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Old 05-29-2009, 07:22 AM
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Injector Impedance

Ok I have a 91 Trans Am with the tpi. I built a new engine for it and I need 40lbs injectors but the only ones I found are ones with a 12 ohm impedance injectors that say they are for a lt1 ECU but I know that my stock 19 lbs injectors have a 14.4 ohm impedance.

So what I am asking is can I go with the 40 lbs 12 ohm impedance injectors or do I need to stick with a 14.4 ohm impedance injector?
Will it hurt my ECU to go with the 12 ohm impedance injectors?

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Old 05-29-2009, 08:33 AM
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Quote:
Originally Posted by YB2fast
Will it hurt my ECU to go with the 12 ohm impedance injectors?
This doesn't answer your question, but generally speaking, a 12-16 ohm injector is considered "high impedance". Low impedance injectors are generally below 3 ohms.

From this, I would hazard a WAG that you'd be OK- but hopefully OB or someone else with a better understanding of EFI will chime in.
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Old 05-29-2009, 10:49 AM
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Yeah I knew that about the high and low impedance. But yeah I was thinking the same thing I'm just not sure if that 2.4 ohms would be a big difference.
Thanks though.
Anyone else got any thoughts
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Old 05-29-2009, 06:18 PM
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Bump Bump Bump
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Old 05-29-2009, 08:10 PM
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Those injectors are Multecs, they are all going bad. You will need new ones. Not because of the impedance, because those injectors tend to go bad. The E85 is killing those injectors. The E85 has alcohol. The inside of those injectors are steel, the alcohol evaporates and the water stays behind and rusts out the inside.

The best remedy is to replace them with newer style injectors that have stainless steel insides that will tolerate the E85.

You can look at my profile for a link to my company. I happen to own an injector company. We rebuild, customize, and do new ones.

Those were 22 LB injectors stock. Nothing fancy. Sent PM, let me know what I can do to help. Call anytime, I forward to my cell.

Last edited by Jsup; 05-29-2009 at 08:29 PM.
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Old 05-29-2009, 08:27 PM
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Quote:
Originally Posted by Jsup
Those injectors are Multecs, they are all going bad. *snip* Those were 22 LB injectors stock. Nothing fancy.
The question is:

"can I go with the 40 lbs 12 ohm impedance injectors or do I need to stick with a 14.4 ohm impedance injector?
Will it hurt my ECU to go with the 12 ohm impedance injectors?"
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Old 05-29-2009, 08:33 PM
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Quote:
Originally Posted by cobalt327
The question is:

"can I go with the 40 lbs 12 ohm impedance injectors or do I need to stick with a 14.4 ohm impedance injector?
Will it hurt my ECU to go with the 12 ohm impedance injectors?"
Sorry, it's late and I was on the phone with carsavvycook. We were talking and I missed the question. So many multecs going bad just jumped to conclusions. I'm off the phone and semi lucid now. I don't multitask well.

OK, 40LB injectors are high impedance and will work fine with the stock ECU or with any aftermarket ECU. 12-16 ohms is fine.

My last post still stands. Make sure the injectors you're looking at are E85 compliant so you're not spending money again in a year or two.
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Old 05-29-2009, 09:08 PM
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Good info for my notes- as well as helping the OP- Thanks!
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Old 05-30-2009, 05:50 AM
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Originally Posted by cobalt327
Good info for my notes- as well as helping the OP- Thanks!
Glad I paid attention this time!
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Old 05-31-2009, 10:41 AM
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Thanks a lot guys I really appreciate it.
David
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