| As far as I know boost is a function of the amount of exhaust gases passing through the turbine. When you let off the go peddle the turbos are spooling down no matter that RPM your flywheel is traveling because no air is passing through them. In my experience, an engine which drops RPM quickly can be up shifted quicker...the sooner you shift the sooner you can get back on the go peddle and put exhaust gasses back into the turbos. I guess if your engine spins down too much after a shift it will take a bit longer to spool the turbos but this is the case no matter what flywheel you have and is more about driver skill. As far as I know the advantages of lower rotating mass are significant and any draw back will be overcome by a quicker revving engine. Also Consider what damper and crank you have. I'd suggest if you're going with a lite weight damper you may want the milder of the low weight flywheel so your total mass is somewhat even and lower over all. Too low and starting from a stop light will be annoying and stall prone. I have the lightened RPS flywheel, stock damper and an electric fan setup and my engine revs much easier and I've found no driveability problems but my car does buzz more when lugging around in slow traffic when I'm too lazy to down shift.
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