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Has any one tried the Optimum EFI® – TBI Throttle Body Injection

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Has any one tried the Optimum EFI® – TBI Throttle Body Injection

Old 01-02-2019, 10:36 PM
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Has any one tried the Optimum EFI® – TBI Throttle Body Injection


I found this on Ebay and was wondering if anyone has any info on this

Last edited by Marks90rsz28; 01-02-2019 at 10:42 PM.
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Old 01-03-2019, 08:08 AM
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Re: Has any one tried the Optimum EFI® – TBI Throttle Body Injection

Looks like a modified GM TBI setup, it's only a 2 barrel, why would you want to use that?
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Old 01-03-2019, 12:01 PM
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Re: Has any one tried the Optimum EFI® – TBI Throttle Body Injection

I don’t think a tbi injector driver would even handle the two high resistance injectors.
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Old 01-03-2019, 10:52 PM
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Re: Has any one tried the Optimum EFI® – TBI Throttle Body Injection

That's what I was wondering. I like the idea of using modern injectors but wasn't sure if the computer could handle them. I'm thinking of switching to the dynamic efi computer and that's why I was looking at this to see if they were compatible
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Old 01-03-2019, 10:57 PM
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Re: Has any one tried the Optimum EFI® – TBI Throttle Body Injection

And I'm fine using the 2 bbl for now because I currently have a 305 in as 90 rs and I'm trying to get 300hp out of it. And for the record the only reason I'm staying with the 305 is I love telling people I beat them with that boat anchor. I'm also gathering part for my future gen 4 iron block 6.0 ls build for the car
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Old 01-04-2019, 10:55 AM
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Re: Has any one tried the Optimum EFI® – TBI Throttle Body Injection

A TBI ECM injector driver can easily drive a high impedance injector (12 ohm+). Figure that instead of a 4A drive current, it is about 1A of current.

If the injectors happen to be low impedance port injectors (2.2 - 2.4 ohms). Will need to wire the two of them in parallel on one driver.

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Old 01-04-2019, 08:47 PM
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Re: Has any one tried the Optimum EFI® – TBI Throttle Body Injection

Originally Posted by RBob View Post
If the injectors happen to be low impedance port injectors (2.2 - 2.4 ohms). Will need to wire the two of them in parallel on one driver.

RBob.
That would make the resistance even lower, wouldn't you mean wire them in series?
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Old 01-04-2019, 09:22 PM
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Re: Has any one tried the Optimum EFI® – TBI Throttle Body Injection

I mean, these would offer a wider range of injector choices, I guess.

But if are upgrading a TBI engine, you'll have to have a better fuel pump. With an adjustable regulator, you'll be able to get all the flow you'll need from 5.7L injectors, and tweak it as needed with the turn of a ****. So I'm not really seeing an advantage.

They don't appear to my very amateur eye to offer a lot more air flow potential (slimmer profile).
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Old 01-04-2019, 09:42 PM
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Re: Has any one tried the Optimum EFI® – TBI Throttle Body Injection

I'm currently running a tpi fuel pump so I have enough pressure for my nitrous system so I'm not to worried about fuel pressure.
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Old 01-05-2019, 01:26 PM
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Re: Has any one tried the Optimum EFI® – TBI Throttle Body Injection

Originally Posted by scooter View Post
That would make the resistance even lower, wouldn't you mean wire them in series?
Wired in parallel. A TBI injector is 1.2 ohms.

Wiring injectors in series is bad form. It halves the voltage to each of the two injectors.

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Old 01-05-2019, 05:27 PM
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Re: Has any one tried the Optimum EFI® – TBI Throttle Body Injection

Thanks for the information
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Old 01-07-2019, 11:51 AM
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Re: Has any one tried the Optimum EFI® – TBI Throttle Body Injection

Originally Posted by RBob View Post
Wiring injectors in series is bad form. It halves the voltage to each of the two injectors.

RBob.
Oh yeah, ok, I wasn't thinking about that but why would you want to lower the resistance to the driver? I thought that was a bad thing on the factory ecm?
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Old 01-07-2019, 04:57 PM
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Re: Has any one tried the Optimum EFI® – TBI Throttle Body Injection

The TBI ECM injector drivers are a peak-and-hold (PnH) type. Once the injector current hits 4 amps the driver folds back to a 1 amp holding current.

So going to 2.2 - 2.4 ohm injectors is no big deal. The stock TBI injectors are lower at 1.2 ohms.

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