SMOG LEGAL ENGINE SWAP TO LS yesterday passed!

[Axle]

Originally Posted by nekkidhillbilly

the trans thing is crazy how the hell does that make a difference in emissions. fuel economy possibly if you kept say a th350 or 400 but emissions aren't going to change. I wonder how they deal with

Think about how modern vehicles control the transmission and what gear you are in. A th350 cruising down the highway in 1:1 is going to rev higher than the overdrive computer controlled vehicle that is always attempting to keep you in the highest gear possible, and lowest rpm to not only keep fuel consumption down, but to also lower emmisions by keeping the engine in a certain rpm band for the given speed. Keith S. can probably give us an idea of how much time in development is spent on meeting emmsions targets, or how much it plays into what rolls off the end of the assembly line.