[Z06] Bolt ons, how much hp?
Racer
Joined: Oct 2006
Posts: 286
Likes: 18
From: Rochester MI
Well, here is real life experience and professionals which disagree that bigger is better.
http://ls1tech.com/forums/generation...xperience.html
http://ls1tech.com/forums/generation...xperience.html
Drifting
Joined: Nov 2011
Posts: 1,377
Likes: 41
From: Chesterfield (St. Louis) MO
Well, here is real life experience and professionals which disagree that bigger is better.
http://ls1tech.com/forums/generation...xperience.html
http://ls1tech.com/forums/generation...xperience.html
Racer
Joined: Oct 2006
Posts: 286
Likes: 18
From: Rochester MI
Not gonna argue any more as people will buy and run whatever "they believe" is better. If you believe a larger header on a pretty much stock bolt on c5 is better then the appropriate 1 3/4 header that's your business.
Drifting
Joined: Apr 2008
Posts: 1,464
Likes: 32
From: Ocala FL
Well, here is real life experience and professionals which disagree that bigger is better.
http://ls1tech.com/forums/generation...xperience.html
http://ls1tech.com/forums/generation...xperience.html
They make so similar hp numbers it's ridiculous. Google "dyno numbers c5 Z06" and you will find threads of people posting their numbers.
As I did early, people had almost identical results with similar mods but different size headers than I did. Certainly, not 10 hp+ differences.
The way I understood it when I was shopping around prior to install was 1 3/4 was better for mid-range and around town torque. 1 7/8 would be better for peak hp and high rpm applications such as Road Courses. I went with the 1 7/8 since mine spends most of the time in upper range.
For street driving I would have went with the 1 3/4.
Either way, the difference is negligible between the two until you start making serious power.
Last edited by JeremyGSU; Apr 1, 2014 at 03:03 PM.
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Safety Car
Joined: Oct 2003
Posts: 3,699
Likes: 16
From: Sun City- Menifee Calif.
I would hardly site ONE website comparing headers as the gospel. There are a TON of threads on this. Some companies have tested both back to back and made more power with the 1 7/8's, others not.
They make so similar hp numbers it's ridiculous. Google "dyno numbers c5 Z06" and you will find threads of people posting their numbers.
As I did early, people had almost identical results with similar mods but different size headers than I did. Certainly, not 10 hp+ differences.
The way I understood it when I was shopping around prior to install was 1 3/4 was better for mid-range and around town torque. 1 7/8 would be better for peak hp and high rpm applications such as Road Courses. I went with the 1 7/8 since mine spends most of the time in upper range.
For street driving I would have went with the 1 3/4.
Either way, the difference is negligible between the two until you start making serious power.
They make so similar hp numbers it's ridiculous. Google "dyno numbers c5 Z06" and you will find threads of people posting their numbers.
As I did early, people had almost identical results with similar mods but different size headers than I did. Certainly, not 10 hp+ differences.
The way I understood it when I was shopping around prior to install was 1 3/4 was better for mid-range and around town torque. 1 7/8 would be better for peak hp and high rpm applications such as Road Courses. I went with the 1 7/8 since mine spends most of the time in upper range.
For street driving I would have went with the 1 3/4.
Either way, the difference is negligible between the two until you start making serious power.
My 1 7/8 ARH gave the most sotp increase from 4500-5000 & up to my redline of 6800 Perfect for my 3.90 Z! Much easier to control wheelspin. Power doesn`t drop off at all before 6800. 
Safety Car
Joined: Feb 2013
Posts: 4,346
Likes: 755
From: Greensboro Nc
My car only made 360rwhp with 1 3/4, no cats, borla exhaust and a tune. I dyno'd with the zip tie mod, but I'm still pretty disappointed with the results. It drives great and all, but definitely not worth the money and time I have invested in it. The car made buckets of torque (385 to the rear wheels). I've seen stock cars produce better number than mine..
Drifting
Joined: Jan 2014
Posts: 1,285
Likes: 164
From: MA
My car only made 360rwhp with 1 3/4, no cats, borla exhaust and a tune. I dyno'd with the zip tie mod, but I'm still pretty disappointed with the results. It drives great and all, but definitely not worth the money and time I have invested in it. The car made buckets of torque (385 to the rear wheels). I've seen stock cars produce better number than mine..
Drifting
Joined: Nov 2011
Posts: 1,377
Likes: 41
From: Chesterfield (St. Louis) MO
I agree, the numbers don't make sense at all. Typically, an LS6 with those mods should make more HP than TQ if tuned correctly (and the HP to TQ ratio doesn't really have anything to do with the type of dyno, unless there is some issue with the dyno).
Melting Slicks
Joined: May 2009
Posts: 3,110
Likes: 285
From: Rio Rancho New Mexico
My car only made 360rwhp with 1 3/4, no cats, borla exhaust and a tune. I dyno'd with the zip tie mod, but I'm still pretty disappointed with the results. It drives great and all, but definitely not worth the money and time I have invested in it. The car made buckets of torque (385 to the rear wheels). I've seen stock cars produce better number than mine..
My 04 Z06 made 359RWHP BONE stock...
Drifting
Joined: Jan 2014
Posts: 1,285
Likes: 164
From: MA
My 03 made 365hp/358hp w/ just a vararam & tune on a VERY stingy mustang dyno, and I agree that especially w/ headers you should be making more HP than torque anyhow, there's something wrong w/ the tune or the dyno or both....but I'd guess more to do w/ the tune because the torque # is still strong.
Tech Contributor
Joined: Jan 2004
Posts: 20,030
Likes: 289
From: Wylie TX --> Less is More, except under the hood !
Most I have seen are around 390rwhp 380rwtq.
Just what LG's told me back in the day ...
Toque
Drifting
Joined: Jan 2014
Posts: 1,285
Likes: 164
From: MA
OK but think about it - no cats and headers and you're putting down worse numbers than WITH cats and cast irony manifolds? Makes no sense with or without a bottleneck.