Originally Posted by liamford
bottom pully????
Big turbo's use a 4 lug bottom crank pulley that the ecu (L6/L8/P8) use. Where as the small turbo's ECU use a 36 lug crank pulley. So if you doing a big turbo conversion you will need the old 4 lug pulley. I happen to need a 36 lug pulley for my T6 Ecu