Originally Posted by db84drteg
I know they'll plug into the wiring harness without an issue. My question is if the nozzle will fit into the miata head without having to get new hardware.
3 Fuel injectors
The 1.6L (203cc) fuel injectors have enough room to run about 5-6psi. However at this level, the fuel pressure required to get enough fuel into the motor through the small injectors becomes so great, that the injectors can actually lock. If you are running more than 140-150rwhp, chances are the injectors are maxed out. A very common upgrade is to install the 1.8L injectors. These will should provide you enough room to run about 7-9psi of boost (170-180rwhp).
94-97 (tan) 265cc - #195500-2180
99-00 (red) 240cc (pass on these) -#195500-4430
01-05 (Lt. purple) 265cc -#195500-4060
Ideally you want to be able to run larger injectors at a lower fuel pressure, however, without additional fuel management this is not possible. The stock ECU has some wiggle room to run a larger injector, it usually requires tuning with the AFM to idle. A few people use the larger RX-7 AFM (B series) and 305cc injectors on the OEM ECU. The 1.6 ECU should be able to idle up to 330cc injectors. However it will require tweaking the AFM idle-mixture settings and spring tension, sorry MAFers.
If you are using a piggyback fuel management unit such as the E-manage, the popular injector to use is a 305cc injector from the Supra. If you are using a replacement ECU the popular choice are RC 550cc injectors.
The Miata uses high ohm injectors. Also know as saturated injectors.
Complete list of Miata plug and play replacement injectors (F connector):
Year Make/Model Engine Size/Color Part #
87-88 Toyota MR2 4AGE NA 213cc Beige Top #23250-16080
89-91 B2220 Truck 224cc - Yellow Top? #23250-74040?
99-00 Mazda Miata 240cc - Thin Red Body #195500-4430
Toyota 4AGE 250cc Green Top
Toyota 4AGE 250cc Violet Top
94-97 Mazda Miata 254cc - Tan Top #195500-2180
01-05 Mazda Miata NA & TURBO 265cc - Thin Lt. Prple #195500-4060
Toyota 3SGE 295cc Green Top
89-92 Toyota Supra 7MGE NA 305cc Light Green Top #23250-70080
93-95 Toyota Supra 3.0L 312cc - Maroon Top #23250-46030
Toyota 3SGE 315cc Pink Top
90-92 MX6/626/Probe Turbo 326cc - Gray Top #195500-2150
89-91 B2600 Truck 326cc - Gray Top #195500-2150
Mazda 323 GTX TURBO 360cc - Black Top #195500-2130
Celica/MR2 3SGE NA 370cc - Green Top #23250-74160
Mazda RX8 420cc - Yellow Body #195500-4450
Subaru WRX 425cc - Lt. Blue Body #3920
89-92 Toyota Supra 7MGE TURBO 430cc Black Top
89-92 Mazda RX-7 NA 440cc - Blue Top #195500-5740
89-91 RX-7 NA 460cc - Red Top #195500-2010
Subaru STi 540cc - Thin Pink Body #3910
89-91 RX-7 TURBO 550cc - purple top #195500-2020The same connector shape can be found on low ohm injectors, but they require wiring in resistors to increase the resistance and filing down the tabs on the sides of the injectors.
Direct fit LOW OHM injectors (E connector):
89-92 Toyota Supra (7MGE) NA - (295cc Yellow Top) - #23250-70040
88-91 Toyota Collora GT-S Turbo (4AGZE) (365cc Red-Orange Top)
92-95 Toyota Collora GT-S TURBO (4AGZE) (365cc Red-Orange Top)
86-92 Toyota Supra (7MGTE) TURBO (430cc Black Top)
Toyota MR2 (3SGTE) TURBO (430cc Black Top)