Dual stock intercoolers

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suprarich

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He just wanted to know if it would work, not whether it was eaiser to just do an aftermarket. I think he has the answer. Run in parallel would work well, but would be a plumbing nightmare. Even if all the angles and lengths are not exact, it should still flow better than running in series. Even if one does 60% of the work and the other does 40%. How about a boost activated diverter valve to open the path for the second intercooler at a certain boost level. This would save some lag at lower boost levels when trying to fill all that volume. I am sure we can make this even more complicated.
 

Nick M

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I think it should be pointed out that two intercoolers is making 3 left turns to go right.

The stocker has huge pressure drops. This was validated before some of you were even driving. With a better turbocharger, it isn't needed as much, and you can get away with the shittier piece.
 

JohnRardin

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Why would you go to the trouble of having parallell IC piping from the turbo? That would be an extreme amount of unneeded work that would just add lag. All I plan on doing is removing about 6" of the piping on the inlet and outlet of the IC, and adding 2 PVC Y-pipes for the second IC. It should only be about 6" away from the other IC. I can't seem to see the logic of how it wouldn't flow better....Id say itd flow exactly twice as much....right? It should also have half the pressure drop as well. As far as I see it the only downfall would be the added space that air must travel through. Right?
 

Whasian

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I want do that mod myself. I am working on getting some couplings so that I can put the other intercooler in. I have seen that mod before and I think doing the mod will help a lot.

Whasian
 

Nick M

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Whasian said:
I want do that mod myself. I have seen that mod before and I think doing the mod will help a lot.

Whasian

How do you figure it will help? Adding a second bad intercooler is not an improvement, and you are adding weight and taking up space.

Turbo Magazine said:
The factory intercooler leaves little to be desired with regards to both pressure drop and cooling effectiveness. When we ran our first dyno tests on the Supra (TURBO Jan '87) we thought the restriction at higher boost pressures was actually in the turbo, but in conferring with Cartech, Spearco and HKS it was found that the stock intercooler itself was a major contributor to the problem. Testing at Cartech showed the stock intercooler to have a 3 psi pressure drop a 6.8 psi and a whopping 4.3 psi pressure drop at 9 psi. In other words, the turbo had to do the same work and therefore, produce heat as if it was run at 13.3 pounds of boost, while the engine itself was only seeing 9 pounds of boost.
All of these intercoolers are similar in size except that the Spearco unit also employs slightly larger diameter tubing in some locations going to and from the intercooler.
The only intercooler we were able do to an actual before and after test with on our own car were one of the units from Cartech. At stock boost pressure we found an 11-horsepower gain between the stock and Cartech intercooler. While this gain was actually measured at the stock (8 psi w/exhaust) boost pressure, it should be noted that intercooler efficiencies are best tested in a real world or street environment with actual air flow across the core. Previous testing on the Cartech intercooler showed a 7/10 psi drop at 6.8 psi and 1.10 psi at 14 psi which basically agreed with our dyno runs. In addition to actual pressure drop, Cartech testing of the intercooler showed 89% efficiency vs. 68% on the factory unit[Cartech uses a Spearco core, as most domestic aftermarket units do]. With the similarity in intercooler upgrades, it would be safe to say that any one of these would be an almost mandatory option if you are starting to go for serious boost.
Now if you have a better turbo that moves more air with less heat, the intercooler is not as much of an issue. As already pointed out. I just want you to have all the information available.
 
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OneJoeZee

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lintlars said:
I was looking for that but could not remember where I saw that info good post Nick! maybe we can put this to rest now.

I don't think it's really put anything to rest... People who want to insist on being a cheapass and using 2 stock ICs instead of a single better aftermarket will probably still do it anyway just to be cheap and save a few pennies.
 

Whasian

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Nick M said:
How do you figure it will help? Adding a second bad intercooler is not an improvement, and you are adding weight and taking up space.


Now if you have a better turbo that moves more air with less heat, the intercooler is not as much of an issue. As already pointed out. I just want you to have all the information available.

That's great you found that information, thanks. But that article is so biase that you almost can't use it when it comes to doing modifications to your supra. They are basing that article on a "STOCK" 7m while the other "AFTERMARKET" intercoolers are used with mods... Plus they talk about the intercooler losing 3 psi @ 6 psi. The way the article sound, you only get three pounds out of it when that it totally untrue, I get a very accurate 6.7psi with my stock cooler. And at the "WOOPING" 9psi that the car gets you lose 4psi through the cooler. That isn't that bad when you think about the fact that if you lose 3psi @ 6 you are averaging about 1lb to every 2 that you get... At 9lbs you are losing less than that right?(simple math).

Don't get me wrong, the aftermarket coolers are better hands down. They are made of a different material than the stock one. So they cooler better, but let's think about this, what would adding an intercooler spray kit do to the stock cooler, (It seem obviuos to me that it would naturally cool it down) So what is the harm in using the cooler, nothing I say especially if you are only trying to hit between 400 and 500 hp.

I thought I would throw that out there since we are just posting information.

Whasian
 

Whasian

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OneJoeZee said:
I don't think it's really put anything to rest... People who want to insist on being a cheapass and using 2 stock ICs instead of a single better aftermarket will probably still do it anyway just to be cheap and save a few pennies.


Maybe you should find another forum to post you ignorant claims on, it's not always about being cheap when it comes to modifying a car. It's about finding new ways to get something to work better... How do you think people found out they could use mk4 brake calipers on thier cars, or were about to using different sensors from other cars, or (how about this one since you have a 1j) people who use the timing belt off an '88 and up isuzu rodeo for thier 1j. Ever think about that?

So don't think it's always about being cheap. It's about what a person can come up with to make thier car better and in doing so, keeps the idea they have a unqiue and custom part.

Whasian
 

IJ.

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Any way you look at it anytime you add a bend you're increasing restriction and losing pressure at the cylinder so you lose power.......

Why build an inefficient system to save a few $ when e-bay coolers are so cheap and available?
 

OneJoeZee

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Whasian said:
Maybe you should find another forum to post you ignorant claims on, it's not always about being cheap when it comes to modifying a car. It's about finding new ways to get something to work better... How do you think people found out they could use mk4 brake calipers on thier cars, or were about to using different sensors from other cars, or (how about this one since you have a 1j) people who use the timing belt off an '88 and up isuzu rodeo for thier 1j. Ever think about that?

So don't think it's always about being cheap. It's about what a person can come up with to make thier car better and in doing so, keeps the idea they have a unqiue and custom part.

Whasian


You think using 2 stock intercoolers is better than using a single more efficient aftermarket intercooler?

Why would you use 2 stock ICs other than to save money?
 

Whasian

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OneJoeZee said:
You think using 2 stock intercoolers is better than using a single more efficient aftermarket intercooler?

Why would you use 2 stock ICs other than to save money?

Did you forget to read the last paragraph that I wrote? You must have...

Whasian
 

OneJoeZee

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Whasian said:
That's great you found that information, thanks. But that article is so biase that you almost can't use it when it comes to doing modifications to your supra. They are basing that article on a "STOCK" 7m while the other "AFTERMARKET" intercoolers are used with mods... Plus they talk about the intercooler losing 3 psi @ 6 psi. The way the article sound, you only get three pounds out of it when that it totally untrue, I get a very accurate 6.7psi with my stock cooler. And at the "WOOPING" 9psi that the car gets you lose 4psi through the cooler. That isn't that bad when you think about the fact that if you lose 3psi @ 6 you are averaging about 1lb to every 2 that you get... At 9lbs you are losing less than that right?(simple math).

Read it again. If you are using a stock IC and seeing 6psi at the manifold, 3psi drop means your turbo is working harder making 9psi just so you can see 6psi at the manifold.
 
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