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Discussion Starter #1
ok as some of you know i am good at making hp numbers out of N/A motors and now i am going to learn about F/I mainly turbocharged motors...so i am new to some of this turbo stuff
so my question is what characteristics of a turbo determines how much boost it can produce and how much abuse it can take..also what determines how much boost a turbo can make before coming inefficient like when people say after a certain amount of boost the turbo is just blowing hot air into the engine...
the reason i ask is becasue i was talking to my friend about his wrx that he has modded but still uses the stock turbo..he told me that basically the stock wrx turbo can only put out about 16 or 17psi max and then after that it is just blowing hot air into the engine...what makes this happen and also wouldnt just a bigger better intercooler help this problem a little bit therefore making it possible to run higher boost out of the stock turbo efficiently as long as it can take it without killing the turbo...
any info would be helpful ...i also did a search and found nothing that could help me

thanx in advance
anthony
 

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Discussion Starter #3
ok

well i have already benn there and read all they had on turboes..but it didnt help explain how turboes get inneficient after certain boost levels on certain turboes...
also i want to know what my freind meant when he said it just blows hot air into the engine if he turns the boost up too high...
can anyone give me more info on this

thanx
anthony
 

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the clever guy
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Go to a bookstore and look in the automotive section. You should be able to find a couple good books that have some in-depth explanation without going too deep to the point of needing to be a physicist to understand. HTH
 

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Get the book, Maximum Boost, written by Corkey Bell. GREAT book!
 

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Don't feel that you're the only one that doesn't understand. I am still trying to grasp the concept myself, but basically you have to spin a given sized compressor X speed to produce X amount of boost. To get more boost you have to spin the compressor faster. Spinning it faster generates more heat and the more you compress air the more it heats. A larger compressor will push more air at a slower shaft speed and the temperatures in the intake charge will be lower.

Or at least that is my understanding.
 

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i have been told, that a larger turbo also pushes more air. thats my my stock ct26 at 12 pis give me like 290 and my friends to4, at 12 psi is over 460 hp......
 

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Ckanderson said:
i have been told, that a larger turbo also pushes more air. thats my my stock ct26 at 12 pis give me like 290 and my friends to4, at 12 psi is over 460 hp......
a larger turbo pushes cooler and therefore denser air, which means more oxygen content per psi and more power.

adam
 

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but, adam, doesnt the intercooler take care of that? i know the intercooelr can make up the 180 hp differance, between me and my friend.......
 

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the clever guy
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Get the book, Maximum Boost, written by Corkey Bell. GREAT book!
Yeah, that's a good one. I brought it up about a year ago and there was some criticism. Unless you are a knowledge thirsty engineer with a Phd then it's perfect for an initial read. :cool:Last year
 
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