injector flow CALCULATION

[Evo_Lee]

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

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]

My bet is that isn't far from the truth, its the most feasable and lateral answer to the question 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]

@ 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

[Cubes]

What injectors did you go Chris?

Let me know how the fuel consumption goes with them.

[Chris32]

What injectors did you go Chris?

 

Let me know how the fuel consumption goes with them.

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 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

[drunkenmaster]

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.

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.

[Duncan]

pfft you can get 511rwhp on stock gtr injectors

[Cubes]

If 'stock' rb25 injectors can get 511rwhp then surely the gtr injectors should be able nudge 600rwhp.