Bigger Charge pipe dia affect spool time?
01-27-2004, 06:12 PM
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Bigger Charge pipe dia affect spool time?
Im buyin turbo parts for my CRX, as I look at charge pipe setups I see people with CP sizes from 2in to 2.5in. I was wondering if there has an affect on spool time and possibly increase time before you hit full boost? I have also read about how people run smaller dia CPs to increase flow velocity to the tb, is there any truth to this? Im looking for some people who have made the switch and can or cant tell the difference, tia
Blaze
Blaze
01-27-2004, 06:45 PM
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Re: Bigger Charge pipe dia affect spool time? (Blaze45)
short answer : yes it will affect spool time and yes a smaller pipe will increase velocity
whether or not you will notice it, thats debateable
if you are really curious google terms such as bernoulli's theorm, incompressible convergent divergent, mass flow rate
whether or not you will notice it, thats debateable
if you are really curious google terms such as bernoulli's theorm, incompressible convergent divergent, mass flow rate
01-27-2004, 06:47 PM
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Re: Bigger Charge pipe dia affect spool time? (1.8T_EG)
Iv'e seen best results...............2in from compressor and 2.5 from ic to tb.
to small piping can be bad to big can be bad. go with what eeryone else is using, keep it simple. no need to be different for no reason.
to small piping can be bad to big can be bad. go with what eeryone else is using, keep it simple. no need to be different for no reason.
01-27-2004, 07:06 PM
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Re: Bigger Charge pipe dia affect spool time? (HybridcivicLS-T)
Im all about KISS, but I am curious on what people have tried and come up with. Thanks 1.8 EG for the seach stuff.
Blaze
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01-27-2004, 07:26 PM
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It won't make a difference you will notice.
At 3000 rpm on a 1.6l motor, you're filling 2400 liters per minute, or 40 liters per second. If you add another couple liters by switching to larger pipes, you're really not adding much volume.
At 3000 rpm on a 1.6l motor, you're filling 2400 liters per minute, or 40 liters per second. If you add another couple liters by switching to larger pipes, you're really not adding much volume.
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01-27-2004, 07:28 PM
#8
But are you really adding more volume? Sure you're increasing the volume inside the piping, but you're decreasing the gas velocity, thus moving LESS volume of air per unit time... I don't know, maybe you're right...I'm just trying to think this out. 
01-27-2004, 08:18 PM
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Re: (DaX)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DaX »</TD></TR><TR><TD CLASS="quote"> I don't know, maybe you're right...I'm just trying to think this out. </TD></TR></TABLE>
hehe please dont, cuz i just built 3" piping on my car
j/k
</TD></TR></TABLE>hehe please dont, cuz i just built 3" piping on my car
j/k
01-28-2004, 08:57 AM
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Re: (DaX)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DaX »</TD></TR><TR><TD CLASS="quote">But are you really adding more volume? Sure you're increasing the volume inside the piping, but you're decreasing the gas velocity, thus moving LESS volume of air per unit time... I don't know, maybe you're right...I'm just trying to think this out. </TD></TR></TABLE>
Umm... yes. Spool is the time it takes to pressurize the intake stuffs. Bigger stuffs = more volume = a little tiny meaningless bit of extra spool time.
Once you are at full boost, yes, the exhaust velocity will be slower. It will be slower, because the larger diameter means the airflow will be the same at a lower velocity.
What we're concerned with is spool time, which is before you're at full boost.
</TD></TR></TABLE>Umm... yes. Spool is the time it takes to pressurize the intake stuffs. Bigger stuffs = more volume = a little tiny meaningless bit of extra spool time.
Once you are at full boost, yes, the exhaust velocity will be slower. It will be slower, because the larger diameter means the airflow will be the same at a lower velocity.
What we're concerned with is spool time, which is before you're at full boost.
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