NST (NonStopTuning) Pulleys. Info, Specs, User Data...

[Jason@SportsCar]

Originally Posted by NonStopTuning

Perhaps a solid (no holes, no slots) lightweight crank pulley is worth a try, something that we have the ability to produce for race use - going past 7500rpm.

For street cars, our regular Underdrive Crank Pulley and NST CR-Lite Crank Pulley should be, and have proven over the years to be, sufficient.

Best of luck with all your projects!

The slots/holes were not the point of failure for us, it was the mounting point. There is very little cross section around the mounting hole, once the unit failed we could see that. The front and back cuts in that area left very little material in the corner, it was not as thick as the face of the pulley, and this is where it cracked.

After the NST failure I went back to the OE piece. Some time later we found the Beatrush unit, tried it on another motor and the Micro Image piece on our 2012. The Beatrush unit was much beefier, but ultimately still had an issue - I was very disappointed when we got it because we were given the impression it had an elastomer damper, but it did not, and it was nearly as heavy as the OE piece. Once we noticed a problem with the Beatrush (took almost a year) we went back to stock on both cars. It just wasn't worth the risk for us.

I believe the issue may be accessory related. Not having a self tension belt system on the 1NZFE means there is nothing to help absorb the vibration once you eliminate the dampened crank pulley.

I sure would like to see ATI or Fluidampr build one.

Our NST (the exterior damage is road rash from when it popped off and passed me on the track):


Beatrush, has a more material around the bolt area, but still has issues beyond 7300rpm:


When Micro Image designed its pulley they addressed the cross section/mounting point concern, and still managed to build a very light pulley, but we never ran one long enough to see if it would let us down: