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Old 02-16-2016, 09:49 AM   #1
JohnMatt
 
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How much am I losing with my headers?

I recently picked up a 12 ZL1 with headers, off road mids and an upper pulley which I can only assume is a 2.55 from the 10-11 psi I'm seeing. My question is are the 1 3/4 SLP headers holding me back any at all? If it were me I would have gone with at least a 1 7/8 or probably a 2" Primary
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Old 02-18-2016, 05:10 PM   #2
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You would gain a minimum of 20 rwhp adding 2" headers. And that's on the conservative side. Anyone buying headers for a ZL1 should get the 2"
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Old 02-20-2016, 08:54 AM   #3
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Thanks for the reply. I could see gaining that much
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Old 02-20-2016, 10:35 AM   #4
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From the 1 7/8" to 2" primaries I couldn't see more than maybe 5 hp at the absolute most. I can't speak on behalf of your 1 3/4" but I know from 1 7/8" to 2" can't possibly be much.
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Old 02-20-2016, 10:38 AM   #5
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http://www.camaro5.com/forums/showthread.php?t=63640

Not LSA but still addresses the question asked.
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Old 02-20-2016, 10:44 AM   #6
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Quote:
Originally Posted by 2013 ZL1 #7860 View Post
http://www.camaro5.com/forums/showthread.php?t=63640

Not LSA but still addresses the question asked.
That's right about what I figured. I know the SS cars respond better to headers than the ZL1 does too so odds are good the difference wouldn't even be that big on a ZL1.


A quote from a different thread from Andy@livernois "1 7/8 from stock until around 750-800rwhp, after that, 2"
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Old 02-24-2016, 07:59 AM   #7
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Quote:
Originally Posted by jayno20 View Post
That's right about what I figured. I know the SS cars respond better to headers than the ZL1 does too so odds are good the difference wouldn't even be that big on a ZL1.


A quote from a different thread from Andy@livernois "1 7/8 from stock until around 750-800rwhp, after that, 2"
How do you "know" that?

Headers become more important and effective with more power, not less.
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Old 02-24-2016, 12:37 PM   #8
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Quote:
Originally Posted by 2013 ZL1 #7860 View Post
How do you "know" that?

Headers become more important and effective with more power, not less.
I was pretty sure I read that somewhere on this forum, but looking for that information now is proving difficult. I assumed after hearing it that maybe the SS had a more restrictive header/exhaust setup but maybe I read it wrong.

I know headers are needed more with more power of course that makes sense, but if the stock system on the ZL1 flows better than the SS then aftermarket headers would provide a higher horsepower gain if it replaces a more restrictive system. That was my thought, but again, I can't find anything backing that up anymore...
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Old 02-24-2016, 07:44 PM   #9
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Quote:
Originally Posted by jayno20 View Post
I was pretty sure I read that somewhere on this forum, but looking for that information now is proving difficult. I assumed after hearing it that maybe the SS had a more restrictive header/exhaust setup but maybe I read it wrong.

I know headers are needed more with more power of course that makes sense, but if the stock system on the ZL1 flows better than the SS then aftermarket headers would provide a higher horsepower gain if it replaces a more restrictive system. That was my thought, but again, I can't find anything backing that up anymore...
Not sure on the header differences between LS3 and LSA but the exhaust is both 2.5" if that sheds any light on the topic. They didnt look special to me when I took them off.

I went with 2" on my ZL1 and would recommend others do as well.
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Old 02-25-2016, 07:07 AM   #10
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The manifolds from an LS3 and LSA look identical sitting side by side, and everything after those are the same if both cars have quad tip exhaust from factory. Although the LSA manifolds are Stainless Steel
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Old 02-25-2016, 02:13 PM   #11
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Are you sure the upper pulley is a 2.50/2.55? The reason I ask is I have a 2.50 upper pulley, LTs W/Cats, injectors and my car is making 15PSI on the boost gauge. They do make a couple of other pulley sizes 2.85, etc.
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Old 02-26-2016, 07:21 PM   #12
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From the chart I found I was assuming a 2.55 upper but I don't know 100%

Quote:
Originally Posted by m1key1111 View Post
Are you sure the upper pulley is a 2.50/2.55? The reason I ask is I have a 2.50 upper pulley, LTs W/Cats, injectors and my car is making 15PSI on the boost gauge. They do make a couple of other pulley sizes 2.85, etc.
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