Ported LS2 manifold
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Joined: Mar 2004
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From: Australia
Ported LS2 manifold I recently did a back to back test on a ported vs. stock LS2 manifold. Bear in mind that all the testing I have seen so far indicates that 90/LS2 vs 75/LS6 is on par (with tuning).
The testing was done on the same day, same dyno within hours of each other, same car and tune. Nothing was touched bar changing manifold.
The problem with the LS2 2-pice is just that - its a 2-piece where the joins result in steps inside the runners. The quality of joinery is dubious at best and after examining one up close, can see why the LS2 seems such a hit-n-miss affair.
I will post some pics of the port job when I can find my camera USB cable. Here are the dyno sheets...
POWER
TORQUE
I picked up 10rwkw everywhere, not just the top end. Furthermore, the lower down, the greater the gains were. With porting, these LS2 manifolds seem to offer significant efficiency gains, especially around peak torque.
Torque gains were in the order of 45-50NM, but the seat of the pants feel, which the dyno can't measure (below 5000RPM) indicates there are greater gains still. Feels like a smaller cam with more torque. The just-off idle airflow stalling effect is totally gone, and the pedal response is smooth and progressive - holding the torque and increasing power the more you pedal it - just like a carby.
Mark Busher from MBP Performance did the port job, taking out a full 2L coke bottle of plastic. All the ported manifolds I have seen to date have only been ported into the 3rd runner. Mark ports them all the way to the back, port matches the runners, radius edges the bell mouths and removes the ribs in the plenum.
The testing was done on the same day, same dyno within hours of each other, same car and tune. Nothing was touched bar changing manifold.
The problem with the LS2 2-pice is just that - its a 2-piece where the joins result in steps inside the runners. The quality of joinery is dubious at best and after examining one up close, can see why the LS2 seems such a hit-n-miss affair.
I will post some pics of the port job when I can find my camera USB cable. Here are the dyno sheets...
POWER
TORQUE
I picked up 10rwkw everywhere, not just the top end. Furthermore, the lower down, the greater the gains were. With porting, these LS2 manifolds seem to offer significant efficiency gains, especially around peak torque.
Torque gains were in the order of 45-50NM, but the seat of the pants feel, which the dyno can't measure (below 5000RPM) indicates there are greater gains still. Feels like a smaller cam with more torque. The just-off idle airflow stalling effect is totally gone, and the pedal response is smooth and progressive - holding the torque and increasing power the more you pedal it - just like a carby.
Mark Busher from MBP Performance did the port job, taking out a full 2L coke bottle of plastic. All the ported manifolds I have seen to date have only been ported into the 3rd runner. Mark ports them all the way to the back, port matches the runners, radius edges the bell mouths and removes the ribs in the plenum.
Teching In
Joined: Jul 2006
Posts: 4
Likes: 0
From: australia
manifold LS2
Originally Posted by MNR-0
I recently did a back to back test on a ported vs. stock LS2 manifold. Bear in mind that all the testing I have seen so far indicates that 90/LS2 vs 75/LS6 is on par (with tuning).
The testing was done on the same day, same dyno within hours of each other, same car and tune. Nothing was touched bar changing manifold.
The problem with the LS2 2-pice is just that - its a 2-piece where the joins result in steps inside the runners. The quality of joinery is dubious at best and after examining one up close, can see why the LS2 seems such a hit-n-miss affair.
I will post some pics of the port job when I can find my camera USB cable. Here are the dyno sheets...
POWER
http://users.bigpond.net.au/thompson...ted_ls2_hp.jpg
TORQUE
http://users.bigpond.net.au/thompson...ted_ls2_tq.jpg
I picked up 10rwkw everywhere, not just the top end. Furthermore, the lower down, the greater the gains were. With porting, these LS2 manifolds seem to offer significant efficiency gains, especially around peak torque.
Torque gains were in the order of 45-50NM, but the seat of the pants feel, which the dyno can't measure (below 5000RPM) indicates there are greater gains still. Feels like a smaller cam with more torque. The just-off idle airflow stalling effect is totally gone, and the pedal response is smooth and progressive - holding the torque and increasing power the more you pedal it - just like a carby.
Mark Busher from MBP Performance did the port job, taking out a full 2L coke bottle of plastic. All the ported manifolds I have seen to date have only been ported into the 3rd runner. Mark ports them all the way to the back, port matches the runners, radius edges the bell mouths and removes the ribs in the plenum.
The testing was done on the same day, same dyno within hours of each other, same car and tune. Nothing was touched bar changing manifold.
The problem with the LS2 2-pice is just that - its a 2-piece where the joins result in steps inside the runners. The quality of joinery is dubious at best and after examining one up close, can see why the LS2 seems such a hit-n-miss affair.
I will post some pics of the port job when I can find my camera USB cable. Here are the dyno sheets...
POWER
http://users.bigpond.net.au/thompson...ted_ls2_hp.jpg
TORQUE
http://users.bigpond.net.au/thompson...ted_ls2_tq.jpg
I picked up 10rwkw everywhere, not just the top end. Furthermore, the lower down, the greater the gains were. With porting, these LS2 manifolds seem to offer significant efficiency gains, especially around peak torque.
Torque gains were in the order of 45-50NM, but the seat of the pants feel, which the dyno can't measure (below 5000RPM) indicates there are greater gains still. Feels like a smaller cam with more torque. The just-off idle airflow stalling effect is totally gone, and the pedal response is smooth and progressive - holding the torque and increasing power the more you pedal it - just like a carby.
Mark Busher from MBP Performance did the port job, taking out a full 2L coke bottle of plastic. All the ported manifolds I have seen to date have only been ported into the 3rd runner. Mark ports them all the way to the back, port matches the runners, radius edges the bell mouths and removes the ribs in the plenum.
Last edited by TheBlurLS1; Aug 8, 2006 at 04:26 PM.
Teching In
Joined: Jun 2006
Posts: 12
Likes: 0
From: Melbourne Australia
I was present at this test and the response from the manifold was awesome...much better port job than pics available from ls2portworks as the porting doesn't seem complete in plenum by viewing the pics,it seems to only have been ported to the 3rd or 4th runner.Manifold from MBPerformance is ported all the way to the rear of plenum and runners are ported as far as the eye can see...an excellent job and excellent results speak for themselves.
Last edited by spanks; Aug 8, 2006 at 08:31 AM.
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Joined: Jun 2006
Posts: 12
Likes: 0
From: Melbourne Australia
ls there anyone in the stats that has fully ported the LS2 manifold 
