1.6L turbo Mazda MX5 1993 S-Spec Roadster
Most recent, showing dual feed water injection system:
Specifications & Performance Modifications
1993 S-Special Eunos Roadster
Engine management system
E-Manage Ultimate (EMU) w/remote datalogging, autotune enabled & factory airflow meter (AFM) removed.
Tuned to 17 psi, as a daily driver its running circa 15 psi
Innovate LC-1 wideband O2
DIY O2 clamp, manually controlled by the EMU auxiliary output map.
Fuel system
Custom dual-feed fuel rail
Flow tested RX-7 red top 460cc injectors
Jackson Racing 190 l/hr Walbro fuel pump
Engine hardware
Mistubishi TDO4H-15G turbo
Ally-welded sump oil return
Accu-boost mechanical boost controller
Greddy 4 bar MAP sensor
Turbo heatshield
Pipercross high-flow induction filter
2.5" FM intercooler & aluminium radiator upgrade
Custom 2.5" silicone hoses
Bailey DV36 twin-piston BOV w/trumpet
Magnecor sport leads
NGK BKR7E-11 plugs
Pipercross crankcase breather filter
2.5" ceramic-coated Racing Mazda downpipe
ETD turbo manifold
Silicone water hoses
2.5" stainless steel turbo exhaust (de-cat'd)
Custom designed/built/installed water injection system utilising twin nozzle injection, a high speed valve (HSV) controlled by the sub-injector map in the engine management unit (e-manage ultimate). Additional EMU maps control the O2 clamp, water injection pump & as mentioned - the HSV.
Transmission
Fidanza 8 lb aluminium hybrid flywheel (10 lbs lighter than factory flywheel)
ACT Extreme clutch
Type 1 1.8 Torsen differential
Suspension, wheels & brakes
All round 1.8 brake upgrade & grooved discs/track pads
Adjustable Kayaba AGX shocks
15" TSW lightweight alloys, 195/50/15R
E-tech front strut brace
Diagnostics
Link passive knock display
Innovate LC-1 wideband O2
Autometer boost & air fuel ratio gauges
Exterior
Reinforced style bar
Mohair hood
Stainless steel racing grille
Lexus style rear lights
Purple LED chrome washerjets
Chrome projector blue fog lamps
Chome fuel lid
Stainless steel windscreen wipers
Aftermarket front & rear bumper/w mesh
Misc
Power assisted steering, airconditioning, electric windows & cat II alarm/immobiliser.
Dyno Results
Dyno'd at 243 bhp, running 15 psi boost.
..then fitted & tuned a custom DIY water injection system and ran 16 psi to yield 259.7 bhp :
