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Old 04-11-2012, 08:51 PM   #1
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Default opinions on rx7 460cc injectors im about to install

I put together a diy Turbo thread for my 2000 nb some time ago. The stock clutch went a month ago. I ditched the Garrett t3 once it failed me. I have been running the godspeed "super 60 t3" since September and love it. Autotuned on 7 psi with MS2. Have not dynod the car yet but I feel that it is time for more boost since the flyin miata clutch is broken in. I don't think the stock injectors will handle desired boost of 12psi. But I fucked up when I piecing together my kit and bought the red top rx7 injectors that you can't tell are high or low impedance until you try them out.what can I do and anyone see a problem here?
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Old 04-11-2012, 08:54 PM   #2
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I'm running 15psi on 425cc rx8 injectors so you should be fine.
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Old 04-11-2012, 09:02 PM   #3
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As for your dilemma: Try them, if they don't work, just sell them and buy the correct ones. Rx7 injectors *are not* expensive.
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Old 04-11-2012, 09:22 PM   #4
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I run them and the work fine. 64% duty cycle at 12 psi. And you can just test the resistance between the two pins to tell if they are high or low impedance...
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Old 04-11-2012, 09:42 PM   #5
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or you can read the part number on them, rx7 injectors are documented pretty well.
I still would get newer injectors instead.
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Old 04-11-2012, 09:48 PM   #6
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I looked up the number on the injector a while ago. I just have the one set that is "either/or" so i'm kinda stuck on that. How do I test the resistance to know if they're high or low?? what numbers should I be looking for. And can I still tune with them if they are low impedance on my MS II>??? thanks for the input guys
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Old 04-11-2012, 09:51 PM   #7
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2010 at the last 4 of the injector part number?
They are high impdenance
and if you are worried just grab a mutlimeter, set it to read ohms and hit the 2 pins on the injector.
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Old 04-11-2012, 10:08 PM   #8
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http://miataturbo.wikidot.com/fuel-injectors

High Ohm/saturated direct fit Miata plug and play replacement injectors (F connector)

89-91 RX-7 NA 460cc - Red Top #195500-2010
89-91 RX-7 Turbo 550cc - purple top #195500-2020

As Cardriver and Tech both said... put a meter on them and get the resistance. If its more than about 12 Ω, you are golden.

The link above also has pics for identifying high and low ohm F connectors


Notice the connector clip tab?

RC Engineering sez:

Quote:
Do I need high or low resistance injectors for my application?

Injectors are classified into two categories.
1. High impedance/resistance (saturated) 12-16 Ohms.
2. Low impedance/resistance (peak & hold) 0.5-6 Ohms.

Saturated injectors require roughly 1-1.5 amps to open the injector. Peak & hold injectors initially needs about 4-6 amps, and once open drops to roughly 2-3 amps to keep it open.

ECU design will dictate the use of one or the other. Most late model cars will use saturated injectors.
http://www.rceng.com/faq.aspx#Do_I_n...my_application

Of course if you are dead set on buying new injectors, you can always look into a set of FiveOhMotorsports or Injector Dynamics EV14s and ditch the 1970's level injector technology
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Old 04-11-2012, 10:13 PM   #9
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Renown Performance sells FICs for less than Fiveo's injectors, and substantially better quality than Fiveo at that.

/Support a forum vendor and all that if you want to go cheap.
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Old 04-11-2012, 10:22 PM   #10
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Good call, I didn't realize Renown was selling FIC. I'd seen Reverent recommend FiveOh in the past, so that's what I bought. I was unaware there was a quality issue FiveOh??

Last edited by EO2K; 04-11-2012 at 10:33 PM. Reason: Changed ID for FIC, herpderp
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Old 04-11-2012, 10:25 PM   #11
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From what I understand, Fiveo buys the cheapest EV14 they can find, then bore it out to whatever they desire for cc-metric.

FIC buys the closest EV14 to their desired cc metric, then bores it out.

FIC's process is similar to ID's, FiveO's process is the classic fleabay injector process.

/YMMV and all though, I've only found that out via copious internet searching.
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Old 04-11-2012, 10:32 PM   #12
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Alright here are the numbers, all four have the #195500-1350 on them. But on the other side of the injector, 2 of them have a 25 with "E" on the injector clip. The other to have 26 with "F" on the clip. Still good? lol
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Old 04-11-2012, 10:33 PM   #13
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Nope, those are lo-z and not hi-z.

Well, there's a *chance* they may be 88s, but 88s were the black sheep of the RX7 family with respect to injectors.
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Old 04-11-2012, 10:37 PM   #14
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No! I'm pretty mad now. Came with pigtails too. Should I just scrap them. Or would I have a problem running these with megasquirt?
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Old 04-11-2012, 10:39 PM   #15
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Quote:
Originally Posted by sickmiatabra View Post
No! I'm pretty mad now. Came with pigtails too. Should I just scrap them. Or would I have a problem running these with megasquirt?
Frankly, I'd strongly recommend against hacking up your harness just for RX7 injectors.

I've seen fully PNP hi-z 460cc RX7s go for as low as $50 in the classifieds here.

However, if you MUST use those...

high ohm---> http://www.witchhunter.com/flowdatapix/d1955001350h.jpg

low ohm---> http://www.witchhunter.com/flowdatapix/d1955001350L.jpg

Or just freaking test them with a multimeter already and get final answers.
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Old 04-11-2012, 10:44 PM   #16
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I'll check later tonight. I don't feel like going through that hassle either. If anyone has a set of injectors for sale/ let me know. I need to upload vids of my car and this is all I'm waiting on
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Old 04-11-2012, 10:44 PM   #17
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Crap, now I'm questioning MY injectors. Thanks BALEN Now I have to pay WitchHunter $50 so I can sleep at night

But yeah, test them with a multimeter and see what's up.
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Old 04-11-2012, 10:47 PM   #18
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Quote:
Originally Posted by EO2K View Post
Crap, now I'm questioning MY injectors. Thanks BALEN Now I have to pay WitchHunter $50 so I can sleep at night

But yeah, test them with a multimeter and see what's up.
As much as I love WH (And man, do I LOVE them with all of my RX7 injectors...Seriously, I don't want to think of how much cash I've spent with them over the years), DW has a better forum-specific deal for MT.net.

/The more you know!
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Old 04-11-2012, 10:55 PM   #19
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Quote:
Originally Posted by sickmiatabra View Post
If anyone has a set of injectors for sale/ let me know.
I have a spare set of 425cc RX8 yellow injectors if you are interested. About 60k miles on them before they were pulled.
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Old 04-11-2012, 10:55 PM   #20
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Yeah, I just checked and DW is still doing their "MT Special" upgraded service. The problem is that I only want these things flowed, not cleaned. I may PM or email DW and see if they have a "flow only" service. I really don't feel like spending ANOTHER $80 on injectors I may ultimately never use.

I'm really starting to hate my build
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