why L99 and not ls3?
08-13-2011, 10:28 AM
#1
why L99 and not ls3? how come the fifth gens had to use an L99 for there autos and ls3 for 6 speeds? whats the difference between the motors? idlike to know displacement differences and hp numbers if possible......also just any other differences. thanks
08-13-2011, 10:55 AM
#2
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the L99 has DOD/AFM(displacement on demand) to "prevent" gas guzzler tax. L99 is basically a detuned LS3 with a rating of 400hp. some other differences are VVT, lower lift cam, lifters and a few other things that i can't think of off the top of my head
11-05-2011, 08:34 AM
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Here's your answer! "Active Fuel Management is a welcome addition for the Camaro, but this begs the question: Why only the automatic? Couldn't engineers incorporate this technology into manual-equipped cars as well? "When switching from 8- to 4-cylinder mode (or vice versa), there are some transitions that you have to deal with," explains Rydzewski. "Typically, a good way to do this is by using a torque converter. The ability to control the slip of the torque converter [via the torque converter clutch] is a big enabler in getting good transitions. The whole thought behind having AFM is, you don't want to have interruptions; you want it as seamless as possible." In other words, GM doesn't want to repeat the mistakes made with the 1981 V-8-6-4 Cadillacs, which often exhibited noticeable hesitations when switching cylinder modes (hence the technology only being offered for one model year). Nevertheless, we were told AFM could be implemented on a manual, and that GM actually is looking into it. But because a manual transmission's clutch is a straight coupling (and one that is hydraulically actuated only by the driver), it is not as adept at damping the slight drivetrain vibrations that occur during AFM activation/deactivation."
