If I were to get a lightweight flywheel, cf driveshaft, etc would this help the reduce turbo lag?

 

none of these parts increase flow through the engine, therefor they have nothing to do with spooling the turbos. you will have just as much lag as before. but, these parts make you rev through the gears quicker giving the effect of less lag and better response.

 

If I'm reving through the gears quicker wouldn't I essentially be getting less lag? I mean if I'm reving quicker am I not spooling quicker also?

 

Yes, because if you are revving faster, the exhaust gas flow speeds up faster and your turbos spool up faster. I do notice turbo lag with the stock twins, but only when lagging the car (below 2000 rpm in 4th). Driving the car properly, there is almost no noticeable lag.

 

no, not exatly.

lag is defined by the the RPM that the turbo setup reaches full boost. the higher this PRM is, the more laggy the turbo(s) is/are.

for example, lets say you have a turbo setup that at 1800 RPM, you have 0 PSI of boost. 2500 RPM - 2 PSI. 3000 RPM - 8 PSI. and 3500 RPM - 15 PSI (full boost).

no matter if you have a lightweight flywheel or stock one, the boost pressure will be the same with the corresponding RPM. if you add a flywheel, you will not get boost at a sooner RPM, but that RPM will come sooner.

the only way you can achive a boost pressure at a sooner RPM is if you are increaing the air into and out of the engine and turbos. if more air is flowing, more boost is spooling. drivetrain modifications have no effect whatsoever on the amount of air flowing through the engine, therefor having no effect on the turbo lag.

just my .02

 

I was just wondering if it would make my car more resposive. I knew it would work if my wheels were off the ground but what I'm concerned about is whether it would make a noticable difference driving because the car still weights the same and it still has to fight the same inertia.

 

correct, the car still has to fight the same inertia, but it has to fight less of a rotating inertia if you have a lighter flywheel. it does not take the engine as much power to turn the lightre flywheel, therefore you rev quicker, have better throttle response, etc...

 

A light flywheel wakes the car up. It "takes off" faster in low gears. There is little effect in high gears, but another nice side effect is that it is easier to match revs when downshifting.

-Max