[X-One]

i'm trying to fide a car that comes stock with 550 cc injectors so i can go to the junk yard and pull them for cheap. and will a 2jzgte injectors fit a 7mgte and are they 550cc stock?

 

[87_7MGTE]

2jz injectors wont fit, 87 turboII rx7s came with 550s stock, but they only came with them for the first half of 1987 i think

 

[Justin]

all that style of rx7's came with them, it was the first have of 87 that came with low impedance, the rest were high

 

[X-One]

what is the difference between low and high impedience

 

[cheappower82]

about 8 ohms

 

[87_7MGTE]

for turbo cars, the impedience doesnt really matter, and i thought the latter half of the turbo IIs came with 440s?

 

[Justin]

impedance doesn't matter? Since when? I have never heard that before.

 

[sportinct26]

nope.. im preaty sure that the first early half od 87 RX-7 turboII came with 550cc low impedence..

the rest of the 2nd gen turbo II rx7 came with high impedence 550cc.

the na 2nd generation came with a 460cc..

oh btw good luck finding a turbo 2 rx7 in the junk... i look in like 4 only found n/a's


and did i mention that the rx7 only came with 2 injectors? with that said youyll need to find 3 TURBOII rx7... low empedence is better from what ive read

 

[turbo87supra]

nope.. im preaty sure that the first early half od 87 RX-7 turboII came with 550cc low impedence..

the rest of the 2nd gen turbo II rx7 came with high impedence 550cc.

the na 2nd generation came with a 460cc..

oh btw good luck finding a turbo 2 rx7 in the junk... i look in like 4 only found n/a's


and did i mention that the rx7 only came with 2 injectors? with that said youyll need to find 3 TURBOII rx7... low empedence is better from what ive read

Turbo II RX-7's came with 4 550cc injectors. I believe the ones that will work only came out of the early 87 TII's. Either way you have to find 2 cars and then the condition of the injectors is unknown so the best thing to do is have them flow checked and balanced. Once you've spent all this time tracking down injectors from an early 87 TII RX-7 and spent the money having them balanced, you might as well just buy new 550's that you know will work. Just my $0.02.

 

[Jeff Lange]

impedance doesn't matter? Since when? I have never heard that before.

If you get high impedance you can just run it without the resistor pack.

You can run any impedance you like if you were so inclined, you just need to set up your own resistor pack to get the correct impedance for the ECU.

Measure the actual impedance of your system in the car, and the impedance of the injectors, and setup your own resistors to get the same as stock... not that hard.

There's an acceptable range though, so you don't have to be exact. Low impedance injectors with the resistor pack, high impedance injectors without the resistor pack, and you're good to go.

 

[Justin]

but it still matters I knew about the resistor pack, i thought whoever I responded to was saying it didn't make a difference what-so-ever


I also remember reading somewhere that even with high imp. injectors, if you take out the resistor pack it doesn't run as well... do you know anything about that jeff?

 

[[email protected]]

Hey Jeff- Is there a thread or tutorial on how to do that resistance adjustment? I always see high-impedance injectors for sale on Ebay.

 

[Jeff Lange]

Series Resistance:
Rt = R1 + R2 [+ R∞]

Parallel Resistance:
1/Rt = 1/R1 + 1/R2 [+ 1/R∞]
which intern becomes:

Rt = 1/(1/R1 + 1/R2 [+ 1/R∞])

Rt being total resistance
R1 = first resistance, R2 = second, and so on.

 

[[email protected]]

:wtf:

Okay. Now...what do I do?

 

[Jeff Lange]

Rearrange the formulas to find the resistance you'll need to get the total resistance you require.