Sloth

I don't claim to be an expert, but I have never heard that one before. The flywheel reduces the rotational mass of the engine and the pulleys reduce the rotational speed of engine accesories. Both parts allow the engine to rev quicker and easier. I have both equiped on my professionaly built track cars and I would only assume that the factory built racers are equiped the same.

Smaller pulleys are used on track cars b/c the engines spend most of their life at higher RPM's and the accesories last longer whens slowed down a bit. The potential downside on a street car is that it may slow the accesories down to much leading to some battery charging issues. Remember that street cars don't usually spend as much time in the upper RPM range as track cars.

Balkan

You have that the wrong way round !..........which is why the RS has lighter flywheel AND lighter pulley.
I have been told the RS part number is the one to use and have ordered it.
Bolt is 40mm long, std GT3 is 48mm, which gives a clue as to the difference.

Cup pulley uses another bolt and shouldered washer.

RayGT3

Balkan,
Please keep us informed as to what you actually find and how the swap went. And of course any observations you might have as to the swap. Tnx

fryd

Let's put it this way. I learned last week how to do Turn 1 to Turn 5 at Watkins flat out...the HARD way. 120mph or so sideways across the bridge into the guardrail. Not much left of the back end.

Sloth

Sorry to hear that. I hope you were alright.

fryd

Other than the car, the only thing hurt was my pride.