like the title states:

Are VQ35DE injectors Saturated or peak and hold?

if they're saturated, what are the highest saturated injectors available?

if 550 is the highest, will it be possible to convert to peak and hold injectors using a resistor box?

thanks



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http://g35driver.com/forums/showthread.php?t=39381
'04 TB 6mt nav

 

The factory injectors are saturated. RC makes saturated injectors up to 750cc's, and they will fit with out stock fuel rail, or the AAM rail. Spacers may be needed if you dont have the Greddy kit's included spacers.

Anthony and SGP Racing are running 750cc RC's, and I will be using 550's.

For reference, they also com in 650cc.

 

hmm interesting.. How much hp are 550's good for?

I was hoping to get 1000cc injectors just in case if I wanted to build my motor in the future.

I suppose 750ccs will suffice hehe

 

1000cc injectors are usually only Peak and Hold Style.....

750cc injectors are good for an easy 750whp and probably more. This is assuming you have a full return fuel system, rising rate FPR, and upgrade fuel pump.

 

accordfreak,

If you're planning to go with larger injectors (> 750cc), do yourself a favor and buy an engine management solution that can properly drive peak and hold (low-impedance) injectors. Using a ballast resistor to use a low-impedance injector with a saturated injector controller defeats the purpose of a low-impedance injector. You lose the precise control over injector open and close times, and performance will suffer, as well as idle quality. Essentially, the resistor would just turn the peak/hold injector into a saturated injector. There is a reason why injector companies don't usually sell saturated 1000cc injectors -- they're too difficult to control.

 

i read somewhere thats its benificial in the long-run to pick injectors sized for how much power you plan on making. reason being injectors work more efficiently if they are operating in their duty range.

meaning... buying 1000cc injectors, to run a 7psi tt kit, with the option to run more boost, and deliver more fuel (with the larger injectors), is not as good of a choice as...

say, getting PE380cc injectors, something more sized properly for a 7-9 psi boost, and then getting a diff set of 550+cc or higher injectors if the power level requires in the future (at additional cost of buying 2 sets ofcourse).

can someone explain the whole 'duty' cycle thing. still learning.



-phil

 

Duty cycle is a measurement of injector "on time" versus cycle time.

Suppose the engine is running at 6000 RPM. This means the engine is running at 100 revolutions per second. This equates to a single engine cycle every 0.01 seconds, or 10 milliseconds. If 6 of those 10 milliseconds are spent with the injector open, spraying fuel, then you have a 60% duty cycle. (6ms open / 10 ms total = 60%)

In general, you want to size your injector for around 80% duty cycle.

 

well it's going to be awhile before i buy injectors.. it's my researching point at this time and hopefully by the time i start buying stuff, AEM will come out with an EMS already....

 

guess i should mention that im anthony... lol.. the guy sharif mentioned..

I know there has been speculation that 1000cc injectors could actually damage your rings because there would be too much fuel at idle at least this would be with something like the e-manage..

It seems charles from CJ motorsports found out a way to run that size injectors with no problems. He has the f-con pro from HKS a stand alone... you should probably talk to him if you are looking to go with that size..

Kyle from SGP recommended 750cc's for my power goals (600whp) and they have built a car over that number with no problems... i could probably use lower like 650cc's but then id possibly have to worry a little more about the duty cycle of the fuel injectors.