Hi,I am planning on rebuild my s4 87 13b.Would it be better to swap to an s5 NA engine than to rebuild my s4 with s5 TII housings,and s5 na rotors?What will the advantages be for swapping to an s5 na motor?Also,where can I get premade Block off plates?And what the hell do all the abbreviations for block off plates mean?Like egr,uim,lim,etc?I checked the FAQ and it doesnt have those abbreviations.Thanks in advance!!

 

Copied out of the FAQ section

AAS = Auto Adjusting suspension
ACV = Air Control Valve
AFM = Air Flow Meter (also see MAF)
A-spec = North American Spec
ATF = Automatic transmission fluid
Auto = Automatic transmission
AWS = Accelerated Warm-Up System
BAC = Bypass Air Control
CAS = Crank Angle Sensor
CPU = Central Processing Unit (the Body computer)
DEI = Dynamic Effect Intake (found on 84 and later 13B engines)
DMM = Digital Multi-Meter (required for most electrical testing on cars)
DTSS = Dynamic tracking suspension system (found on all 2nd gen RX-7s)
ECU = Emissions Control Unit (also called Engine Control unit)
EFI = Electronic Fuel Injection
EGI = Electronic Gasoline Injection
EMS = Engine Management System (aftermarket engine computer)
FB = 1st gen RX-7 81-85 production
FC = 2nd gen RX-7 86-92 production
FC3C = 2nd gen RX-7 convertible
FC3S = 2nd gen RX-7 Coupe
FCD = Fuel Cut defender (aftermarket- used only on Turbos with modifed exhaust and stock ECU)
FD = 3rd gen RX-7
FI = Fuel Injection
FMIC = Front Mount Intercooler
GS = Sporty Model (in CAN)
GT = Sporty Model with Turbo
GT Limited = fully loaded every option turbo model.
GTU = Sporty model in 88, base model in 89-90 (in USA)
GTUs = Sporty model in 89-90 (in USA)
GX = Luxury Coupe model (in CAN)
GXL = Top line Luxury non turbo model
J-Spec = Japanese/NZ/AUS spec model
LSD = Limited Slip Differential (sometimes incorrectly called Posi or Positraction which is GM's in-house brand name for their Limited Slip Differential)
MAF = Mass Air Flow sensor
MOP = Metering Oil Pump. Oil Metering Pump as called in the service manual. (also see OMP)
NA = 1st gen Miata
NA = Normally aspirated/ Non turbo
N/A = Normally aspirated/ Non turbo
NB = 2nd gen Miata
OE = Original Equipment
OEM = Original Equipment Manufacture
OMP = Oil Metering pump
PD = Pulsation Dampener
PS = Power steering
PW = Power windows
SA = 1st gen RX-7 79-80 production
Savanna = The name the 1st and 2nd gen RX-7 was sold under in Japan.
SE = Base model in the USA in 87.5-88
Series 1 / S1 = 1979-1980 RX-7 models
Series 2 / S2 = 1981-1983 RX-7 models
Series 3 / S3 = 1984-1985 RX-7 models
Series 4 / S4 = 1986-1988 RX-7 models
Series 5 / S5 = 1989-1992 RX-7 models
Series 6 / S6 = 1992-1995 RX-7 models
Sport = 86-87 Sporty model (in USA also see GS)
TB = Throttle Body
TBM = Throttle body modification
TID = Turbo Intake Duct
TMIC = Top Mount InterCooler (factory style)
TPS = Throttle position sensor
TII = Turbo model
T2 = Turbo model
VDI = Variable Dynamic Intake
WOT = Wide Open Throttle
6PI = 6 Port Induction the auxiliary ports, or the not so correct term - 5th/6th ports
13B = Normally aspirated/ Non turbo, 2 rotor, rotary engine.
13BT = Turbo charged, 2 rotor, rotary engine
13B-RE = J-spec Cosmo twin turbo, 2 rotor, rotary engine.
13B-REW = FD twin turbo, 2 rotor, rotary engine.
20B = J-spec Cosmo three rotor, rotary engine.

 

Where are the abbreviations i was looking for?

 

Cross-series swaps are a major pain in the butt. Stick with your S4 stuff.

Any vendor (ie. Mazdatrix). Or just make them yourself.

EGR = Exhaust Gas Recirculation
UIM = Upper Intake Manifold
LIM = Lower Intake Manifold

 

Alright thanks alot!Is it worth porting the intake and exhaust ports or is there not enough meat in the ports to gain enough horsepower??