Donor Part Selection Tips; Fords Passive Anti-Theft System (Pats) - Factory Five Racing Mk4 Roadster Assembly Manual

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 The 4.6L engine is quiet while cruising and loud upon acceleration where the 5.0L is loud all the
time.
 The 4.6L gets better mpg for the same horsepower level.
 The 4.6L engine is more expensive to upgrade parts. You have to buy two or four cams vs. one, etc...
 The 4.6L build is harder because the engine has a more complex engine management system with the
passive anti-theft system (see a couple sections down) built in.
We have found that the best balanced fun street cars have 300 to 350 horsepower. To do this with a
5.0L means upgrading the following parts: heads/cam/intake/mass air/fuel injectors. This level of
power is stock with the 4.6L 4 valve engines. The ultimate decision is the builder's preference.

Donor Part Selection Tips

The following are a few tips we've picked up over the years when dealing with used parts. In addition
to the parts that come with the kit, you have to provide the running gear and some other parts that can be
taken directly off a 1987-2004 Mustang. This section deals with those donor parts. If you are getting
parts from a different source, please refer to the last section in this chapter, "Not using a Donor". If you
find that some parts of your donor are too rusted or not usable, Factory five does have all of the parts,
except for engines and transmissions, available as modules (i.e. Fuel system, cooling system,
spindles/brakes, etc...).
The Factory Five Roadster kit is designed to use parts from the 1987-2004 Mustang. You can use many
of the same parts from earlier and later model Mustangs but there are some differences. For example,
before 1987 the Mustang used smaller components such as 10" front brakes, 7.5" rear-ends, and the
engines produced less horsepower. Likewise, the 1994-95 and the 1996-2004 models have many shared
parts but there are some important differences. If you choose to use older or newer donor parts, check
out the "Mustang Specifications" Appendix for information on the different parts or call the FFR tech
department and ask about what specific parts you can use.
If you go to a salvage yard for parts, the donor parts list in the Appendix will help you check to see that
you have procured all the required parts in order to avoid a return trip. Try to get everything you need
before you pay and leave. We've found that the average parts yard doesn't exactly serve as a model of
modern customer service philosophy. Ford made over a million Mustangs so the availability of
complete running, non-crashed cars is also good.
The 03-04 4.6L DOHC Cobra™ engine is not a direct bolt-in. The steering requires relocation,
the hood may require modifications and the front 4" crossmember needs cutting to clear the
crank pulley.
The T-56 Should only be used with an IRS because the driveshaft becomes too short.

Fords Passive Anti-Theft System (PATS)

The keys for these vehicles, 1996-2004 Mustangs, have a tiny radio frequency transponder imbedded in
the plastic head.
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www.factoryfive.com
508-291-3443

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