RX7 TURBO 2, 550 cc Injectors (high) and stock computer - Miata Turbo Forum - Boost cars, acquire cats.

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Old 10-03-2011, 08:24 PM   #1
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Default RX7 TURBO 2, 550 cc Injectors (high) and stock computer

Like to know if you can run the 550cc Injectors High (from a turbo 2 RX7)with the stock 1993 Miata Computer, or I need a stand alone computer? Currently, I am using a 84-86 RX7 mass Air meter with the 320cc Supra Injectors an additional 5 injector in the intake, that work with a presure switch. Also the car already have some kind of instrument that retard the ingnition while getting boost. I am running 6 psi right now, and the car run exellent. I just put a new ball bearing turbo and I would like to run 12 psi. Let me know if I can use the 550cc injectors with stock computer. thanks
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Old 10-03-2011, 09:30 PM   #2
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Highly doubt it. I tried running 460cc on my '92 stock computer with a 255LPH fuel pump and it would run for about a minute before loading up with fuel, fouling the plugs and dying out. 315cc was the biggest I could run without problems.

Even if you managed to somehow get it started, your fueling would be inconsistent throughout the rpm range. Your better off going with a programmable ECU if your going to run the 550s.
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Old 10-03-2011, 09:44 PM   #3
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If you could do something like that, you wouldn't have a large chunk of this board dedicated to aftermarket ECU's.
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Old 10-04-2011, 01:55 AM   #4
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Anyway, I will keep the injectors until I get a new ECU. Thanks
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