Intercooler questions
12-14-2005, 11:35 AM
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Intercooler questions
Ok ive been looking into making my own fmic piping and read/hearing alot of mixed thoughts on intercooler piping that i want to clear up.
1.) less piping = quicker spool
2.) 3" piping is to large for cars making less then 400whp
3.) sharp bends cause lag and or compressor surge
4.) most ideal location for BOV is within 6 inches of TB
5.) this is actually a part B to #2, but ive also noticed that most intercooler kits are like 2.25 from turbo to intercooler then become 3" as it meets the intercooler. then is 3" from intercooler to throttle body. supposedly this helps with throttle response
any care to answer these?
Modified by ferio 95 at 4:31 PM 12/14/2005
1.) less piping = quicker spool
2.) 3" piping is to large for cars making less then 400whp
3.) sharp bends cause lag and or compressor surge
4.) most ideal location for BOV is within 6 inches of TB
5.) this is actually a part B to #2, but ive also noticed that most intercooler kits are like 2.25 from turbo to intercooler then become 3" as it meets the intercooler. then is 3" from intercooler to throttle body. supposedly this helps with throttle response
any care to answer these?
Modified by ferio 95 at 4:31 PM 12/14/2005
12-14-2005, 11:54 AM
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Re: Intercooler questions (ferio 95)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ferio 95 »</TD></TR><TR><TD CLASS="quote">Ok ive been looking into making my own fmic piping and read/hearing alot of mixed thoughts on intercooler piping that i want to clear up.
1.) less piping = quicker spool
2.) 3" piping is to large for cars making less then 400whp
3.) sharp bends cause lag and or compressor surge
4.) most ideal location for BOV is within 6 inches of TB
5.) this is actually a part B to #2, but ive also noticed that most intercooler kits are like 2.25 from turbo to intercooler then become 3" as it meets the inter cooler. then is 3" from intercooler to turbo. supposedly this helps with throttle response
any care to answer these?</TD></TR></TABLE>
1.) not sure
2.) just match your ic piping between your IC ant throttle body to be the same size as the throttle body or slightly larger
2-b.) as stated try to match the housing as best you can
3.) not sure - but your guess seems plausable
4.) most stock turbo cars (MR2 turbo) have the BOV within 6" of the turbo - anywhere in the system will work fine
1.) less piping = quicker spool
2.) 3" piping is to large for cars making less then 400whp
3.) sharp bends cause lag and or compressor surge
4.) most ideal location for BOV is within 6 inches of TB
5.) this is actually a part B to #2, but ive also noticed that most intercooler kits are like 2.25 from turbo to intercooler then become 3" as it meets the inter cooler. then is 3" from intercooler to turbo. supposedly this helps with throttle response
any care to answer these?</TD></TR></TABLE>
1.) not sure
2.) just match your ic piping between your IC ant throttle body to be the same size as the throttle body or slightly larger
2-b.) as stated try to match the housing as best you can
3.) not sure - but your guess seems plausable
4.) most stock turbo cars (MR2 turbo) have the BOV within 6" of the turbo - anywhere in the system will work fine
12-14-2005, 01:07 PM
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Re: Intercooler questions (ferio 95)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ferio 95 »</TD></TR><TR><TD CLASS="quote">5.) this is actually a part B to #2, but ive also noticed that most intercooler kits are like 2.25 from turbo to intercooler then become 3" as it meets the inter cooler. then is 3" from intercooler to turbo. supposedly this helps with throttle response
any care to answer these?
</TD></TR></TABLE>
Huh? 2.25 from turbo to intercooler. then you say 3" from intercooler to turbo. do you mean 3" from intercooler to throttle body?
any care to answer these?
</TD></TR></TABLE>
Huh? 2.25 from turbo to intercooler. then you say 3" from intercooler to turbo. do you mean 3" from intercooler to throttle body?
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12-15-2005, 12:01 AM
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Re: Intercooler questions (ferio 95)
1.) less piping = quicker spool
If by less piping you mean smaller diameter and therefore volume of the air through the system, yes. It will take less time to raise the smaller of two volumes to the same pressure.
2.) 3" piping is to large for cars making less then 400whp
kinda relates to number 1. The bigger the piping the harder the compressor will work to pressurize all of it. You use bigger and bigger piping because compressor is set up to push too hard against the air because the engine can't suck it in fast enough.
3.) sharp bends cause lag and or compressor surge
Same rules apply to exhausts. a sharp turn limits flow and causes backups
4.) most ideal location for BOV is within 6 inches of TB
Probably always be in debate but I disagree. The purpose is to prevent the turbo from pressurizing a closed system because the TB is closed. So it makes sense to me to be as close to the turbo as possible, BUT............ changes in pressure are immediately felt throughout the system so it shouldn't matter where the BOV is located.
5.) this is actually a part B to #2, but ive also noticed that most intercooler kits are like 2.25 from turbo to intercooler then become 3" as it meets the intercooler. then is 3" from intercooler to throttle body. supposedly this helps with throttle response
I have a lot of crazy ideas but I bet its just because the kitbuilders don't make the ICs and the difference is probably arbitrary
If by less piping you mean smaller diameter and therefore volume of the air through the system, yes. It will take less time to raise the smaller of two volumes to the same pressure.
2.) 3" piping is to large for cars making less then 400whp
kinda relates to number 1. The bigger the piping the harder the compressor will work to pressurize all of it. You use bigger and bigger piping because compressor is set up to push too hard against the air because the engine can't suck it in fast enough.
3.) sharp bends cause lag and or compressor surge
Same rules apply to exhausts. a sharp turn limits flow and causes backups
4.) most ideal location for BOV is within 6 inches of TB
Probably always be in debate but I disagree. The purpose is to prevent the turbo from pressurizing a closed system because the TB is closed. So it makes sense to me to be as close to the turbo as possible, BUT............ changes in pressure are immediately felt throughout the system so it shouldn't matter where the BOV is located.
5.) this is actually a part B to #2, but ive also noticed that most intercooler kits are like 2.25 from turbo to intercooler then become 3" as it meets the intercooler. then is 3" from intercooler to throttle body. supposedly this helps with throttle response
I have a lot of crazy ideas but I bet its just because the kitbuilders don't make the ICs and the difference is probably arbitrary
12-15-2005, 07:21 AM
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Re: Intercooler questions (ferio 95)
also what i ment by less piping meaning faster spool. in case you havent picked up on it i have a 240/sr20 anyway alot of the tracked cars or drift cars like to run the vmount setup because it alows more air to the radiator and intercooler but its also nice to have because its less piping on the intercooler which is supposed to give waybetter response and quicker spool. its possible they are confusing response for spool but either way less pipe is supposed ot be faster boost since less air travel 
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