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Justin: Hey, Justin with Americanmuscle.com here with a stage three, power pack bolt-on
build up for an all '07, '09 GT500's. The focus of the stage three power pack is to
take our already worked up GT500 to the next level and beyond. How are we going to get
there? Well, for one, we're going to make sure our cars ready to flow some serious air,
improving on both the intake and exhaust side of the equation. On top of that, we're going
to add a little bit more boost to our car and see what kind of numbers are possible
with the factory Eaton m122 blower still in place. For starters, lets set the table for
a little bit more boost.
Once you start getting around 550 wheel horsepower in these cars, that factory throttle body
really becomes a big restriction. And since we're pretty much already there now with our
basic bolt-ons and 2.6" pulley, that factory throttle bottle just had to go. In its place
now, is the Ford Racing twin 65 millimeter cobra jet throttle body. This is the same
throttle body used on the purpose built, Cobra Jet drag car so you know its proven. This
is going to replace the twin 60 millimeter stoker with twin 65 millimeter openings, allowing
much more air into the super charger and into the engine. Since it is a Ford Racing part,
you know the quality, the fitment, and the electronics are all going to be dead on. And
lastly, I know we're all about performance here in these power packs, but you can't deny,
this is a very good looking part.
Polished billet construction and the Ford Racing logo looks so good under the hood,
especially along side that JLT carbon fiber intake. Now that we open up things on the
intake here, lets take a closer look at the exhaust. One of the biggest disruptor in exhaust
flow on any car is the factory cats. They're just performance killers, and that was certainly
the case here with our Shelby's. So to fix that, we installed this off road x pipe here,
full stainless steel construction throughout, mandrel bends, and 2 3/4 inch tubing. Best
of all, really going to uncork the flow of exhaust and should transform our exhaust note
into something much more sinister.
Speaking of that exhaust note, if getting rid of the factory cats weren't enough, add
flow masters outlaw series axle back here has definitely given this thing, a tone worth
of one of the baddest Mustang's of all time. In fact, listen for yourself. We chose the
outlaw series again because of its straight through design which is going to increase
the flow of exhaust, when working with that off road x pipe we just mentioned. Now this
is basically just to ensure that our GT500 is ready to move some serious air, which is
very important here in the stage 3 power pack because we are going to be throwing a few
extra pounds of boost at our car. So with that said, lets get out from underneath the
car, head back up to the engine bay, and I'll show you guys where that extra boost is going
to be coming from.
Since we already have the 2.6" upper pulley here in our GT500, the options for adding
more boost are a little limited. In fact, the easiest and really only way to do so,
is by adding a larger, lower balancer. So we installed a ten percent lower balancer
from Innovater's West here on our '08 GT500. The 2.6" pulley with that balancer is actually
a very popular choice with any GT500 owners looking to get the most out of those Eaton
blowers. The Innovater's balancer is much lighter than our factory '08 balancer, which
will be dropping a rotational mass and by increasing the diameter by ten percent we
should be looking at three to four pounds more boost, which will put our Shelby at about
fifteen or so pounds of boost when its all said and done.
This is pretty much the safe, tried and true limit of efficiency of these factory and 122
blowers, that is of course, without any additional cording or pulling, like *** injection. You
start spinning them any faster and heat really becomes an issue, and at that point the super
charger begins to loose its efficiency, which means a drop in power. To help keep things
cool here in our Shelby, we installed the Afco Pro Series heat exchanger which does
include dual ten inch electric fans, to help keep things even cooler. The Afco itself is
a very nice piece. Its built extremely well, its great, and it does include everything
you need for a painless instal.
Because of this, its an extremely popular choice with terminator owners and their GT500
owners out there. In fact if you want to read up on some of the reviews, or learn more about
the heating danger itself, just go ahead and click on the link below to visit the product
page. So now that we have all of our stage three mods in place, we're gonna move the
car over to the Dino and let Mike in the band of performance team step in and let them do
their thing, but before we do, I just want to remind you guys to subscribe for our YouTube
channel if you haven't done so already, just to check out some of our other bolt-on build
ups and more mustang content. All you have to do is simply click on that link below.
When the stage two power pack was all finished up, the car was making 548 horsepower, and
545 pound feet of torque. A the end of the stage three power pack, the car is now making
581 horsepower and 600 pound feet of torque. Giving us a peak gain of 33 horsepower over
our stage two numbers, and gains of 47 horsepower, and 59 pound feet of torque throughout the
curve. So to recap, with all three power packs installed, we went from a base line number
of 434 horsepower and 432 pound feet of torque at the rear wheels. 581 horsepower and 600
pound feet of torque. That gives us a peak overall gain of 147 horsepower and gains of
157 horsepower and 169 pound feet of torque throughout the curve.
That's going to do it for the stage three power pack bolt-on build up for the 2007 to
2009 GT500. Our 2008 GT500 started out as a pretty formidable street car, but over the
course of three different power packs which included a bit more boost, bolt-ons, and a
quality tune, it has turned into an absolute monster that is ready for just about any challenger
that might want to test it. At the track, or at the next red light, we hope you guys
have enjoyed watching these power packs, don't forget to check out stage one and two, and
for all things Mustang, keep it right here at Americanmuscle.com.