New install E-Force LS2
Tech Contributor
Joined: May 2005
Posts: 15,575
Likes: 118
From: Conroe Texas
Me too.
An LS-3 with headers got barely better HP/Torque than my LS-2 without headers.
http://forums.corvetteforum.com/c6-f...r-ls2-now.html
Both systems installed/tuned by EG in similar conditions.
An LS-3 with headers got barely better HP/Torque than my LS-2 without headers.
http://forums.corvetteforum.com/c6-f...r-ls2-now.html
Both systems installed/tuned by EG in similar conditions.
Instructor
Joined: Nov 2009
Posts: 145
Likes: 0
From: Peachland British Columbia
Very nice write up, keep up the post, alot of us are gaining valuable information. THANK YOU
Safety Car
Joined: Oct 2006
Posts: 3,602
Likes: 3
From: Cincinnati OH
In other words, as the pump efficiency decreases, the fuel volume under load (say... laying on the pedal!) will tend to drop off because the pump can't keep up. Thus, the computer tells the injectors to stay open longer to get more fuel into the cylinder (because of less volume) and is an indicator of pump efficiency.
Unfortunately, fuel VOLUME is not the same as PSI - so mounting a PSI guage on the rail is also an indicator, but perhaps not the best solution either (it's hard to read when you're going 90mph!).
PS Post more photos.
Thread Starter
Le Mans Master
Joined: Dec 2005
Posts: 7,753
Likes: 210
From: North Western Connecticut
You may want to make a baseline note of what your injector duty cycles and pulse width are (as well as long-term fuel trims) - if these spike up over a short period it would be suggestive of fuel problems.
In other words, as the pump efficiency decreases, the fuel volume under load (say... laying on the pedal!) will tend to drop off because the pump can't keep up. Thus, the computer tells the injectors to stay open longer to get more fuel into the cylinder (because of less volume) and is an indicator of pump efficiency.
Unfortunately, fuel VOLUME is not the same as PSI - so mounting a PSI guage on the rail is also an indicator, but perhaps not the best solution either (it's hard to read when you're going 90mph!).
PS Post more photos.
In other words, as the pump efficiency decreases, the fuel volume under load (say... laying on the pedal!) will tend to drop off because the pump can't keep up. Thus, the computer tells the injectors to stay open longer to get more fuel into the cylinder (because of less volume) and is an indicator of pump efficiency.
Unfortunately, fuel VOLUME is not the same as PSI - so mounting a PSI guage on the rail is also an indicator, but perhaps not the best solution either (it's hard to read when you're going 90mph!).
PS Post more photos.
Ok.. excellent info. I will do just that as it's easy to program the gauge which can also log that data. Edlebrock is using 52 lb injectors for my setup which shouldn't present a problem for the stock pump. I'm going to program the gauge tonight to look at the data you suggest. You can also set it to STROBE (has 2 very small leds) for warning based on any parameters or deviation you set. I do have a few pics during the install but plan on posting some when i get my new CCW's and 325's mounted up....
Thread Starter
Le Mans Master
Joined: Dec 2005
Posts: 7,753
Likes: 210
From: North Western Connecticut
I'm tell you however it's all in the tune... These things are all but worthless with having a really good tuner and Doug IMO is one of the best around.....
Safety Car
Joined: Oct 2006
Posts: 3,602
Likes: 3
From: Cincinnati OH
Ok.. excellent info. I will do just that as it's easy to program the gauge which can also log that data. Edlebrock is using 52 lb injectors for my setup which shouldn't present a problem for the stock pump. I'm going to program the gauge tonight to look at the data you suggest. You can also set it to STROBE (has 2 very small leds) for warning based on any parameters or deviation you set. I do have a few pics during the install but plan on posting some when i get my new CCW's and 325's mounted up....
I should preface my other posts by saying: I sincerely doubt you're going to have Pump issues ANY time in the near future. But since that was a concern of yours initially I wanted to expand slightly.
Also, the parameters I mentioned are really only effective in closed-loop (normal/aggressive driving) conditions. IIRC, when you floor it wide-open (drag strip, for example), the computer reverts back to baseline parameters not seen with your scanner; but the tuners can chime in if that has changed with the newer cars.
In either case - I would just get an idea where your at while you know everything is healthy. A few years and a few thousand miles from now, if you start suspecting problems... THEN you can come back and try to figure things out.
Race Director
Joined: May 2007
Posts: 10,805
Likes: 706
From: Feverish All Over
Love this set up cause she can be real quiet for long trips or open for a more agressive sound. I know plenty of guys who have had header installs only to regret the too-loud sound and heat soak you get from them.
Don't know if a Z06 exhaust on an LS2 or LS3 gives the same flow as headers would, but the set up sounds better than stock, is quieter than headers and costs less.
vetfever
Race Director
Joined: Oct 2005
Posts: 14,555
Likes: 1,255
From: Saint Albans, WV
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Safety Car
Joined: Sep 2007
Posts: 3,502
Likes: 82
My observation has been that headers do allow more mechanical noise to be heard...primarily valve train. The mechanical noise is a by-product of the thinner tubes. Headers combined with free flow cats will also increase exhaust volume some...not really perceptible when my NPPs are closed though. Stay away from the temptation of the Gaybay Whang Chu el' cheapo headers...you get what you pay for! BUY AMERICAN! 
Also, spend the extra bucks and get them JetHot coated to help with the underhood heat. A side benefit of installing headers is that you move those two furnaces (a.k.a. stock catalytic converters) out from under the hood to somewhere underneath the car in the under car airflow. It made a ton of difference for my tunnel heat problem.
Also, spend the extra bucks and get them JetHot coated to help with the underhood heat. A side benefit of installing headers is that you move those two furnaces (a.k.a. stock catalytic converters) out from under the hood to somewhere underneath the car in the under car airflow. It made a ton of difference for my tunnel heat problem.
Le Mans Master
Joined: Dec 2005
Posts: 6,999
Likes: 1,684
From: Southeast TX
My observation has been that headers do allow more mechanical noise to be heard...primarily valve train. The mechanical noise is a by-product of the thinner tubes. Headers combined with free flow cats will also increase exhaust volume some...not really perceptible when my NPPs are closed though. Stay away from the temptation of the Gaybay Whang Chu el' cheapo headers...you get what you pay for! BUY AMERICAN! Also, spend the extra bucks and get them JetHot coated to help with the underhood heat. A side benefit of installing headers is that you move those two furnaces (a.k.a. stock catalytic converters) out from under the hood to somewhere underneath the car in the under car airflow. It made a ton of difference for my tunnel heat problem.
Also, spend the extra bucks and get them JetHot coated to help with the underhood heat. A side benefit of installing headers is that you move those two furnaces (a.k.a. stock catalytic converters) out from under the hood to somewhere underneath the car in the under car airflow. It made a ton of difference for my tunnel heat problem., but he's on point. The Z06 ex manni's will keep the heat inside the manifolds and squirt it out the back. Uncoated headers radiate the heat inside the under hood area. If you don't have good airflow through that area, it just compounds a bad situation.
Team Owner
Joined: Aug 2007
Posts: 136,140
Likes: 2,432
From: I live my life by 2 rules. 1) Never share everything you know. 2)
St. Jude Donor '11-'12-'13, '16-'17-'18
I've been thinking about doing this to my '07 coupe too.
Couple of questions for you
Stock internals?
A6 or MN6?
Couple of questions for you
Stock internals?
A6 or MN6?
