Justin: Hi, everyone, Justin with Americanmuscle.com here with a Stage Two Power Pack Bolt Onbuild
up for the 2010 through 2012 GT500s.
Now a lot of times gear heads will say boost is an addiction.
You get some and you just want more and more, and that's certainly the case here with these
GT500s.
Given a few extra pounds of boost along with a quality tune can really transform these
cars into a completely different animal and that's what we're after here today with our
Power Pack.
Now if you guys are looking for more power out of your Mustang, whether it's a GT500,
GT or V6, you need to click on the link below to subscribe to our YouTube channel for more
great Mustang videos including more Bolt-On Build-Ups.
The Stage Two Power Pack is no doubt a favorite with many GT500 owners and its for those of
you that have already taken care of the few of the basic Bolt Ons.
Your cold air intakes and tune for example.
Just like a lot of other things in the forced induction world you can't just crank up the
boost and go without addressing other key areas of your ride to ensure your getting
the most out of your mods for one, but for more important reasons, to ensure the safety
of your motor.
So with that said, let's check out some of the parts for this Power Pack.
Under the hood now your going to find a couple new parts, both from Metco Motorsports that
we just finished up installing in our 2012 GT500.
The first one is the 2.6 inch pulley from Metco Motorsports.
Now a supercharger pulley like this unit is always a very popular choice with the GT500
owners out there, because it's going to spin that stock heat and blower must fast, creating
more boost.
In this case, we should be looking at three to four more pounds of additional boost when
compared to the factory pulley.
Now besides spinning the blower faster creating more boost, we should also look for an increase
in that beautiful supercharger whine, that we all know and love.
Especially with that JLT intake in place.
The Metco Pulley is actually a very nice piece and its actually highly recommended with other
GT500 owners here on the site.
In fact, if you just want to click on the link below you can catch up on some of the
customer reviews.
The design of the pulley is actually a two piece design, meaning you have a hub that
presses to the supercharger shaft first and then the actual pulley part bolts to that
hub using the included fasteners here.
This is just going to make any future pulley swaps a complete snap.
If you ever want to lower or increase your boost in a hurry.
Now you want to make sure you have a quality pulley removal tool, first before getting
started removing the factory pulley and installing the new Metco unit here.
It's just going to make life a whole lot easier, trust me.
And again, you can't just bolt up a smaller pulley, and go.
For one, doing so will create slack in the factory serpentine belt which is never a good
thing.
What happens is, the factory tensioner system can't make up the difference caused by running
the smaller pulley which is going to lead to dreaded belt slip, robbing your GT500 of
not only boost but also power.
That leads me to the second part of our Power Pack here.
The Metco Motor Sports auxiliary idler pulley kit.
Now the job of a kit like this is to take up all that extra slack created by the Metco
Motorsports 2.6 inch pulley, creating much more belt wrap and preventing belt slippage.
This way the boost level should stay rock solid even through the upper RPM range.
On top of that, the double bearing construction with the idler, is going to be a little bit
more durable, maybe a little more quieter than the single bearing unit and for only
a few bucks more it really is worth it in my opinion.
Alright, with the Metco idler in place to do its thing, of course with the smaller pulley
in place to spin that blower up much faster, we will be seeing more boost.
Meaning we had to address our spark plugs.
So we installed the NGK TR6 plugs which really, are the go-to spark plug for any Shelby owner
who is upping their boost.
They're a one heat range colder plug compared to our stock plugs which will help avoid any
possible detonation.
An import note, just make sure they're gapped correctly before install to avoid any spark
blow-out.
Definitely recommend doing something like this whenever you start increasing the boost
levels in your GT500, like we are here with our 2012.
Alright, with our Stage Two Power Pack in place, I got my good buddy Mike Johnson, from
the Bama Performance team, to write us a new tune for our 2012 with the increased boost
levels.
Now Mike, explain to these guys at home, how the few extra pounds of boost are going to
effect things on your end?
Mike: Well with the higher boost levels in place we've already gone in and made some
adjustments to our timing tables so you won't see any detonation, and just in case, our
colder plugs are also going to help with that as well.
And then it's going in and looking at our fuel and spark tables, to make sure our air/fuel
ratio is right.
You won't have any problems there.
Justin: Well looks like your out of the car so I assume your all wrapped up.
Mike: Absolutely, she's all yours.
Justin: Cool man, I'm a hop in, let a rip.
At the end of the stage one Power Pack our 2012 GT500 was putting down 523 horsepower,
and 497 pound feet of torque at the rear wheels.
With the Stage Two Power Pack installed, the car is now making 532 horsepower, and 523
pound feet of torque.
Giving us a peak gain of nine horsepower over our stage one numbers and gains of 32 horsepower
and 36 pound feet of torque throughout the curve.
The Stage Two Power Pack consisting of the upper pulling supporting mods is always a
big hit with GT500 owners out there, and I think it's pretty easy to see why.
Bang for the buck, there's really nothing like swapping out that upper pulley and cranking
up the boost on your Shelby.
That's going to wrap up the Stage Two Power Pack Bolt On build up for the 2010 through
2012 GT500's.
Don't forget to check out the Stage One and Three Power Packs and remember, for all your
Mustang needs, keep it right here at Americanmuscle.com.