Fuel Injectors
01-05-2007, 11:09 AM
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Fuel Injectors
How many CC is the factory 350z fuel injectors? and if I am installing the injen ses exhaust system, JWT popcharger and dc headers is it wise to install bigger injectors? if so how big?
01-05-2007, 12:06 PM
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Stock injectors should suffice until you start getting into the 400+rwhp range. Even then depends on what you want to do with the car.
For anything 600rwhp+ you will be better off with 750cc injectors or larger depending on what kinda HP you want to put down.
But for the mods listed, youre covered for a while until you go turbo. At that point you may want to look into an entire new fuel system, injectors, lines and fuel rail
For anything 600rwhp+ you will be better off with 750cc injectors or larger depending on what kinda HP you want to put down.
But for the mods listed, youre covered for a while until you go turbo. At that point you may want to look into an entire new fuel system, injectors, lines and fuel rail
01-05-2007, 08:34 PM
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Originally Posted by J~KiLLa
How many CC is the factory 350z fuel injectors? and if I am installing the injen ses exhaust system, JWT popcharger and dc headers is it wise to install bigger injectors? if so how big?
G
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01-06-2007, 05:15 AM
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Idle rpms are the most difficult range for injectors because of the dynamic range from 6 HP at idle to 300HP a 50:1 ratio.
If you study the injectors you see that at idle they close before being even fully open just a 1/2 drop of fuel escapes into the air stream.
It takes 1.0-1.5 milliseconds of open time for the injector stream to achieve the ideal cone shape..........this depends on the temperature and viscosity/density of the fuel purchased [every batch varies a small or large amount]........depends on refinery.
Why the pressure and fuel temperature is measured in the tank.......unfortunately no inexpensive [non lab/passsive] way to measure density. Why Wide band O2 attempts to trim idle injection time.
Playing with injectors requires some engineering experise to get it right....plus lots and lots and lots of testing and tweeking.
When you increase injector size nearly impossible to achieve a smooth low rpm idle because that 1/2 drop is 2-3 times larger [in volume] and needs 1000-1500 rpm [2-3 times more air for combustion] to be correct.
The greatest engineering challenge in performance engine design is the smooth low rpm idle.
If you study the injectors you see that at idle they close before being even fully open just a 1/2 drop of fuel escapes into the air stream.
It takes 1.0-1.5 milliseconds of open time for the injector stream to achieve the ideal cone shape..........this depends on the temperature and viscosity/density of the fuel purchased [every batch varies a small or large amount]........depends on refinery.
Why the pressure and fuel temperature is measured in the tank.......unfortunately no inexpensive [non lab/passsive] way to measure density. Why Wide band O2 attempts to trim idle injection time.
Playing with injectors requires some engineering experise to get it right....plus lots and lots and lots of testing and tweeking.
When you increase injector size nearly impossible to achieve a smooth low rpm idle because that 1/2 drop is 2-3 times larger [in volume] and needs 1000-1500 rpm [2-3 times more air for combustion] to be correct.
The greatest engineering challenge in performance engine design is the smooth low rpm idle.
Last edited by Q45tech; 01-06-2007 at 05:19 AM.
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