Z06 manifold hype
Burning Brakes
Joined: Jan 2003
Posts: 1,150
Likes: 2
From: League City tx
your best is 12.14http://forums.corvetteforum.com/show...postcount=2470
and thats with cutting 1.8 60'ft, your mph was 114
......and thats where LG's & Vararam come in 
that gets you the extra 8mph at the traps and puts you (w/your great 60'ft time) in the mid/high 11'sYou know what you arent worth arguing with, but if you would read, i said my 06, not my 07. It ran 12.04 at 114.
Look a little higher on the list. you will see me again.
For your reading pleasure, here is a link to the page with my 06 numbers
http://forums.corvetteforum.com/show...893326&page=14
And 121-122 MPH on an LS2 with Vararam and Headers?? No, i dont think so.
You also have an LS3 not an LS2, so there are more differences there. Bottom line, Im happy with the stuff Ive done, and You should be too, but you really dont need to be so pompous and tell everyone else their stuff sucks because it didnt cost 1800.
Thats my 2 Cents
Here is link to the sound clip thread for those who asked for it
http://forums.corvetteforum.com/show....php?t=1951251
Daren
Last edited by 06C6FVR; Feb 25, 2008 at 07:36 PM.
Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
The information gathered from this thread is that Headers (LG lt or similar) do give you a substantial gain but approximately 50% of that gain is from the tune(from Katech's educated guess). Therefore, of the 40 rwhp gained (for purposes of this hypothetical let's say the average gain is 40 rwhp), half or 20 rwhp is from the header and the other half is from the tune.
The question I have is this, a stock c6 (without any mods) can be tuned and deliver 15 rwhp. I don't think anyone will question that the z06 exhaust manifold flows better than a c6 ls2 or ls3 manifold. If the z06 exhaust manifold adds even 10 rwhp (as a result of less restrictive flow), then with the improved tune should there not be a 25+ rwhp gain. I say 25+ because there will be a 15 rwhp tuning gain anyway. There should also be an additional gain (albeit smaller) for tuning the engine to run with the larger z06 exhaust manifold.
Seems to me, the way to resolve this would be to get a stock car and 1. Dyno it.
2. Then tune the car and dyno it.
Now we have a tuned car baseline.
3. Then add headers and dyno it.
Subtract tuned car dyno from header dyno to get header gain (or loss) on the tuned car (I guess since the original tuning is done with the stock manifolds it is possible that the tuning of the car for those manifolds may actually be detrimental when the headers are put on the car and the tune causes a loss of power.
4. Now tune the car with headers. Dyno it. Subtract the value of previous dyno, then we can tell how much the car gained with the headers and tune.
Of course, if you really want to get a complete picture, we could reflash the car back to the stock tune and redo the entire operation with the exception of the tune in 2. This will serve to tell us whether the stock cars tune helps or hurts the headers.
One last thing to remember, dyno pulls, even on the same day do provide different numbers so unless all variables (engine temperature, fluid temperature etc.) are accounted for there will be certain minor amount of uncertainty over the actual numbers.
Appreciate any comments.
The question I have is this, a stock c6 (without any mods) can be tuned and deliver 15 rwhp. I don't think anyone will question that the z06 exhaust manifold flows better than a c6 ls2 or ls3 manifold. If the z06 exhaust manifold adds even 10 rwhp (as a result of less restrictive flow), then with the improved tune should there not be a 25+ rwhp gain. I say 25+ because there will be a 15 rwhp tuning gain anyway. There should also be an additional gain (albeit smaller) for tuning the engine to run with the larger z06 exhaust manifold.
Seems to me, the way to resolve this would be to get a stock car and 1. Dyno it.
2. Then tune the car and dyno it.
Now we have a tuned car baseline.
3. Then add headers and dyno it.
Subtract tuned car dyno from header dyno to get header gain (or loss) on the tuned car (I guess since the original tuning is done with the stock manifolds it is possible that the tuning of the car for those manifolds may actually be detrimental when the headers are put on the car and the tune causes a loss of power.
4. Now tune the car with headers. Dyno it. Subtract the value of previous dyno, then we can tell how much the car gained with the headers and tune.
Of course, if you really want to get a complete picture, we could reflash the car back to the stock tune and redo the entire operation with the exception of the tune in 2. This will serve to tell us whether the stock cars tune helps or hurts the headers.
One last thing to remember, dyno pulls, even on the same day do provide different numbers so unless all variables (engine temperature, fluid temperature etc.) are accounted for there will be certain minor amount of uncertainty over the actual numbers.
Appreciate any comments.
<-with everything said in the above post. I would like to run that experiment, but my car is hybernating in a garage surrounded by 300" of snow. In short, I can't do any of it, until spring.
Pro
Joined: Jul 2006
Posts: 552
Likes: 28
From: North Las Vegas Nevada
Good Comparison Numbers
When I thought about upgrading to a LS7 Z06 exhaust SYSTEM I wanted a good comparison of actual gains. My stock 2006 A6 with only a K&N CAI was dyno tuned. Results were 343 RWHP. Two month later I installed LS7 Z06 manifolds, Cats, H-pipe and Corsa Z06 Sport mufflers. The differences in the internal size between the two systems is significant. Results 373 RWHP. I used the same dyno, same tuner, and engine fluids/gasoline. The temperatures, pressure altitudes, and humidities were slightly different, but a correction factor was used so a reasonable comparison could be made. There are several C6 A6 Corvettes with long tube headers, high flow Cats, upgraded H or X pipes, CAI, and aftermaket mufflers in the local Corvette Club and they dyno very closely to my final 373 RWHP on the same dyno.
After reading all of the various and sometimes humorous inputs I think the following would apply:
1. Quality long tube header systems on a Z06 will produce more horsepower and torque than a stock exhaust system. This is especially true on a modified engine.
2. Stock Z06 NPP mufflers seem to produce about the same levels of performance as aftermarket Z06 mufflers.
3. A complete LS7 Z06 exhaust SYSTEM on a LS2 or LS3 will produce horsepower levels approaching long tube headers systems.
4. If you had to purchase a complete LS7 Z06 exhaust system from the dealer, I suspect the cost would exceed the cost of a quality long tube header exhaust system.
5. If you can get a Z06 exhaust system for a good price, say 1/2 or less the price of a quality set of long tubes, it is a good upgrade for all the reasons listed throughout this thread.
This was an entertaining, informational, and thought provoking thread--Thanks Spin
After reading all of the various and sometimes humorous inputs I think the following would apply:
1. Quality long tube header systems on a Z06 will produce more horsepower and torque than a stock exhaust system. This is especially true on a modified engine.
2. Stock Z06 NPP mufflers seem to produce about the same levels of performance as aftermarket Z06 mufflers.
3. A complete LS7 Z06 exhaust SYSTEM on a LS2 or LS3 will produce horsepower levels approaching long tube headers systems.
4. If you had to purchase a complete LS7 Z06 exhaust system from the dealer, I suspect the cost would exceed the cost of a quality long tube header exhaust system.
5. If you can get a Z06 exhaust system for a good price, say 1/2 or less the price of a quality set of long tubes, it is a good upgrade for all the reasons listed throughout this thread.
This was an entertaining, informational, and thought provoking thread--Thanks Spin
Last edited by Vegas Panton; Feb 25, 2008 at 07:26 PM. Reason: Wording
Melting Slicks
Joined: May 2006
Posts: 2,891
Likes: 1
From: NJ..."the way I saw it, everyone takes a beating sometimes."
Headers are an obvious and proven mod. Z manifolds/exhaust need more test results to make their claims of 50-80% of gains from LTs accepted by the majority. In either case we are going to mod our cars as we see fit. So until more results are shown there's not much left in this thread........
Team Owner
Joined: Mar 2003
Posts: 96,496
Likes: 82
St. Jude Donor '03 through '17
I think the opinions are varied with both sides making good arguments. Unfortunately we have passed the point of factual information sharing and we have moved on to mere speculation at this point.
Headers are an obvious and proven mod. Z manifolds/exhaust need more test results to make their claims of 50-80% of gains from LTs accepted by the majority. In either case we are going to mod our cars as we see fit. So until more results are shown there's not much left in this thread........
Headers are an obvious and proven mod. Z manifolds/exhaust need more test results to make their claims of 50-80% of gains from LTs accepted by the majority. In either case we are going to mod our cars as we see fit. So until more results are shown there's not much left in this thread........
