[Z06] Baseline Dyno Pulls Katech Torquer Part II; What the headers did.
11-07-2012, 06:48 PM
#1
Team Owner
Thread Starter
Baseline Dyno Pulls Katech Torquer Part II; What the headers did.
This is actually a continuation of my prior thread.
http://forums.corvetteforum.com/c6-z...h-torquer.html
In that thread I ultimately made the decision to add headers.
With the headers and the tuning now taken over by Ed Hutchings, the car is at 527.34 RWHP/492.75 RWTQ over the prior 508.02/482.81 with the stock manifolds.
Peak gains are impressive, but the real benefit of the headers, and what has made them well worth the money, is demonstrated at around 3500 -3700 RPM where there is a gain of 26.81 RWHP/ 38.05 lb/ft RWTQ over the stock manifolds. At 3750 RPM there is about a 40 RWTQ difference.....and yes, you can feel it.
There is a gain throughout the entire RPM range, as indicated in the comparison dyno chart.
So if anyone is wondering how much power I was leaving on the table by running the stock manifolds, the answers are below.
Torque curve flat enough to sit a beer on top of.
Look at what happens, with the horsepower and torque readings comparing the pulls with the stock manifolds vs with the headers, at any given RPM, but especially from about 3500RPM on in to 6800 RPM which is where we shut it down.
This is the "before", ie the setup without headers and using the stock manifolds with the best tune that we could get.
This is the "after", ie the setup with headers and following final tuning for the headers.
Modifications include
DRM Bilstein shocks
2008 axle shafts
MGW shifter
Katech LS9X clutch
Tick remote clutch bleeder
Callaway Honker CAI
Ported stock Throttle body
Ported stock intake manifold
Katech Torquer 110 Cam
Katech C5R Timing Chain
WCCH Stage 2 Cylinder Heads
KOOKS 1 7/8 headers X Pipe with Cats
NGK TR6 Spark plugs
Tuning by Ed Hutchings
http://forums.corvetteforum.com/c6-z...h-torquer.html
In that thread I ultimately made the decision to add headers.
With the headers and the tuning now taken over by Ed Hutchings, the car is at 527.34 RWHP/492.75 RWTQ over the prior 508.02/482.81 with the stock manifolds.
Peak gains are impressive, but the real benefit of the headers, and what has made them well worth the money, is demonstrated at around 3500 -3700 RPM where there is a gain of 26.81 RWHP/ 38.05 lb/ft RWTQ over the stock manifolds. At 3750 RPM there is about a 40 RWTQ difference.....and yes, you can feel it.
There is a gain throughout the entire RPM range, as indicated in the comparison dyno chart.
So if anyone is wondering how much power I was leaving on the table by running the stock manifolds, the answers are below.
Torque curve flat enough to sit a beer on top of.
Look at what happens, with the horsepower and torque readings comparing the pulls with the stock manifolds vs with the headers, at any given RPM, but especially from about 3500RPM on in to 6800 RPM which is where we shut it down.
This is the "before", ie the setup without headers and using the stock manifolds with the best tune that we could get.
This is the "after", ie the setup with headers and following final tuning for the headers.
Modifications include
DRM Bilstein shocks
2008 axle shafts
MGW shifter
Katech LS9X clutch
Tick remote clutch bleeder
Callaway Honker CAI
Ported stock Throttle body
Ported stock intake manifold
Katech Torquer 110 Cam
Katech C5R Timing Chain
WCCH Stage 2 Cylinder Heads
KOOKS 1 7/8 headers X Pipe with Cats
NGK TR6 Spark plugs
Tuning by Ed Hutchings
Last edited by '06 Quicksilver Z06; 05-17-2013 at 01:25 AM.
11-07-2012, 07:04 PM
#4
Team Owner
Thread Starter
Yes, you did.
You, Mopar Jimmy, Undy, Jorday, Brian at RPT, Johnbell2, 2000FRCZ19, and several others.
As a matter of fact, Jorday, even accurately estimated the peak difference.
http://forums.corvetteforum.com/1582046586-post129.html
I thank my lucky stars that I ultimately listened to you, because you were dead right.
I don't have to tell you, that at around 3200RPM, you can really feel the difference.
I would advise anyone going this route to go ahead and add the headers.
Last edited by '06 Quicksilver Z06; 11-07-2012 at 07:08 PM.
11-07-2012, 07:16 PM
#8
Le Mans Master
Awesome numbers must be a blast to drive.
11-07-2012, 07:30 PM
#10
Team Owner
Thread Starter
11-07-2012, 07:42 PM
#12
Team Owner
Thread Starter
Yes, 1 7/8 I should add that too.
I'll tell you, headers have come a long way since my C6 days.
KOOKS did an excellent job with the fitment, the welds are perfect, there is already an 02 bung in the front of the X pipe for a wide band.
The headers, a part that I was dead set against, has become one of the most crucial pieces to the entire "puzzle".
One can definitely see that the car is better off for them. And not just at the higher RPM ranges, but of course there too.
11-07-2012, 07:48 PM
#14
Team Owner
Thread Starter
Ed has done a fantastic job with the tuning.
The fact that he and Mike already had somewhat of a prior working relationship helped a lot too.
Ed is a forum member here as well. Ed sent me a base tune while he was out of town, and we went from there. He made himself available to make revisions as the car was on the dyno and did so.
It took a little while emailing back and forth the data logs and the run files, because he was not physically present, while the car was strapped down, but we got it dialed in. That's service that cost a little more, and of course you will need HP Tuners, if you don't already have it, but is well worth it. The A/F ratios are safe, as is the rest of the tune, the power under the curve is impressive, as is the peak power and torque, and the power and torque in the lower RPM ranges.
The car is even more fun to drive on the street now than it was before.
Last edited by '06 Quicksilver Z06; 11-07-2012 at 08:39 PM.
11-07-2012, 08:05 PM
#17
Team Owner
Thread Starter
To stock power, honestly there is no comparison. To call it night and day would be understatement.
I am on the runflats, and yes, it will easily break traction from a 50 MPH roll if you kick it.
That particular cam, makes a good bit of it's power lower in the RPM range than some of the others out there.
Even before the headers and when it was on the stock manifolds, it was making 420 lb/ft of torque at 3000 RPM. That was part of why I didn't think I needed headers. Boy, was I wrong.
So even then it easily would break the tires loose.
Now of course, in the RPM ranges that you are usually going to be driving at on the street, 3500 and up, it's making even more power and torque.
It is an outright blast to drive.
If you look at that dynograph, the blue line vs the red line throughout, the gains across the board are nothing short of amazing.
Last edited by '06 Quicksilver Z06; 11-07-2012 at 08:09 PM.
11-07-2012, 08:08 PM
#18
Melting Slicks
Yes, you did.
You, Mopar Jimmy, Undy, Jorday, Brian at RPT, Johnbell2, 2000FRCZ19, and several others.
As a matter of fact, Jorday, even accurately estimated the peak difference.
http://forums.corvetteforum.com/1582046586-post129.html
I thank my lucky stars that I ultimately listened to you, because you were dead right.
I don't have to tell you, that at around 3200RPM, you can really feel the difference.
I would advise anyone going this route to go ahead and add the headers.
You, Mopar Jimmy, Undy, Jorday, Brian at RPT, Johnbell2, 2000FRCZ19, and several others.
As a matter of fact, Jorday, even accurately estimated the peak difference.
http://forums.corvetteforum.com/1582046586-post129.html
I thank my lucky stars that I ultimately listened to you, because you were dead right.
I don't have to tell you, that at around 3200RPM, you can really feel the difference.
I would advise anyone going this route to go ahead and add the headers.
That is one FAT torque curve! You can't be anything but really happy with that graph right there! From 3500 rpm the car probably takes off like it was rear ended by a garbage truck now. 
It always surprises me when I see posts from guys saying that headers aren't worth it, because I think one could make a convincing argument that they are among the best bolt on upgrades available for the C6 Z06.
