X pipes???

General engine tech -- Drag Racing to Circle Track

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digger
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Re: X pipes???

Post by digger »

I have found that with an X-pipe the location w.r.t to the valve can affect the bottom end torque significantly on an engine with full exhaust and rear tailpipes (i.e. a long system) which is important for a true street engine. I think the X-pipe acts like a half baked termination box depending on the area change and volume of the x-pipe. On a system will small pipe sizes it would make sense there is a potential improvement from reduction in back pressure due to the larger effective area to flow into but it would need to be fairly small sizing (or extremely long) to reap a large benefit

In engmod4T i think i found the order from best to worst

end of pipe (terminated at location of X,Y,H)
Y-pipe
X-pipe
H-pipe

the end of pipe was best but it was shorter which would lead to a PWTB being best perhasp.

The X, Y and H were all vert close to being the same
emsvitil
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Re: X pipes???

Post by emsvitil »

Do you want the X-pipe designed so that the exhaust volume is split 50/50 at the merge?
Ed
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