i was told that all injectors 850cc and higher are all low impedance.now if i run 1000cc injectors for top end will i need resistors for them ?

in other words- i dont know if i can runn the stock hi impedance 550cc primary injectors and 1000cc low impedance secondarys injectors on a microtech lt12s with out resistors?


will the 1000cc injector fit in the stock turbo fc fuel rail???
or is the rail too small for 1000cc??

 

You should measure the resistance with an multimeter to confirm what you have. On page 3 of the manual Microtech discusses injector resistance, see link and attachment. The info looks a bit unclear and they suggest that you contact them if you have trouble, but they will probably never answer you. My interpretation is since V=I*R and V=~11-15V, lets call it 15V. And too much current is pobably what the ecu is afraid of. They state a minimum impedence of 1.5ohm with a single injector. 15V/1.5ohm= 10A. If you went to a lower impedence the current would go up and may pop something. So I wouldn't go any lower than a combind resistance of 1.5ohm. Personally I would leave a buffer too. More resistance sounds safer. And wire in parallel per Microtech's recomedation.

They say to use up to 4 (12-16ohm injectors). 4 12s would be 3ohm (from: 1/((1/12)+(1/12)+(1/12)+(1/12)) = 3) and 4 16s would be 4ohm.
http://www.microtechefi.com/software/ltmanual.pdf

 

wow i didnt think it was this technical.i will do my home work on this!!! thanks a million!

any more info you have please post it here.