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Crossover "rules"???

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Old Feb 22, 2007 | 01:30 PM
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Default Crossover "rules"???

Just need some basic info.

1) Crossover (H or X-pipe) vs. No crossover in a true dual setup?
a)Why or why not

2) Crossover location... Does it matter, how much and what will happen with a "badly located" crossover?

3) Which is worse, no crossover at all vs. a "misplaced" one?

I'll explain later...
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Old Feb 22, 2007 | 02:06 PM
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Enny-Body??
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Old Feb 22, 2007 | 03:07 PM
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Hate to keep bumping, but I need to know these as quickly as possible!!!

Thanks in advance!
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Old Feb 22, 2007 | 03:08 PM
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Listen.....you need to install a crossover pipe (balance pipe) when you convert to true duals, to equalize the exhaust pulse pressure between the to pipes (bank 1 and bank 2). Otherwise your exhaust pulses will be out if sync and cause a stumbling or miss.

I find that a H pipe is easy to install and solves the out of sync problem, but the use of an X Pipe does the same but I have noticed an increase in low end torque with use of an X pipe.

As far as the proper location of the balance pipe.....ahh I have no idea. I place them generally about 1 foot further back than the collectors of the headers.
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Old Feb 22, 2007 | 03:11 PM
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Thank you.

Any others?
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Old Feb 22, 2007 | 03:15 PM
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Originally Posted by Torque_Wrench
I find that a H pipe is easy to install and solves the out of sync problem, but the use of an X Pipe does the same but I have noticed an increase in low end torque with use of an X pipe.


i'm going to have to refute this claim. generally, an H-pipe will provide better low-end power where an X-pipe is generally better for top-end. i've seen a dyno of a mustang that switched from an H-pipe to an X-pipe. the H-pipe outperformed the X-pipe all the way to ~5,000 rpm's where the X-pipe started to produce a few more horsepower. i doubt the LS1 will act any differently. the X-pipe is for peak horsepower, the H-pipe is for sound depth and low-end.
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Old Feb 22, 2007 | 03:18 PM
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taco> chocotaco?......taco<chocotaco?......hmm im confused
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Old Feb 22, 2007 | 03:21 PM
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I was planning on an H-pipe anyway.

What the deal is is this...

Took my car to muffler shop. Told muffler guy I wanted duals run like this (showed him on car while car was on lift). I said I want an H-pipe where ever is best for an h-pipe to be...

Pick my car up...

Muffler guys help (he's not there!!!): "We didn't have room between the pipes to put you an H pipe in there, so it's just 2 pipes all the way back...

Metrying to remain civil)............. Ummm, OK.....

I leave since the guy that runs the place (and does the work) wasn't there anyway.

I like the sound but I know it's wrong, what I was asking is HOW and do what degree is not having a crossover at all going to compare to an H pipe that is in the "wrong" place?
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Old Feb 22, 2007 | 03:22 PM
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Right now... ME<all...

Last edited by Taco; Feb 22, 2007 at 03:24 PM. Reason: error in judgement!
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Old Feb 22, 2007 | 03:22 PM
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Originally Posted by Torque_Wrench
you need to install a crossover pipe (balance pipe) when you convert to true duals, to equalize the exhaust pulse pressure between the to pipes (bank 1 and bank 2). Otherwise your exhaust pulses will be out if sync and cause a stumbling or miss.
Uh, who told you that? You won't have stumbling or a miss because you have duals with no merge. Most muscle cars of the 60s/70s with duals didn't come with a merge in the exhaust. I've got duals on my truck with no merge (banks 1 & 2 never intersect) & it runs great. What a merge does first & foremost, X or H, is promote the scavenging process. It also balances the exhaust pulses between banks, but this isn't something that needs to be done for the motor to run correctly. As for optimum placement, I've always heard rule of thumb is around 18-20" from the collector, but that's not always possible. Putting it too far back won't hurt anything, but the scavenging effect would be minimal if any at all.

Last edited by jmm98LS1; Feb 22, 2007 at 04:05 PM.
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Old Feb 22, 2007 | 03:24 PM
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Can you put one too far forward?

The deal is, the pipes are BOTH run on the passenger side of the torque arm. There really is very little room between them.

Will it hurt to put the "H" right where the come together?
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Old Feb 22, 2007 | 03:29 PM
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That should work fine, the merge on my camaro's duals is right at the tailshaft of the transmission.
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Old Feb 22, 2007 | 03:33 PM
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Originally Posted by staringback05
taco> chocotaco?......taco<chocotaco?......hmm im confused
chocotaco >> all. it's not his fault.



you're really getting creative with those avatars aren't you?

Originally Posted by Taco
Muffler guys help (he's not there!!!): "We didn't have room between the pipes to put you an H pipe in there, so it's just 2 pipes all the way back...
bullshit. take it back and bitch. you told them what you wanted and they didn't do it. you better not pay them an extra dime to fix that ****. many people on this site have an H-pipe merge. make sure they fix it. you do NOT want straight-piped duals with no crossover. get a pic of someone's duals on this site and rub it in their face.
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Old Feb 22, 2007 | 03:35 PM
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OK... thanks fellers, I knew I could count on y'all!!!

Back to the muffler shop I go!!!
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Old Feb 22, 2007 | 03:41 PM
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Oh no... there will be no more moneys exchanged on this job!!!
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