Running injectors at lower than rated pressure?

Specifications, applications, part numbers, and prices for various OEM fuel injection components.

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Running injectors at lower than rated pressure?

Postby Lambo » Sat Feb 10, 2018 9:26 am

I have 4 FAST injectors in a TBI unit rated at 85pph at 58 psi. I don't need near that much injector (50pph would have got it done).

I was curious if I could run these at a lower rate (like say 43psi) to both lower the output of the injector, and reduce stress on my fuel pump.

It probably isn't necessary that I do this, but I was curious if there would be any detrimental effects on the operation of the injectors? I know injectors get run at higher than rated pressures, but at a lower than advertised rate would it still atomize fuel properly?
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Re: Running injectors at lower than rated pressure?

Postby Lambo » Mon Feb 12, 2018 7:13 pm

I suppose maybe it doesn't apply there, but i got my answer via the FB owners club, and also FAST tech support got back to me.

The simple answer is, yes, they'll work just fine, calculating out to 75pph at 43psi (the tested flow rate is 87pph at 58psi)
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Re: Running injectors at lower than rated pressure?

Postby Paul_VR6 » Tue Feb 13, 2018 5:12 am

On port injectors I wouldn’t think twice but the high pressure on a tbi unit is used for the necessary atomization.
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Re: Running injectors at lower than rated pressure?

Postby Lambo » Tue Feb 13, 2018 3:05 pm

That's interesting... I'd have assumed that better atomization would have been of greater importance in port injection???
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Re: Running injectors at lower than rated pressure?

Postby Paul_VR6 » Tue Feb 13, 2018 6:24 pm

Nope, it has the hot intake valve to smack against and a lot more velocity with port inj.
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