BENEFITS of long tube headers on a Supercharged setup - Page 2

*radz28* · 08-30-2022, 09:34 AM

I think I recall JRE saying that the OEM cats-pipes really start retaining heat, and that heat starts working it's way back toward the exhaust ports. Then, you have to start pulling timing because that heat start affecting the combustion chambers.

Just passing along what I've read.

KingLT1 · 08-30-2022, 09:56 AM

Yep...and the pipe itself before going into the actual converter necks down to under 2" in diameter. You can still make power on stock exhaust you just have to be careful. Mike Sitar went high 9's on 100% stock exhaust.

JSH · 08-30-2022, 10:37 AM

Quote:

Originally Posted by asthmamax11

Any before and after dyno of headers on a supercharged setup ?

The hp gains from LT headers have been discussed here extensively. It's agreed to be one of the best early mods. +20 hp is probably a reasonable figure.

asthmamax11 · 08-30-2022, 12:54 PM

Ok excellent
Supercharged setups produce alot more heat

Next question is would headers make you lose any boost ?

LT1ornothing · 08-30-2022, 02:47 PM

[QUOTE=asthmamax11;11222307]Ok excellent
Supercharged setups produce alot more heat

Next question is would headers make you lose any boost ?[/QUOTE]

Boost is a measure of restriction. The less restrictions the engine has, the less boost it reads on a boost guage. Boost is not "lost" after headers, the engine is simply no longer as restricted as it was before the headers.

asthmamax11 · 08-30-2022, 03:26 PM

[QUOTE=1LEornothing;11222382]

Quote:

Originally Posted by asthmamax11

Ok excellent
Supercharged setups produce alot more heat

Next question is would headers make you lose any boost ?[/QUOTE]

Boost is a measure of restriction. The less restrictions the engine has, the less boost it reads on a boost guage. Boost is not "lost" after headers, the engine is simply no longer as restricted as it was before the headers.

Ok thanks for explaining

So turning boost back up to pre headers level would require more fuel ?

Joshinator99 · 08-30-2022, 03:41 PM

[QUOTE=asthmamax11;11222402]

Quote:

Originally Posted by 1LEornothing

Ok thanks for explaining

So turning boost back up to pre headers level would require more fuel ?

Actually, your boost number can go down with the headers and you might need MORE fuel anyway. Best description I’ve seen describes boost as “unused air”. So with headers your engine will become more efficient and use more air which would require more fuel. Hope that makes sense.

KingLT1 · 08-30-2022, 04:57 PM

Loss of boost does not mean a loss of power if flow and and efficiency increased.

Chrome383Z · 08-30-2022, 07:48 PM

Quote:

Originally Posted by KingLT1

Loss of boost does not mean a loss of power if flow and and efficiency increased.

Yup pretty basic. You could have 100psi through a 1” orifice and 10psi through a 4”. (I’m throwing numbers out). Airflow and fuel requirements could be the same.

JSH · 08-30-2022, 08:44 PM

The engine is just an air pump and greater volume per ms equals more power. We probably need a new thread for this topic though.

asthmamax11 · 08-30-2022, 11:38 PM

Thank you guys
I think I need to brush up on basic engine physics
Good info here

laynlo15 · 08-31-2022, 07:12 AM

Quote:

Originally Posted by 1LEornothing

As King said, front cats are most restricted. If you can score some cheap new era cat deletes, do it. I'm going with 2" SE catless headers. I have seen the dynos and ET gains, and the long tube headers pick up power and torque everywhere on the powerband, n/a or blower. But the gains seem to be more noticeable on blower setups.

So your leaving the rear cats in tacked and just elimination the fronts, Correct? I'm assuming that makes it a little louder.

LT1ornothing · 08-31-2022, 07:43 AM

Quote:

Originally Posted by laynlo15

So your leaving the rear cats in tacked and just elimination the fronts, Correct? I'm assuming that makes it a little louder.

No, I am going with Offroad 2" Longtubes into stock non npp suitcase muffler. I would not know about the volume increase of a primary only removal, but that sounds logical.

08-30-2022, 09:34 AM	#15
radz28 Petro-sexual Drives: Ultra-Grin Join Date: Oct 2006 Location: Crazy Coast Posts: 15,201 View My Garage	I think I recall JRE saying that the OEM cats-pipes really start retaining heat, and that heat starts working it's way back toward the exhaust ports. Then, you have to start pulling timing because that heat start affecting the combustion chambers. Just passing along what I've read. __________________ '20 ZL1 Black "Fury" A10, PDR, Exposed CF Extractor Magnuson Magnum DI TVS2650R // RFBG // Soler 103 // TooHighPSI Port Injection // THPSI Billet Lid // FF // Katech Drop-In // PLM Heat Exchanger // ZLE Cradle bushings // BMR Chassis-Suspension Stuff // aFe Bars // Diode Dynamics LEDs // ACS Composites Guards // CF Dash // Aeroforce // tint // other stuffs

08-30-2022, 09:56 AM	#16
KingLT1 Drives: 2016 1SS NFG A8 Join Date: Aug 2017 Location: 46804 Posts: 6,800	Yep...and the pipe itself before going into the actual converter necks down to under 2" in diameter. You can still make power on stock exhaust you just have to be careful. Mike Sitar went high 9's on 100% stock exhaust. __________________ 2016 NFG 1SS A8 Options-2SS Leather/NPP Perf. mods-Whipple 2.9/Fuel System/Flex Fuel/103mm TB/Rotofab Big Gulp/Cat Deletes/Corsa NPP Per. times- 10.5 @ 137 w/ 1.8 60ft Full weight on 20's 1200DA

08-30-2022, 12:54 PM	#18
asthmamax11 Drives: 1SS Summit White 6 speed Join Date: Jul 2017 Location: Gainesville GA Posts: 579	Ok excellent Supercharged setups produce alot more heat Next question is would headers make you lose any boost ? __________________ 16 1SS M6 White Magnuson 2.3 Heartbeat Roto Fab Solo Performance Cat deletes and Axleback Hurst short shifter #'s coming soon Riaction coilovers 1LE sway bars BMR mm BMR chassis brace Flow one 19" wheels wrapped in Mickey Thompsons 02 Z28 M6 35th anniversary 80k miles T-tops Leather Bolt ons Joy to drive this classic every day! Daily Driver

08-30-2022, 04:57 PM	#22
KingLT1 Drives: 2016 1SS NFG A8 Join Date: Aug 2017 Location: 46804 Posts: 6,800	Loss of boost does not mean a loss of power if flow and and efficiency increased. __________________ 2016 NFG 1SS A8 Options-2SS Leather/NPP Perf. mods-Whipple 2.9/Fuel System/Flex Fuel/103mm TB/Rotofab Big Gulp/Cat Deletes/Corsa NPP Per. times- 10.5 @ 137 w/ 1.8 60ft Full weight on 20's 1200DA

08-30-2022, 08:44 PM	#24
JSH Drives: '20 ZLE Join Date: Jun 2020 Location: Mile High Posts: 3,565	The engine is just an air pump and greater volume per ms equals more power. We probably need a new thread for this topic though. __________________ '20 ZL1 1LE A10, OEM short block, LME heads/valve train, E2650. 100+ octanes, no eth, no meth, no N2O. 2/23 - 1031/1004 wheel. 4/23 - 1.41/9.61/145 at DA 7000 ft. (only made five passes). 2/24 - LME 390, E2650, FBO, 100 oct.; 1116hp/ 1063tq; 109 oct. dyno next.

08-30-2022, 02:47 PM	#19
LT1ornothing Drives: 2020 LT1 M6 Join Date: Jan 2016 Location: South, the DEEP south Posts: 1,114	[QUOTE=asthmamax11;11222307]Ok excellent Supercharged setups produce alot more heat Next question is would headers make you lose any boost ?[/QUOTE] Boost is a measure of restriction. The less restrictions the engine has, the less boost it reads on a boost guage. Boost is not "lost" after headers, the engine is simply no longer as restricted as it was before the headers.

08-30-2022, 11:38 PM	#25
asthmamax11 Drives: 1SS Summit White 6 speed Join Date: Jul 2017 Location: Gainesville GA Posts: 579	Thank you guys I think I need to brush up on basic engine physics Good info here __________________ 16 1SS M6 White Magnuson 2.3 Heartbeat Roto Fab Solo Performance Cat deletes and Axleback Hurst short shifter #'s coming soon Riaction coilovers 1LE sway bars BMR mm BMR chassis brace Flow one 19" wheels wrapped in Mickey Thompsons 02 Z28 M6 35th anniversary 80k miles T-tops Leather Bolt ons Joy to drive this classic every day! Daily Driver

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