Im wanting to fit siemens 55lb injectors to my stg 3 cossie what does impedance mean and what is the difference between high and low impedance?

 

Impedance, means sort of resistance in easy terms.
High impedance injectors put in place of a ecu that runs low impedance ones normally will have a much harder job to run these and might damage the ecu.
A ecu that needs high then used with low is likely to overheat the injectors(don't ask me how I know!!)
Low are around 2-5 ohm, high around 12-15 ohm, roughly.
tabetha

 

ummm didnt know that,so how do u determine which ones u have pust a tester on the injector plug?

 

just been reading up on mine i use mjy100460 injectors the are 15.6 ohm high impedance and a flow rate of 480cc i got them out of a rover vitesse 30 quid i think i payed for all 6 of mine

 

How do i know which ones i need?

 

you would have to try and find out what injectors are in urs now and then find out if they are high or low impedance i guess

 

for a cossie, you need low imp 2.8ohms

 

That flow rate sounds high, was it a Vitesse as in V8?

Checking for impedance is very easy, just use a multi meter.

 

As above just test a std one, then get whatever sort you need, if you need high but have low, you can always use a resistor in the earth line to make it high impedance.
tabetha

 

no staderd rover vitesse 2.0

 

The flow rates sound high for a std Rover injector fitted to a circa 200hp (turbo) 4 pot, maybe worth getting them checked?

 

These are the ones for your cosworth if you are still running on Weber OE management.

 

Thanks people!
Stu can any tuner that can map cars reprogramme my msd chip to the spec of my car?

 

i have cheked them out i was supprised when i found out abd had the car mapped the other week and no probs there,they also use them in the mini mpi and a few other cars http://www.theminiforum.co.uk/forums...p/t107172.html
heres 1 link i did find an info link about these injectors ill see if i cant find it