Thread: USDM STI yellow side feed injectors - Definitive flow rate

Here's a good thread.
What is the factory cc's of STI 04-05 USDM [Archive] - NASIOC

and your one link says 535cc

very controversial reading through nasioc, gets hectic everyone has a theory.
I got my info from nasioc but then again the only way to be sure is to get them flowed to spec.

well if there flowing at 520 maybe they are 535's

Yah things are getting quite confusing real quick trying to read some of the other threads linked. So much conflicting info.

It seems the best we can do is fall back on those who have flow tested them like nissanwulf said. And as far as we can tell they have been flow tested by three different places with a range of 500-520cc.

It's quite possible the base fuel pressure for the STI is higher than 3 bar, which might explain the confusion in the Subaru community.

This is from 2004 and I think things were still a little confusing and new back then. Granted one of my threads about fuel pressure was from 2004. The other one is from 2006 and says the same thing + the FAQ from 2007. And the flow rate of the injectors was posted just a few days ago and everyone agreed on the 503-535cc readings.

Once again, if you want to go off the people who actually had them flow tested, they are 520cc. But, they could be anywhere from 503 - 535cc. No more, no less. So use that for your tuning. Chriscar had JWT use 520cc and said he had no problems with the program. I know there's other people on this forum that used the same program and had no issues. I wish some of those people would reply here.



Tell us where you found out about 565cc.

-G

I wish I had someone local to flow test them...

it almost seems as if you were trying to point out that i might have just lifted my info from out of thin air when in reality i have used the search button but to have come up with inconclusive or inaccurate, incorrect information. i am not the only one so please try and not pinpoint misleading info b/c of inaccurate info.
The AFR and Injector size Thread - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum
subaru sti injectors in sr20det [Archive] - FreshAlloy.com Forums
http://forums.nasioc.com/forums/archive/index.php/t-1070281.html

there are a few more site's all i did was search

When nissanwulf first told me they were 565cc I went searching and found what seemed to be a lot of supporting evidence to the claim. I also didn't find much to support that they were anything else but 565cc, until of course someone came up with the good idea of going to the most knowledgeable/respected Subaru forum and straight up ask the question.

It's very easy to find all sorts of bewildering info on the flow rate for these injectors, I wouldn't blame anyone if they thought they flowed 8 million cc a minute.


It seems like now there's at least a handle on the situation (in these forums and NASIOC at least). And I guess this really isn't a big change from a long while ago when most everyone thought they were 520cc, which now I know at least is grounded in good data coming from chriscar and JWT.

And now all that info is here in one place for others to see.

I know you didn't pull it out of thin air, but just because a few guys on Silvia or Nissan forums say it's 565cc doesn't mean it is(except Chriscar because he actually had them flow tested). I trust the folks over at NASIOC. I don't really understand what you're trying to say here, but I guess my question is if you still believe they are 565cc?



I have a set of these injectors, but have no clue where in KC I can get 1 of them flow tested, otherwise I would.

There are plenty of places to mail your injectors off to and have them flow tested. I would do that before trying to find some place local.