WRX v2 sti injectors

[Guest]

Even though they have grey top injectors are they 440cc???

[BC5RA]

380s will be good for around 180kw at the wheels after that 440cc yellow tops from V3/4 STI and you'll crack 200kw@wheels.

Then you'll have to go aftermarket and require a Tunable ECU.

[Guest]

thought so, just that Im selling some on trade me and one guy seems to think theyr 440.....almost pissed me off abit there because I was thinking I bought me v3 yellows for nothing!

[Koom]

If you test the grey injectors at 100% duty cycle they actually flow about 440cc. The yellows flow about 520cc.

But injectors are rated at 80% duty cycle which is when they flow 380cc and 440cc respectively. If you read up the american sites they call the grey tops 440's and the yellows 550's.

[Guest]

well i suppose you cant go wrong with the yellows then...thanks for the more info koom now I know why one of the bro's keep telling me the grey tops are 440's haha I think I owe him an apology and a box!

[Koom]

The Grey's are still rated as 380's though.

I flow tested some 740cc injectors and they flowed about 830cc's at 100%. I think the standard for them is to rate them on what they flow at 80% as they're not supposed to be run at 100%.

[kamineko]

There is also the issue of what pressure they have been tested at. For some reason its 3bar in the states, and JDM is 2.5bar?

[Koom]

The results I got were using a factory pressure reg which ran at 43 psi (~2.97 Bar).

If the Japanese test at lower pressures its probably due to them following a different standard for their procedures than what the yanks do.