I just had some 550cc US mkiv injectors sent out to RC for flow testing and cleaning and I also received a sheet that stated each injector only flowed 450cc. Anyone else?
What's the deal with USDM 550's?
- Thread starter rakkasan
- Start date
Jon@935motorsports said:
LOL, mine too. I haven't seen any documented flow charts for 550's yet....
Boostage said:
So far, the only documented proof (flow charts) says that the purple tops are 450cc
Don't Go by the sheet to determine your Highest HP rating.
I put down 485 @ 22psi on my 1jz with a -15% on my AFC. Meaning
there is still room for growth. Stock ECU, no cams or any other internal mod.
Just stock fuel rail with the 550inj, AFPR and GT-40.
I put down 485 @ 22psi on my 1jz with a -15% on my AFC. Meaning
there is still room for growth. Stock ECU, no cams or any other internal mod.
Just stock fuel rail with the 550inj, AFPR and GT-40.
tissimo said:
Nah, approx. 450cc average.
They all read differently by like 1-5cc difference (447cc,449cc. etc.)
drewgo said:
how did you blow your 1j? was the injectors not feeding enough fuel making you run too lean?
86_sports_1jz said:
431 you are well over 80% duty cycle on the 440's.
So one night I was toying around with the boost controller, did a few 3rd gear pulls on the hwy and never switched it back to were it was tune for.
The next day on the hwy I was running a few cars, was in 4th, hit 5th then BOOM....oil everywhere, white smoke inside my car..... it was a mess.
I leaned it out, pushing 19-20psi when 17 psi was the max I could run on my tune.
Learned my lesson My foot is too heavy and 400rwhp just doesn't do it for me no more so 440's will never be in any of my engines....
i was consistantly around 480 WHP on purple top mk4 injectors I never had any problems with my 1jz.... I did the 523 run once and back it down because when I added fuel pressure, I went leaner probably due to running out of fuel pump LPH @ high pressures.
I recently had a set of purple injectors flowed and tested with the same part number as the 440cc purple one and they came back 540cc injectors! WTF?Toyota/denso gone mad!
