2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

rc 750cc injectors

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Old Jul 28, 2012 | 12:05 PM
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rc 750cc injectors

I don't know much about fuel injection, but does anyone know if rc 750 injectors will fit in stock t2 fuel rails?
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Old Jul 28, 2012 | 12:33 PM
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13B specific... Yes.

What do you plan to control them with?
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Old Jul 28, 2012 | 12:36 PM
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Well, they're out of a dodge srt-4. Is there actually a difference?
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Old Jul 28, 2012 | 01:12 PM
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Originally Posted by chunkamunka1
Well, they're out of a dodge srt-4. Is there actually a difference?
Physically? there is a 200cc difference.

However the Srt-4 fuel system is rated at 58psi versus our 40something-psi since it isn't exactly 3 bar. The increase in fuel system pressure increases the flow rate, so the 750's could really be like 650's in our cars.

What are you using to control them? You can't slap on fuel injectors to the factory ecu and expect lots of good results.
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Old Jul 28, 2012 | 01:13 PM
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There may be a difference in length of the injector, width of the inlet end, and pintle head.

The most obvious would be the injector clips. They're most likely different.
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Old Jul 28, 2012 | 01:15 PM
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rtek 1.7's in the mail right now. I was looking at there website and the tops are different i think.

The ones forsale are "Bosch style" and i think i need "denso style".
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Old Jul 28, 2012 | 01:16 PM
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oh, the clips are the same. But the Top of them, where it fits into the fuel rail looks a bit different.
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Old Jul 28, 2012 | 01:36 PM
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Originally Posted by chunkamunka1
Well, they're out of a dodge srt-4. Is there actually a difference?
There are several different types of fuel injectors. The four main characteristics are as follows:
1) Feed method
WitchHunter Performance - Fuel Injector Types
2) Body style
WitchHunter Performance - Injector Cleaning & Flow Testing Services
3) Connector type
WitchHunter Performance - Fuel injector connector types
4) Impedance
WitchHunter Performance - Fuel Injector Types

In order to work with the stock fuel rails and electrical connectors, you need top-feed Denso style fuel injectors. The impedance type depends on whether your car has a resistor pack, and the exact plug type may vary.
2ndGen Injector Types

In order to correctly run larger fuel injectors, you must have an aftermarket fuel controller that is tuned for them. Note that different aftermarket fuel controllers may require a different impedance fuel injector than what your car currently has installed, so I suggest that you buy the fuel controller prior to buying any fuel injectors. If you install larger fuel injectors without a tuned aftermarket fuel controller then your engine will bog, produce less power, and get horrible gas mileage.

The pre-tuned Rtek upgrade chip is a popular choice.
Rtek7 ECU Upgrade Detailed Information

The next step up is a piggyback fuel controller like the Apexi AFC, which requires a moderate amount of tuning. AFChttp://www.banzai-racing.com/store/fuel_controllers.html

A standalone EMS offers the most potential, but it requres the most work to set up. The most popular brands are Haltech, Microtech, and Apexi. You can see other options in our EMS subforum. I recommend getting one that has local support from a good professional tuner.
Haltech ECUs
Apexi P-FC for the 2Gen RX-7
Microtech ECU's
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Old Jul 28, 2012 | 02:19 PM
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PLh-750D fit.
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