I install the EGT probe before or after the turbocharger? I’ve
heard before is best, but I saw an EGT mounting hole in an aftermarket
exhaust system, and now I’m wondering if I can safely
mount it after the turbo charger?
- The ONLY correct position for
the EGT probe is before the turbo in the exhaust manifold. There
are two reasons for this: response time and accuracy. If the
probe is mounted far away from the manifold, the lag between
when the probe will register an increase in temperature, compared
to the reading if the probe was placed in the manifold, can
result in misleading EGT numbers. When used in conjunction with
the Juice, this is of particular concern since the module needs
to be able to de-fuel as quickly as possible to reduce EGTs
- The second reason is accuracy. Putting the probe after the
turbo can create inaccurate readings because the exhaust gas
will cool as it travels farther away from the manifold. This
discrepancy can be as much as 250 degrees, which is far too
big a margin of error. Also, depending on the power upgrades
you have made, the turbo itself may throw off the accuracy of
a post-turbo reading. If the turbo is a restriction, excess
heat will build before the turbo as hot exhaust gas backs up,
while post-turbo EGT will be much lower - resulting from the
reduced exhaust flow which cools even faster than it would in
a balanced system. This situation can be particular dangerous
because excess heat will quickly build in the motor while temperature
readings after the turbo will seem almost too cool.
- EGT stands for exhaust gas temperature, and is the
single most important indicator of how a diesel engine is performing.
Unlike a gasoline motor, a diesel motor will continue to make
power as more fuel is added. As more fuel is added, heat will
be generated until the motor just gets too hot and things start
to melt. This is a situation to avoid. Exhaust gas temperature
is the ideal measurement of how hot the motor is, since temperature
fluctuations in the gas are almost instantaneous. You should
consider using the Edge Attitude or installing an EGT gauge
even if you make no performance upgrades, since EGT is such
an important indicator of engine load. This is particularly
true if you tow.
I hear people talking about pressure boxes and timing boxes.
What are they talking about?
- There are basically three ways for a box to make
more power in a diesel: timing, duration and pressure. Some
boxes just do pressure, some do timing and duration and some
do all three. If a box does just pressure, the box is fooling
the truck’s computer into thinking it has less fuel pressure
than it really does. In response, the computer increases the
fuel rail pressure and so when the injectors fire, since there
is increased fuel pressure, more fuel is released into the engine
and additional power is created. This is the simplest type of
power upgrade module and we have found it works very well for
most Dodge applications and the Ford 7.3 Powerstrokes, as long
as your power gains are limited to less than 70 horsepower.
We have found raising fuel pressure on Ford 6.0 and the Duramax
puts too much strain on the fuel system and so we do not make
pressure boxes for these vehicles. Also, as mentioned, 70 horsepower
is about the most you can safely gain in the Dodge and about
50 horsepower is what you can get out of the 7.3 Powerstroke.
As the name implies, a timing and duration box changes the timing
of when the injectors fire, either advancing or retarding timing,
as well as how long the injectors stay open when they fire.
This takes considerable sophistication when it comes to understanding
performance tuning, as well as vehicle communication systems.
We have found re-tuning through timing and duration works very
well on the Duramax and the Ford 6.0. When done correctly, it
can also produce big gains on most of the Cummins motors; however,
these gains will usually require additional aftermarket enhancements
to the vehicle.
level should I tow in?
- The only levels suitable for towing are levels 1
and 2. Only use level 2 if you are towing a light load. Never
tow without an EGT gauge or an Attitude monitor. If you want
to tow in a higher level, you must make significant engine and
transmission upgrades beyond just a chip in order to handle
the increase in power. It’s that simple. Even though the
Attitude monitors EGT and will automatically de-fuel to prevent
excessive EGTs, you should still only tow in level 1.
my Juice work without an EGT probe hooked up?
The module will function normally, however, you will not have
the safety feature of monitoring your EGTs and the Juice will
not be able to backdown EGTs.
seems every product I see advertised claims 100+ horsepower
gains, yet when I have driven a friend’s truck that
has one of your competitors’ products, the performance
just doesn’t seem that good. How come?
- When it comes to horsepower claims there are many
people in the industry that state horsepower and torque gains
using methods that while accurate, are not particular relevant
to what the enthusiast is looking for in an upgrade. The most
common example of this is flywheel or crank horsepower claims
vs. rear wheel numbers. If your crank shaft was connected
to the road, this would be great a number to know. But in
fact, your crank shaft is connected to other components, like
your transmission for example, that act like a parasite and
reduce power. What you really want to know is horsepower gains
at the wheels. A typical truck uses about 30% of its power
turning the gears, drive shaft and other components that sit
between the flywheel and the tires. This means someone claiming
a 50 horsepower gain at the flywheel is probably only making
about a 35 horsepower gain at the wheels. Not bad, but not
really as advertised. The second popular method of “super
sizing” horsepower claims is by quoting horsepower gain
numbers based on some totally unusable part of the power band.
Who cares if all your power gain comes after 3,000 RPM? When
do you ever cruise on the highway at redline? (Certain Edge
engineers, who are now strictly forbidden by our insurance
company to drive company vehicles on public roads, being the
exception). What you should be interested in is usable power
gains in the low and mid range. This is particularly true
if you tow. Before getting mesmerized by that 100hp claim,
look at a before and after dyno graph and see if the gains
are really where you drive.
a CARB “Executive Order” is Important to Consumers?
- The California Air Resources Board (CARB) requires
manufacturers selling emissions-related products for on-road
use in California to obtain “certifications” for
such components. By so doing, products are assigned an “Executive
Order” (E.O.) number, indicating successful completion
of emissions and related tests in an authorized testing facility.
Failure to obtain an E.O. can result in fines and the inability
of a vehicle to pass routine “Inspection and Maintenance”
(I&M) tests, conducted by the state of CA. I&M tests
are also being required in other states and in major air quality
regions throughout the country. In addition, emissions-related
specialty parts require a CARB E.O. when registering, re-registering
or transferring title of a vehicle. Nationwide, the Federal
Environmental Protection Agency (EPA) has similar requirements
for emissions-related specialty aftermarket parts. Generally,
parts that have been issued a CARB E.O. are acceptable by
the EPA, inasmuch as CA emissions standards are typically
more stringent than Federal standards. Regardless of from
which perspective the CARB or EPA may be viewed, the installation
of an emissions-related part or system not supported by a
CARB E.O. is considered a violation of the “tampering”
provisions in both the CA Vehicle Code and Federal Clean Air
Act. Parts with a CARB E.O. are exempt from these provisions
and clearly the safest choice for consumers. Edge Products
fully supports efforts by the CARB and EPA to make certain
that emissions-certified products are available to the specialty
parts customer. In fact, Edge is able to meet these requirements
while delivering the performance benefits for which our products
are widely known. On a consistent basis, Edge applies for
and obtains CARB E.O.s for its emissions-related products.
It is Edge’s intention to provide customers with up-to-date,
technologically state-of-the-art, street-legal parts that
comply with regulatory requirements while preventing problems
for the consumer when engaging in emissions test programs
and registration procedures mandated by governmental agencies.
the Use of Edge Products in California.
- Edge has submitted their full line of aftermarket
performance products for testing to ensure they are in compliance
with the California Air Resources Board’s (CARB) standards.
Currently, all of Edge’s products for gasoline-powered
vehicles have received CARB Executive Orders (E.O.s) and are
legal for sale and use on gasoline-powered pollution-controlled
vehicles in California. The rest of Edge’s products
have been submitted for testing or are in an E.O.-pending
process. We are currently testing products to become compliant.
This page will be updated as applications move to the next
stages of the CARB and E.O. process.