X pipe design shape

[robvas]

Why did they stop the test at 6500 RPM?

who knows

but there wasn't going to be some big difference appearing out of nowhere

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[GregO]

6500 rpms and up on a cross plane crank V8 the true X becomes an issue.

 

[K4fxd]

6500 rpms and up on a cross plane crank V8 the true X becomes an issue.

This is news to me. I know several people with 10K rpm engines running X pipes.

Do you have any links to tests?

 

[robvas]

6500 rpms and up on a cross plane crank V8 the true X becomes an issue.

What does 'becomes an issue' mean? I don't see anything happening at 6500 rpm on either of these X pipe dynos

 

[GregO]

Note: True X
Not Sweep X or Oval tube sweep X such as in NASCAR.

 

[K4fxd]

Note: True X

Again do you have any links to tests or is this just your opinion?

 

[GregO]

Just some teachings from Big Joe Sherman and Calvin Elston.
You know a couple of nobody guys. LOL
You’re old enough to know who Joe Sherman is without the Google memory crutch.

 

[GregO]

When Big Joe shared info. GregO listens.
When Calvin Elston shares his knowledge GregO takes notes.

https://www.speed-talk.com/forum/viewtopic.php?t=22988

 

[GregO]

What does 'becomes an issue' mean? I don't see anything happening at 6500 rpm on either of these X pipe dynos

Steeda is a Sweep X design not a True X.
There’s still the designed waist area to be cautious about that it’s not undersized.

 

[K4fxd]

When Big Joe shared info. GregO listens.

Just wondering because Jeff Lutz uses, or did use a true X pipe on his 57. I can't imagine him using something that hurts power. I was actually surprised when I saw it on the car.

I can say I had one on my car and got rid of it because I thought it hurt power. I never dynoed it.

 

[tj@steeda]

Some differences in the Steeda unit:

Product Benefits:

• Proudly made in the USA!
• Up to +8 hp
• Up to +9.5 lb/ft of torque
• X-pipe design improves exhaust flow over the factory resonator and H-pipe design up to 20%
• 304SS will not rust like inferior 409SS or aluminized steel pipes

Steeda is a solid option (I know there are other conversations taking place but wanted to share the Steeda difference

https://www.steeda.com/steeda-555-3618-s550-x-pipe

 

[Pistol_91]

Not sure who this guy is, but he's wearing a lab coat. So, he must be smart.
He has some interesting points.

 

[GregO]

The first X crossover example is text book Porsche 6 cylinder which is effective for the 6 cylinders.
The second example was referred to as an H pipe but is clearly a stamped sweep X.
The air hose and toilet paper example is cute but anyone into exhaust science knows exhaust gasses after the header collectors is a tumble and roll situation.

 

[Pistol_91]

The first X crossover example is text book Porsche 6 cylinder which is effective for the 6 cylinders.
The second example was referred to as an H pipe but is clearly a stamped sweep X.
The air hose and toilet paper example is cute but anyone into exhaust science knows exhaust gasses after the header collectors is a tumble and roll situation.

You should make a YouTube video and wear a 2 lab coats. And put this guy's video to shame for putting crappy information on YouTube. LOL

Btw didn't even know exhaust science was a thing. Is it more of a hobby like radio people or is it an actual thing?

 

[K4fxd]

Btw didn't even know exhaust science was a thing. Is it more of a hobby like radio people or is it an actual thing?

You are kidding, right?

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