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Buy with confidence!
If for any reason
you're not
completely satisfied
with an item, simply
return it within 7
days and the
purchase price will
be refunded.
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We ship world wide.
All international
orders must be paid
online. Checks or
money orders drawn
on non-US banks will
not be accepted.
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Aftermarket EFI Systems
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Standalone systems like the F.A.S.T.,
Accel DFI GENVII, and Big Stuff 3 can
be used with specially modified intakes
like this one. They are a natural fit for
hot rods and restorations where there
is little or no existing wiring harness to
modify to begin with.
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The ever-increasing number of “do-it-yourself” horsepower enthusiasts helped to explode the
market for standalone EFI systems. These self-contained systems are designed to work
independently from any other vehicle systems. This means they work equally well in a classic
restoration project, dedicated racecar, or retrofit to most modern road-going vehicles. Almost all
stand-alone aftermarket systems are speed density to reduce the complexity of the MAF and its
necessary plumbing. These systems can be installed under the same inlet system as a common
four-barrel carburetor or use almost any OEM intake manifold.
Most of these systems allow the calibrator to view data in real time. This means that actual lambda,
spark advance, engine speed, load, etc. can all be viewed while making adjustments to the tables
on the fly. This reduces the down time associated with taking measurements, changing the file, and
reflashing the module before returning to take more measurements. Tuning in real time allows the
calibrator to instantly see whether a change was beneficial or not. For steady state calibration, the
ability to “arrow up/arrow down” quickly makes airflow modeling and finding MBT incredibly easier.
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The complexity of these systems, while intimidating to most beginners, pales in comparison to
modern OEM systems. Their calibration is surprisingly simple. Many programs have a tool to
estimate a starting VE map or come preloaded with one that is relatively close. If the system is
installed and wired properly, one should be able to quickly move on to the business of fine-tuning
the base VE map after confirming proper fuel system setup and injector modeling.
Starting with medium load and engine speeds before attempting to idle helps the calibrator identify
trends in the engine’s VE characteristics that can be extrapolated downward. Taking advantage of
the stable nature of the engine at elevated speeds, the VE map is adjusted until delivered lambda
equals target lambda at every cell in question. As long as cells exist in enough of the right locations
to build an accurate airflow model, fueling should be stable regardless of speed and load. Most
engines require more cells in the low engine speed range, since this is where the most drastic
changes in actual VE occur.
These necessary shifts can save a lot of time chasing an unstable idle fuel mix that is experiencing
misfires from being too far out of range. Likewise, break points necessary to accurately model the
airflow can be chosen to improve accuracy. Modeling VE at idle, slightly above, and below gives the
PCM the ability to maintain a constant lambda as VE changes, resulting in a more stable idle
condition.
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Only after steady state, part load, and idle are sufficiently calibrated should WOT tuning be
performed. Just like with idle, the trends seen in the base VE map should be extrapolated upward
for WOT as well. Again, the VE table is adjusted until actual measured lambda equals the
commanded values in the tables.
After all steady state values of the base VE table have been calibrated, we can move on to
transient fueling. Acceleration enrichment tables can now be adjusted to provide subjectively good
throttle response. Resist the urge to adjust the VE table at this point, since the changes in
measured lambda are a result of the wall wetting phenomena under changing conditions.
After the engine has had a chance to cool to ambient conditions, it should be started again to verify
calibration of the temperature- compensation curves. In a speed density system, these curves have
significant authority on delivered lambda. Many tuners mistakenly recalibrate the base VE table
when encountering poor lambda control the day after tuning. If there is a legitimate temperature or
weather change, and the tuner is confident in the previous day’s work, the only change should be
to the compensation curves. Ideally, the temperature compensation should be checked near the
limits of the predicted temperature range the vehicle will see to ensure proper operation under all
conditions.
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Many of these aftermarket PCMs have an “Auto Tune” feature that corrects fuel delivery based on
feedback from an onboard wideband oxygen sensor. For the hobbyist looking to just get something
running on a car, these help reduce the tuning effort and time. For those looking to perform a
proper calibration, I recommend that these be turned off. There is rarely any substitute for an
accurate wideband and an experienced calibrator making the proper mathematical adjustments. I
always get better results by holding the engine in steady state on a dyno and making the necessary
corrections versus allowing the included strategy to “learn” the proper tune. Remember that the
engine is almost never steady state while driving on the road, so the learning function never really
gets a good look at any particular trim cell for very long. If the steady state calibrations are done
correctly, there will be little work for the closed loop correction later anyway. This leaves less room
for error or drivability problems a week later.
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Accel DFI
The Accel DFI GenVII standalone EFI system is one of the most widely used and flexible aftermarket
engine controllers. Scaling of the base maps is infinitely adjustable with respect to engine speed
and load. Load can be configured as in-Hg, kPa, or TPS (true alpha-N) and can be used with any
standard GM MAP sensor to accommodate up to 30 psi of boost. TPS range adjustment can be
conveniently done from the driver’s seat by simply pressing the pedal in the calibration mode.
All base fuel calibrations are referenced from predicted air mass. Even though the actual mass flow
number is not directly shown to the tuner, it is being calculated based on base VE, MAP, and
modeled air temperature at the port. The result is an OEM-like calibration ability for lambda control.
A properly calibrated GenVII system should drive just like a stock vehicle regardless of weather or
load changes.
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Previous | Next
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This has been a sample page from
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Engine Management: Advanced Tuning
by Greg Banish
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As tools for tuning modern engines have become more powerful
and sophisticated in recent years, the need for in-depth
knowledge of engine management systems and tuning techniques
has grown. Tuning engines can be a mysterious art, as all
engines need a precise balance of fuel, air, and timing in order to
reach their true performance potential.
Engine Management: Advanced Tuning explains how the EFI
system determines engine operation and how the calibrator can
change the controlling parameters to optimize actual engine
performance. This book takes engine-tuning techniques to the
next level. It is a must-have for tuners and calibrators and a
valuable resource for anyone who wants to make horsepower with
a fuel-injected, electronically controlled engine.
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Click below to view sample
pages from each chapter
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Author Greg Banish is a calibration engineer with extensive
aftermarket performance calibration experience. With over a
thousand unique calibrations performed over five years, he has
worked with enthusiasts and OEMs alike to improve the
performance and driving behavior of a wide range of vehicles.
The book contains detailed equations, graphs, and illustrations.
Also included are valuable and practical examples, including real-
world examples based upon the author’s experience that will help
more advanced readers apply this new information to situations
that are commonly seen during calibration.
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1 - Introduction to EFI
2 - Basics of Fuel Injection
3 - Carbureted Engines
4 - EFI System Inputs
5 - Fuel Injectors
6 - EFI System Fuel Control
7 - Ignition Systems with EFI
8 - Data Logging
9 - EFI System Calibration
10 - Idle Calibration
11 - Tuning for More Power
12 - Fine Tuning EFI
13 - Tuning EFI with Blowers
14 - Tuning Ford EFI Systems
15 - Aftermarket EFI Systems
16 - INCA OEM Calibration
17 - External EFI Controllers
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8-1/2 x 11"
Soft bound
128 pages
200 color photos
Item # SA135
Price: $22.95
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Click here to buy now!
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Other items you might be interested in
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Performance Ignition Systems
Performance Ignition Systems is a comprehensive guide to
significant increases in power, mileage and overall engine
performance by custom tuning electronic or breaker point
ignition systems. Sections include increasing engine power,
efficiency, mileage and longevity using upgraded ignition
equipment, judging and troubleshooting ignition components,
including diagnosis and reading spark plugs, electrical wiring
problems and solutions, tech tips and custom wiring for the
ultimate performance ignition and much, much more.
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Price:
$18.95
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Building & Tuning High-Performance Electronic Fuel Injection
Provides specific, detailed info on what fuel injection is & how it works.
Covers buying and installing the proper system for your performance
application. After a description of what programmable EFI offers its
users, author Ben Strader (founder and senior instructor of EFI
University) gives a detailed account of what you want to accomplish with
your EFI system, then shows you how to get there.
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Price:
$18.95
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Turbochargers
How to select and install the correct turbo for big or small
horsepower gains. Discusses turbocharger design, sizing,
matching, controls, carburetion, exhaust, ignition,
intercooling, marine and high altitude applications. The most
comprehensive book available. Turbo suppliers and kit
maker addresses are included. “Everything you could possibly
need to know about turbochargers for automotive applications
is in this book.
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Price:
$18.95
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Shipping is combined and discounted for multiple item purchases!
Buy more and save on shipping!
We ship Worldwide! See International Shipping for more information!
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Search Our Store for More Great Ford, Lincoln & Mercury Items!
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FAST AND EFFICIENT SERVICE
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we would like to be to treated. We strive to describe all items correctly. You have many options
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within one business day. It is our goal to serve the customer before, during and after the checkout
process. Why gamble with your money and purchase from other sellers? We look forward to doing
business with you now and in the future.
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FAST SHIPPING
Items usually ship within one business day of receipt of payment! We keep large quantities on hand
and have a state of the art inventory management system to ensure your items are in stock and
ready to ship.
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YES, WE HAVE A RETURN POLICY
Satisfaction is guaranteed. Our store has a NO HASSLE RETURN POLICY within 7 days of
purchase. Your exchange will be processed upon receipt. If you are not satisfied with your
purchase, our knowledgeable team will do their best to make sure you get what you are looking for.
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QUALITY AND AFFORDABILITY
Why pay retail when you can save money and benefit from our purchasing power? We stock large
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s/h. The more you buy, the more you can save!
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SHIPPING
Standard shipping is a flat rate of $4.95 to anywhere in the United States with USPS Media Mail.
Priority Mail shipping is available for an additional $3.00, or $7.95 shipping. Shipping is combined
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INTERNATIONAL SHIPPING
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Europe, Australia, Asia, Japan and South America for $14.95. Shipping is combined and discounted
for multiple items purchases as follows: first item regular price shipping, add $1.95 for each
additional item. All international orders must be ordered and paid online, as we can no longer
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PAYMENT & SALES TAX
We accept Paypal, Visa, Mastercard, Checks and Money orders. Paypal is the preferred form of
payment. Our online shopping cart system is powered by PayPal, the most secure way to send
payment online. Iowa residents must add 7% sales tax.
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If you have any questions or comments please feel free to contact us. We look forward to serving
you and fulfilling your needs.
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Thanks for your business!
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MRE
PO Box 47
Grinnell, IA 50112
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