Under-Drive Pulley Kit for 540i

[bmwauto]

evosport sales under drive pulley kit for$300. i read that you can get up to 12hp.is this true? and someone have them install? any feedback or opinions:cool

[jabdelja]

i have the pulley kit from rogue engineering for my 528. It def improved the torque, hp gains are slightly noticeable, however it definitively pulls a lot harder switching lanes on the highway. Hope i helped

[ProPhotog]

i have the pulley kit from rogue engineering for my 528. It def improved the torque, hp gains are slightly noticeable, however it definitively pulls a lot harder switching lanes on the highway. Hope i helped

did you notice any drawbacks with the pullies? ie - alternator charging, coolant temps

[Wolfen]

They don;t sell the pulley that gives 90% of the benefits of an underdrive pulley. And that's the pulley on the crankshaft. The accessory pulleys are a waste of time in terms of price to benefit. Better spend the 300 on software.

[jabdelja]

No, alternator does fine, im running two 1000 watt amps, and 3 monitors no problem. Cooling is also fine. my kit didn't come with crankshaft pulley because apparently its bad for your car. good luck

[Wolfen]

It's not bad for a car. There is some discussion over whether running a pulley with no harmonic dampener can crack the crank over time. Or at the very least cause oil leaks on the crank bearings and seals. Hypothetically.
If the crank pulley is made to very tight specs, like .001 of an inch you may have your car for a lifetime and never have a problem.