[PatrickfromMD]

Originally Posted by mike@newera

George pretty much covered everything that needs to be changed to get rid of the AFM in the L99, assumming that it will be exactly the same as it is in the G8. We currently sell cam packages that delete everything and come with a cam and upgraded valvetrain components as well for the G8, see the upcoming September issue of GM High Tech Performance magazine as one of our custom kits gets tested in a G8GT.
The VVT is going to have an advantage over the engine without it, once the modding starts in my opinion, you can put a pretty big cam in it and by adjusting the cam timing, gain 30-50 lbs of torque down low and make it peaky up top making the lower end of the rpm band pretty much respond like it has a different cam in it. That is why I ordered an automatic, plus we need a test car of course to develop camshaft profiles for this VVT function.

Mike

Mike,

I’m interested to know more about the VVT offerings you will have available in the future. I believe we share the same opinion to leverage the advantages of the L99 motor and lessen the disadvantages.
I have a couple questions you might be able to help with. I read the L99 has relieved pistons that reswulte4d in a 10.4/1 cr vs. 10.7 for the L99. This was done to allow more piston to valve clearance when the cam phases is advancing and retarding the cam. How do you get more cam profile into an engine that already has tight piston to valve clearances? Do you limit the amount of degrees the phaser can dial in? Do these cam options necessitate to removal of the AFM lifters?
I understand the lifters are the primary reason for the lower 6200 rpm redline. A more aggressive cam (maybe we are just talking lift and not duration) may add additional stresses to the AFM lifters. Do you have a lesser profile allowing one to retain the AFM?
I have read in some of the G8 forum’s that some car owners have tweaked the AFM to kick in earlier and have seen noticeable mpg benefits.
I’m shooting for the best of both worlds, broader torque curve than the LS3, better mileage than the LS3 and more peak HP than the LS3 (at least until 6200 rpms that is)
I still have not ruled out a supercharger, hopefully the mods you may be carrying will be compatible with that as well.