bryan01 Posted March 3, 2008 Share Posted March 3, 2008 really quick, anyone know what this is? or can anyone do me a HUGE favor and go and measure it on their car? i don't have my stock injectors anymore, i found info for an rb20 and rb26 on here, but not the rb25 ... i also found info in a rb repair manual, but it said it was the same as the rb26, which would mean it's a low imped injector just like in the rb26, which it's not. i found a spec sheet for some aftermarket injectors for the rb25 that say they're 11.4 ohm's, so i'm assuming the stock ones would be around this level. just want to check to make sure, thanks. Quote Link to comment Share on other sites More sharing options...
Careless Posted March 4, 2008 Share Posted March 4, 2008 http://paulr33.skylinesaustralia.com/docs/powerfc-faq/inj_top-en.htm lucky my friend nick sent this to me yesterday night. LOL number 3 on the list. Quote Link to comment Share on other sites More sharing options...
triple B Posted March 4, 2008 Share Posted March 4, 2008 i looked in my R33 factory manual and i could not find a spec but i did nto look real hard since its low impedence the resistance should not be more than 13 ohms i woudl say if the reading it between 11 and 12.5 ohms they should be good Quote Link to comment Share on other sites More sharing options...
triple B Posted March 4, 2008 Share Posted March 4, 2008 http://paulr33.skylinesaustralia.com/docs/powerfc-faq/inj_top-en.htm lucky my friend nick sent this to me yesterday night. LOL number 3 on the list. nice find raff now i don't have to dig through the manual Quote Link to comment Share on other sites More sharing options...
bryan01 Posted March 4, 2008 Author Share Posted March 4, 2008 i found that earlier too, but i was thrown off by the title of the page being "top feed injector". the stock rb25's are side feed. maybe i'm just being picky the rb25's are high impedance, just to clarify. i was saying that IF my r33 manual were correct, then the rb25 and rb26 injectors are the same, and they're resistance is 1.3 ohm's each. but it's not correct. EVERYTHING else online says that rb25's are high impedance and rb20's and 26's are low, including that link to that chart. it says that rb25's are 14.6 ohm's and rb26's are 2 ohm's. i found a different chart that was linked to some 550cc injectors being sold as rb25 direct replacements, and it's got 11.4 ohm's. it also only says there's 4 injectors, so i dont know how accurate it is (then again, i'm picky ) ... and they're not stock, but to be a direct replacement it'd have to be in the range that the computer could read, and thats a decent amount from 14.6 ... can the stock computer really support that range? Quote Link to comment Share on other sites More sharing options...
chrism Posted March 4, 2008 Share Posted March 4, 2008 I have some GTR444 injectors top feed injectors that were used in the RB26. They are 1.3 ohms when measured. Usually the larger injectors are low impedance. The smaller injectors used in the RB20 (270cc) are high impedance. They are around 13 ohms. If you need to have a dropping resistor inline with the injectors then the injectors are low impedance. If you don't need the dropping resistor such as the RB20DET then the injectors are high impedance. Look at the schematic that comes with the RB26 and RB25 FSM it should show the dropping resistors in the circuit. Quote Link to comment Share on other sites More sharing options...
bryan01 Posted March 4, 2008 Author Share Posted March 4, 2008 cool, that means i'm at least right about the rb26's. the rb25's are high impedance and don't show a resistor pack inline to the injectors on the wiring schematic. the reason i'm asking all of this is because i'm finally setting up my apexi FC to run my low impedance injectors. the apexi FC is setup like the stock computer, which runs a high impedance system on the rb25. if i knew exactly what the stock injectors' resistance was, i could calculate the size of the resistors i would need inline, just like you said chris, to drop the voltage and run low Z injectors on a high Z system. i bought some resistors tonight online that should get me in the ballpark, and i'll test them out and post the results. who knew 25w resistors were so hard to come by. Quote Link to comment Share on other sites More sharing options...
triple B Posted March 4, 2008 Share Posted March 4, 2008 hmmmm i need to remember if the 1000cc top feeds i bought are high or low impedence i can't rememeber. i am using a greddy emanage ultimate so i may have to use the resistors i bought thanks for makin that point Quote Link to comment Share on other sites More sharing options...
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