whats the deal with mkiv 550's
- Thread starter Boostage
- Start date
Boostage;1249904 said:
The purple top USDM "550's" I bought were cleaned and flowed during my 1J swap. They flowed only 450cc. Until I see factual data, I believe it to be a myth.
As per Toyota, flow rate should be between 496cc/min and 576cc/min, so that makes them ~540cc.
If you're below 496cc/min, the injectors are no longer good.
From what I've read, a lot of USDM GTE injectors are testing lower, all that means is that a lot of injectors out there are not working properly, as far as I'm concerned.
Jeff
If you're below 496cc/min, the injectors are no longer good.
From what I've read, a lot of USDM GTE injectors are testing lower, all that means is that a lot of injectors out there are not working properly, as far as I'm concerned.
Jeff
tissimo;1250693 said:
I guess that's possible, but from what I recall, Jose and Aaron had them flowed twice so...... Maybe one of them will chime in.
Jeff Lange;1250049 said:
ive read all the speculation and what not, and i would take this mans word over most other peoples!
you should be having your injectors cleaned and flow tested anyhow, so if they dont flow what you need them to flow why are you using them?
we all should know by now that getting used parts is usually some what of a crap shoot. i picked up a set of mkiv 550s and will send them out to get cleaned and flow tested, if they test low then i guess im out of luck!
Has any one actually flowed a set of USDM injectors and have them come back within the specs that Jeff listed? We've had similar discussions before, and to the best of my recollection, no one has documented 550's. I'm not doubting Jeff, but Toyota has been known to make mistakes before......
And Lagged, I ended up putting in grey top JDM 440's that were cleaned and flowed, they were within specs.....
And Lagged, I ended up putting in grey top JDM 440's that were cleaned and flowed, they were within specs.....
I'm only stating what Toyota says they should be. Unless you order a brand new one from Toyota, and have it flow tested, any other injector you flow test is suspect.
All I'm saying is that if we had a 2JZ here at work and they tested as low as some peoples do, we'd be replacing them.
Jeff
All I'm saying is that if we had a 2JZ here at work and they tested as low as some peoples do, we'd be replacing them.
Jeff
rakkasan;1250918 said:
What did the 440s flow on the sheet? did you have to mess with the fuel any? I would assume if you didn't you had a bad set of injectors. When I've upgraded from 440s on a couple cars I've always had to pull more fuel.
It's a big myth that USDM 2JZGTE injectors only flow 440cc. I bought these off a guy on Supraforums for <$100, purple top 550cc injectors. After all the talk I've read about how they don't flow 550, I was pretty worried that I'd have to sink even more $$ into new injectors, so instead I sent them to Witch Hunter to get cleaned/tested/flowed. The results...they aren't 550's...they're 540's. Here's the proof and I'm glad I sent them off as one of them was pretty much clogged completely:
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impedance, ahahahahhahaha
not necessarily that they're better, but those high impedance ones flow more than the low impedance 440's. low impedance injectors open/close faster, but don't last as long as high impedance which have a slightly slower response time as they require less amperage to operate
or so i've read
not necessarily that they're better, but those high impedance ones flow more than the low impedance 440's. low impedance injectors open/close faster, but don't last as long as high impedance which have a slightly slower response time as they require less amperage to operate
or so i've read
Sent mine off to Witch Hunter last week Tuesday, got a Paypal invoice on Friday, paid for it and got them back yesterday. I was very surpised that two injectors actually were essentially bad. Now they're all nice and pretty...practically new again and I know exactly what they flow.