Has anyone tried this X flow? - ZR-1 Net Registry Forums

secondchance · 10-17-2011

http://www.dynomax.com/mufflers.php?muffler=ultraflox

"X" flow supposedly should help with flow resulting in better scavanging. Down side has always been the dreaded drone.
Looks like this piece may achieve better flow with minimal downside. Has anyone tried this?
At leasy visually this piece looks like it may splice in for our Zs with minor alteration.

Bob Eyres · 10-17-2011

This is the first time I've seen that type of resonator. I like the combo of Xpipe/Resonator in one unit. But look closely at the size of the pipe on the inside compared to the outside inlets. It sure looks like it necks down to a smaller size inside. And for anyone with a genuine 3" exhaust, that's a no, no.

They say that the inside X is 3", but the illustration makes me question that.

secondchance · 10-17-2011

Quote:

Originally Posted by Bob Eyres

This is the first time I've seen that type of resonator. I like the combo of Xpipe/Resonator in one unit. But look closely at the size of the pipe on the inside compared to the outside inlets. It sure looks like it necks down to a smaller size inside. And for anyone with a genuine 3" exhaust, that's a no, no.

They say that the inside X is 3", but the illustration makes me question that.

It could be the illustration is for 3-1/2" inlet and outlet unit.
If the inside is truly 3" this could be an interesting piece.

QB93Z · 10-17-2011

It seems to me that the X design they have created would be very restrictive. On the inlet side there are two 3" diameter pipes for a total cross sectional area of 28.2 square inches. At the center of the X the pipe would have to be 4.2 inches in diameter (or some oval shape) to have the same cross section area. And there would need to be a smooth transition through the shape changes.

Jim

Bob Eyres · 10-17-2011

Quote:

Originally Posted by QB93Z

It seems to me that the X design they have created would be very restrictive. On the inlet side there are two 3" diameter pipes for a total cross sectional area of 28.2 square inches. At the center of the X the pipe would have to be 4.2 inches in diameter (or some oval shape) to have the same cross section area. And there would need to be a smooth transition through the shape changes.

Jim

I agree, but it may be more than just the actual cross section area to be concerned about. The shape of that area at the center of the X where the four pipe sections meet looks critical to the effectiveness of the X pipe. There may be a lot more involved in tuning those pulses than us bench racers are aware of.

secondchance · 10-17-2011

Quote:

Originally Posted by QB93Z

It seems to me that the X design they have created would be very restrictive. On the inlet side there are two 3" diameter pipes for a total cross sectional area of 28.2 square inches. At the center of the X the pipe would have to be 4.2 inches in diameter (or some oval shape) to have the same cross section area. And there would need to be a smooth transition through the shape changes.

Jim

I hear what you are saying - two 3" dia pipes crossing each other vs. two pipes merging and joined w/ larger area open to each other.

secondchance · 10-17-2011

Actually, taking another look at the illustration, area shared by the 2 pipes looks pretty substantial.
The whole idea of X flow is utilizing pulsing and resulting low pressure of pulse tail end of the opposite bank to create suction for the front end of the other bank.
I think, if the inner pipes are indeed 3" dia., this could be a worthwhile piece especially for stock piece replacement.

QB93Z · 10-18-2011

Buy one and bring it over. I have a saws-all. We can cut it in half and take some measurements.

Jim

secondchance · 10-18-2011

Quote:

Originally Posted by QB93Z

Buy one and bring it over. I have a saws-all. We can cut it in half and take some measurements.

Jim

Can I try it on my car first? My exhaust might end up w/ band clamps for the entire length!

XfireZ51 · 10-18-2011

There appears to be 2 variations of the Xpipe design.
One variant is made by slicing the sides of the pipes and joining them at the opening. The SW seems to be of this type. A second type utilizes a common center box with the inlets and outlets merged. Some of these appear to retain the individual pipe contour as they merge or x-over.
Here's an example w 4" center to center.
http://cgi.ebay.com/ws/eBayISAPI.dll...r#ht_500wt_689

10-17-2011	#1
secondchance Join Date: Aug 2006 Location: McLean, VA Posts: 3,723	Has anyone tried this X flow? http://www.dynomax.com/mufflers.php?muffler=ultraflox "X" flow supposedly should help with flow resulting in better scavanging. Down side has always been the dreaded drone. Looks like this piece may achieve better flow with minimal downside. Has anyone tried this? At leasy visually this piece looks like it may splice in for our Zs with minor alteration.

10-17-2011	#2
Bob Eyres Join Date: Jul 2005 Location: Jupiter, Fl. Posts: 815	Re: Has anyone tried this X flow? This is the first time I've seen that type of resonator. I like the combo of Xpipe/Resonator in one unit. But look closely at the size of the pipe on the inside compared to the outside inlets. It sure looks like it necks down to a smaller size inside. And for anyone with a genuine 3" exhaust, that's a no, no. They say that the inside X is 3", but the illustration makes me question that. __________________ "It's about the car, not the people." 1991 ZR-1 White/Black #1236 (Owner since 1994). Stock engine with bolt-ons: Hurst shifter,"Forced Air" intake, Coplon duct, Bee Cool Radiator, Demon coils, Jeal prom, Watson headers, X pipe, 3" B&B's, Rippie flywheel, 4:10 gears, A molds, Toyo Proxes-R888's 12.06@117mph. 1.76 60ft.

10-17-2011	#4
QB93Z Join Date: May 2007 Location: Westminster, Maryland Posts: 3,689	Re: Has anyone tried this X flow? It seems to me that the X design they have created would be very restrictive. On the inlet side there are two 3" diameter pipes for a total cross sectional area of 28.2 square inches. At the center of the X the pipe would have to be 4.2 inches in diameter (or some oval shape) to have the same cross section area. And there would need to be a smooth transition through the shape changes. Jim __________________ If it isn't fun, you aren't doing it right! 1990 Black ZR-1 - sold 1993 Quasar Blue ZR-1 1994 Competition Yellow ZR-1 1995 Dark Purple ZR-1 Maryland State Coordinator WAZOO Member

10-17-2011	#7
secondchance Join Date: Aug 2006 Location: McLean, VA Posts: 3,723	Re: Has anyone tried this X flow? Actually, taking another look at the illustration, area shared by the 2 pipes looks pretty substantial. The whole idea of X flow is utilizing pulsing and resulting low pressure of pulse tail end of the opposite bank to create suction for the front end of the other bank. I think, if the inner pipes are indeed 3" dia., this could be a worthwhile piece especially for stock piece replacement.

10-18-2011	#8
QB93Z Join Date: May 2007 Location: Westminster, Maryland Posts: 3,689	Re: Has anyone tried this X flow? Buy one and bring it over. I have a saws-all. We can cut it in half and take some measurements. Jim

10-18-2011	#10
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,708	Re: Has anyone tried this X flow? There appears to be 2 variations of the Xpipe design. One variant is made by slicing the sides of the pipes and joining them at the opening. The SW seems to be of this type. A second type utilizes a common center box with the inlets and outlets merged. Some of these appear to retain the individual pipe contour as they merge or x-over. Here's an example w 4" center to center. http://cgi.ebay.com/ws/eBayISAPI.dll...r#ht_500wt_689