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rc sl4-550 injectors on 91 nsx
- Thread starter doc_tai
- Start date
Best way would be to get the oem plug from auto wrecker (or me) and solder all the wires together , then just plug it in , this will avoid cutting any of your car's wires and you can go back to stock in a snap! I could even send you the plug ready to go!
Or, you can buy the right injectors
i thought I did, I just bought these injectors from titaniumdave. I ask him " Do they work on 91 nsx" and he said "yes". Then when I got them, they"re saturated not peak and hold. I once again ask him" Are you sure they gonna work my 91 nsx which has a resistor box?" and he said "I had not problem with my 91, controlled with an AEM ECU. An AEM FIC should support them too!". I should just run stock vr4 or dsm injectors if I don't wanna spend money
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Well doc since you are trying to save money , you could run some other injectors like you mention , but it is a pretty critical component. Just get the correct parts , there is nothing wrong with running the high impedance ones you already have , just bypass the box with a plug , if you are getting other parts from me , I will just send you one free.
I know that's why I bought this injectors. He has 91 too so I thought they're peak and hold without asking. Thanks for offering me more free stuff
The injectors will work fine, just connect the 2 wires together.
Ya, I think you're looking at the wrong part
You can basically, just reverse the process listed here:
http://www.c-speedracing.com/howto/resistorboxwiring/resistor_box_wiring.php
IMO, why not sell the ones you got, and buy a set low-impredance injectors? They cost the same. Or, if you're making less than 400whp-ish, just run a set of DMS 450cc injectors... plug and play and they are low-impedance. You can get a set for under $100. (set of 6 though.. not 4
)But ya, you don't want to use high impedance injectors WITH a resistor box. You will be hindering the injector driver performance and solenoid response time.
NO! If you are trying to use High Imp. injectors, you need to bypass the INJECTOR RESISTOR BOX... not the fuel pump dual stage resistor box!
I *am* a tuner and very familiar with the AEM (all other systems). The injectors fire, but it is certainly not ideal. The impedance per driver is far too high (ohms).
A high impedance driver has an internal resistance of 12.5ohms. A low impedance driver is around 2.5ohms.
The idea of the resistor box is to bring the resistance of a low-imp. driver to 12.5-14.0ohms.
So basically, you are running a driver already at 12.5ohms, and then increasing the resistance (lowering the voltage) with the resistor box.
The high impedance driver will not have enough current to "slam" open fast enough (response time), and dwell voltage to maintain the open time (duty cycle). The high-imp injector is designed to work on a single voltage value for "open" and "dwell".
A low-imp. injector is called "peak and hold" because, it uses a higher voltage (peak voltage) to "slam open" the solenoid (response time), then a lower voltage to keep the solenoid open during the dwell (hold) time.
Again, although it "may" have worked, it is certainly NOT the way to do it.
The AEM EMS will not "bypass" the resistor box in any way, not does it have a "setting" to use a resistor box with high-impedance injectors.
It (resistor box) *must* be removed if you're using high-imp injectors.
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if I cant sell these injectors by the time I'm ready to install turbo, I'm just gonna use them but I'll bypass the resister box. I have a punch d and b series wire harness, I'm pretty I can find the right 8 pins plug for it. Thanks
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Those injectors will work if you listen to what we are telling you to do. If you want to sell them, that is cool also.
I know but if I can sell them, I just buy right injectors for it. Maybe 650cc
Yes , the plug you need is on the ditributor on OBD1 D or B series
so this is the resistor box that has to be removed?and what wires do i have to bypass?
no this is the resistor box to need to remove and bypass. All you have to do is connect all the wires together.
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You got the plug , right?
daves inj will work fine with the ems you are using as it has built in support for peak hold standard on a 91 or the larger 550 sats, you adjust your duty cycle to correct a/f on the ems on the originals I thing you can check them for 2.5 volts p/h if I am lost about the correct voltage remind me whats correct for the 240cc 91 injectors later they went to 270ish sat inj for the 3.2 again its been awhile working on a c30
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