stock fuel system on the 3rd generation RX-7, with an
appropriate ECU upgrade, can support upwards of 380HP*
on the stock motor. The first component in the system
to need replacing is the stock fuel pump. We offer an
upgraded stock replacement pump which is an easy bolt
in and can support over 500HP*.
Your next limitation in the fuel system comes from the
injectors themselves. The stock fuel system uses two
550cc injectors for primaries and two 850cc injectors
for secondaries which come on at higher RPMs. Those injectors,
maxed to their extreme limit (100%), will support approximately
420HP* at stock fuel pressures. You don’t want
to push the injectors beyond 80%-85% duty cycle though
for reliability reasons. To support more power on street
driven cars, we recommend using additional injectors.
For those serious about RX-7 performance, looking for
more power and more precise tuning we also offer two stand
alone ECU systems, the Haltech and the Power FC. Stand
alone ECUs are only recommended for the more advanced
tuners, those with experience, with access to a dyno and
a wide band air-fuel meter.
Last but definitely not least, make sure you change your
fuel filter at least every 30,000 miles. No matter how
big of a fuel pump or how many injectors you have, you
won’t get the fuel you need unless you have a good,
fresh fuel filter.
horsepower at the flywheel
fuel pressure regulators are the most reliable,
stable fuel pressure regulators we’ve ever seen.
They are fully adjustable and can bypass enough fuel
for any size pump you can throw at them. They come
standard with dual fuel inlets for a variety of plumbing
techniques. The SX regulators are designed for use
with -6 AN fittings. For those using a standard 5/16" (8mm)
hose we offer a rubber hose adapter kit which includes
all the fittings and barbs necessary.
Fuel Pressure Regulator - SX-6
5/16 Hose Adaptor Kit for SX-6
SX-10 regulators are designed for use with -10 AN
fittings. For those using a standard 5/16" (8mm)
hose we offer a rubber hose adapter kit which includes
all the fittings and barbs necessary. The
SX-10 regulators also have a 1/8" pipe threaded conection
for fuel pressure gauge connection or nitrous fuel
tap. This is the same one we use on our RX7.COM
championship drag car.
Fuel Pressure Regulator - SX-10
Hose Adaptor Kit for SX-10
Mazda uses Denso injectors in the FD Rx7.
These are the ones to have if your FD has sprung a
leak through the side on one of your injectors.
At times, the primary injectors on 1993-95 RX-7s
will start to leak fuel after a years of use due to the extreme heat load that they are exposed to.
If your car
has the original injectors, pay attention! If you smell
raw fuel under the hood, investigate the problem and
replace the injector o-rings or injectors with these before it catches
fire. The 850cc injectors can be used
on the primary fuel rail with minor machining. This
upgrade allows 21% more fuel to be available for tuning
your street ride. This will give enough fuel for up
to 400HP to the ground and is a favorite for twin-turbo
and medium sized single turbo systems.
To use 850cc injectors in the primaries, you must
have a fully programmable engine management system
like a PowerFC or Haltech.
a solution for those with leaky injector o-rings.
As we all know, heat breaks down rubber over time.
Unfortunately, turbocharged rotary engines make quite a bit
of heat and over time the injector o-rings harden
and can potentially leak. Any time you’re doing
major under-manifold service it is advisable to
replace these o-rings. From Mazda these o-rings
will total over $120. We have them here as a complete
kit at an unbeatable price.
Injector O-ring Kit - Complete for 4 injectors
stock fuel pump was designed to handle the fuel requirements
at near stock levels. Once you’ve
upgraded the car to a point where more fuel is required,
need to address this weak link in the system. We use
a special, high flow fuel pump, made by OE manufacturer
Denso in Japan, which exactly replaces the stock fuel
pump. This dual stage unit takes less than an hour
to install, doesn’t
make any more noise, is extremely reliable, requires
no cutting, welding, new lines, or anything else. It’s
also the highest flowing unit we’ve
tested that doesnít
make the car run rich at idle, unlike other ‘bolt
our next generation fuel pump: it’s often hard to
make a good thing even better. Our previous generation
competition fuel pump has long been the standard
of the industry. Now we’ve made it even better.
The most important facts are still the same. It’s
still a direct bolt-in application and still a quality
Denso pump. Volume has always been the most of any
drop in pump, but now has been enhanced even more
(17% better than Walbro). To make it even better,
we’ve included an install kit. This kit includes
an OE inlet filter, o-rings, hose connections, hardware
and even a ground wire for a wiring supplement ($45
value). All these features and at the same price.
The pump has been tested to support 500HP at the flywheel
(at 40 PSI base pressure) and is a good upgrade for those
with upgraded ECUs and/or those adding additional injectors.
|Old RP Pump
|New RP Pump
Competition Fuel Pump
you running a high current external tank fuel pump
or dual intank units? If so, this is the relay you
need to ensure proper voltage gets to the pumps.
The original wiring is designed to not exceed 30A
of power. A full race fuel pump can easily push this
limit, especially at full boost. This relay is rated
at such a level that there is no way to exceed its
rating. Keep in mind: This is a competition part
that is only needed on dual pump or external pump
Fuel Pump Relay
not starve your engine for fuel! One of the most
common maintenance mistakes we all make on our cars
is not changing the fuel filter regularly. Fuel flow
is absolutely imperative on any car, especially on
turbocharged Wankels. Old fuel filters allow debris
to slip past and clog injectors, impede fuel flow
and put your engine at risk. The recommended interval
is 24 months or 30,000 miles. This RP aftermarket
filter is a perfect fit for the original and has
been used on countless cars.
raw gasoline under the hood of your car? This just
might be the culprit. The pulsation damper
is a necessary part of the fuel system, but commonly
ages and starts to leak. The results have often been
an underhood fire. This part is commonly replaced
during engine installations, vacuum hose upgrades
or primary injector replacement.
Fuel Pulsation Damper
of poor mileage on your RX-7? Here’s a
solution. The oxygen sensor is out of sight and
out of mind. On many cars, it has never been
replaced. Unfortunately, O2 sensors lose accuracy
with time and eventually ends up hurting gas
mileage. Replacing this part every 30,000 miles
will keep this from ever becoming an issue. Some
have seen improvements of as much as 8mpg. Our
replacement is a direct fit and saves about $100
over the Mazda unit. Buy one today and save!
Aftermarket O2 Sensor
are ballast resistors for using low reisistance injectors
with a high resistance computer application. One
resistor is used per injector and is wired in series.
subject to change without notice