Cold pipe piping???

97singlecab

97singlecab

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Mar 12, 2008
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All twin setups that you see run the cold pipe from the compressor outlet on the low pressure to the compressor inlet on the high pressure. But what would happen if both compressor outlets came together and went into the intercooler and you had two air filters on it instead? Does the air from the low pressure have to go through the high pressure? Maybe i've been up to long thinking about random crap.
 
if I'm understanding your idea correctly, you wouldn't be compounding boost from your low pressure turbo with your high pressure turbo.
 
I realize it wouldn't be "compounding" the air. I'm just building all the piping for my twins and had the thought while I was mocking it all up. I'm just wondering how it would work doing it that way, i'm sure someone has tried it out.
 
I don't plan on doing this. Was just thinkin and been trying to understand compound turbo charging a little more. It would probably be pretty slow to spool if piped that way wouldn't it.
 
JWhite said:
how so
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Twins imply two turbos that are the same, like most twin children.

BMW did something like you are talking about with two different sized chargers, small one for low rpm operation, and the bigger one for higher rpm. Can't really say if it would be worth it or not. Would make a big single much more driveable with a small turbo to use most of the time. But then again, thats the purpose of compounding too, plus you get a lot more pressure capability.
 
Tate said:
Twins imply two turbos that are the same, like most twin children.

BMW did something like you are talking about with two different sized chargers, small one for low rpm operation, and the bigger one for higher rpm. Can't really say if it would be worth it or not. Would make a big single much more driveable with a small turbo to use most of the time. But then again, thats the purpose of compounding too, plus you get a lot more pressure capability.
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Thats basicly the way I was thinking it would work in my mind, just wasn't sure how to say it. Maybe its worth trying out just to see.
 
I think if one of the turbos is bigger and one is smaller, then the smaller one would spool up quicker and force some of the air out of the larger turbo. The air just trying to find the easiest way out.
 
I don't think it would push the air out of the larger turbo since it would still be spinning and pushing air also it just wouldn't be "boosting". And if it did just run the compressor outlet from the small turbo across the valve cover and directly into the intake, and leave the large turbo pushing throught the intercooler. What do you think?
 
I highly encourage you to build the setup you are talking about. That will help you understand the differences between setups. Will it work? No. But your fab skills will be better when you do your second setup. Keep us posted.
 
RonA said:
I highly encourage you to build the setup you are talking about. That will help you understand the differences between setups. Will it work? No. But your fab skills will be better when you do your second setup. Keep us posted.
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I pretty much figured it wouldn't work, was just wondering what your guys input was on it.
 
I'm afraid to say I tryed it. Just curios. I asked the same question. People told me it wouldn't work but couldn't tell me why. It will shove all the air out the big turbo inlet like 98 smokey stated. As you know Wyoming has long winters.
 
jcj said:
I'm afraid to say I tryed it. Just curios. I asked the same question. People told me it wouldn't work but couldn't tell me why. It will shove all the air out the big turbo inlet like 98 smokey stated. As you know Wyoming has long winters.
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Yes they do and not alot to do around here during these cold a$$ winters either. Cool to hear from someone who actually tried it thanks for the input man.
 
Not sure that no-one had an answer. Maybe they just didn't tell you.

EVERYONE should have to take a course involving fluid dynamics. Simply the difference in a high and low pressure field.
 
It would be the same as switching from series to parallel on a fire pump. Series is used for pressure. It takes the discharge from one impeller feeding it into the eye of the other impeller raising the pressure of the discharge of the second impeller. Parallel is used for volume when you want to use more than 70% of its rated discharge. When in series you combine the pressure of the two, in parallel you combine the volume.
Your PSI wont go up but CFM would be through the roof
 
On the generator drive volvo 16liter they did something like your describing except they had a flow divider in the exhaust that when boost got to a certain point it would divert all the flow to the big turbo instead of the small one. If memory serves me they had an hx60 over an hx82. First time I had seen a factory installed twin setup since cummins did it in the 80's.
 
biggy238 said:
Not sure that no-one had an answer. Maybe they just didn't tell you.

EVERYONE should have to take a course involving fluid dynamics. Simply the difference in a high and low pressure field.
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I do understand fluid dynamics somewhat. I'm no expert. I build headers for a living. I have a pretty firm grasp here and have been hired to help some very well known race teams in most facets of motor sports over the years. When you get down to the nut cutting a "book" desinged header will get you close. There is some power left on the table. I gotta try different stuff to prove me wrong. NHRA prostock is one of the most competitive deals going. They're constantly trying stuff. Some of it works some it dosen't Alot of is against anything any book is gonna tell you.
I had a pretty good feeling redoing the twin deal wouldn't work but wasn't sure. Now I am.
 
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