LTX and LSX Putting LT1s, LS1s, and their variants into Third Gens is becoming more popular. This board is for those who are doing and have done the swaps so they can discuss all of their technical aspects including repairs, swap info, and performance upgrades.

Injector size calculations

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06-12-2018, 03:39 PM

#51

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Car: 92 Firebird, 77 Trans Am SE, 86 Z28

Engine: 5.7 HSR, T/A 6.6, empty

Transmission: T-5, TH350, T-5

Axle/Gears: 3.08 posi, 3.23 posi, 3.23

Re: Injector size calculations

Quote:

Originally Posted by 5Camaros

What would the original pressure rating for the fuel injectors on a stock 1991 Z28 5.0L
I have to replace the injectors - being told they should be around 44psi

Correct. 40-44 psi with the key on and the engine not running is roughly where you want to be. If you're using injectors rated the same as the originals (19# @43.5psi), not changing the regulator and the pump is good then you'll see that number.

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350, 408ci, 450, fuel, gen, horsepower, hp, injector, injectors, lbs, lq4, ls3, needed, psi, run, size

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