Why 3" pipein for intake mod on Boost?
08-09-2005, 01:27 PM
#1
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Why 3" pipein for intake mod on Boost?
Just thinkin out loud.. I can understand air velocity for N/A cars, thats why 3" maybe needed.
But wouldn't boosted car be different? I was thinkin of going with 4" ID pipeing ( whenever I get my other project done first ) since the velocity will still speed up when it gets compressed going into the TB opening.. the ID of the TB is bigger then 3" its somethin like just under 3.5" or something like that ( as I can fit a whole 3" ID filter opening into the TB on my car..
A smaller pipe would then reduce the amount of air being SUCKED into the TB then wouldn't it.. even though the Velocity maybe different
But wouldn't boosted car be different? I was thinkin of going with 4" ID pipeing ( whenever I get my other project done first ) since the velocity will still speed up when it gets compressed going into the TB opening.. the ID of the TB is bigger then 3" its somethin like just under 3.5" or something like that ( as I can fit a whole 3" ID filter opening into the TB on my car..
A smaller pipe would then reduce the amount of air being SUCKED into the TB then wouldn't it.. even though the Velocity maybe different
08-09-2005, 01:41 PM
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3" is usually used cause thats the size of the throttle body (well close). 4" would be less restrictive and better for sc applications but you would need a 4 to 3" reducer and the 4" is tougher to route and make work?
08-09-2005, 01:41 PM
#3
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You have to look at the big picture with fluid dynamics. ADTR actually test 2.5", 3", and 3.5" pipes. The conclusions backed up my theory.
1. 2.5" is sufficient for flow on an L27 and an L36. Laminar flow is more important for these cars than supercharged, but laminar flow is more efficient in the high-flow demands of an L67.
2. The larger the pipe, the less laminar flow you get. Velocity helps with the laminar flow, and allows you to move the air more efficiently in the right direction.
3. A 4" pipe will NOT be as laminar as a 3", and based on flow calculations of the M90 and M62 at typical performance pulley sizes we run, none of us can outlflow a 3" pipe.
1. 2.5" is sufficient for flow on an L27 and an L36. Laminar flow is more important for these cars than supercharged, but laminar flow is more efficient in the high-flow demands of an L67.
2. The larger the pipe, the less laminar flow you get. Velocity helps with the laminar flow, and allows you to move the air more efficiently in the right direction.
3. A 4" pipe will NOT be as laminar as a 3", and based on flow calculations of the M90 and M62 at typical performance pulley sizes we run, none of us can outlflow a 3" pipe.
08-10-2005, 11:48 AM
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Not to add more to the ever constant discussion of intake pipes, BUT ......
http://www.weapon-r.com/store/agora....&ppinc=search2
They claim things like higher volume, laminar flow, venturi effect, etc ....
Any experts care to share their thoughts? Could one of these 3.5" pipes be beneficial on a L67 or am I just wishing and should stick with the AutoZone ricer pipe?
http://www.weapon-r.com/store/agora....&ppinc=search2
They claim things like higher volume, laminar flow, venturi effect, etc ....
Any experts care to share their thoughts? Could one of these 3.5" pipes be beneficial on a L67 or am I just wishing and should stick with the AutoZone ricer pipe?
08-10-2005, 12:27 PM
#6
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Originally Posted by griff1455
Not to add more to the ever constant discussion of intake pipes, BUT ......
http://www.weapon-r.com/store/agora....&ppinc=search2
They claim things like higher volume, laminar flow, venturi effect, etc ....
Any experts care to share their thoughts? Could one of these 3.5" pipes be beneficial on a L67 or am I just wishing and should stick with the AutoZone ricer pipe?
http://www.weapon-r.com/store/agora....&ppinc=search2
They claim things like higher volume, laminar flow, venturi effect, etc ....
Any experts care to share their thoughts? Could one of these 3.5" pipes be beneficial on a L67 or am I just wishing and should stick with the AutoZone ricer pipe?
I doubt any cars shown on that site or their customers could outflow a 3" pipe if we can't with our L67'* that are pulley'd. Do the math on the cost of that intake, and I doubt the extra $$$$ is worth the unclaimed horsepower increase in that article.
In simpler terms, if a Honda can't outflow a 3" pipe to begin with, what'* the friggin' point in doing this? Bragging rights. Nothing more.
AIR FILTER / COUPLERS / HOSES ALL SOLD SEPERATELY.
Made of 6061 Aluminum
Mendrel Bent
Hand Tig Welded
Made to your spec'*
Charges:
Per Bend: $40
Per 12" Straight Section: $40
Per Nipple:
4mm Nipple Welded: Add $20
8mm Nipple Welded: Add $22
10mm Nipple Welded: Add $23
15mm Nipple Welded: Add $25
1" Nipple Welded: Add $30
Per Aluminum Air Flow Sensor:
Subaru Air Flow Sensor Welded: Add $40 ( SENSOR 2 )
Nissan Air Flow Sensor Welded: Add $40 ( SENSOR 3 )
Ford Air Flow Sensor Welded: Add $40 ( SENSOR 3 )
Toyota Square Air Flow Sensor Welded: Add $40 ( SENSOR 1 )
Toyota Triangle Air Flow Sensor Welded: Add $40 ( SENSOR 2 )
Polishing:
Per 24": Add $50
Per 48": Add $60
Convert custom intake to Secret Weapon Configuration:
Add: $90
Please include 6 good pictures ( Multiangle ) with an measuring tape next to the OEM intake pipe.
Drawing of your desired configuration.
Size and location of nipple(*).
Type and Location of Sensor. ( If applicable )
Made of 6061 Aluminum
Mendrel Bent
Hand Tig Welded
Made to your spec'*
Charges:
Per Bend: $40
Per 12" Straight Section: $40
Per Nipple:
4mm Nipple Welded: Add $20
8mm Nipple Welded: Add $22
10mm Nipple Welded: Add $23
15mm Nipple Welded: Add $25
1" Nipple Welded: Add $30
Per Aluminum Air Flow Sensor:
Subaru Air Flow Sensor Welded: Add $40 ( SENSOR 2 )
Nissan Air Flow Sensor Welded: Add $40 ( SENSOR 3 )
Ford Air Flow Sensor Welded: Add $40 ( SENSOR 3 )
Toyota Square Air Flow Sensor Welded: Add $40 ( SENSOR 1 )
Toyota Triangle Air Flow Sensor Welded: Add $40 ( SENSOR 2 )
Polishing:
Per 24": Add $50
Per 48": Add $60
Convert custom intake to Secret Weapon Configuration:
Add: $90
Please include 6 good pictures ( Multiangle ) with an measuring tape next to the OEM intake pipe.
Drawing of your desired configuration.
Size and location of nipple(*).
Type and Location of Sensor. ( If applicable )
08-10-2005, 12:40 PM
#7
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Ya know, I had this little voice in the back of my head saying "willwren is gonna say ....." and I was thinking it myself, I just had to have somebody tell me! 
They quoted me an estimate of $225, my measurements, and no garrauntee of fit. If the gains would be worth it, I would jump, but I think that $225 will be best invested elswhere.
They quoted me an estimate of $225, my measurements, and no garrauntee of fit. If the gains would be worth it, I would jump, but I think that $225 will be best invested elswhere.
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