Is Greddy SP2 2.5" or 3" exhuast?
Is Greddy SP2 2.5" or 3" exhuast?
05-16-2011, 09:48 PM
#9
yup its 2.5 but im going to have the piping redone to 3 because its starting to rust really bad at the y pipe. [the guy i bought my SP2 from crashed his 8 and the shop i chose at the time did a shitty job at welding.] might as well do it now, if i ever decide to go FI.
05-17-2011, 10:54 AM
#11
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got the SP2 on the car yesterday..
Mazsport mid pipe and SP2 make a quite nice combo. I was concerned it would be to loud for daily driving but is nice and civilized until you get on it..they got the sound just right, I am very pleased!
Mazsport mid pipe and SP2 make a quite nice combo. I was concerned it would be to loud for daily driving but is nice and civilized until you get on it..they got the sound just right, I am very pleased!
05-20-2011, 10:01 AM
#12
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Um no. Area of a 3" pipe=> pi*r^2 is pi*(1.5)^2 ~ 7.07in^2, whereas dual 2.25" is going to be 2(pi*(1.125)^2)~7.95in^2. So technically dual 2.25" pipes is equivalent to 7.95=pi(r)^2, divide by pi then square root to get=> r=1.591, times two for diameter which is roughly 3.18".
Done.
Done.
05-20-2011, 04:36 PM
#14
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If you think post count has something to do with intelligence then I don't think you're qualified to speak on the matter. I guess some people just don't have the capacity for intelligence.
The area of a 4.5" pipe is much greater than the area of two 2.25" pipes. Simple as that. It's not the same as just adding the diameter of two pipes together because your are dealing with circles, not squares.
- Mr. 10 Posts
P.S.- If you want to get into surface area, that may be more accurate of a comparison.
The area of a 4.5" pipe is much greater than the area of two 2.25" pipes. Simple as that. It's not the same as just adding the diameter of two pipes together because your are dealing with circles, not squares.
- Mr. 10 Posts
P.S.- If you want to get into surface area, that may be more accurate of a comparison.
05-20-2011, 05:02 PM
#15
The X is silent
Um no. Area of a 3" pipe=> pi*r^2 is pi*(1.5)^2 ~ 7.07in^2, whereas dual 2.25" is going to be 2(pi*(1.125)^2)~7.95in^2. So technically dual 2.25" pipes is equivalent to 7.95=pi(r)^2, divide by pi then square root to get=> r=1.591, times two for diameter which is roughly 3.18".
Done.
Done.
BTW: Mass Flow Rate is determined by flow area, and fluid density and velocity, not by post count.
05-20-2011, 05:25 PM
#16
you all crack me up.... I was simply saying that just because the 3 in. pipe gets split into 2 seperate smaller pipes does not mean that you have a negative restriction. JDM, your answer actually proved my point. I added the 9 post comment for a lol, this is the internet after all.
Last edited by Chris; 05-20-2011 at 05:46 PM.
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