Katech_Jason
05-09-2011, 03:29 PM
Last week we conducted a test of two different ported LS3 intake manifolds and a FAST LSXR 102mm intake. The test subject was a 6.2L LS3 with the following:
-Katech Torquer LS3 cam
-Springs, retainers, pushrods
-WCCH ported heads
-C5-R timing chain
-Katech ported oil pump
Tests are as follows:
C2-9336 - stock baseline 530hp/477ft-lbs
C2-9344 - brand Y ported LS3 intake 529hp/474ft-lbs
C2-9348 - brand X ported LS3 intake 527hp/470ft-lbs
C2-9345 - FAST LSXR 102mm intake manifold 538hp/484ft-lbs
http://www.katechengines.com/street_performance/images/FASTLSXR102LS7/Stock%20vs%20ported1%20vs%20ported2%20vs%20FAST_3. jpg
Zoomed:
http://www.katechengines.com/street_performance/images/FASTLSXR102LS7/Stock%20vs%20ported1%20vs%20ported2%20vs%20FAST_4. jpg
As you can see both the ported manifolds lost power and the LSXR was the only one with a gain. These intakes were shown on the chassis dyno to make power so it just goes to show that the chassis dyno is not a good place to do precise A-B testing, and every tuner that ports manifolds will do what they can to make the product look good when testing. When you take that product to the controlled conditions of the engine dyno and take out all the variables, you see that you have actually lost power. This is a fairly mild LS3 engine and we can only guess that the more modified the engine is, the more it would benefit from the FAST manifold. Whether the gain on a stock or mildly modified engine is worth it to you, only you can decide.
-Katech Torquer LS3 cam
-Springs, retainers, pushrods
-WCCH ported heads
-C5-R timing chain
-Katech ported oil pump
Tests are as follows:
C2-9336 - stock baseline 530hp/477ft-lbs
C2-9344 - brand Y ported LS3 intake 529hp/474ft-lbs
C2-9348 - brand X ported LS3 intake 527hp/470ft-lbs
C2-9345 - FAST LSXR 102mm intake manifold 538hp/484ft-lbs
http://www.katechengines.com/street_performance/images/FASTLSXR102LS7/Stock%20vs%20ported1%20vs%20ported2%20vs%20FAST_3. jpg
Zoomed:
http://www.katechengines.com/street_performance/images/FASTLSXR102LS7/Stock%20vs%20ported1%20vs%20ported2%20vs%20FAST_4. jpg
As you can see both the ported manifolds lost power and the LSXR was the only one with a gain. These intakes were shown on the chassis dyno to make power so it just goes to show that the chassis dyno is not a good place to do precise A-B testing, and every tuner that ports manifolds will do what they can to make the product look good when testing. When you take that product to the controlled conditions of the engine dyno and take out all the variables, you see that you have actually lost power. This is a fairly mild LS3 engine and we can only guess that the more modified the engine is, the more it would benefit from the FAST manifold. Whether the gain on a stock or mildly modified engine is worth it to you, only you can decide.