Headers for an L99 Automatic.....17/8 or 1 3/4 ? - Page 2 - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Jekyll-N-Hyde · 07-30-2009, 11:22 AM

Quote:

Originally Posted by _GTO_

As far as I know and as I tested on the dyno on my friends cars , if your engine got bolts on or a cam the 1 3/4 will give you the best result , but if you got forced induction the 1 7/8 is absolutely the best for you .

What you just mentioned about bolt on and small stuff closest to stock needs 1 3/4 and forced induction and cammed needs 1 7/8 is what i have always thought also however this is what American Racing Headers
sent me in a e-mail.

I told them what I had and mentioned what you said up above and they replied with........

I would go 1-7/8 x 3 thats the system that selling currently. On a 346 cube motor I might say 1-3/4. but this motor is larger with better heads. your not going to loose bottom end. Both systems will gain dramatically over stock. The difference between both of our systems down low will fluctuate a minimal amount but the 1-7/8 will pull better from the middle up. We don't have a part number yet there is only really 2 systems we are pushing 1-7/8's with or without cats.

btw what would you say is a GM motor 346 Cubic inches ? wouldnt that be a 98 Camaro with a LS1 ?

he mentioned to me in my e-mail " On a 346 cube motor I might say 1-3/4. but this motor is larger with better heads. your not going to loose bottom end. "

rayhawk · 07-30-2009, 02:45 PM

Quote:

Originally Posted by MellowYellow

What you just mentioned about bolt on and small stuff closest to stock needs 1 3/4 and forced induction and cammed needs 1 7/8 is what i have always thought also however this is what American Racing Headers
sent me in a e-mail.

I told them what I had and mentioned what you said up above and they replied with........

I would go 1-7/8 x 3 thats the system that selling currently. On a 346 cube motor I might say 1-3/4. but this motor is larger with better heads. your not going to loose bottom end. Both systems will gain dramatically over stock. The difference between both of our systems down low will fluctuate a minimal amount but the 1-7/8 will pull better from the middle up. We don't have a part number yet there is only really 2 systems we are pushing 1-7/8's with or without cats.

btw what would you say is a GM motor 346 Cubic inches ? wouldnt that be a 98 Camaro with a LS1 ?

he mentioned to me in my e-mail " On a 346 cube motor I might say 1-3/4. but this motor is larger with better heads. your not going to loose bottom end. "

LS1 = 346 ci = 5.7L

I would go with the 1 7/8 if I were you.

aet08 · 07-27-2010, 07:24 PM

Everyone recommended a 1 7/8" for my L99, but you should be careful...
I'm thinking that maybe 1 3/4" might have been better for the L99

read this thread
http://www.camaro5.com/forums/showth...=1#post2150093

I only gained 20 HP going with 1 7/8" vs stock manifold

PQ · 07-27-2010, 07:27 PM

Quote:

Originally Posted by aet08

Everyone recommended a 1 7/8" for my L99, but you should be careful...
I'm thinking that maybe 1 3/4" might have been better for the L99

read this thread
http://www.camaro5.com/forums/showth...=1#post2150093

I only gained 20 HP going with 1 7/8" vs stock.

You should have given it a few more days, it would have been a year stale.

Just ordered Borla all the way back. Catless.

cybercoaster · 07-27-2010, 08:22 PM

I have 1 7/8 Kooks on mine with Borla ATAK and tune. I didnt get a dyno tune before some stupid reason ($). All I know is I love it. Hey J-N-H, you were at C5F?

2010 SSRS · 07-27-2010, 08:45 PM

Go with the 1 7/8, I have the JRE Street Package that was installed at Jannetty Racing which is the 1 7/8 Dynatech LT's.

URDAMAN · 07-27-2010, 08:55 PM

Here was my dyno sheet from May... 1 7/8, CAI, Axelback, cross over pipe, high flow cats you decide

Supercharged SS · 07-27-2010, 09:29 PM

I have the 1 3/4" on my 10 second L99. So whatever you choose you can't go wrong.

PQ · 07-27-2010, 10:25 PM

Quote:

Originally Posted by cybercoaster

I have 1 7/8 Kooks on mine with Borla ATAK and tune. I didnt get a dyno tune before some stupid reason ($). All I know is I love it. Hey J-N-H, you were at C5F?

Nope. He wussied out.

Ivan @ Southwest Speed · 07-27-2010, 11:33 PM

Doug Thorley Tri Y's For the Absolute WIN!!!

We carry a full line of Long Tubes from 4 different manufactures and when it comes down to it, I bet we sell the DT 1 3/4" Tri Y's 5:1 on any of my other 1 7/8"'s.

I've posted this before but it's hard to deny it when it's not from my shop, Doug Thorleys, or even someone who deals them.

Food for thought and smart money for sure.....

-Ivan

SGOS252382 · 07-28-2010, 06:37 AM

Some of the fastest bolt on L99s (Headers, intake, tune) are running 1 7/8 headers.

With 1 7/8 headers, intake, and tune I made over 50 ft lbs of torque on my L99.

JS · 07-28-2010, 10:32 PM

Up to 550RW a 1 3/4 is fine..
Boosted cars can benefit from 1 7/8

Nuff said

Jekyll-N-Hyde · 07-28-2010, 10:42 PM

Wow old old thread lol

I went with the 1 7/8 ARH and boy and I glad I did

After the Cam and higher compression

JS · 07-28-2010, 10:53 PM

Well talk is cheap, we went 10.20's@133 using a 1 3/4 on a 402 GTO
Oh and we switched to a 1 7/8 and picked up tee tee ;o)

07-27-2010, 08:45 PM	#20
2010 SSRS Drives: 3 V8 Camaros Join Date: May 2009 Location: The Ocean State Posts: 111,187 View My Garage	Go with the 1 7/8, I have the JRE Street Package that was installed at Jannetty Racing which is the 1 7/8 Dynatech LT's. __________________ Jannetty Racing JRE Street Package

07-27-2010, 08:55 PM	#21
URDAMAN Drives: 2010 IBM 2SS / RS Join Date: May 2010 Location: Augusta, GA Posts: 204 View My Garage	Here was my dyno sheet from May... 1 7/8, CAI, Axelback, cross over pipe, high flow cats you decide Last edited by URDAMAN; 10-06-2010 at 05:48 PM.

07-27-2010, 11:33 PM	#24
Ivan @ Southwest Speed Drives: '15 Z06, '01 NBM SS, '97 SS Join Date: May 2009 Location: Rio Rancho, NM Posts: 12,170	Doug Thorley Tri Y's For the Absolute WIN!!! We carry a full line of Long Tubes from 4 different manufactures and when it comes down to it, I bet we sell the DT 1 3/4" Tri Y's 5:1 on any of my other 1 7/8"'s. I've posted this before but it's hard to deny it when it's not from my shop, Doug Thorleys, or even someone who deals them. Food for thought and smart money for sure..... -Ivan Attached Images

07-28-2010, 10:32 PM	#26
JS Drives: 2010 Camaro SS Join Date: May 2010 Location: Phila,Pa. Posts: 557	Up to 550RW a 1 3/4 is fine.. Boosted cars can benefit from 1 7/8 Nuff said __________________ SOLD 2010 Camaro 1SS/A6 12.59@111.31 Magnaflow Magnapack Axleback & Resonated X-Pipe/OBX LT Headers/Airaid Cold Air Kit/Injection Connection Tuned

07-28-2010, 10:53 PM	#28
JS Drives: 2010 Camaro SS Join Date: May 2010 Location: Phila,Pa. Posts: 557	Well talk is cheap, we went 10.20's@133 using a 1 3/4 on a 402 GTO Oh and we switched to a 1 7/8 and picked up tee tee ;o) __________________ SOLD 2010 Camaro 1SS/A6 12.59@111.31 Magnaflow Magnapack Axleback & Resonated X-Pipe/OBX LT Headers/Airaid Cold Air Kit/Injection Connection Tuned

07-27-2010, 07:24 PM	#17
aet08 Drives: c Join Date: Feb 2010 Location: c Posts: 627	Everyone recommended a 1 7/8" for my L99, but you should be careful... I'm thinking that maybe 1 3/4" might have been better for the L99 read this thread http://www.camaro5.com/forums/showth...=1#post2150093 I only gained 20 HP going with 1 7/8" vs stock manifold

07-27-2010, 08:22 PM	#19
cybercoaster Drives: 2017 2SS 50th Anv, 1972 RS Join Date: Mar 2009 Location: Oklahoma City Posts: 1,588 View My Garage	I have 1 7/8 Kooks on mine with Borla ATAK and tune. I didnt get a dyno tune before some stupid reason ($). All I know is I love it. Hey J-N-H, you were at C5F?

07-27-2010, 09:29 PM	#22
Supercharged SS Account Suspended Drives: 2010 Camaro Join Date: Feb 2010 Location: Sandy Hook, CT Posts: 11,927	I have the 1 3/4" on my 10 second L99. So whatever you choose you can't go wrong.

07-28-2010, 06:37 AM	#25
SGOS252382 Drives: 2010 Camaro 2SS/RS Join Date: Mar 2008 Location: S.W. Florida Posts: 6,294	Some of the fastest bolt on L99s (Headers, intake, tune) are running 1 7/8 headers. With 1 7/8 headers, intake, and tune I made over 50 ft lbs of torque on my L99.

07-28-2010, 10:42 PM	#27
Jekyll-N-Hyde I put the FU back in FUN Drives: 1969 SS 396 , 2010 Camaro SS Join Date: Jun 2009 Location: Between Weatherford and Azle TX hway730 Posts: 2,129	Wow old old thread lol I went with the 1 7/8 ARH and boy and I glad I did After the Cam and higher compression

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