Question for LG Headers users
Thread Starter
Supporting Vendor
Joined: Jul 2010
Posts: 8,541
Likes: 888
From: Republic of Texas
Question for LG Headers users
LG headers have primaries that are insanely long which give you incredible torque, but i also noticed something else after I had mine installed:
We all know LT headers can take advantage of “gas scavenging” (which is nothing more than a fancy way of saying that pressure waves from each cylinder can take advantage of Bernoulli’s principle and create a low-pressure area in their wake that pulls the next wave with it generating tremendous torque.
Most LG headers have a “sweet spot” in the power band where the exhaust pulses are timed just perfect to complement each other. This spot can usually be identified by a change in exhaust sound. My Old SSAC headers did this around 3000 RPM.
The LG Super pros I just had installed seem to have two sweet spots. (one around 2200 and the other around 4500 RPM) I think this is because the primaries are so long that they can support either one exhaust pulse (at low RPM) or two pulses per primary (at high RPM) resulting in two distinct frequencies at which the pulses reach harmonic equilibrium.
Whatever the reason, it's really cool!!!
Any other LG users notice this?
We all know LT headers can take advantage of “gas scavenging” (which is nothing more than a fancy way of saying that pressure waves from each cylinder can take advantage of Bernoulli’s principle and create a low-pressure area in their wake that pulls the next wave with it generating tremendous torque.
Most LG headers have a “sweet spot” in the power band where the exhaust pulses are timed just perfect to complement each other. This spot can usually be identified by a change in exhaust sound. My Old SSAC headers did this around 3000 RPM.
The LG Super pros I just had installed seem to have two sweet spots. (one around 2200 and the other around 4500 RPM) I think this is because the primaries are so long that they can support either one exhaust pulse (at low RPM) or two pulses per primary (at high RPM) resulting in two distinct frequencies at which the pulses reach harmonic equilibrium.
Whatever the reason, it's really cool!!!
Any other LG users notice this?
Le Mans Master
Joined: Nov 2009
Posts: 6,119
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From: Huntington tx
Sweet Baby Jesus!!!! I didn't listen that close before, cause I have a hard enough time paying attention to just driving.....now I gotta go and check this out! Be back later!
Shake and BAKE!
Shake and BAKE!
Last edited by sfc rick; Dec 15, 2010 at 10:28 AM. Reason: Been watching Talladega Nights and laughing too much
Tech Contributor
Joined: Jan 2004
Posts: 20,030
Likes: 289
From: Wylie TX --> Less is More, except under the hood !
I thought it was just my wife that had a sweet spot... 
I do however notice that at a certain RPM's my LG PRO's sound insane at higher PRM's... That's a good thing...
Toque
I do however notice that at a certain RPM's my LG PRO's sound insane at higher PRM's... That's a good thing...
Toque
Former Vendor
Joined: Aug 2005
Posts: 16,897
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From: Lewisville TX
St. Jude Donor '03-'04-'05-'06-'07-'08-'09-'10-'11-'12-'13
Want to see (or better hear) something really cool is pair them with a change of cam, and it changes yet again and sounds completely different inside the car.
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Supporting Vendor
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From: Republic of Texas
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