Stacey Davids Gearz. H pipe verses X pipe

-
Oldmanmopar

Oldmanmopar

Going left turning right
FABO Gold Member
Joined
Jan 8, 2009
Messages
13,336
Reaction score
12,989
Location
Danielsville Pa. 18038
Did anyone catch the show today. Rerun on exhaust systems. There was a 30 hp gain on a dyno. H over the X.

Sorry you guys paid so much for those cool looking good for pictures only X's. They only made a 6 hp gain over the stock system. The H made 41 more.

Don't say I didn't tell you all so. My pipes are 3 1/2 with a with a 2 1/2 H . Just enough to equalize the back pressure without side to side turbulence.

Oh yeah the company doing the test sells both. I guess ones for show the others for go. So Mopar had it right in the 60's.

I must say the x's do look good on the lift though.

Here's mine It isn't pretty but it is not built for show. Anything put on this car served a purpose and had to be inexpensive and street-able at the time. Now I wish I would have left the interior out and used less mills of paint. But it is what it is. Next is a F2 and port injection. Dana and Calverts. I may put metal rollers in the tips so they don't get scraped.

Well now I feel good . LOL

Lets get started with the funny stuff.

Some of you guys would have a blast sitting around with us old bastards at the shop and talking of the old days. It seems not so long ago. You may even remember or know some of us. Easy to find follow the rubber.

We can only talk we don't pass the physical anymore. but we can terrorize the streets. Yes the POPO are always here waving there finger. Maybe we'll be here tomorrow maybe one will be missing . The chairs are getting emptier. You never know when your numbers up.

Some of us loose power and crawl along for awhile . Some of us throw a rod and everything comes out the bottom. I hope I'm the latter of the two. I hate going slow. See ya tommorrow ??? Steve
 

Attachments

  • DSCF0151.jpg
    63.9 KB · Views: 1,075
  • back3[1].jpg
    73.4 KB · Views: 958
  • back4[1].jpg
    70.9 KB · Views: 950
  • back1[1].jpg
    98.5 KB · Views: 928
  • DSCF0342[1].jpg
    53.3 KB · Views: 945
Is that peak hp, or cumulative hp? and the torque curves?
 
I tried asking but he didn't hear me.. Could have been Clydesdale's for all I know. Or even a Mule. I just watched the show I wasn't there.
 
I want to see a dyno pull that shows conclusively
with is better.
All I can find is cobbled together crap with some
supposed eggspurt giving his opion.
 
At the shop I work at, we just did a test on a Cup series X pipe style and an H pipe style tailpipes on our Eddy current dyno and a plate engine that ran at Talledega the next week. No difference at all. Neither was better than the other holding all other things constant. We run an H pipe on all of our dynos because the fit is better. We run the X pipe in the car for better ground clearance. Just giving our results for properly built, tuned exhaust systems.
 
I got these docs off some website. The fellow writing them appeared to have years of experience and development under his belt. Pretty interesting read.
 

Attachments

  • Exhaust Science (5).pdf
    487.1 KB · Views: 176
  • Exhaust Science (4).pdf
    459.5 KB · Views: 196
  • Exhaust Science (3).pdf
    352.4 KB · Views: 210
  • Exhaust Science (2).pdf
    416.3 KB · Views: 192
  • Exhaust Science (1).pdf
    526.2 KB · Views: 248
A friend of mine had an exhaust shop and a 408 stroker 351 Cleveland in a 68 Mustang. He was constantly modifying the exhaust to get optimum power and a certain favorite sound he was chasing. He also was a close friend of a guy who ran a tune up shop with a chassis dyno. He did an apples to apples comparison of various diametrs of H-pipes and a couple of different X-pipes and what he found on his car was almost zero HP difference between them all. The sound quality changed more than power. The last time I saw his car he had an X pipe on it with some Borla mufflers and tailpipes all the way out the back with turndowns. It still wasn't yielding the exact sound he wanted but he claimed that the setup was among the highest power producers he had run. I loved the sound so I put an X pipe and Borlas on my car and it sounds completely different. I still like it really well but I guess Mopars and Ford Clevelands just sound different.........and I have no idea about power as I don't have the luxury of unlimited exhaust parts or chassis dyno.
 
Oldmanmopar said:
Did anyone catch the show today. Rerun on exhaust systems. There was a 30 hp gain on a dyno. H over the X.

Sorry you guys paid so much for those cool looking good for pictures only X's. They only made a 6 hp gain over the stock system. The H made 41 more.

Don't say I didn't tell you all so. My pipes are 3 1/2 with a with a 2 1/2 H . Just enough to equalize the back pressure without side to side turbulence.

Oh yeah the company doing the test sells both. I guess ones for show the others for go. So Mopar had it right in the 60's.

I must say the x's do look good on the lift though.

Here's mine It isn't pretty but it is not built for show. Anything put on this car served a purpose and had to be inexpensive and street-able at the time. Now I wish I would have left the interior out and used less mills of paint. But it is what it is. Next is a F2 and port injection. Dana and Calverts. I may put metal rollers in the tips so they don't get scraped.

Well now I feel good . LOL

Lets get started with the funny stuff.

Some of you guys would have a blast sitting around with us old bastards at the shop and talking of the old days. It seems not so long ago. You may even remember or know some of us. Easy to find follow the rubber.

We can only talk we don't pass the physical anymore. but we can terrorize the streets. Yes the POPO are always here waving there finger. Maybe we'll be here tomorrow maybe one will be missing . The chairs are getting emptier. You never know when your numbers up.

Some of us loose power and crawl along for awhile . Some of us throw a rod and everything comes out the bottom. I hope I'm the latter of the two. I hate going slow. See ya tommorrow ??? Steve
Click to expand...

41hp? i wanna call BS. maybe on a diesel truck or something. As for H being better than X. I don't really care. I prefer the Xpipe sound.
 
stacy davis? is that the guy with the mullet? i don't buy a 41hp gain that sounds out of whack, maybe if they were testing a 1,200 hp engine or some giant cid turbo diesel.
 
magnumdust said:
41hp? i wanna call BS. maybe on a diesel truck or something. As for H being better than X. I don't really care. I prefer the Xpipe sound.
Click to expand...

I like the sound of mine. I have a stereo in it for my oldies CD's . The car needs to be off to here it. Even at max volume. I was thinking of putting the speakers in boxes and connecting them with an H pipe. Or should I do all four with an X for a better sound quality?
Sound seems to be far more important then performance when it comes to exhaust. Magna-flo proved that by building a truck to here their different mufflers on a rotating maching. Just for those who need that cackle in their exhaust like an old car with glass packs on a 1 1/2 inch system.

NOW THAT WE ARE GETTING GOING HERE. LETS REALLY HERE SOME GOOD REPLEYS. AND LLLOOOLLL!!!!!!!!!

I"LL BE BACK
 

Attachments

  • DSCF2823.jpg
    59.6 KB · Views: 720
I vote you interconnect all four speaker boxes to a shared pulse wave resonance box with acoustically tuned tubes. Then hook that to your intake manifold via another acoustically tuned tube so that your speakers will reverberate the moan of your intake resonance at full throttle.
 
Oldmanmopar said:
Don't say I didn't tell you all so. ...............Here's mine It isn't pretty
Click to expand...

Would you mind explaining this hookup? Do you sometimes plug the downturns?
 

Attachments

  • what.jpg
    21.1 KB · Views: 657
magnumdust said:
41hp? i wanna call BS. maybe on a diesel truck or something. As for H being better than X. I don't really care. I prefer the Xpipe sound.
Click to expand...

Hooked up the missing plug wire! :)

This is like one of my favorite jokes...

What's 80 year old pussy taste like? Depends.

This all depends on what you are dealing with, Peak you may not see any difference. There are cars that run better in the 1/4 with an X than an H or none at all. It's impossible to make a blanket statement regarding exhaust and have it apply to all situations. You find one exception, suddenly the premise is no longer valid.
 
Rob hit it it right.
My custom exhaust guiys says x's are for circle track and H's are for us guys.
Something to do with certain rpm powerband use in different cercumstances.
Made sense to me but sometimes even that straight line is hard for me to walk.
 
attachment.php


Is that snubber up as far as it can go?
 
67Dart273 said:
Would you mind explaining this hookup? Do you sometimes plug the downturns?
Click to expand...


I drive this car on the street and wanted it to look like a stock 340 car with a full exhaust and tips.

It is very radical and loud at an Idle. But when you walk behind the car some of the exhaust and noise is coming from the rear. It almost seems as if it is running through a full exhaust with tips. But as you see it is as open as it could be. The tail pipes saved me a couple of times during a walk around by the locals.

Like I said before It was built to go on a budget . But yet look like a street car. It has an 8 point cage with a full interior . and the factory spare is in the trunk with the mat. I have factory rallies for the car 10's and 5's .

I was saving all the shiny pennies and parts for the Demon.

This is just a car you can have a ton of fun with on the street. I don't drive it much but it goes through a set of tires per year on the street. A lot of them are hanging on the quarters . The rest is stuck to the grille of other cars.

I do have a couple of chips in my grille from some big stars. But no hoof prints and never been shown how to dance buy a gentleman . Its a mouse that scares the elephants. And its been mine for a very long time. I'm gonna miss it.

Oh yeah, It is called an adjustable snubber that is up one hole.
 

Attachments

  • DSCF0090.jpg
    78.8 KB · Views: 621
  • DSCF0091.jpg
    87.9 KB · Views: 620
Oldmanmopar said:
I drive this car on the street and wanted it to look like a stock 340 car with a full exhaust and tips.

It is very radical and loud at an Idle. But when you walk behind the car some of the exhaust and noise is coming from the rear. It almost seems as if it is running through a full exhaust with tips. But as you see it is as open as it could be. The tail pipes saved me a couple of times during a walk around by the locals. .
Click to expand...

"I see" said the blind cop to the deaf prosecutor, LOL
 
That is a beautiful car OldmanMopar...

My Signet's exhaust hasn't any crossover H or X just straight back under the rear to SuperTrapps.. when the last engine was built it's dyno was 479 hp so I figured I could lose a few and still run well and it did..
 
68383GTS said:
So what's the story on the Hawaiian pics?
Click to expand...

Just some pics of my past. The best time of my life. I added them to show you how young I stayed compared to the bottom pic. I have been playing with mopars for a very long time.

For those who want to know and have a welder . 3 1/2 mandrel bent turn downs can be used back to back to create your bends to get through the torsion bar cross member openings and keep the pipes tight up against the car.

Tight Angles can be made that a pipe bender cannot do with those big pipes. And they are not that expensive.
 
..a friend just put in 7 "X" pipes and got his up to an additional 42 hp (7 x 6hp),easily surpassing the 41 hp the H produced!
 
You must log in or register to reply here.
-

Back
Top