i am glad your gonna install pulley, they are great investments, but i can tell you this, you only need under drive crank pulley, the rest i really can't tell you if they make any powers at all...So, I've recently decided to do this modification. I've read a bunch of stuff on unorthodox's website and despite the bad grammar and spelling mistakes, the guys on that blog present some really valid arguments. I think for many this is a scary mod to do, simply because it involves taking apart something on the engine, which let's be honest, is scary for folks who are not well experienced. I am NOT experienced by my friend is and I trust the guy fully, he was like "oh yea, aluminum pulleys, great idea, you will def see HP and TQ gains". From the reading on unorthodox's website, and from my email discussion with Mike at the company, the logic is sound. The gains, as they say, is mainly from the reduced weight of the pulleys themselves, the 15-20% is the underdrive component.
If the same logic works with a lightened flywheel, then lightened pulleys relies on that same logic. The engine has to work harder to move the parts connected to it, plain and simple. You reduce that weight, the engine works better, runs faster and is less restricted. The same exact logic is put into AF downpipes and cat-backs, reduce the resistance (aka cat deletes and PCD's) and the engine runs better, more power, quicker revs.
Again, I'm gonna be doing this and buying all 4 pulleys for the project, which will amount to about $560. (Crank, alternator, tensioner and idler) the tensioner and idler are sold separately and the crank and alternator are sold as the package on pro-civic. I will ATTEMPT to make a DIY on this, but there is no promise. Unorthodox makes a good statement about their pulleys from their blog on the site, that other aftermarket companies don't balance the individual pulleys themselves, which from what I understand is extremely important. Plus, if you look at NST vs. UR, you'll see that UR pulleys are 10% lighter than NST (80% vs. 70%). I know BC makes pulleys too, and their advertised gains are less than UR and NST.
We'll see how it goes! I'll keep you all informed.
i have a set up that i use factory type-r + buddy club crank pulley and it makes a world of difference, the factory ecu auto adjust the rev limiter to 7500-7600 after the pulley install, and the rpm pulls alot faster like a old school, high revving k series motor.
i used ur on all my b series and they are great... but on the k, i like solid pulley design over pulley with holes in it...
reason ? just safer, solid pulley are harder to crack than pulley with holes in it...