I researched this a couple of years ago before I bought my pulley. Even with the decreased diameter of the 2.3 inch pulley, the SC is still within it's safe operating RPM range. I agree that bearing life may be sacrificed some but I feel pretty confident the SC will hold up to the increased RPMs. Besides, there have been several people on this forum that have performed this upgrade and I have yet to hear of someone blowing up their SC because of this mod.

Josh

2000 to 2004 towing capacity for a manual is 3500 lbs, auto is 5000 lbs.
In 2005+ all Xterra are rated at 5000 lbs.

-Josh

This seems like it should be the opposite, wouldn't a manual provide more torque than an auto?

whats the differnce in size. whats better going as small as you can go or just a little smaller. are there downside to going the smalled you can go?

Thanks

If you go too small you will over rev the SC and break it. You will most likely blow your engine from overboosting as well.

Engines provide torque, not transmissions. Evidently there is a limiting part in the manual transmissions that was corrected in 2005.

Does you gas mileage take a dramatic nose dive when you put the smaller pulley on?? This is my first post so be nice!!

More power=more lead in the right foot. So, you're mileage would probably go down.
PS-Welcome aboard!

Based on what I understand about the Xterra's supercharger system, the gas mileage will only decrease when you are using the supercharger (med to high load conditions). I don't think it will affect highway driving conditions because of the bypass valve that basically disables the supercharger during light load conditions. I have not installed my pulley yet so I have no personal experience that backs this up.

Your gas mileage will always be lower even when you aren't using it because the s/c still induces drag on the engine (through the pulleys).

good point. For you guys that have gotten smaller pulley's, are you replacing them yourself or having a shop do it? I want to get one but I dont think I can do it myself, haha.

You will always have increased parasitic loss due to driving the pulley faster and you may notice a small decrease in gas mileage, but I don't think it will take a "nose dive". In fact I question whether it will even be noticeable during highway driving.

That's some good info, I really want to hear from some people who have either installed it themselves or taken it to a shop. Is there any prerequisit (spelling?) before installing the pulley? I'd assume an intake or kn filter... Thanks for all the input guys!

I have installed the pulley on my old 2002SC. It is not to hard if you have basic mechanical knowledge and tools.

I have the puller BTW.

I'm new to these trucks, however not forced induction. To my knowledge it really doesn't matter how much boost you throw at these engines. If your wastegate is set to dump at 5psi than that's all the boost you're going to get. The pulley will only help to increase getting max boost sooner... 2500 Rpms instead of your old pulleys 2800 Rpms as an example. I'm not sure what the specs are with these trucks but if someone knows what psi the WG dumps at that would be very helpful.

In the 41/2 years I've owned my X I think I've asked you this twice before. Well, time for an update.....ant problems since you've installed the smaller pulley and what size did you put on? Thanks......again!