Banks Power Twin-Turbo: Forced Induction- Twin Turbos Small Block Chevy - Manual (Page 4)

4
96800 v.1.0
Your Banks Sidewinder Twin-Turbo
system has the potential to make
considerable power, but only if the
vehicle’s support systems are upgraded
to match. We recommend you consider
making the following modifications if
you have not already done so.
FUEL SYSTEM
A quality high-performance EFI fuel
pump capable of producing the
recommended injector pressure and
fuel flow volume for the anticipated
power level will be required. Check
with your EFI manufacturer for their
nozzle flow rates and pressures. As a
general rule, an engine at WOT under
load will use
1 ⁄ 2 pound of gasoline per
horsepower per hour.
Thus, an 800-horsepower engine will
require a fuel-flow capacity of 400
pounds per hour total flow from the
eight injectors. This is a minimum
requirement, as the pump should have
some additional flow and pressure
reserve to allow for pressure
regulation and high demand
conditions. Install a fuel pressure
gauge to monitor pressure while
tuning. Pressure is ∆P injector. If your
injector needs a ∆P of 45 psi and you
will be running 10 psi of boost
pressure, the pump will need to make
55 psi of pressure at the necessary
fuel flow rate, plus 5 psi for regulation.
The fuel tank pick-up line or outlet
fitting should be at least as large as
the fuel pump inlet, typically a –10 or
–12 line size. If at all possible, mount
the pump in the rear of the vehicle,
close to the fuel tank. A high-flow fine
mesh fuel filter should be installed at
the fuel pump inlet. Check with the
pump manufacturer for filter micron
size.
High-volume/high-pressure electric
pumps must be supported by an
electrical system capable of providing
the rated pump amperage and supply
voltage. Check that the wire gauge
and fuse amperage is appropriate for
the pump selected. Most ECUs switch
the pump on and off through a relay
tied to the ECU’s ignition circuit.
EXHAUST SYSTEM
Turbochargers respond quicker and
will produce more boost with
minimum backpressure. If possible,
use a 3-inch-diameter outlet pipe from
each turbocharger. In a minimum
space situation, you may reduce to
2
1 ⁄ 2 -inch-diameter off of each turbo,
increasing to 3 inches as soon as
possible, but power will be reduced. In
a racing application, keep the pipe size
3 inches or larger, and as short as
practical. On a street vehicle, mufflers
should be a low restriction chambered
design (no glass packs) with inlet and
outlet sizes at least 3 inches. Keep the
number of bends to a minimum, and
as free flowing as practical. Stainless
steel tubing is not necessary, but will
last a lot longer.
The wastegates are provided with V-
band outlet connections for welding to
1
3 ⁄ 4 ” tubing. On a street driven car, the
wastegates’ outlet tubes can be
merged into the turbocharger outlet
tubes 12”-24” downstream of the
turbos. When doing this we
recommend some kind of slip joint or
bellows be placed in the wastegate
outlet tubes to minimize tube
distortion or cracking from different
thermal expansion rates.
Our turbo system is designed with the
wastegate outlets pointing out toward
each side. If necessary for the vehicle
application, the wastegates may be
rotated to another position, but new
actuation hard-line tubes will have to
be made.
Section 1
ENGINE SUPPORT SYSTEMS