anti_virus347

iTrader: (2)

I was told that installing a underdrive crank pulley (by OBX) is a terrible idea. That since its missing the rubber seal thing that the OEM one has, it will essentially vibrate the motor to death. What are your thoughts on this? If this is true is there a fix?

draxcaliber

You're supercharged, you do not want an underdrive crank pulley as you will LOSE boost pressure!

but otherwise no, I had one for like 50k miles, no problems at all.

anti_virus347

iTrader: (2)

Interesting, was totally unaware!

My car is having a lightweight alternator and water pump pulley installed as we speak, was this a bad idea?

draxcaliber

Nope, nothing wrong with those. just remember, your supercharger's RPM is directly related to the ratio of crank pulley's RPMS. If you put on a smaller crank pulley, you'll generate less boost pressure are all speeds for your supercharger. If there was space, you'd actually want a LARGER crank pulley so the supercharger would spool up faster, which is why you have a smaller supercharger pulley.

anti_virus347

iTrader: (2)

Wow, had no idea. Im so damn clueless about this friggn car lol

Does anyone make larger ones? Would a light weight version do any good if its the same size?

jacob81

I've had one on my car for years, over 70k miles with no problems. I have the agency power pulley though and turbo but I love it.

draxcaliber

The crank pulley is really just snake oil. Any difference you feel is only in your head. Nobody makes a larger one because you can't fit one.

anti_virus347

iTrader: (2)

Wouldnt lighter weight pulleys all around be helpful tho? (water pump, alt, crank)

draxcaliber

theoretically yes, less rotational mass means less parasitic drive train loss, but seriously, you don't notice it. Save it for if and when you need to replace your serpentine belt next.

jacob81

Honestly, I did notice a slightly quicker throttle response when I first installed mine but there is no DRAMATIC difference. Its not going to give you 50hp and knock a second off you 1/4 times but I did notice slightly faster acceleration.