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supercharging
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<blockquote data-quote="E34EuroTouring" data-source="post: 67851" data-attributes="member: 1026"><p>Engine tolerances when doing SuperCharging.</p><p></p><p>1) FPR and injectors. They can handle 20% net increase. </p><p></p><p>2) Gearbox. Steptronic can handle between 15%-20% depending on the boost buildup. It is one of the weaknes points of the drivline.</p><p>For manual tranny, the clutch is the weakest part and is the FIRST to go , if stock clutch is used. change to M-class clutch or heavy-duty sach or equivalent.</p><p>Manual drivetrain can handle 40-45% power increase.</p><p></p><p></p><p>3) Oil. Tranny coolers and engine oil coolers recommended due to higher heat built up levels.</p><p></p><p>4) Brakes will wear out faster due to greater acceleration, meaning harder stopping needed. Rotor may warp sooner if hard braking is used often.</p><p></p><p>PS: For M50B25, 20% power increase is 192hp -> 230HP crank. This already makes the car feel very different. Besides the torque curve will be different so the car gets going a lot faster. Your diff ratio will soon be a limit as 1st gear is pretty useless, you start in 2nd gear, so you effectively lose one gear!. Argh, 4 speed manual. But a fast one.</p></blockquote><p></p>
[QUOTE="E34EuroTouring, post: 67851, member: 1026"] Engine tolerances when doing SuperCharging. 1) FPR and injectors. They can handle 20% net increase. 2) Gearbox. Steptronic can handle between 15%-20% depending on the boost buildup. It is one of the weaknes points of the drivline. For manual tranny, the clutch is the weakest part and is the FIRST to go , if stock clutch is used. change to M-class clutch or heavy-duty sach or equivalent. Manual drivetrain can handle 40-45% power increase. 3) Oil. Tranny coolers and engine oil coolers recommended due to higher heat built up levels. 4) Brakes will wear out faster due to greater acceleration, meaning harder stopping needed. Rotor may warp sooner if hard braking is used often. PS: For M50B25, 20% power increase is 192hp -> 230HP crank. This already makes the car feel very different. Besides the torque curve will be different so the car gets going a lot faster. Your diff ratio will soon be a limit as 1st gear is pretty useless, you start in 2nd gear, so you effectively lose one gear!. Argh, 4 speed manual. But a fast one. [/QUOTE]
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