RRE's Mitsubishi Eclipse Fuel System Upgrades

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Eclipse Index

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S-AFC GEN 3 NEO

$360

The AFC takes the pulse from the Mass Airflow Sensor and either speeds it up or slows it down at different RPM points to make the ECU run richer or leaner. All by it's self it can only give you a little more bottom end by leaning it out some. If you try to richen the top end you will just hit fuel cut (100% fuel inj. pulse) sooner. One use is to cut out the restrictions in the lower half of the MAS (leaner) and then use the AFC to richen things back up.

The biggest gain that it allows is to install larger injectors (richer) and the AFC gets adjusted leaner to compensate. This also raises the point where you hit fuel cut since the ECU sees less air flow.  It allows 1st Generation Eclipse owners to convert to the larger air flow meter from the 95-99 Eclipse. The 2G air flow meter works well to 400 hp.

Installation is tapping into a minimum of 4 wires and cutting one to intercept the air flow signal. This is all done at the ECU. There are 8 rpm points to adjust the air flow + /- 50%. You really need both an Exhaust Gas Temperature gauge and also monitor Oxygen Sensor voltage to properly tune it. Be warned that this device can be used for good as well as evil. You can blow up your motor if you don't know what you are doing.

Walbro Fuel Pump Upgrades

$100

For additional flow specifications and some low budget modifications you can do your self to increase flow with any pump see "tech tips"

Larger Fuel Injectors

More fuel will allow you to run higher boost. But you cant just put in bigger bigger injectors with out some way to control them, you would just run rich all the time. The ECU will still trigger the bigger injectors as if they were still stock. Each time they open however, more fuel will flow out. The car would be slower and you would just hit the ECU's fuel cut. A fuel controller like the AFC will trick the ECU into thinking that there is less air flow. It will then trigger the bigger injectors less and even things out. Since the ECU does not see all of the actual air flow, you wont hit the fuel cut off and you'll get better ignition timing advance.

What Size Injectors?

Just about everyone you ask will give you a different answer. Here is ours. 550cc injectors are a minimum to have serious fun with. Which size for you all depends on the octane of your fuel and how much boost you will be running. Bigger injectors allow you to run ridiculous amounts of boost on cheaper gas. If you are running race gas when you are having fun or if you run higher than stock fuel pressure, you can get away with smaller injectors. East coast kids get 93-94 octane gas to play with, while the west coast gets stuck with diet light pretend 91 octane junk. Keep in mind also that living your life 1/4 mile at a time you will need less fuel than if you live your life in 20 minute run groups in open track sessions.

$ 440

$ 440

OEM Injector O-ring Seals

$ 14

$ 10

AEM Fuel Rail

AEM High Volume Fuel Rails are CNC machined from 6061 T-6 billet aluminum and feature a 1/2-inch fuel bore capable of flowing enough fuel to support most high-performance engines. This larger bore also dampens the back pulse created by oversized injectors in high-output applications. The AEM fuel rail also works perfectly with stock injectors. Each fuel rail includes an additional port for the installation of a nitrous set-up or external fuel pressure gauge.  AEM’s High Volume Fuel Rail kit includes new injector O-rings, fuel line fittings, comprehensive installation instructions and AEM decals.

• No additional parts required for installation
• Utilizes original fuel hose
• Stock fuel pressure regulator mounts directly to fuel rail
• Available in blue, red and silver with laser-etched graphics
• AN Fuel rail adapter to -6 only

Price $180  For 89-99 Eclipse Turbo only.  Please specify color when ordering.

AN adapter fitting  Price $40

Additional Replacement O-rings for Fuel Rails   $2 each
(Note these are not the injectors o-rings, but the o-rings that goes at the end of  the fuel rail.)

For fuel rail installation instructions please click here...
For AN adapter fitting instructions please click here...