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Discussion Starter · #1 ·
Hey everyone,

Because I´m upgrading the fuel system on the escort I need to know what "kind" of injector we have. Im pretty sure its a 230 or 250cc injector. But, I dont know if its low or high impedance.

Likewise, what year RX7 is our fuel pump comptable with. aka. What year RX7 can a snag a fuel pump from?
 

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Discussion Starter · #3 ·
Hey Denis,
So I´m guessing I need a high impedance larger injector?

The 460´s in the non-turbo RX7, are they high or low? I know the 550cc are high impedance now, but do they require modification to get them in ?

thanx
 

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Go read up on Randy´s site, http://www.solomiata.com He has a lot of info on the BP motors and other mazda 4cyl motors. I believe the answers to lots of your questions will be there

Injectors:

The Miata uses high ohm injectors (saturated type, 12-16 ohms) and has a fairly unique rounded injector connector. The 205cc 1.6 injectors can be directly replaced with the 94-97 230cc 1.8 units. Many other makes injectors are also a direct fit, including the late 87-89 Toyota injector from the normally aspirated MR2 (4AGE) 1.6 DOHC at 213cc (Beige top), 89-91 B2200 truck at 224cc, 89.5-92 Toyota Supra non turbo at 305cc (light green top) and turbo 430cc (black top), 89-91 B2600 truck at 326cc and the 89-92 Mazda RX-7 non turbo at 440cc. Most OEM injectors of ealier vintage or larger capacilty either have a different shaped connector requiring swapping the pins to the Miata connector or soldering a new connector on. Examples of this are the 88-89 323 GTX/91-95 Capri Xr2/88-92 MX6 2.2 turbo 300cc injectors. Many larger aftermarket and some OEM injectors like the 86-88 RX-7 440cc are of the low ohm variety (Peak and Hold type, 2-6 ohms) which requires a balast resister in line to work with the factory ECU injector drivers. FYI, if you are running at 150 rwhp or over then the factory 94-97 1.8 230cc injectors are at full duty cycle.

_________________
´89 Mazda MX-6, 356 wtq
´93 EGT, 55 shot N2O

[ Edited by MXTurbo On Date 08-06-2002 ]
 

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The factory ECU can´t handle anything larger then 270cc/min and maintain a good idle. After that you need a fuel controller.
Denis
 
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