• Spul Engineering releases their SSP (super spool pulley) underdrive pulley kit for the 2.0 TSI motors

    Underdrive pulleys are a popular way to extract a few more horses out of a motor. Essentially, by underdriving accessories such as the alternator, power steering pump, and a/c compressor, horsepower being drawn from the engine can be freed up. It is only a few more horses as the power gain for the part is claimed at 5-7 horsepower. Yes, not much power but for guys trying to extract every little bit to get that edge it is certainly an area to look into.

    Especially considering the pulley only costs $199. It is made out of aluminum and at 16 ounces lighter than the factory pulley at 64 ounces.

    Where is the dynograph though? Horsepower claims on paper are nice and yes underdrive pulleys do free up power but this website expects claims to be backed up.











    This article was originally published in forum thread: Spul Engineering releases their SSP (super spool pulley) underdrive pulley kit for the 2.0 TSI motors started by Sticky View original post
    Comments 4 Comments
    1. chrisisnapping's Avatar
      chrisisnapping -
      surprised they came out with this.

      Mainly because there are already a handful of pulleys on the market for the TSI and i know of less than 5 people on golfmk6 that run them. Even the guys with 500+hp stay away from them. Keep in mind they are harmonic dampeners. They need some weight on them. So while you may be saving 3lbs. You could run into issues in the long run as any harmonics in the engine will be amplified due to the loss of dampening.
    1. Sticky's Avatar
      Sticky -
      Click here to enlarge Originally Posted by chrisisnapping Click here to enlarge
      surprised they came out with this.

      Mainly because there are already a handful of pulleys on the market for the TSI and i know of less than 5 people on golfmk6 that run them. Even the guys with 500+hp stay away from them. Keep in mind they are harmonic dampeners. They need some weight on them. So while you may be saving 3lbs. You could run into issues in the long run as any harmonics in the engine will be amplified due to the loss of dampening.
      Valid points but as long as it doesn't mess with the crank pulley you should be ok.

      Regardless, there are better ways to get power. On my M3 I was very happy with my underdrive pulley upgrade though.
    1. chrisisnapping's Avatar
      chrisisnapping -
      Click here to enlarge Originally Posted by Sticky Click here to enlarge
      Valid points but as long as it doesn't mess with the crank pulley you should be ok.

      Regardless, there are better ways to get power. On my M3 I was very happy with my underdrive pulley upgrade though.
      they definitely do well on larger engines, lots of v8 owners across the board get them.

      However for less than 10bhp for $200? Better off getting a cheap single nozzle meth kit to put in the charge pipe to get those nice and cool IATs. Much better in the long run.
    1. Sticky's Avatar
      Sticky -
      Click here to enlarge Originally Posted by chrisisnapping Click here to enlarge
      they definitely do well on larger engines, lots of v8 owners across the board get them.

      However for less than 10bhp for $200? Better off getting a cheap single nozzle meth kit to put in the charge pipe to get those nice and cool IATs. Much better in the long run.
      I do not disagree.

      On an a high strung NA motor where every course is hard to come by it's a more valid upgrade.