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Message: <blockquote data-quote="synchron" data-source="post: 812979" data-attributes="member: 115">The s/c 14 bearing be change, it will a bomb first thing. Second thing the charger will still produce the same amount of hot air. It does not matter what you do to the charger,unless you mod it into a screw type.Stock s/c always has a limitation to it. It is meant the way when it is build.S/c pulley can only set the max amount of boost that your engine get. Pulley A 15 means that the it can only boost 15 psi with pulley A and with the charger it suppose to be.For s/c the boost comes in the same time actually, just the amount of boost you will be getting at the same time. Example:- instead of getting 6 psi of boost in 3000 RPM, you will be getting 10 psi with a larger crank pulley.The smaller pulley you meant is the crank pulley or the s/c pulley? There is no way the boost will be cmg in at 8000 or 10000 RPM. Our engine does not REV so high anyway, 7600 RPM is the redline. You must make clear that you are using a s/c not a turbo charger.Roots s/c are well known for it responds not Top end power.The engine RPM speed and the s/c RPM speed are different but they are related. The equation is the diameter of crank pulley divided by s/c pulley diameter. Example:- 4agze oversize pulley 175mm is divided by s/c pulley diameter 124mm. You will get 1.41 ratio. At 1000 RPM engine speed the s/c will be spinning at 1410 RPM. At 2000 RPM engine speed the s/c will spinning at 2820 RPM. Do you get what i mean? Stock s/c parts are not cheap and they rare now adays. Aftermarket part are definately expensive. As i say before it all comes down to budget. Dont expect a RM 1000 budget engine to beat the a RM 10000 budget engine.If you are using the stock roots charger you can use the T50 gearbox since you will not be generating too much power. You can look 4.1 diff rear axle, it should not be too hard to find. W55 gearbox, 1g rear axle or silvia axle are over kill if you dont mod your until the extent.</blockquote>

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