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injector flow CALCULATION

CEF11E

By CEF11E,
in Engines & Forced Induction

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Evo_Lee Experienced

Evo_Lee

Posted
Posted
Mine has made 200rwkw (197,200,200 on three seperate dyno's) on standard injectors. I must admit though, the tune was quite lean. It has got a Bosch 040 in tank pump, and no form of fuel pressure adjustment apart from what the pump delivers. Dunno how, as your calculations seem to point to them being un-able to make that sort of power?

P.S -thats my qoute about the 18psi :D

Chris

@ 100% duty i.e. not giving the injectors enough time to open and close and given you only have less than 40kw loss...yes this is possible!

But highly not recommended 90% is still OK...but tuners will do it at 60-70% duty, over here anyway.

Chris32 Veteran

Chris32

Posted
Posted

My bet is that isn't far from the truth, its the most feasable and lateral answer to the question :D If that was the case, there is bound to be a few more around

Most people's injectors are covered with a bit of filth and are hard see without removing them, I will keep a eye out for other RB20 injectors and see if I can find another!

If they were CA or GTR injectors, there would be a ballast resistor attached to the loom somewhere, so I stand by what I reckon - ran out of red colouring! :)

Chris

Chris32 Veteran

Chris32

Posted
Posted
@ 100% duty i.e. not giving the injectors enough time to open and close and give you only have less than 40kw loss...yes this is possible!  

But highly not recommended 90% is still OK...but tuners will do it at 60-70% duty, over here anyway.

I am pretty sure they where near on 100%, as soon as the fuel filter became the slightest bit of dirty, it would suffer light detonation - new fuel filter and some injector cleaner in the tank and all would be good

The car would backfire and flame alot when I came of the throttle, suggesting to me the injectors where working 100% of the time and there would be a little bit of fuel still entering the cylinders after I had lifted of the throttle

hopefully the new injectors will need no more than 60% to make 200odd rwkw

Chris

Chris32 Veteran

Chris32

Posted
Posted
What injectors did you go Chris?

 

Let me know how the fuel consumption goes with them. :D

I went 440cc GTR in the end, and wired in the resistor pack etc, I figured it would be plenty for my RB20

So far with the PFC closed loop function, fuel economy is around 10 litres per 100km, about a litre per 100 better than with the re-programmed ECU :D The PFC closed loop function is first class, providing it is setup right

In the injector correction section (cant remember exactly) there is a correction and lag setup, if you work out the percentage differance from stock and enter this value in - for me it was 58.5% and the injector lag time, in my case -.12ms, it runs better than ever before and delivers quite good economy

The injector lag/cc table for standard nissan stuff can be found here - http://www.ap-engineering.co.jp/el/inj_top.htm

Its being tuned shortly for more boost etc, but hopefully the economy will remain similar providing I dont use the loud pedal too often :)

  • 5 weeks later...
drunkenmaster Community Regular

drunkenmaster

Posted
Posted
The most common upgrade for RB20's are the 444 cc GTR injectors, with the GTR resistor pack to match the impedance, they are a good choice at realtively low cost as there are many around.

:P

In practice, what is the maximum power achieved with 444cc GTR injectors? I am searching through the forums right now, but may as well ask at the same time.

Reason being, I am going shopping for some parts on the weekend and there doesnt seem to be much price difference between R34 GTR injectors or aftermarket 550cc injectors here in Japan, so I could go either way. I do not want excessively large injectors though and my realistic power goal is 250rwkw from my RB30DET.

Opinions on this choice with fuel economy and idle in mind?

EDIT: Found it ~270rwkw. Opinions still welcome.

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