Do you have an estimated HP gain for the underdrive pulley and the standard lightweight pulley to see the difference in HP changes on the Q50 3.7? The weight difference with each seems like it would make the biggest difference in performance as the underdrive is 3.73 lbs. lighter and the standard lightweight pulley is 3.4 pounds lighter. I read somewhere that you can gain (on average) from 3-6HP per pound saved since the power is under the power curve so (theoretically) the underdrive pulley "can" gain anywhere from 11.19 - 22.38 HP (not including any potential HP gains from the underdrive aspect) and the standard lightweight pulley could gain 10.2 - 20.4HP.
It seems the standard pulley would be the better option for standard cars and normal drivers who aren't racing all day every day (or drive in high RPM mode all the time).
I was also curious if you have tested voltage and power loss with the underdrive pulley. I drive on the highway a lot with cruise control and I don't want my battery to die one day because it wasn't charging enough.
Also, I live near Dallas, TX and I have no idea how to install anything like this or know anyone who could. Do you have suppliers that do this in this area or could you direct me to any place that would handle this type of thing (besides the overpriced car dealer lmao)?
Last edited by DallasQ; 08-10-2015 at 02:43 AM.