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Old 01-24-2012, 01:33 PM   #1
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Default Boost PSI hoses

Setting up an EBC and running lines. Noticed a couple hoses were going to the wrong place. Can anyone give me some advice on the matter.

"Correct" way to run lines.


The way it is setup now. notice the red boost line.



How bad is this. FWIW it ran fine and dyno'd properly making good power.

Thank you for your advice.
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Old 01-24-2012, 01:40 PM   #2
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The way it is setup now. notice the red boost line.
This is not necessarily "wrong", and in fact, this method is discussed by Corky in Maximum Boost.

Essentially, the configuration you have is going to cause the wastegate to be fully closed all the time. With the port placed just before the throttle plate, the wastegate valve would be open any time operating conditions are just right to allow the turbo enough exhaust flow to be making a significant quantity of boost and yet the throttle plate is sufficiently closed to cause MAP to be below the boost target. This sort of over-works the turbo, and produces a lot of heat.

This operating condition is not particularly common in normal driving. You'd have to be doing something like climbing a hill under part-throttle, giving the engine enough load to spin up the turbo and make boost, and then modulating it with the throttle.

If it concerns you, feel free to move the hose to a point in the system between the intercooler and the throttle body.
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Old 01-24-2012, 02:29 PM   #3
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What is this "maximum boost" you speak of?

I understand what the setup is doing right now. I guess my question is, if I leave it, how bad is it on the system components? Would you recomend changing it to the "correct" way. FWIW this is a weekend warrior car. Not daily driven. And does see some track time.
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Old 01-24-2012, 02:35 PM   #4
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its fine as in.
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Old 01-24-2012, 02:39 PM   #5
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Quote:
Originally Posted by Hella_Rare_Yellow View Post
What is this "maximum boost" you speak of?

I understand what the setup is doing right now. I guess my question is, if I leave it, how bad is it on the system components? Would you recomend changing it to the "correct" way. FWIW this is a weekend warrior car. Not daily driven. And does see some track time.
A book.
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Old 01-24-2012, 03:00 PM   #6
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Sorry. Double post.
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Old 01-24-2012, 03:05 PM   #7
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A book.
It is actually THE BOOK about turbo charging.
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Old 01-24-2012, 03:11 PM   #8
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It is actually THE BOOK about turbo charging for n00bs.
fixed.

Quote:
For example, suppose a turbo has a compressor discharge temperature of 200F above atmospheric temperature, that is, about 740F absolute on an 80F day. (Zero degrees abso­lute is about 460F; add 80F to get 540F; 200F above that temperature is, there­fore, 740F absolute.) If we insert a 60% efficient intercooler into the system, we would remove 0,6 x200F = 120F from the system, leaving a gain of just 80F rather than 200F or an absolute of 540+80 = 620.
you need a bit of a brain when reading it. But there are a lot of pictures.

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Old 01-24-2012, 03:19 PM   #9
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I acutally find the book quite technical...
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Old 01-25-2012, 03:34 AM   #10
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its a must buy! Really good information for anyone that feels awkward around turbos.
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Old 01-25-2012, 03:51 AM   #11
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Originally Posted by Braineack View Post
I acutally find the book quite technical...
"Turbochargers" is quite a bit more technical

The NACA documents from around WWII (before they got stuck on jet turbines) are where its at.
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