LT1 only, Xpipe vs open headers
Thread Starter
Teching In
Joined: Jul 2010
Posts: 39
Likes: 0
LT1 only, Xpipe vs open headers saw a post where LS guys replied but i'm looking for LT1 specific experience please
for those of us that want every last mph at the track, what have you guys seen through an X vs opening cutouts or pulling catback? thank you.
for those of us that want every last mph at the track, what have you guys seen through an X vs opening cutouts or pulling catback? thank you.
Pretty sure open headers lose low end torque but make it back up higher.
And if you run it out the back it should be like the opposite or something?
True duals will always outflow a Y-pipe system, even with a cutout - or so they say.
I don't have any numbers, but I DEFINITELY noticed a difference from going open headers to a true dual X-pipe setup, even with cats and bullet mufflers.
And if you run it out the back it should be like the opposite or something?
True duals will always outflow a Y-pipe system, even with a cutout - or so they say.
I don't have any numbers, but I DEFINITELY noticed a difference from going open headers to a true dual X-pipe setup, even with cats and bullet mufflers.
X pipe- equalizes the banks and helps accelerate gases thought the exhaust system.
Open headers- will not have equalization and while they will make more power than stock manifolds you are not maximizing the potential of a long tube headers design.
Cut out- A cut out after an X or Y is the best place for them so you get the benefit of equalization and free flow.
Open headers- will not have equalization and while they will make more power than stock manifolds you are not maximizing the potential of a long tube headers design.
Cut out- A cut out after an X or Y is the best place for them so you get the benefit of equalization and free flow.
X pipe- equalizes the banks and helps accelerate gases thought the exhaust system.
Open headers- will not have equalization and while they will make more power than stock manifolds you are not maximizing the potential of a long tube headers design.
Cut out- A cut out after an X or Y is the best place for them so you get the benefit of equalization and free flow.
Open headers- will not have equalization and while they will make more power than stock manifolds you are not maximizing the potential of a long tube headers design.
Cut out- A cut out after an X or Y is the best place for them so you get the benefit of equalization and free flow.
On The Tree
Joined: Jun 2005
Posts: 105
Likes: 0
From: Wyoming
sounds like regurgitated internet hearsay to me. I don't see ANY race cars running any sort of x pipe or "equilization" device. Exhaust design is very complicated, and needs to compliment the camshaft, intake design, valve sizes, displacement, rpm window, etc. I'd run it with 24" collector extensions, cut off 4 inches on each pass until you lose mph. Obviously recording DA at the time of the passes will help determine the gains or losses if you're not making passes within a few minutes of eachother.
Trending Topics
Thread Starter
Teching In
Joined: Jul 2010
Posts: 39
Likes: 0
my goal is a lightweight, MAX effort track exhaust that is, or can somehow be a Little street friendly(ie not chopping, open LTs next to police).
so far i have LTs and 3" dynomax bullets(if they hurt power, atleast they'll quiet it down for the street while sounding nice). just trying to decide if i should even bother with an X or go straight to dumped bullets? and if i should rethink cutouts for track? if so, before or after X? ugh my head hurts.
i imagine Wicked may be onto something with the tuning lengths
so far i have LTs and 3" dynomax bullets(if they hurt power, atleast they'll quiet it down for the street while sounding nice). just trying to decide if i should even bother with an X or go straight to dumped bullets? and if i should rethink cutouts for track? if so, before or after X? ugh my head hurts.
i imagine Wicked may be onto something with the tuning lengths
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo Thread Starter
Teching In
Joined: Jul 2010
Posts: 39
Likes: 0
this is one of the few that inspired my dynomax bullet purchase.. note in the comments, he later put on an X ??
http://www.youtube.com/watch?v=NlBHf...ext=1&index=22
Also the impressive SR Ai 355, who opted for just an open X pipe off the headers for track days?
http://www.youtube.com/watch?v=vWMmD...eature=related
ugh
http://www.youtube.com/watch?v=NlBHf...ext=1&index=22
Also the impressive SR Ai 355, who opted for just an open X pipe off the headers for track days?
http://www.youtube.com/watch?v=vWMmD...eature=related
ugh
I would do an X-pipe with Dynomax Bullets dumped at the axle, that way you can drive on the street, I had mine with aftermarket cats and 2.5" piping and it was VERY tolerable and sounded great.
I couldn't imagine a Dynomax Bullet being restrictive, have you seen the inside of them?
I couldn't imagine a Dynomax Bullet being restrictive, have you seen the inside of them?
Thread Starter
Teching In
Joined: Jul 2010
Posts: 39
Likes: 0
what are the specs on your engine?
displacement? 355ci
heads? Ai 200
cam? Ai 23X
compression? ~10.5
* +150-200 shot
what did it dyno? or what does it run and what's the car weight? no dyno/et's yet but i wouldnt expect much more than ~550whp through 4L+yank 4K, about 3400# with me in it. possibly mid 10s with the right tire? i just don't want to leave anything on the table.
displacement? 355ci
heads? Ai 200
cam? Ai 23X
compression? ~10.5
* +150-200 shot
what did it dyno? or what does it run and what's the car weight? no dyno/et's yet but i wouldnt expect much more than ~550whp through 4L+yank 4K, about 3400# with me in it. possibly mid 10s with the right tire? i just don't want to leave anything on the table.
And there's no reason you need lt1 specific results for this. It's not some magical motor that defies physics.
I'm seeing around 66" from end of primary to the X to be the optimum length. Or ~16.5" collector length for open headers. Or the same ~16.5" to an H pipe if you wanted to try that. Total exhaust length from the end of the primary to the tail pipes would be 132. I'm going off a 230/238 on a 108+2. I think open headers will benefit you the most on this combo.
