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Building 4.6 / 5.4L Ford Horsepower on the Dyno Building 4.6/5.4L Ford
Horsepower on the Dyno
by Richard Holdener
The 4.6- and 5.4-liter modular Ford engines are finally
catching up with the legendary 5.0L in terms of aftermarket
support and performance parts availability. Having a lot of
parts to choose from is great for the enthusiast, but it can
also make it harder to figure out what parts and modifications
will work best. Building 4.6/5.4L Ford Horsepower on the
Dyno takes the guesswork out of modification and parts
selection by showing you the types of horsepower and torque
gains expected by each modification.

Author Richard Holdener uses over 340 photos and 185
back-to-back dyno graphs to show you which parts increase
horsepower and torque, and which parts don’t deliver on
their promises. Unlike sources that only give you peak
numbers and gains, Building 4.6/5.4L Ford Horsepower on
the Dyno includes complete before-and-after dyno graphs,
so you can see where in the RPM range these parts make
(or lose) the most horsepower and torque. Holdener covers
upgrades for 2-, 3-, and 4-valve modular engines, with
chapters on throttle bodies and inlet elbows, intake
manifolds, cylinder heads, camshafts, nitrous oxide,
supercharging, turbocharging, headers, exhaust systems,
and complete engine buildups.
Click below to view sample pages
Chap. 1 - Throttle Bodies
Chap. 2 - Intake Manifold
Chap. 3 - Cylinder Heads
Chap. 4 - Camshafts
Chap. 5 - Nitrous Oxide
Chap. 6 - SOHC Supercharging
Chap. 7 - DOHC Supercharging
Chap. 8 - Turbocharging
Chap. 9 - Engine Headers
Chap. 10 - 4.6 Engine Buildups
8-1/2 x 11"
Sftbd.
208 pgs.
340+ b/w photos
Item # SA115P
Price: $28.95
This is a great book and a
must have for anyone
considering modifying a 4.6 or
5.4 Ford for more power!
Click here to buy now!


4.6L / 5.4L - Throttle Bodies and Inlet Elbows
While many enthusiasts think of the throttle body as a simple air door, the reality is that there is
much more to a good throttle body than the sheer size. Whether single blade, as on the 2-valve
motors, or dual blade, like the 4-valve motors, the throttle body acts as a valve to control airflow
to the motor. One of the biggest misconceptions about throttle bodies is that installing a high-flow
unit (whether larger or of an improved design) will result in a gain in power. Building a better
throttle body, or at least one that flows more air than a production piece, is oftentimes a simple
matter of increasing the flow area. By this we mean that a 70-mm throttle body (like the 2-valve
unit from Ford Racing) will usually outflow a smaller 65-mm version (like the stock 4.6L 2-valve
piece). Unfortunately, the simple fact that one throttle body outflows the other does not
guarantee power gains. Power gains are only realized by increasing the flow through the motor,
not just improving a single component. The exception to this rule is when the single component
happens to be the restriction in the system that is limiting the engine’s ultimate flow rate.
Accufab throttle body and inlet 
system for the 2003 Cobra
Blower motors respond very well to
throttle-body upgrades, like this
Accufab throttle body and inlet
system for the ’03 Cobra.
An example works well here, as the 4.6L 2-valve motors seemed to respond well to throttle body
and inlet elbow (also referred to as upper intake) upgrades. Having run hundreds of tests on the
effect of 2-valve throttle body upgrades on everything from stock to supercharged combinations
(both centrifugal and positive displacement), it is safe to say that throttle body upgrades on the 2-
valve motors are a worthwhile endeavor. The same cannot be said (universally) about the 4-
valve motors, especially the naturally aspirated versions. Testing on stock and mildly modified 4.6
L 4-valve motors showed little, if any, power gains offered by throttle body upgrades. This does
not mean that the throttle bodies tested didn’t outflow their stock counterparts – they did. It simply
means that the stock throttle body was not the restriction in the inlet system. Obviously, the wilder
the combination, the more likely it is that a throttle body upgrade will be effective, as the stock
system was designed with a specific airflow (and power level) in mind. Exceeding that power level
with modifications to cylinder-head flow, intake manifold configurations, and cam timing will likely
increase the flow requirements of the engine, making a larger (or higher flowing) throttle body a
necessity.
Assortment of aftermarket performance throttle-body inlet elbows for the 4.6L 2-valve
Testing performed on all of the
available throttle-body inlet elbows
on the 4.6L 2-valve showed that they
all improved the power output over
the stock combo.
It’s not surprising that supercharging a motor will dramatically increase its airflow needs, but does
that automatically mean that a large throttle body will be necessary or beneficial? In the case of
the 4.6L 2-valve GT motors, the stock throttle body and elbow were certainly restrictive, even in
stock form. The stock throttle body and inlet elbow become ever more restrictive as the power
output of the naturally aspirated combination is increased, meaning that a throttle body upgrade
will be worth more power on a 360-hp 4.6L 2-valve motor than a 260-hp version. Adding a
centrifugal supercharger to the mix obviously increases the airflow through the throttle body
under pressure, but a throttle-body upgrade is still worthwhile. Running the stock throttle body on
a draw-through application with a Kenne Bell or a Ford Racing blower eliminates the inlet elbow
portion of the equation, but the power gains are still impressive as the air is now being drawn
(and not pushed) through the throttle body. Since a positive-displacement supercharger will
easily add 100 hp (or more), you’d better think about a larger throttle body to feed all that extra
airflow.

When considering a throttle body upgrade, think first about restrictions that may be present
upstream in the filter box, mass-air meter, and inlet tubing. If a restriction exists upstream of the
throttle body, it is unlikely that changes to the throttle body and/or inlet elbow will yield power
gains. Again, the higher the power output of the combination, the more restrictive the stock
components can become. A perfect example of this can be seen in Test 4 where we replaced the
stock induction system on the Kenne Bell supercharged early 4.6L 2-valve motor. On this
supercharged non-PI 4.6L, the stock throttle body represented a restriction, but so too did the
filter box and mass-air meter. It was necessary to replace the whole system to achieve the power
gains realized in the test. While the power gains on a stock early 4.6L may not have been
significant or even present, adding a supercharger to the mix will certainly tax the flow rate of the
stock components. Positive-displacement superchargers are especially sensitive to inlet
restrictions, as they cause a drop in boost pressure. The same is true of the inlet system on a
centrifugal supercharger, as the induction system should be as free flowing as space will allow.
Why limit the power gains offered by that supercharger with a restrictive induction system?
Factory twin blade throttle body on an 2003 Mustang Cobra Throttle Body Assembly on a supercharged Ford 4.6 liter 2 valve per cylinder engine
Running stock boost and power levels, the
factory twin-blade throttle body performed very
well on the ’03 Cobra motor.
Run on a draw-through application like this
Ford Racing supercharged 2-valve motor,
throttle body upgrades (like the 70-mm unit
from Ford Racing) can offer significant
power gains.
Next


This has been a sample page from

Building 4.6 / 5.4L Ford Horsepower on the Dyno Building 4.6/5.4L Ford
Horsepower on the Dyno
by Richard Holdener
The 4.6- and 5.4-liter modular Ford engines are finally
catching up with the legendary 5.0L in terms of aftermarket
support and performance parts availability. Having a lot of
parts to choose from is great for the enthusiast, but it can
also make it harder to figure out what parts and modifications
will work best. Building 4.6/5.4L Ford Horsepower on the
Dyno takes the guesswork out of modification and parts
selection by showing you the types of horsepower and torque
gains expected by each modification.

Author Richard Holdener uses over 340 photos and 185
back-to-back dyno graphs to show you which parts increase
horsepower and torque, and which parts don’t deliver on
their promises. Unlike sources that only give you peak
numbers and gains, Building 4.6/5.4L Ford Horsepower on
the Dyno includes complete before-and-after dyno graphs,
so you can see where in the RPM range these parts make
(or lose) the most horsepower and torque. Holdener covers
upgrades for 2-, 3-, and 4-valve modular engines, with
chapters on throttle bodies and inlet elbows, intake
manifolds, cylinder heads, camshafts, nitrous oxide,
supercharging, turbocharging, headers, exhaust systems,
and complete engine buildups.
Click below to view sample pages
Chap. 1 - Throttle Bodies
Chap. 2 - Intake Manifold
Chap. 3 - Cylinder Heads
Chap. 4 - Camshafts
Chap. 5 - Nitrous Oxide
Chap. 6 - SOHC Supercharging
Chap. 7 - DOHC Supercharging
Chap. 8 - Turbocharging
Chap. 9 - Engine Headers
Chap. 10 - 4.6 Engine Buildups
8-1/2 x 11"
Sftbd.
208 pgs.
340+ b/w photos
Item # SA115P
Price: $28.95
This is a great book and a
must have for anyone
considering modifying a 4.6 or
5.4 Ford for more power!
Click here to buy now!


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How to Rebuild 4.6- and 5.4-Liter Ford Engines
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How to Build Performance 4.6 Liter Ford Engines
Sean Hyland gives you a comprehensive guide to
building and modifying Fordís 2-, 3-, and 4-valve 4.6-
and 5.4-liter engines. You will learn everything from block
selection and crankshaft prep, to cylinder head and
intake manifold modifications. He also outlines eight
recommended power packages and provides you with a
step-by-step buildup of a naturally aspirated
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Performance Mustang Builders Guide 1994-2004
Regardless of which Mustang you start with, the
availability of high- performance parts is impressive. You
can build your Mustang for drag racing, road racing, or
improved street performance - and this book will show
you how! Author Sean Hyland uses over 300 photos to
explain how to upgrade your Mustang's engine,
suspension, chassis, transmission, rear end, brakes, and
body.
Performance Mustang Builders Guide 1994-2004
Price:
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