NST Pulleys + Automatic Transmission

[eTiMaGo]

Originally Posted by Tamago

it's also important to note that the accessories under the hood turn at rates sometimes exceeding 3X that of engine RPM depending on the pulley ratio. weight reduction on these "higher RPM" pullies would definitely be beneficial, however, those pulleys are still turning "stuff" that applies resistance to your engine.

i went to a clutch/flywheel setup that was 5lbs lighter than stock (would have been more but i went to a stage3 clutch and that pressureplate was HEAVY) and i really didn't notice any power gains. revs dropped off faster (had to re-learn heel-toe downshifting) but the car really didn't feel any more powerful. that's one of the reasons i never did lightweight pullies, cost vs hp it just didn't add up for my very very cheap budget.

either way y'all make quality parts, and that's what matters!

Yep, in that sense the regular lightweight pulleys offer mainly the improvement of faster engine response (had to readjust my shifting too ), but the underdrive ones will affect the parasitic drag which does have a measurable effect on performance.

But back on topic, from what I understand, even the lightweight pulley on an AT leads to the transmission feeling much more lively. It won't be as noticeable a difference as with a MT, but it ought to help make the driving more enjoyable