Would I need a tune?
Would I need a tune? I got a 93 lt1 formula I was wondering if I put 36 lb injectors in if I would need a new tune? I have a dyno tune on it now and I gotta be maxing out the 21 lb injectors that are in it now thanks guys!
Staging Lane
Joined: Dec 2011
Posts: 56
Likes: 2
From: Berlin, CT
Injectors are made up of a small hole with a tapered pin in the hole (which seals it), and a solenoid at the back side of the pin which pulls it out of the hole, allowing fuel to spray through the hole. The amount of fuel sprayed through the hole is determined by the duration (length of time) that the pin is pulled back, and the pressure at the orifice, which is fuel rail pressure.
The ECM controls the pin, and the fuel pressure regulator controls the rail pressure. Both of these have not (yet) changed; BUT the 34 pound injectors have a larger orifice and a larger pin.
So, the duration is still the same, the pressure is still the same, but the hole is larger - your car will run rich until you change the duration of the injector (called the "pulse width") with a tuner.
The ECM controls the pin, and the fuel pressure regulator controls the rail pressure. Both of these have not (yet) changed; BUT the 34 pound injectors have a larger orifice and a larger pin.
So, the duration is still the same, the pressure is still the same, but the hole is larger - your car will run rich until you change the duration of the injector (called the "pulse width") with a tuner.
