NST Pulleys + Automatic Transmission

[Tamago]

Originally Posted by NonStopTuning

As I have stated several times... the principles of weight reduction and underdriving apply the same way, regardless of transmission type. Weight reduction is very noticeable when it is performed in the rotating assembly. The gains are there, and they are real. We have a large number of automatic owners buying these pulleys.... sadly, as much as I beg and bump and plead, people don't seem to want to post up...

Consider this analogy... Person A weighs 300lbs and goes on a diet, sheds 10% of his weight. Will he notice a difference? Person B weighs 250lbs and goes on a diet, sheds 10% of his weight. Will he notice a difference? The answer should be yes, they will both notice the benefits of weight reduction, even though they started out at different weights.

For those who don't consider pulleys a "worthwhile" modification... I find it interesting that many of the same people invest in lighter wheels, body panels, and especially lightweight flywheels. The concept is the same. In fact, weight reduction in the rotating assembly yields better gains than similar weight reduction performed elsewhere.

Good luck and have fun with all your projects everyone!

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!

[Aothachos]

trust me just get them, i have a AT sedan, i put the 10% underdrive pulley on first and tested it out for a couple weeks and it was such a good increase in throttle response and so much better. and then i had the water pump and alternator pulley installed and wow, power i felt a little difference but to me with this car is a big difference. I suggest it deffinatly

[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