ATI ProCharger (supercharger)
on a 350Z ('03 or '04)
doing any tuning, it's best to get a thorough understanding
of just how the EFMU/DFMU works. A good place to start is
to join 350Z
Frenzy Forum, do a search for the username "jesseenglish",
and read all his posts concerning the ATI ProCharger. You
will find excellent explanations of how everything works
and a checklist with photos of crucial items to check when
installation is complete (even if someone else does the
installation, you can still check everything out)!
someone else does the installation and/or tuning, make sure
they know how the Aeromotive DFMU works in conjunction with
the 350Z's ECU! Just because someone has tuned an ATI supercharger
on a Mustang or Vette, doesn't mean they can do it right
for a 350Z! If you do anything, err on the rich side! Lean
= detonation = destroyed engine. Tuning MUST be done with
a wideband O2 sensor. Jesse's information
is a must read for tuning the ProCharger!
is a very informative e-mail Jesse received from Brett Clow,
Aeromotive Tech Department, that explains exactly how the
Aeromotive DFMU works.
the Aeromotive DFMU Works
DFMU scale is set by ATI before shipping for a 7 psi boost.
The scale controls the range of boost for each slider. Each
slider on the DFMU should activate at the following boost
levels for the 350Z application.
can verify the scale adjustment with a low pressure source
and regulator. The 5th slider light should activate at 5.6
presumes that you are achieving the full 7 psi boost, so after
rough tuning the DFMU, you may want to take a max boost reading
at redline. If it doesn't read 7 psi, you'll need to check
for leaks or restrictions in the intake plumbing, check your
PCV/vacuum lines for leaks, make sure the bypass valve is
working properly, and make sure your serpentine belt isn't
after checking everything out, you can fine tune the scale
by taking the maximum boost you are achieving at redline and
divide it by 5, then multiply the result by 4, and that number
is the number at which the 5th slider should activate. You
can make your scale adjustments with a low pressure source
and regulator. For instance, if your max boost is 6 psi, the
scale increment becomes 1.2 and the 5th slider should activate
at 4.8 psi.
the scale is set, you can proceed to fine tuning the air/fuel
ratio. Here is where you need to map the A/F with a wideband
O2. Your target A/F at the activation
of each slider should be about 11.5 (slightly rich) so that
it does not exceed 12.5 just before the activation of the
next slider. Mine actually holds around 12 from 3,600 rpm
to 5,000 rpm, and then a steady 11.6 with a slight upswing
to 12 at redline. Remember that these A/F settings are done
at WOT (put the pedal all the way to the metal).
is usually done on a dyno, but make sure your engine doesn't
get heat soaked. About three pulls, and then let things cool
off for a bit. A heavy duty, industrial fan helps to keep
air flow around the engine and aid cooling. If you decide
to do the tuning on the road (typically less accurate), you'll
need a method to record the rpm and wideband O2
data (boost recording would be good too), and a good, safe,
straight track for running at WOT.
highly recommend a wideband O2 gauge,
boost gauge, and fuel pressure gauge as minimum equipment
to monitor the health of your system. It's reassuring to know
all the time if your system is happy.
additional piece of safety equipment to consider for any FI
installation is the J&S Ultrasafeguard, it's a bit expensive,
but a lot cheaper than rebuilding a destroyed engine. Here's
a link to their web site:
people with the ATI ProCharger have their systems set up with
various combinations of larger fuel injectors, the TechnoSquare
ECU flash for an FI application, and the Apexi S-AFC II. Check
the major 350Z forums for information on these setups.
it right, and enjoy all that horsepower safely!
(click on a link):
document of entire text of the
ATI ProCharger Install Article