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Old 12-27-2015, 03:00 PM   #21
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Quote:
Originally Posted by patsmx5 View Post
A/C condenser in the trunk so it's not obstructing airflow and adding heat to the front heat exchangers.

Only pic I have of front end, but you can kind of see there is plenty of open area for air to go straight to the radiator.
If the condenser is in the trunk, where does the rear mounted turbo go?
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Old 12-27-2015, 03:04 PM   #22
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If the condenser is in the trunk, where does the rear mounted turbo go?
I don't know what your talking about...
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Old 12-27-2015, 07:15 PM   #23
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Originally Posted by Savington View Post
Fab9 welds tabs onto Vibrant ICs.

Sealing the IC to the mouth is just about the worst thing you can do for airflow. Most intercooler setups I see do it this way, and it's 100% wrong. BTDT. Radiator needs fresh air, and the only way to do that is to make the IC shorter (and fatter to maintain flow rate), then use a core design with turbulators (i.e. not Vibrant or anything from eBay) to improve efficiency and maintain low IATs with the smaller core. The painful realization is that nobody makes an intercooler that's correctly dimensioned for this application, yet. Ours will be.
My intercooler basically sits sealed to the bottom joggle in the factory mouth piece duct. there is about a 3" gap between the intercooler and the factory chassis crash bar for air to flow up and over the top of it into the area sealed to the radiator. I run one fan and an oil cooler sitting slanted between the bottom of the radiator and the steering rack is fed air from hose ducts run from holes in the lip spoiler. It may not be a perfect setup but it seems to be effective.

You need ambient air flow through the intercooler which requires a pressure differential it wont work for **** if you just stick it in a plenum area without forcing flow through it.
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Old 12-27-2015, 08:18 PM   #24
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Quote:
Originally Posted by Alternative View Post
What everyone is accomplishing by this is a pressure differential, to have ANY airflow you need a pressure differential. If you allow higher pressure air around the intercooler you will have little/no airflow through the intercooler.
What they're accomplishing is zero radiator airflow and the most efficient way to overheat an internal combustion engine ever devised by man.

Quote:
Originally Posted by patsmx5 View Post
the car would overheat under any real load
Yep. I tried this, I've never had a car overheat so fast.



This setup let my 350whp track car run 20min sessions at <215*F in 105*F heat. IATs were ~30*F above ambient. There are two sealed chambers behind the IC, one ducted to the top of the rad (fed by the upper mouth duct) and one ducted to the bottom of the rad (fed by the lower mouth duct). I suspect I could have dropped IATs a bit more by venting the IC under the radiator.



Quote:
Originally Posted by bbundy View Post
My intercooler basically sits sealed to the bottom joggle in the factory mouth piece duct. there is about a 3" gap between the intercooler and the factory chassis crash bar for air to flow up and over the top of it into the area sealed to the radiator.
The gap is critical. I'm starting to see IC setups that are sealed to the crash bar, and once you do that, nothing will prevent overheating.

Quote:
You need ambient air flow through the intercooler which requires a pressure differential it wont work for **** if you just stick it in a plenum area without forcing flow through it.
You understimate the ability of 100mph worth of airflow blowing directly onto the face of a heat exchanger to create a pressure differential without too much regard to what's sitting behind/above/around that heat exchanger.
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Old 12-27-2015, 09:39 PM   #25
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having a fair bit of experience 'fixing' track car cooling systems for people, I wholeheartedly agree with Sav.
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Old 12-28-2015, 12:44 AM   #26
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Quote:
Originally Posted by Savington View Post
Fab9 welds tabs onto Vibrant ICs.

Sealing the IC to the mouth is just about the worst thing you can do for airflow. Most intercooler setups I see do it this way, and it's 100% wrong. BTDT. Radiator needs fresh air, and the only way to do that is to make the IC shorter (and fatter to maintain flow rate), then use a core design with turbulators (i.e. not Vibrant or anything from eBay) to improve efficiency and maintain low IATs with the smaller core. The painful realization is that nobody makes an intercooler that's correctly dimensioned for this application, yet. Ours will be.
agreed for the most part.
the 1st bolded part is simply not true, since many of us have found 1 specific brand from ebay that actually has properly placed and spaced turbulators.
the 2nd bolded part is a very bold statement, I can't wait to see if it holds true (because I can think of at least 2 sizes currently available that are, IMHO)
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Old 12-28-2015, 08:45 AM   #27
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this one was quite large.



His AIT's would never break ambient on a 1/4 mile track.


Quote:
Most of my searches have only led to small ebay cores, or just small cores in general neither i am interested in running. I just need sizes as i will most likely end up buying one of the many options through treadstone or someone else with a good rep for a solid intercooler.
why do you care about such a large core? building a drift car?
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Old 12-28-2015, 10:41 AM   #28
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he's building a highway pullz bro car

2jz and nas
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Old 12-28-2015, 11:26 AM   #29
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putting together a 2jz miata, can't use measuring tape.
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Old 12-28-2015, 04:11 PM   #30
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Quote:
Originally Posted by Braineack View Post
putting together a 2jz miata, can't use measuring tape.
I want a good starting spot so i can purchase a core and cut things to make it fit.

In classic turbo miata fashion a simple question had a couple helpful answers..and then went down hill from there . Back to googling to find info vs asking for helpful advice from people with experience on that subject.
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Old 12-28-2015, 04:20 PM   #31
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Quote:
Originally Posted by Shortpersonbk View Post
I want a good starting spot so i can purchase a core and cut things to make it fit.

In classic turbo miata fashion a simple question had a couple helpful answers..and then went down hill from there . Back to googling to find info vs asking for helpful advice from people with experience on that subject.
In all fairness, there's probably 10 good post in this thread already. Maybe only 2 or 3 answer the exact question you asked, but still it's a 9/10 compared to what it could have been here. Better still, most of those extra post that were useful were people who go fast with real world experience posting their experience, not BS.
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Old 12-28-2015, 04:22 PM   #32
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Originally Posted by patsmx5 View Post
In all fairness, there's probably 10 good post in this thread already. Maybe only 2 or 3 answer the exact question you asked, but still it's a 9/10 compared to what it could have been here. Better still, most of those extra post that were useful were people who go fast with real world experience posting their experience, not BS.
I agree there was some helpful post, enough that it helped me decide which core i am going to purchase and try out.

Yours were included in the helpful post of course. I am going to buy a treadstone of similar size to yours.
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Old 12-29-2015, 09:56 PM   #33
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Selecting a core size has several considerations.
Cooling air to the rad.
length of tubes
thickness of core
end tank shapes
internal flow area

Tube length: 12" is about 80% efficient, 22" approaches 92/93%, 25" is excess dead weight.
Thickness: The thicker it gets the lower the efficiency. The back half of the core gets nothing but hot air. Suggest 3.5 to 4.0 is about optimum.

Tank shapes are very important for low flow losses. Streamline, streamline, streamline..

Internal flow area controls (in major part) the flow loss. Look at Bellintercoolers.com for some guide lines.

Longer tubes have more drag, keep in mind

In my experience, keep the core thickness under 4.0, tubes over 18" and flow area to match BIC suggestions.

Almost everything else become dead weight

Consider that an 18" tube can offer about 90+ thermal efficiency, then what would a core do that is twice as long? maybe 6% better, twice the cost, more drag and heavy.

Keep it within reason. There are many good cores available, but not all are created equal. Quite hard to easily distinguish. Density of turbulators is one tip. The more the better.

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