using low impendance injectors

CVH and Zetec tuning, suspension and braking mods.

using low impendance injectors

Postby Ruishy1 on Thu Oct 22, 2009 10:41 pm

If you wanna use low impedance injectors i found this little bit of info that could be helpful :)

http://www.lextreme.com/R&D%20Injector.htm

now you can fit those low impedance injectors without much hassle.

can a mod sticky this as its always being asked :lol:
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Re: using low impendance injectors

Postby crazycage on Sat Oct 24, 2009 1:07 pm

Ruishy1 :If you wanna use low impedance injectors i found this little bit of info that could be helpful :)

http://www.lextreme.com/R&D%20Injector.htm

now you can fit those low impedance injectors without much hassle.

can a mod sticky this as its always being asked :lol:

i would just buy low impedance injectors .in fact i have just ordered 16 750cc low impedance injectors from the states :o
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Re: using low impendance injectors

Postby Ruishy1 on Sat Oct 24, 2009 5:41 pm

but not evryone has cash to throw arouind :P
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Re: using low impendance injectors

Postby crazycage on Sat Oct 24, 2009 6:41 pm

Ruishy1 :but not evryone has cash to throw arouind :P

there not expensive a set of four 750cc from the usa is only £130.
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Re: using low impendance injectors

Postby Captain Tightpants on Sat Oct 24, 2009 6:48 pm

You cannot use non-saturated injectors, the Impedance is completely wrong guys, you need to match to impedance not just the resistance. This is not an easy matter though as the impedance of the injector will change over the frequency range.

i.e. Impedance(Z) = XL + XC + R

Where XL = 2.pie.f.L

and XC = 1/(2.pie.f.C)

therefore

Z = 1/(2.pie.f.C) + (2.pie.f.L) + R

At low engine revs, the inductance(L) of the injector controls the value of the impedance as the capacitance will be negigable BUT as the frequency(f) increases the inductance(L) reduces and the capacitance(C) increases to a point where the capacitance will control the impedance. The resistance stays the same. The trick is to balance to characteristic L and C values with external Inductors and capacitors so that the impedance stays at the desired constant value throughout the operating frequency range (1000 to 7000 Hz).

It's really not worth it with EEC-IV. It's different if it's been live mapped with them. Peak & Hold's are really old hat nowadays. There are plenty of sensible saturated options available at decent prices these days.

Steve
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Re: using low impendance injectors

Postby Ruishy1 on Sat Oct 24, 2009 11:10 pm

well thats me told :lol:

just found that and people were always asking bout it so thought it stick it there
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