Wo Hoo, Old thread hidup balik.
I have actually fitted a supercharger kit by Gerard/Turbo Sang on my Putra, years ago.
Had it only for 1 years did not like it & had it removed, reason being as follows;
1. Fuel Consumption
Ridiculously high, a full tank can only last for 4 trips to & fro from Pandan to Damansara Heights.
2. Engine Vibration
They were using the old SC 14 supercharger from Toyota, which is a twin lobe design unlike the newer helical three lobe design which can provide continuousl air/fuel flow into the combustion chamber. The twin lobe design provides air/fuel flow in pulses into the combustion chamber, so the engine vibrates like hell during idle. No amount of tuning can get rid of the vibration - only solution increase the rpm at idle which will make problem 1 even worse.
Don't know if Gerard is still doing the conversion, can still remember he had a workshop in Sungai Buloh-Voltz Hybrid, also met with Turbo Sang's son - Andy, whose shop is in Kepong.
I believe Andy is still running the workshop in Kepong.
U can try Powerzone which has featured a few Proton's with supercharger fitted, from the photos I believe Powerzone's supercharger is different from Gerard's.