GS-Whats the difference
Instructor
Joined: Nov 2012
Posts: 177
Likes: 2
From: Flower Mound Texas
Oh, and as for that power rating? We're skeptical. The SAE certified output ratings of the machine-built LS3s destined for marriage with an automatic and the hand-balanced, manually assembled LS3s that go with the manuals are both rated the same, but the engineers winked and admitted that its possible that more of the Wixom motors just happen to skew toward the top of the tolerance range for output. How better to explain the 0.2-second lead it enjoyed over the Z51 at the 60-mph mark (3.9 vs 4.1 seconds), which widened to 0.3 second and 2 mph at the quarter mile?
Race Director
Joined: Mar 2005
Posts: 10,399
Likes: 26
From: Austin Texas
I stumbled on this article some time ago that I found interesting considering mine was also built in Wixom. Even got my engineer Gary Andrews to sign a poster for me
Oh, and as for that power rating? We're skeptical. The SAE certified output ratings of the machine-built LS3s destined for marriage with an automatic and the hand-balanced, manually assembled LS3s that go with the manuals are both rated the same, but the engineers winked and admitted that its possible that more of the Wixom motors just happen to skew toward the top of the tolerance range for output. How better to explain the 0.2-second lead it enjoyed over the Z51 at the 60-mph mark (3.9 vs 4.1 seconds), which widened to 0.3 second and 2 mph at the quarter mile?
Read more: http://www.motortrend.com/roadtests/...#ixzz3F6jFYHUc
Oh, and as for that power rating? We're skeptical. The SAE certified output ratings of the machine-built LS3s destined for marriage with an automatic and the hand-balanced, manually assembled LS3s that go with the manuals are both rated the same, but the engineers winked and admitted that its possible that more of the Wixom motors just happen to skew toward the top of the tolerance range for output. How better to explain the 0.2-second lead it enjoyed over the Z51 at the 60-mph mark (3.9 vs 4.1 seconds), which widened to 0.3 second and 2 mph at the quarter mile?
The LS3 dry sump manual is NOT hand balanced. It's hand assembled from the same parts bins the wet sump. The difference is only one person handling all the parts and all the assembly instead of a line of people with specific tasks.
The Wixom assembly was used because it was already setup for the longer, heavier crankshaft needed for the dry sump.
The only back to back test between a dry sump and a wet sump was done by a magazine using one block and all parts the same except for the dry sump crank and oil pump. The dry sump dynoed lower HP. Makes sense since it takes power to run an extra oil pump. No engineers wink needed.
Last edited by haljensen; Oct 3, 2014 at 07:26 PM.
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