injectors
11-21-05, 01:34 PM
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injectors
alright, i have a 89 t2 and i need someone bigger injectors...i was thinkin 4 x 720cc or something close to taht, but the problem i am running into is my stock injectors are high impedence and all the ones i can find are low impedence....do any of u know wehre i can find some high impedence ones??
11-21-05, 03:53 PM
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You don't want to increase primary injector size on the stock ECU. It can cause flooding and idling issues.
You won't find any high impedance 720CC injectors. All large injectors are low impedance. Just put a 10Ohm 10W resistor in series with each injector.
You won't find any high impedance 720CC injectors. All large injectors are low impedance. Just put a 10Ohm 10W resistor in series with each injector.
11-21-05, 04:44 PM
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not to steal your thread, but i drive an 87 TII and am looking to put in 720cc secondaries with an Rtek 1.7, would i need to put a 10 ohm resistor in too? does it matter which lead it goes in series with? or do i put one on each lead?
11-21-05, 05:38 PM
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Only SOME series four use low impedence injectors. Learn something new every day, don't we?
Rotary Performance sells injectors and the resistors: http://www.rx7.com/
Rotary Performance sells injectors and the resistors: http://www.rx7.com/
11-22-05, 11:59 AM
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Originally Posted by Aaron Cake
You don't want to increase primary injector size on the stock ECU. It can cause flooding and idling issues.
You won't find any high impedance 720CC injectors. All large injectors are low impedance. Just put a 10Ohm 10W resistor in series with each injector.
You won't find any high impedance 720CC injectors. All large injectors are low impedance. Just put a 10Ohm 10W resistor in series with each injector.
where would i get these resistors?? and would i need them if im running a microtech lt8?? or could i just program it in there without puttin the resistor in?? im a complete noob when i comes to the electrical components of the fuel system...where are these resistors??
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11-22-05, 02:54 PM
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Any danger if you run bigger secondaries without the resistors? I am not sure exactly what the difference is with high impedence vs. low impedence. Not too electronics saavy. 
11-22-05, 03:13 PM
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Originally Posted by Funkspectrum
half of the 87 year uses high impedance...
bet ya didn't know that...
bet ya didn't know that...
thats no good...how do i know if mine was the half with low or with high?
11-22-05, 03:18 PM
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Originally Posted by MattB
yeah...thats what he is saying...i need low impedance injectors for my 87 TII...thanks...ill search the forum cause i only wanna spend 150 max for both injectors...
11-22-05, 03:22 PM
#13
Originally Posted by gregk
Any danger if you run bigger secondaries without the resistors? I am not sure exactly what the difference is with high impedence vs. low impedence. Not too electronics saavy.
High impedance are generally called "Saturated" and low impedance are generally called "peak and hold".
The FC never really ran in any other mode then Saturated, its just the location of the resistors was changed (probably to save money). Saturated injectors, and Peak and Hold injectors with a resistor look about the same electrically to the ECU.
If you run low impedance injectors with no resistor then you run the risk of frying the drive circuts of the ECU.
On a side note, alot of ECUs (to include the Haltech E6K) can run low impedance injectors in Peak and Hold. This gives a faster response/rise time and provides a better performing injector.
Rat
11-22-05, 03:59 PM
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Originally Posted by MattB
not to steal your thread, but i drive an 87 TII and am looking to put in 720cc secondaries with an Rtek 1.7, would i need to put a 10 ohm resistor in too? does it matter which lead it goes in series with? or do i put one on each lead?
You will have to look at your existing injectors to see if they are low impedance, or look for the injector resistor pack under the airbox.
Doesn't matter which lead the resistor goes in series with.
11-22-05, 04:09 PM
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Originally Posted by J-Rat
...If you run low impedance injectors with no resistor then you run the risk of frying the drive circuts of the ECU....
Rat
Rat
11-22-05, 04:26 PM
#16
Originally Posted by gregk
Does this mean if I fry those circuits, my injectors won't work properly? Any danger of blowing my engine as a result of fried drive circuits?
11-22-05, 04:56 PM
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That is a good point about the resistors. I'll have to look into doing that. Will my friend know what it means that they need to be wired in series? I know I don't know what that means...One friend works at radio shack and the other claims to be fairly knowledgable when it comes to electronics. Or should I just read about it and do it myself?
Also, is there any advantage to having low impedance vs. high impedence injectors in general? Are the early s4 guys better off than me. I have an 88TII. Just curious. I don't mean to thread jack. This is good info I think. Unless, everyone already knows all this stuff and I am just a moron.
Thanks in advance Rat.
-Greg
Also, is there any advantage to having low impedance vs. high impedence injectors in general? Are the early s4 guys better off than me. I have an 88TII. Just curious. I don't mean to thread jack. This is good info I think. Unless, everyone already knows all this stuff and I am just a moron.
Thanks in advance Rat.
-Greg
11-22-05, 05:32 PM
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This place sells the resistors at 10 bucks a pop. No, I never bought any.
I'd suggest getting the solenoid resistor package out of a old 86-87 1/2 car and use them. Some thought required if you do it that way.
I'd suggest getting the solenoid resistor package out of a old 86-87 1/2 car and use them. Some thought required if you do it that way.
11-22-05, 06:41 PM
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i forgot the URL http://www.rx7.com/
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