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Installing RX7 680 cc injectors
I've noticed there's a lot of talk about these injectors, but not a whole lot of solid info on them. Lucky for me, my dad has 4 of these old RX7's that have the larger injectors. They're only found on the first generation 84-85 GSL-SE models with the 13b engine. They will have the orange tops if they are the 680's. The impedance is the same so you don't need to add a resistor pack or do anything with that. I pulled off 6 of them off of non running cars and sent them to Cruzin' Performance to be cleaned. They charge about $14 per injector and replace anything that needs it. Awesome communication and shipping also.
The print out shows that they actually flowed 780-800 cc/min at 43.5 psi, which makes them even bigger than I expected. But this was ok since I have DSMLink, but could be a problem for SAFC users.
I compared the stock injectors side by side with the "680's" and they seemed identical besides the cap on the 680's is a little longer. They still fit right into the fuel rail and the head just fine though. No modding is necessary to make them fit besides tuning for them. After I dialed them in using DSMLink, my settings were -40 global and 0 deadtime. This is off a bit since my AFPR broke and I'm running the stock one for now. It is pretty rich at idle but the fuel trims are inline and only the lowest airflow slider is moved down to -1%.
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