Header Size with SC? - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

thump426er · 02-03-2011, 01:48 PM

Hey there, can't seem to find the answer in a search here so if there is a link to this question already can someone please post.

What is the ideal primary header size for a stock bore/stroke LS3 with a 2300 supercharger on it? Throwing a maggie on my car which I just purchased from Ted. I have gone through the header size thread testing that Ted did a while ago on a stock camaro showing three different header sizes but figure it may be different with a supercharger. Looked like 1 7/8" was the consensus for a street driven stocker.

My particular application is going to be only the maggie, CAI, and headers. Primary use is driver (fun driver

) but there will be the odd autocross and 1/4 mile runs though no more than a handful each year. oh,,,, and to beat my buddies Z06 in a roll on!!!

Mostly wondering if the 17/8" still has the capacity for the added flow or is a 2" the way to go when supercharged with my application and mods. Thanks for the input.

Darth_Emma · 02-03-2011, 02:15 PM

I got 1 7/8" LT Kooks headers with high-flow cats. My car has CAI and a maggie. I did a lot of research before deciding on my headers. I think the 1 7/8" is the way to go.

S-eatin-grin · 02-03-2011, 02:21 PM

If you are stopping at SC then 1 7/8 will be all you need. If you are going to keep building up...cam, heads, fuel, stroking the motor, pulley down....then get the 2" ones

thump426er · 02-03-2011, 11:51 PM

Quote:

Originally Posted by Darth_Emma

I got 1 7/8" LT Kooks headers with high-flow cats. My car has CAI and a maggie. I did a lot of research before deciding on my headers. I think the 1 7/8" is the way to go.

In your research what were some of the pros/cons of the 1 7/8" to the 2" for your application, because as it is now that's identical to what I'll be doing.

Quote:

Originally Posted by S-eatin-grin

If you are stopping at SC then 1 7/8 will be all you need. If you are going to keep building up...cam, heads, fuel, stroking the motor, pulley down....then get the 2" ones

I guess thats the kicker, as it is now what I've mentioned is all I'm planning. Pretty sure I won't do more though.

Just seems odd that a 2" wouldn't be needed because isn't it flowing the equivalent of a 500ci + motor with the charger? Looking at what most people seem to be doing is the 1 7/8" so must make sense to do that. Still learning and just curious as for me the price difference probably wouldn't warrant the 2's anyway.

Thanks for the input.

Kilo-9 · 02-04-2011, 12:14 AM

I plan on supercharging and a blower cam and I'm going with the 2" headers. If you look at Ted's test, the 2" did outperform the others and had no performance trade-offs. They are slightly more expensive, but I'd rather "future-proof" my build...especially since it doesn't cost anything performance-wise...just my .02

FloMoCamaro · 02-04-2011, 12:44 AM

I would go with the 2" - After all - they do give more power!!! - NA or SC...

S-eatin-grin · 02-05-2011, 08:46 PM

The difference in the 1 7/8 and 2" with forced induction is that you will see less boost with the larger headers due to less exhaust pressure. This can kinda limit power if the super charger is all that is added. If you add a bunch of other power makers then the 1 7/8 inch headers become limiting. If you are building for the future you can get the 2" and just just a smaller SC pulley to keep boost levels up until you add your other power makers...that's how I understand things at least....someone who knows more please feel free to step in

Z71456 · 02-06-2011, 12:12 AM

I just installed 1-7/8 ARH headers to compliment my Maggie and they did just that. From what I understand you can still go pretty big beyond this and they will be just fine. Don't know the negatives on going with 2" except for the loss in boost, but that can be made up for with a pulley change. I was told to go 1-7/8 by a few different tuners/builders so that's what I did. Car is a MONSTER now. Very happy.

Darth_Emma · 02-06-2011, 07:53 AM

The 1 7/8" lt headers are the perfect balance between air flow and back pressure with a sc. I don't claim to be an expert, but I think I did my homework on this. The 1 7/8" lts matcched with the 3.6" pulley on my maggie give me about 7 lbs of boost. If you are going to be going up to about 650 rwhp, then these headers are fine.

Larger headers will cause you to lose back pressure and lower your boost.

05gofast · 02-07-2011, 08:32 PM

2" Kooks & don't look back

02-03-2011, 01:48 PM	#1
thump426er Drives: Z06 Join Date: Jul 2010 Location: MT & AB Posts: 180	Header Size with SC? Hey there, can't seem to find the answer in a search here so if there is a link to this question already can someone please post. What is the ideal primary header size for a stock bore/stroke LS3 with a 2300 supercharger on it? Throwing a maggie on my car which I just purchased from Ted. I have gone through the header size thread testing that Ted did a while ago on a stock camaro showing three different header sizes but figure it may be different with a supercharger. Looked like 1 7/8" was the consensus for a street driven stocker. My particular application is going to be only the maggie, CAI, and headers. Primary use is driver (fun driver) but there will be the odd autocross and 1/4 mile runs though no more than a handful each year. oh,,,, and to beat my buddies Z06 in a roll on!!! Mostly wondering if the 17/8" still has the capacity for the added flow or is a 2" the way to go when supercharged with my application and mods. Thanks for the input.

02-04-2011, 12:14 AM	#5
Kilo-9 Dog Is My Copilot Drives: 2011 2SS/RS LS3 Join Date: Jun 2009 Location: Pittsburgh, PA Posts: 1,394	I plan on supercharging and a blower cam and I'm going with the 2" headers. If you look at Ted's test, the 2" did outperform the others and had no performance trade-offs. They are slightly more expensive, but I'd rather "future-proof" my build...especially since it doesn't cost anything performance-wise...just my .02 __________________

02-04-2011, 12:44 AM	#6
FloMoCamaro Drives: 2010 Camaro SS Join Date: Dec 2009 Location: Flower Mound, TX Posts: 490 View My Garage	I would go with the 2" - After all - they do give more power!!! - NA or SC... __________________

02-06-2011, 12:12 AM	#8
Z71456 Drives: Camaro Join Date: Dec 2009 Location: Buffalo, NY Posts: 152 View My Garage	I just installed 1-7/8 ARH headers to compliment my Maggie and they did just that. From what I understand you can still go pretty big beyond this and they will be just fine. Don't know the negatives on going with 2" except for the loss in boost, but that can be made up for with a pulley change. I was told to go 1-7/8 by a few different tuners/builders so that's what I did. Car is a MONSTER now. Very happy. __________________ Magnacharger TVS2300 / Roto-Fab CAI / ACT Twin-disc clutch + flywheel / Livernois Motorsports Duel Fuel Pump / Modified stock engine cover / ARH 1-7/8 Long Tube Headers + High Flow cats / Magnaflow 3" Cat-back / Eibach Springs / Pfadt Sway Bars / Stillen slotted/drilled rotors, hard lines and Hawk pads / Barton Short-Shifter / CBD Spoiler / GM Heritage Grill / Forgestar F14 20x11/20x9 Matte Black / Nitto NT05 Tires 565WHP/570TQ

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02-03-2011, 02:15 PM	#2
Darth_Emma Psssssssssshhhhhhhhhhhhh! Drives: under contruction Join Date: Nov 2009 Location: Marysville, Ohio Posts: 12,996 View My Garage	I got 1 7/8" LT Kooks headers with high-flow cats. My car has CAI and a maggie. I did a lot of research before deciding on my headers. I think the 1 7/8" is the way to go.

02-03-2011, 02:21 PM	#3
S-eatin-grin Drives: 2013 2SS/RS AGM Join Date: Nov 2010 Location: WV Posts: 1,170 View My Garage	If you are stopping at SC then 1 7/8 will be all you need. If you are going to keep building up...cam, heads, fuel, stroking the motor, pulley down....then get the 2" ones

02-05-2011, 08:46 PM	#7
S-eatin-grin Drives: 2013 2SS/RS AGM Join Date: Nov 2010 Location: WV Posts: 1,170 View My Garage	The difference in the 1 7/8 and 2" with forced induction is that you will see less boost with the larger headers due to less exhaust pressure. This can kinda limit power if the super charger is all that is added. If you add a bunch of other power makers then the 1 7/8 inch headers become limiting. If you are building for the future you can get the 2" and just just a smaller SC pulley to keep boost levels up until you add your other power makers...that's how I understand things at least....someone who knows more please feel free to step in

02-06-2011, 07:53 AM	#9
Darth_Emma Psssssssssshhhhhhhhhhhhh! Drives: under contruction Join Date: Nov 2009 Location: Marysville, Ohio Posts: 12,996 View My Garage	The 1 7/8" lt headers are the perfect balance between air flow and back pressure with a sc. I don't claim to be an expert, but I think I did my homework on this. The 1 7/8" lts matcched with the 3.6" pulley on my maggie give me about 7 lbs of boost. If you are going to be going up to about 650 rwhp, then these headers are fine. Larger headers will cause you to lose back pressure and lower your boost.

02-07-2011, 08:32 PM	#10
05gofast Drives: Something Fast Join Date: Feb 2010 Location: NC Posts: 32	2" Kooks & don't look back