STi have as standard.

yes, but how long would it take to get all the water in the heat echanger into the W2A?
Aren't you only getting a fraction of the cooled water into the W2A while on the A2A all the cool air are directly on the A2A?

 

[BVM]

Re: a2a OR w2a

yes, but how long would it take to get all the water in the heat echanger into the W2A?
Aren't you only getting a fraction of the cooled water into the W2A while on the A2A all the cool air are directly on the A2A?

I dont understand your first question.

No on your second question. Since water is more efficient, you can actually get away with using a smaller heat exchanger. This is a good thing when space is tight. If you have the room I suggest using the biggest heat exchanger you can get into the air-stream. Also, you want to guide the air through it (be it a radiator, heat exchanger or FMIC) since the incoming air will take the path of least resistance. The more air passing through, the more it will dissipate the charge temps.
If you take my advice and stuff the biggest heat exchanger you can in there, not only do you gain more surface area, you gain more capacity. That way it would take far longer for the system to get overwhelmed aka heat soaked. As soon as you come in for a cool down, the liquid will dissipate the heat faster than radiant heat transfer off a typical A2A core.
The only thing you have to consider is the main intercooler itself. One must know the maximum airflow the stock unit can handle. Once that becomes the limiting factor, it would then be wise to look in to FMIC's or a larger W2A intercooler. All things considered, CFM to CFM W2A will generally perform better than FMIC's in most applications.

 

[sy2675]

Re: a2a OR w2a

opcorn2:

 

[blk00z28]

Re: a2a OR w2a

I dont know about you guys, but even with my fan's on all the time, and a upgraded pump and lower. During the summer months here in florida when the temps are in the high 90's. My intake temps when driving in stop and go traffic are in the mid 140 range. That is not what I call good by any means. When I get moving again, it takes for ever for the temps to come down ore then 10-15 degrees.

Sure, some nights when its cool. (like right now) it'll be under 100 degrees. But in the summer. Hell, I'd think once I start moving with A2A, those temps would drop like a rock. Yes/No?

 

[BVM]

Re: a2a OR w2a

I dont know about you guys, but even with my fan's on all the time, and a upgraded pump and lower. During the summer months here in florida when the temps are in the high 90's. My intake temps when driving in stop and go traffic are in the mid 140 range. That is not what I call good by any means. When I get moving again, it takes for ever for the temps to come down ore then 10-15 degrees.

Sure, some nights when its cool. (like right now) it'll be under 100 degrees. But in the summer. Hell, I'd think once I start moving with A2A, those temps would drop like a rock. Yes/No?

A2A would be worse. I have data-logged my WRX with its FMIC set up. I have seen IAT's triple in stop and go traffic. Once on the move I don't recall IAT's below ambient. With W2A you should get lower than ambient. :tup:

 

[Flyin Ryan]

Re: a2a OR w2a

I dont know about you guys, but even with my fan's on all the time, and a upgraded pump and lower. During the summer months here in florida when the temps are in the high 90's. My intake temps when driving in stop and go traffic are in the mid 140 range. That is not what I call good by any means. When I get moving again, it takes for ever for the temps to come down ore then 10-15 degrees.

I would have to agree with you although my temps don't reach/stay as high as 140, more like 120's.. I also would say that there's not doubt that the upper ic heat soaks easly from the dp etc and because of this I'd go air2air on my truck especially since it's driven almost daily, raced on the street alot and hardly ever see's the track.

 

[blk00z28]

Re: a2a OR w2a

Well I guess the main question is this. Who has fans on their A2A, and who doesnt. What are you temp's like?

Because if I go A2A, its probably going where the lower is. And I'll probably be running the same fan's that are on it. For stop and go. Do you have fan's on your WRX BMV for this or no?

 

[James Thomas]

Re: a2a OR w2a

I dont know about you guys, but even with my fan's on all the time, and a upgraded pump and lower. During the summer months here in florida when the temps are in the high 90's. My intake temps when driving in stop and go traffic are in the mid 140 range. That is not what I call good by any means. When I get moving again, it takes for ever for the temps to come down ore then 10-15 degrees.

Sure, some nights when its cool. (like right now) it'll be under 100 degrees. But in the summer. Hell, I'd think once I start moving with A2A, those temps would drop like a rock. Yes/No?

Sounds like you may have other issues. Check everything, clogged / corroded upper or lower (internaly and external, debris in the fins of the lower), kinked hose (only takes one) or improper replaced hose size (I have seen 1/2 & 7/16!), bad voltage / ground connections for the pump, actual flow through the upper?

_________
James

 

[Black Knight]

Re: a2a OR w2a

Or maybe even look into ceramic coating all your exhaust, mine will be out getting it done as soon as Jeff gets the D/P done!

 

[Maverick87]

Re: a2a OR w2a

Ok here is my take on this. For the first 3 years I had my sy it had the stock a2w system.

Year 1 it was stock for abut 4 months worked ok. Last part of that year I put the extra cooler in the grill and a bigger pump. Noticed "maybe" a 5 degree drop in iat.

Year 2 I added a chest in the bed. With it full of ice i could make 2 passes at the strip. During those passed the iat would hover about 10* below ambent.

Year 3 I got into the alki injection thing. With the chest in the bed and the alki spraying I could get the temps on a 95* day down to 50-55*

Year 4 I ditched the a2w for an a2a. With the a2a and alki I get the same 50-55* iat. Plus lost about 50#s

From my stand point you cant beat a2a (in a street setup)

And also they (iat's) wont fall as fast as you would think.

 

[Maverick87]

Re: a2a OR w2a

A2A would be worse. I have data-logged my WRX with its FMIC set up. I have seen IAT's triple in stop and go traffic. Once on the move I don't recall IAT's below ambient. With W2A you should get lower than ambient. :tup:

So your saying that with w2a you will get below ambient in a stop and go situation? I would like to live on the same planet that you do.:rotf:

 

[BVM]

Re: a2a OR w2a

Do you have fan's on your WRX BMV for this or no?

My FMIC sets flush with the bumper opening on the WRX so there is no need & no room for fan.
Here is a pic of the scooby's engine bay. If you look closely you will see I am a hard core believer in heat management. Things you can't see are phenolic intake gaskets and coolant header tank spacers. There is Thermo Tec on the cold side FMIC pipe, fuel lines, intake/MAF housing and the up-pipe and down-pipe are both DEI heat wrapped. The intake doesn't pick up engine bay air, it gets fresh air from behind the fog light housing (fog lights removed for air flow during events). I run a SMC progressive water injection kit. The turbo has a heat shield on the hot side... it all adds up!

anyone want me to put up a video of my scooby (when it was only 350hp) smoking Skylines and Cosworths???

Steven

 

[BVM]

Re: a2a OR w2a

So your saying that with w2a you will get below ambient in a stop and go situation? I would like to live on the same planet that you do.:rotf:

Before entering smartass mode, where did I state that in stop and go traffic a W2A or A2A would give below ambient temps? Thats just stupid. :roll:

 

[Maverick87]

Re: a2a OR w2a

A2A would be worse. I have data-logged my WRX with its FMIC set up. I have seen IAT's triple in stop and go traffic. Once on the move I don't recall IAT's below ambient. With W2A you should get lower than ambient. :tup:

And I quote you again. From what I am reading that is what you said. Read the last line of your statement. There was no change in text to anything other than stop and go driving. And yes you are stupid:roll:

 

[sy2675]

Re: a2a OR w2a

:redx:

and yes to the wrx vids

 

[sy2675]

Re: a2a OR w2a

A2A would be worse. I have data-logged my WRX with its FMIC set up. I have seen IAT's triple in stop and go traffic. Once on the move I don't recall IAT's below ambient. With W2A you should get lower than ambient. :tup:

Think this was where almost samrt ass stuff started. :lol:

 

[BVM]

Re: a2a OR w2a

And I quote you again. From what I am reading that is what you said. Read the last line of your statement. There was no change in text to anything other than stop and go driving. And yes you are stupid:roll:

Then you clearly misinterpreted what I was saying. I was responding to the previous question about the difference between stop and go IAT's. Maybe I could have been a little more clear. Though you'd have to know very little to think even with W2A IAT's would be below ambient in stop and go traffic. Though, IAT's would still be lower the A2A in the same situation. If you are all about A2A, good on ya. I do this for a living and have my own experience to draw upon.
Once you resort to name calling, you're just showing your ignorance. :tdown:

 

[BVM]

Re: a2a OR w2a

Think this was where almost samrt ass stuff started. :lol:

Key statement there...

Once on the move I don't recall IAT's below ambient. With W2A you should get lower than ambient.

OK?

 

[BVM]

Re: a2a OR w2a

:redx:

and yes to the wrx vids

Ask and you shall receive. *Note* I though I ran an 11.9 so I got a lil excited! In reality the WRX only ran 12.4 @ 110.

Click here to see Video