Do I Need New Injectors???
TECH Regular
Joined: Feb 2003
Posts: 444
Likes: 1
From: Bahrain
Originally Posted by Red97Z
With the mods in my sig should i go with bigger injectors? or are the stock ones adequate. are their advantages/gains? thanks
I have heard the stock injectors are good to about 400 hp but i dont know what duty cycle that is at. like mentioned it should be around 80-85%. a crude way of estimating is that an injector should be able to support at least double the number of pounds in horsepower per cylinder. ie 28# x 2 = 56 hp/cylinder. these are crank power numbers. advantages of a larger injector, assuming you need it, would be not leaning out, added insurance and more growing room for fuel hungry mods.
RPMs comes into play with injector selection as the higher the rpm the less time the injector has to injecet sufficient fuel. That said METALBEAST is not the first to need larger injectors with the HOT cam and heads some guys need them with just the cam.
I am finding that even with my smaller cam and stock heads I am begining to tax the stock injectors and power is falling off towards the topend. I at first thought it was the pump but injector duty cycles are going over 90% with spikes beyond 100%.
I am finding that even with my smaller cam and stock heads I am begining to tax the stock injectors and power is falling off towards the topend. I at first thought it was the pump but injector duty cycles are going over 90% with spikes beyond 100%.
