36# low impedance why not?
Thread Starter
12 Second Club
iTrader: (10)
Joined: Sep 2005
Posts: 948
Likes: 0
From: From Ohio now in that state up north
36# low impedance why not? Ok i think this is the right place for this. Now can are cars stock computers (high impedance driver) run a low impedance injector if the injector is small enogh that i wont cause idel problems like a 36# I know that you cant use big injectors because they are low impedance and you canot get the injector to open fast enogh and by the time its open it needs to be closed. Maby I have just switched it around in my head and low impedance drivers can run a high impedance injector but it seems like the computer would send to much intal curent to the injector and burn it out. If I am switching things around let me know i dont want injectors that wont work with the stock computer.
Low impedance injectors will not limit the driver
current, and you stand a good chance of roasting
them (hello, new PCM) the first time you go to
higher pulse widths. Using high impedance injectors
on a low-impedance system will produce poor
performance because the coil current is then
double-limited. The driver circuits are just very
different and "shrink-fit" to the intended injector.
current, and you stand a good chance of roasting
them (hello, new PCM) the first time you go to
higher pulse widths. Using high impedance injectors
on a low-impedance system will produce poor
performance because the coil current is then
double-limited. The driver circuits are just very
different and "shrink-fit" to the intended injector.
I posted the full info on the Bosch Brown Top injectors that you have in question in your other thread in the Fuel Forum.
They will flow 37.0 Lbs/Hr @4 bar (58.02 psi) & they are High Impedance injectors that were used on the early T-bird Supercoupe. This value is @ 100% Duty Cycle which is essentially an injector that is held open (static) or has reached it's max Pulse Width for given RPM.
As a note, ideally you do not want to exceed 80-85% Duty Cycle (due mostly to injector solenoid heat buildup). Some here will say they run their injectors at close to 100%, or even above, all the time. While they may run fine for a time, they eventually will be damaged by the high heat which will cause irregular fuel delivery or a erratic operation at low engine rpm. This will hurt your performance and make it hard to properly tune your car.
LS1 uses High impedance injectors and fuel system operates @ 4 bar. So if your injectors have the P/N stated in my answer - they will work with LS1 and flow as above...
-Jay-
They will flow 37.0 Lbs/Hr @4 bar (58.02 psi) & they are High Impedance injectors that were used on the early T-bird Supercoupe. This value is @ 100% Duty Cycle which is essentially an injector that is held open (static) or has reached it's max Pulse Width for given RPM.
As a note, ideally you do not want to exceed 80-85% Duty Cycle (due mostly to injector solenoid heat buildup). Some here will say they run their injectors at close to 100%, or even above, all the time. While they may run fine for a time, they eventually will be damaged by the high heat which will cause irregular fuel delivery or a erratic operation at low engine rpm. This will hurt your performance and make it hard to properly tune your car.
LS1 uses High impedance injectors and fuel system operates @ 4 bar. So if your injectors have the P/N stated in my answer - they will work with LS1 and flow as above...
-Jay-
Last edited by 1QUIKWS6; Dec 3, 2005 at 08:12 PM.
Oh, and as far as Impedance goes:
It describes the electrical resistance of the solenoid windings inside the injector. The easiest way of determining the impedance of your injectors is to measure the electrical resistance across the two electrical connections with a multimeter.
This will determine the impedance value, measured in Ohms. Injectors are grouped into the two broad catagories:
Peak and Hold or Low Impedance (Current Mode) 2.0 - 5.0 Ohms
Saturated or High Impedance (Voltage mode) 12 - 16 Ohms
So check your injectors as described above to be sure as well as comparing the P/N's to the one I mention in the other thread.
It describes the electrical resistance of the solenoid windings inside the injector. The easiest way of determining the impedance of your injectors is to measure the electrical resistance across the two electrical connections with a multimeter.
This will determine the impedance value, measured in Ohms. Injectors are grouped into the two broad catagories:
Peak and Hold or Low Impedance (Current Mode) 2.0 - 5.0 Ohms
Saturated or High Impedance (Voltage mode) 12 - 16 Ohms
So check your injectors as described above to be sure as well as comparing the P/N's to the one I mention in the other thread.
