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Old 08-21-2006, 04:56 PM   #1
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Default MS and injector formats (low/high impedance)

Is there a preferred injector format to use with the MS systems?

ie: Low impedance vs high impedance?

I'm planning full ecu replacement... and was looking at a set of 550 RX7 injectors (direct miata injector replacement). I can scale for this size injector without issue also right?

Thanks,
Dave
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Old 08-21-2006, 05:14 PM   #2
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I would get RX7 550s. perfect for ms miata. I had interference problems using my low impedance DSM injectors without resistors. Natesully has also had this problem.

Its a standalone, so yes, it will idle much larger injectors than 550s.
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Old 08-21-2006, 05:18 PM   #3
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Quote:
Originally Posted by Al Hounos View Post
I would get RX7 550s. perfect for ms miata. I had interference problems using my low impedance DSM injectors without resistors. Natesully has also had this problem.

Its a standalone, so yes, it will idle much larger injectors than 550s.
I had noticed your issues using DSM(my usual injectors of choice) and sorta saw resolution with it... but no real answer. I'll go the rx7 route.

I figured I wouldn't have issues with 550... but figured i'd piggyback that on the real question
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Old 09-08-2006, 01:00 PM   #4
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since there's already a thread for this, might as well semi-hijack and add a bit more meat to it. I'm currently hunting for the ever-popular 460/550 rx7 injectors that are direct drop ins, but which other ones are going to be direct fits at the head/rail, but just ened new connectors to be soldered in?

will the 195500-1350's with the red tops (the high inp version of the 1350's) slide into the head and fuel rail without issue, requiring only new square connectors? I imagine that attempting the low imp version would lead to a similar issue as the issues you had wite the dsm injectors, however.
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Old 09-09-2006, 07:33 PM   #5
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The plug might be diffrent but those injectors work very well.
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Old 12-10-2006, 01:55 PM   #6
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Just to make sure, the 550s will be fine with stock fuel pressure on a '99 1.8 when running MS? What HP ceiling would someone see with 550s?
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Old 12-10-2006, 02:05 PM   #7
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*IF* you can sustain 60psi fuel pressure into boost, you're good for 300whp at 80% dc. If you start at 60 psi but drop into the upper 40s-50psi (like what I keep reading) you still have enough fuel for 260-270 at the wheels.
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Old 12-10-2006, 02:10 PM   #8
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Glad to hear, thanks Ben appreciate the help, thought you might chime in.
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Old 12-10-2006, 02:47 PM   #9
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I have the 430cc Supra injectors (low impedence) but have the JGS Tools resistors put in line. Works great for me!
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Old 12-11-2006, 08:56 PM   #10
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Quote:
Originally Posted by devin mac View Post
will the 195500-1350's with the red tops (the high inp version of the 1350's) slide into the head and fuel rail without issue, requiring only new square connectors? I imagine that attempting the low imp version would lead to a similar issue as the issues you had wite the dsm injectors, however.
Yes, they work great. Double check the square connector, as some of them have the "tang" on the side of the connector located in different spots.
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