Here we go. Stepped headers or uniform size? - Page 2 - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

MarylandSpeed · 10-15-2011, 01:53 PM

1 7/8" stepped to 2" is not good for most cars. One of the way's a stepped header works is kind of like pinching a hose. Basically the smaller diameter primary pressurizes the exhaust gas. Then the bigger 1 7/8" primary allows the header to flow higher exhaust volume. The head port is less than 1 5/8"..so an initial 1 7/8" primary is too big to create the "pinch" effect on the exhaust gas. We run 1 3/4" stepped to 1 7/8" on our supercharged 2010 car..and before the new 417 we just put in, it made 635 rwhp

Kilo-9 · 10-15-2011, 04:55 PM

I'm assuming you stayed with the 1 3/4-1 7/8 stepped after the 417, too?

MarylandSpeed · 10-15-2011, 06:13 PM

Quote:

Originally Posted by Kilo-9

I'm assuming you stayed with the 1 3/4-1 7/8 stepped after the 417, too?

Yup, Getting ready to redyno it next week. As stated above..they exhaust port is less than 1 5/8". I don't see how having 7-8" of Primary being 1 3/4" could be a restriction.

Ravener · 10-17-2011, 02:09 PM

I'm running Kook's stepped headers (Installed by Brandon's shop no less)and they were worth the cost for me.

Raptor626 · 10-17-2011, 02:46 PM

Quote:

Originally Posted by Ravener

I'm running Kook's stepped headers (Installed by Brandon's shop no less)and they were worth the cost for me.

What size steps are you running?

MarylandSpeed · 10-18-2011, 04:40 PM

Quote:

Originally Posted by Raptor626

What size steps are you running?

He has 1 3/4" stepped to 1 7/8"

Ravener · 10-19-2011, 01:05 PM

Yeah what he said

bannonm · 10-25-2011, 10:34 PM

Quote:

Originally Posted by MarylandSpeed

My personal experiance is that a stepped header makes more power in pretty much every application we have tried it as long as it has been set up right.

What do you mean by "as long as it has been set up right"? Are you referring to the way it is made, or installed and tuned?

Raptor626 · 10-25-2011, 10:56 PM

He means that the steps need to be placed in precise locations relative to the exhaust ports.

14pilot · 10-25-2011, 11:25 PM

Pipe Diameters largely effect the exhaust blow down event when the valve opens and the high pressure gases rush out of the cylinder. The pipe lengths primarily effect the RPM range of the power band. The steps primary effect is on the wave scavenging effect of the gases after blow down ends.

So...

I plug the stock LS3 specs into my engine simulation software and get this:

Primaries:
First Step off the head - 1.625" dia. by 11" long
Second Step - 1.75" dia. by 8" long
Third Step - 2" dia. by 8" long

Collector:
2.625" choke point tapering out to 3.5" over 18" in length

Simulator says this would make 410 rwhp.

Anyone wanna build these and dyno them to check my math? LOL!!!

Raptor626 · 10-26-2011, 03:19 AM

^^ Ehh, I think they're worth it, especially when you decide to step up the mods.

WheelmanSS · 10-26-2011, 02:43 PM

I went with stepped Kook's, coated. Definitely happy with my setup. Currently N/A, but will be going FI next year, and the header will be great for both applications.

+1 for Maryland Speed's awesomeness too.

Raptor626 · 10-26-2011, 02:46 PM

Quote:

Originally Posted by WheelmanSS

I went with stepped Kook's, coated. Definitely happy with my setup. Currently N/A, but will be going FI next year, and the header will be great for both applications.

+1 for Maryland Speed's awesomeness too.

Nice. Yea, it seems as though MarylandSpeed's gonna be my one stop shop. Amazing deals, gifts, and prices.

WheelmanSS · 10-26-2011, 03:14 PM

Quote:

Originally Posted by Raptor626

Nice. Yea, it seems as though MarylandSpeed's gonna be my one stop shop. Amazing deals, gifts, and prices.

Yup.... Now if only they would step-up and offer me an awesome supercharger setup at a great price for years and years of shopping with them and being a loyal customer...

:emoticon7:

wink wink

10-15-2011, 04:55 PM	#16
Kilo-9 Dog Is My Copilot Drives: 2011 2SS/RS LS3 Join Date: Jun 2009 Location: Pittsburgh, PA Posts: 1,394	I'm assuming you stayed with the 1 3/4-1 7/8 stepped after the 417, too? __________________

10-17-2011, 02:09 PM	#18
Ravener Drives: 2010 2SS RS M6 Blk Join Date: Jul 2010 Location: Md Posts: 287	I'm running Kook's stepped headers (Installed by Brandon's shop no less)and they were worth the cost for me. __________________ 418 LS3, custom cam, tuned vararam, ported tb, Kooks stepped LT's, Kooks Hi-Flo cats and 2.5" street sleeper cat back, 18% UDP, crap stock rear tire size 12.03 @ 117 mph.

10-19-2011, 01:05 PM	#21
Ravener Drives: 2010 2SS RS M6 Blk Join Date: Jul 2010 Location: Md Posts: 287	Yeah what he said __________________ 418 LS3, custom cam, tuned vararam, ported tb, Kooks stepped LT's, Kooks Hi-Flo cats and 2.5" street sleeper cat back, 18% UDP, crap stock rear tire size 12.03 @ 117 mph.

10-26-2011, 02:43 PM	#26
WheelmanSS Logic is dead Drives: 2010 Camaro 2SS/RS Join Date: May 2010 Location: Chicago, IL Posts: 1,804	I went with stepped Kook's, coated. Definitely happy with my setup. Currently N/A, but will be going FI next year, and the header will be great for both applications. +1 for Maryland Speed's awesomeness too. __________________ 2010 Camaro 2SS/RS (LS3) 573 RWHP 498 RWTQ - Vortech V3 Supercharger - Kooks Stepped Headers, Magnaflow 16580 - Suspension by Pfadt, Hotchkis. 2007 Trailblazer SS- Sold 2001 Trans Am WS6 431 RWHP 408 RWTQ - Sold 1994 Camaro Z28 - Sold

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10-15-2011, 01:53 PM	#15
MarylandSpeed Account Suspended Drives: 2012 ZL1 & 2010 2SS/RS Join Date: Jul 2009 Location: Maryland Posts: 3,378	1 7/8" stepped to 2" is not good for most cars. One of the way's a stepped header works is kind of like pinching a hose. Basically the smaller diameter primary pressurizes the exhaust gas. Then the bigger 1 7/8" primary allows the header to flow higher exhaust volume. The head port is less than 1 5/8"..so an initial 1 7/8" primary is too big to create the "pinch" effect on the exhaust gas. We run 1 3/4" stepped to 1 7/8" on our supercharged 2010 car..and before the new 417 we just put in, it made 635 rwhp

10-25-2011, 10:56 PM	#23
Raptor626 Account Suspended Drives: 2011 Camaro SS Summit White Join Date: Apr 2010 Location: Astoria, New York Posts: 796	He means that the steps need to be placed in precise locations relative to the exhaust ports.

10-26-2011, 03:19 AM	#25
Raptor626 Account Suspended Drives: 2011 Camaro SS Summit White Join Date: Apr 2010 Location: Astoria, New York Posts: 796	^^ Ehh, I think they're worth it, especially when you decide to step up the mods.