What's the deal with USDM 550's?

rakkasan

rakkasan

Currahee!!
Mar 31, 2005
2,997
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Fort Campbell, KY
I bought a set of 550's, or at least they were supposed to be 550's, for my ride. Aaron had them cleaned & flowed, only to find out that they only flowed 450cc IIRC. I've heard more than one person mention that USDM 2J injectors aren't 550's, but more like 460cc's. Is there any truth to this or did I get robbed?
 
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silversup

silversup

Supraluva
May 25, 2005
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Philly
i read another thread on one of these forums where they had both jdm and usdm injectors flow tested. both averaging around 450 average. Now im looking for something tht will actually flow 550
 
R

Ric

Setting the standard
Feb 22, 2007
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Central Florida
www.1jzgte.us
Im starting to think that 550's are a myth, and they are 440's like JDM except different impedence. Of course, I think 1993 supra TT's differ from 94+. Maybe the 93's are 440
 
fstlane88

fstlane88

Single time!!
Apr 5, 2005
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South FL
I'll have to look for my flow sheet from RC, I'm pretty sure they were all well over 500cc at least, no way as low as 440. I wouldn't have installed them had that been the case.
 
werewolves182

werewolves182

is without a supra :(
Aug 23, 2005
436
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Crownsville, MD
Hummmm, I just installed my MK4 *550s* last night. When I input the fuel correction from 370 to 550 in my emanage the car ran EXTREMELY lean. Idle was off the sale lean (above 17.9) I wasn't even going to attempt to drive it like that. So I kept recording test runs and settled at 480cc as the fuel correction. It seemed to like that the best. So Im really thinking that 550's are a big myth.
 
9

935motorsports

Active Member
Mar 30, 2005
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San Diego, CA
Jason's 1J, running with the correction of 550cc in the emanage caused it to be lean. Once we changed it to 470/480 the A/Fs were back in good shape.

It also is running out of fuel around 420 at the wheels so that sort of agrees with the 440 statement. Some have done over 500 with MKiv 550s, but were dangerously at 100% duty.
 
silversup

silversup

Supraluva
May 25, 2005
203
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Philly
drewgo said:
I dropped of my 550's this morning to get clean and flow tested.
I'll pick them up tomorrow so I'll post up what I get.
Click to expand...

Excellent! Cant wait to see the results. I am looking at getting injectors soon.
 
drewgo

drewgo

Akuna MaTata...!
Dec 1, 2006
482
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South florida
tissimo said:
how much was it drewgo? The place in fort lauderdale or wahtever? I want to get a set I have cleaned and tested..
Click to expand...

Yea man..... I paid $90 for all 6 cleaned and flow test. I'll get a spec sheet with every one of them.
They are pretty busy so turn around is 2 days. You wanna get them cleaned over here?
 
P

ProjectGoFast

BOO 7M HOORAY 1J
Mar 20, 2006
43
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Cali
On my emanage I have the injector size at 420 now, like Robert posted at 550 it pulled way too much fuel and even at 420 I have the fuel settings almost maxed at full boost (16psi) and its still a little leaner than I would like
 
drewgo

drewgo

Akuna MaTata...!
Dec 1, 2006
482
0
0
South florida
OK so I just got back from picking up the 550 injectors.
They measure them in lbs.
so my results are as follows:
1-48
2-47
3-47
4-50
5-47
6-47

So my final Average flow in cc is 437

Kinda upsetting, right? But here's where I can feel a bit better about them.
The machine that is used has a flat pressure rate of 3 bar which is 46psi of fuel pressure @ 2500rpm. I would imagine that if you increase the fuel pressure and increase the rpm it would flow more. Which is what the gentlemen told me but could not give me specs on higher fuel pressure or rpm.
If someone can make more sense of this please share with us.
 
tissimo

tissimo

Stock is boring :(
Apr 5, 2005
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Melbourne, FL
lbs x 10.5 = cc

1-504 cc
2-494cc
3-494cc
4-525cc
5-494cc
6-494cc

2500 rpm? interesting.. I though they were tested at 100% duty for a minute..... dunno..
 
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