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Justin: Hey, I'm Justin with AmericanMuscle.com and this is the Stage 2 Power Pack Bolt-On
Build-Up for all 2007-2009 GT500s. This Power Pack is for the GT500 owners who have already
taken care of some of the basic bolt-ons; your cold air intakes, your tunes, and are
looking for more power out of your supercharged 5.4 liter.
Now if you guys are looking for more power out of your Mustang, whether it's a GT500,
a GT, or a V6, be sure to check out some of our other Bolt-On Build-Ups by subscribing
to our YouTube channel if you haven't done so already.
This entire pack is centered around a very popular supercharger mod that's going to increase
our boost and therefore increase the horsepower on our GT500. However, just like anything
else in the forced induction world, you can't just add more boost without addressing other
key areas of your ride to ensure you're getting the most out of each mod, but more importantly
to ensure the safety of your motor.
So first, let's get to everybody's favorite topic, more boost. The first mod in our Power
Pack consists of the Metco Motorsports 2.6 Inch Upper Pulley. Now a smaller pulley like
the Metco here is always a very popular choice with supercharged applications because what
it's going to allow you to do is spin that stock blower much faster, resulting in more
boost. In fact, we should be looking at three to four pounds of additional boost compared
to the stock three inch pulley. The Metco itself is a very nice piece and is actually
very popular with other GT500 owners here on the site. In fact, if you want, you can
just click on the link below to read up on some of the reviews.
Now the design is a two piece design, so you have a hub that presses onto the blower shaft
first, and then the actual pulley bolts to the hub using the included hardware. This
is just basically going to make any future pulley swaps a complete piece of cake. I really
can't wait to see what a few extra pounds of boost are going to do to our power number,
and best of all, that factory Eaton blower should really be screaming.
With the pulley out of the way, let's talk about some of those other supplementary mods
that I told you guys about at the beginning of the Pack. Now again, you can't just bolt
up a pulley and go without addressing some other areas. Case in point, that smaller pulley
has now created some excess slack in our belt which basically our factory idler will not
be able to keep up with. What this is going to result in is dreaded boost and power robbing
belt slippage.
Enter the Metco Double-Bearing Auxiliary Idler Pulley Kit which we also installed on our
'08 here. Now this is going to take up the extra slack created by the smaller 2.6 inch
pulley and just create plenty of belt wrap to prevent any belt slippage, and more importantly
it's going to ensure that those boost levels stay rock solid all the way through the upper
RPM range. On top of that, the double bearing construction will ensure a little bit more
durability over time, it might actually be a little quieter, and for a few bucks more
it's really a no brainer.
Finally there's one more part to go over before we bring in Mike J from Bama to tweak the
tune a little bit for us, and of course turn the rollers one more time. With that pulley
in place, we're really going to be spinning our blower a lot faster than we were before
which of course will lead to 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 important note, just make sure they're gapped correctly before
install to avoid any spark blowout. Definitely recommend doing these plugs or something similar
whenever you really start cranking up the boost like we are here with the '08.
Alright, well with all the new parts in place, we have Mike J from the Bama Performance Team
in here working on the new tune for us for all increased boost that we're going to be
seeing thanks to that smaller pulley. Now Mike, obviously the car's going to be seeing
a lot more boost than we were before. How does that affect things on your end?
Mike J: Well basically with the higher boost levels, we're going to be seeing right around
12 to 13 pounds. I've already gone ahead and made adjustments to the ignition timing tables
to make sure that we're not going to see any detonation at all. I'm then basically just
looking at air-fuel ratio to make sure we're in that sweet spot.
Justin: Awesome man, I know those colder plugs should definitely help with that detonation
too.
Mike J: Absolutely.
Justin: Very cool, man. Well if you're all finished up, I want you to hop on out of there
because I think it's my turn. I get to hop in, do another pull, and see what the numbers
are.
[engine noise]
At the end of the Stage 1 Power Pack featuring our 2008 GT500, the car was making 508 horsepower
and 479 pound feet of torque at the rear wheels. With all the Stage 2 modifications in the
Power Pack installed, we were now putting down 548 horsepower and 545 pound feet of
torque making for a gain of 40 horsepower over our Stage 1 numbers, and gains of 66
horsepower and 71 pound feet of torque throughout the curve.
The Stage 2 Power Pack with pulley and supporting mods is always a favorite of GT500 owners,
and I think it's pretty easy to see why. Honestly, there's nothing that compares to swapping
those upper pulleys and really cranking up the boost.
Hey, that's going to do it for the Stage 2 Power Pack Bolt-On Build-Up for all '07-'09
GT500's. Be sure to check out the other Power Packs for the GT500s and don't forget to subscribe
to our YouTube channel if you haven't already. Thanks again for watching, and for everything
Mustang, keep it right here at AmericanMuscle.com.