06stangia

If i have an electric water pump will underdrive pulleys help that much? Is it still worth the money?

Nuke

I would think so but perhaps a tad less than if you didn't have the electric water pump. Consider that the UDP's reduce some of the loss from the accessories and since you've taken the water pump out of the equation already, you have less losses to "improve" upon. You may not notice the additional RWHP that you free-up (many people don't notice it) but it'll be there. If you're counting each RWHP gain, then it's worth it.

GTR21

Sorry to hijack the thread, but when you put them on, do you notice a huge difference in your accessories? The reason I ask is because I live in central Canada, and +40 celsius or higher summers without A/C is never fun..

Nuke

Unless you sit idling for EXTENDED periods of time, you'll notice no difference in alternator, a/c function etc..

GTR21

Oh wow.. so it's like extra HP with very little effect. What would you classify as EXTENDED? And why would it be effected while sitting longer?

wayne613

Potentially not able to spin the alternator fast enough to generate the juice while sitting to get back the average drain your accessories would be causing while being that under-driven. So you could end up begging for a jump-start, or reducing the lifespan of your battery should you stop and idle for long stretches with them (potentially). Can't really see A/C function being affected, unless of course the battery gets too low, things tied to the SJB tend to start cutting out..

Of course getting a higher output and more reliable alternator would solve it.. As you have a 2012, I've not heard much either way about the 2011+'s charging system, likely far better off then we 05-09's.