RX-7 Glossary
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ABS - Anti-lock Brake System - prevents skidding and
enhances car control during braking; the 3rd gen RX-7 has a 3 channel (two
front, one rear) system
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AIR PUMP - Pumps air into the exhaust and main
catalytic converter to reduce pollution
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ANTIROLL BAR (Sway Bar, Stabilizer Bar) - Suspension piece that
limits the amount of body roll while cornering
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ASP - A Street Prepared, SCCA racing class for highly modified cars
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AST - Air Separation Tank - removes bubbles from
coolant, often cracks and leaks, see the Coolant Tank Elimination how-to to
get rid of it
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ATDC - BTDC - After (Before) Top Dead Center, term
used for adjusting ignition timing
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BLOW-OFF VALVE - valve that bleeds off excessive
boost pressure when the throttle is closed (like between shifts) by dumping air from the
intake
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BOOST - Intake pressure created by the turbocharger - given in pounds per
square inch (PSI) or bar (metric), see the Manual Boost Controller how-to
to adjust boost
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BOOST CREEP - Slow rise of max boost at high rpm -
caused by inadequate size of the wastegate
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BOOST SPIKE - Sudden rise in turbo boost pressure, caused by second turbo
coming online around 4500 rpm in modified 3rd gen RX-7's, see the Manual Boost Controller how-to for a way to reduce spiking
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CFDF - Center Force Dual Friction clutch, recommended by the mail
list but seems inadequate for drag racing
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CRANE HI-6 - Ignition amplifier, increases strength
of ignition spark, only needed when running higher than stock boost
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CYM - Rare RX-7 exterior color, Competition Yellow Mica
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ECU - Electronic Control Unit - the computer brain
that controls the engine
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EFINI - Japanese name for the 3rd gen RX-7
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EGR - Exhaust Gas Recirculation valve - pollution
control device that injects a small amount of exhaust gas into the intake stream to
decrease combustion temperature and nitrous oxides
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EVC - Electronic Valve Controller - Computer controlled boost controller
(controls the wastegate)
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EXHAUST SYSTEM (3 SECTIONS):
* PRE-CAT - Pre-catalytic converter - the first part of the exhaust -
decreases pollution at start up
* CAT - Main catalytic converter - the middle section of the exhaust
* CAT-BACK - The last section of the exhaust (from the CATalytic
converter BACK) - usually includes a muffler
* DOWN PIPE - Replaces the Pre-Cat for better exhaust flow
* MID PIPE - Replaces the main catalytic converter for better exhaust
flow
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FCD - Fuel Cut Defenser - prevents the ECU from
cutting fuel to the rear rotor when boost pressure exceeds approximately 11-13 psi,
should only be used with GReddy FCON because it tells the ECU boost is lower
than actual
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FC3S - Another term for second generation RX-7 (1986 - 1991)
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FD3S - Another term for third generation RX-7 (1993 - now)
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FCON - Fuel CONtroller - Piggyback fuel controller that prevents a modified engine from running lean by
fooling the ECU into supplying more fuel to the engine when at full throttle
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GReddy - After-market performance parts manufacturer
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HKS - After-market performance parts manufacturer
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INTERCOOLER - (IC) A radiator-like device that hot, compressed air from
the turbo flows through for cooling - increases horsepower and lowers risk of detonation
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KOKO - Key On, Key Off - can temporarily cure some
boost problems, it does a soft reset of the ECU
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LSD - Limited Slip Differential - sends torque to the wheel that is
spinning the least - all 3rd generation RX-7's have them
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MAP - Manifold Absolute Pressure sensor (manifold pressure)
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MM - Mostly Mazda, after-market parts maker and
repair shop
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N/A - Normally Aspirated (non-turbo), all 3rd gen
RX-7's are turbocharged
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NOS - Nitrous Oxide System - Nitrogen Oxide gas (and usually
additional fuel) is injected into the intake to increase power
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O2 SENSOR - OXYGEN SENSOR - tells the ECU how much oxygen is present in
the exhaust, more O2 = lean mixture, less = rich (not used during wide open throttle)
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OEM - (OE) Original Equipment Manufacturer
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PEG - (PEP in 95) Popular Equipment Group (Package) -
Sunroof, Rear Cargo Cover, Leather. In 1995, fog lights were added to PEG. Reading from
the 1994 window sticker: 1PE POPULAR EQUIPMENT GROUP $1800
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PFS - Peter Farrell Supercars - After-market
performance parts manufacturer
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PIGGYBACK ENGINE CONTROLLER - A non-stand-alone engine/fuel
computer that works with the stock ECU such as the EFI PMS. The Motec and Wolf 3D computers are
stand-alone--they eliminate the stock ECU
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PMC - Powertrain Management Computer (PFS Purple Computer) -
Piggyback engine control computer that controls boost,
timing, and fuel, very programmable; sold by PFS, made by EFI
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PMS - Programable Management System by EFI Systems - piggyback engine control computer that controls boost,
timing, and fuel, very programmable, same unit as the PFS PMC
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PROFEC - GReddy boost controller - electronically
controls the wastegate to control boost, uses "fuzzy logic" to learn your car's
boost pattern
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PROFEC B - Similar to PROFEC but less programming and no "fuzzy
logic"
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R1 (93), R2 (94,95) - Sport tuned suspension version of the 3rd
generation RX-7
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RB - Racing Beat - High quality Japanese parts
supplier
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REBIC III - Used to control additional fuel injectors - GReddy
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REBIC SIM - Allows more control of REBIC III - GReddy
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SCCA - Sports Car Club of America
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SS - Stainless Steel
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SST - Special Service Tool, term used in the RX-7
Workshop Manual
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TOURING - Equipment option (leather interior,
sunroof, Bose sound, etc.)
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TPS - Throttle Position Sensor
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VR - RX-7 exterior color, Vintage Red
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WASTEGATE - Valve that controls turbo boost pressure by allowing exhaust
to bypass the turbo
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WFO - WOT - Wide F'ing Open, Wide Open Throttle
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Y-PIPE - Air pipe that collects air from the
two turbochargers and connects to the plastic crossover tube (which often cracks at
both ends). The
Efini Y-pipe comes with a metal crossover tube and eliminates the unreliable
rubber coupler between the Y-pipe and crossover tube. See the Efini Y-Pipe Install how-to.
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