Quote:
Originally Posted by gringo
The real reasons were probably emissions and CAFE. The L99 was detuned for the LS3 which was the hot power setup on the 5th gen. So, they restricted it by offering it with only the manual transmission sans AFM or VVT.
With the new direct injected LT1, no compromise engine options were needed. The cam and VVT could be optimized for maximum power. The new AFM setup along with the 8sp auto brought MPG targets up where they needed to be without sacrificing HP.
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No, there was an article about the L99 and it was talked about that the limiting factor was the AFM system at the time had limits cams as well as rpms.
http://www.superchevy.com/how-to/eng...an-l99-camaro/
Here is one reference from one article about the AFM lifters on the L99.
"Unlike a "typical" LS3 cam swap, the VVT camshaft system requires builders to remove the factory Active Fuel Management (AFM) lifters. These lifters just can't handle the lift of an aggressive camshaft, and must be swapped for a set of Comp Cams supplied hydraulic roller units. This means the cylinder heads have to come off"
The AFM system on the L99 used lifters that couldn't handle more aggressive camshafts and also limited rpms further so this limited the horsepower rating and rpm range of the L99 engine compared to the LS3.