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Old 07-16-2017, 05:20 AM   #1
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Injector Ohms

1982 280 zxt, Im replacing Injectors. Car is totally stock

The original ones are 3.6 Ohms 265 cc

New ones are 14.5 Ohms 330 [email protected] 43 Psi

They look the same, at least in color, My car runs around 30 psi at idle

If I did the math correctly, The cc @ 30 psi would be around 245 cc

Are these going to work,
Will the Ohms screw anything up, being higher.

Any help would be nice.
Charles
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Old 07-17-2017, 03:03 PM   #2
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Welcome to ZDriver!

Yes, technically they will work, but without any other adjustments it's going to run rich. I am running 308cc high impedance on my L28ET, but using the Z31T ecu, maf, and T3/T4 turbo. You'll probably still need to adjust the afm even running at 30psi fuel pressure.
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Old 07-18-2017, 07:35 PM   #3
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Thanks for the info, I sent them back before I installed them. Dont think the ecu would play nice with them, and Ive had just about ever problem you can have. I see your running a different ecu, guess thats why you can run high impedance injectors.

Guess I will send them off to be cleaned, tho the car runs great, it seems to stumble a little bit when starting, thinking leaking injector, plus they are original 35 years old and still clicking away. I need to install a A/F meter...next project I guess !
Again Thanks
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Old 07-19-2017, 06:37 AM   #4
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You can run high impedance injectors on a low impedance ecu, just not low impedance injectors on a high impedance ecu.

Cold start stumble would either be the air regulator, or aac.
Have you checked timing? Cold start fuel pressure (test for leak down)?
Read spark plugs?
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Old 07-20-2017, 05:32 PM   #5
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The fuel does leak down after say 30 minutes, I put a fuel check valve so the fuel could not bleed back through the fuel pump, so now it takes about 1 hour to bleed down. I was thinking it could be the fuel pressure reg, When I go to start my car, I allow the pump to get pressure up and then I start. It was around 30 when trying to start, so I installed a adjustable fuel pressure regulator, Bingo ....I set it to 37 PSI, basically WOT, seeing how At that point I have no Vac, started right up nice. But I cant seem to get the return line connection at the reg to stop leaking ( small ), but still leaking. Guess Im going to relocate it away from the rail, just so I can actually check and work on it. I like where it is now, but if you cant work and check easily what good is it. But it still leaks down. Also is there a range used for the injector impedance. Say like mine are listed in the FSM at 2.7 and they are say 3.5, is there a rule of thumb, that you need to stay within ? say 2 Ohm one way or the other.
Thanks for all the Info, helps me alot. I find this car challenging , And I guess I enjoy the challenge.
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Old 07-21-2017, 04:11 PM   #6
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So, I could not get the return fitting on the regulator to stop leaking, 30.00 piece of junk, remembered I bought a Micro Dynamics regulator of EBAY along time ago, went and dug it out of my parts stash, Installed it, Now everything seems ok, If I set it to 30 psi at idle, when I stab the throttle like WOT it goes to 43/44, So I set it down to about 27 at idle , now Im getting 38/39 at WOT, seems to idle smoothly. wish I had a A/F meter to really see what going on. Does that sound like it will work ?
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