jonathon Posted June 28, 2014 Share Posted June 28, 2014 Hi all, I've recently had some work done to my r32 gtr, (larger injectors, boost increase, adjusted cams) and have had a retune (nistune). I've driven the car and competed in a hill climb, and all is well, however all of a sudden was unable to start the car. After investigating- turns out the injectors are high impedance not low (was advertised as direct replacement - I guess that doesn't mean anything!). I've now removed the resistor and it's now running again. So my long winded question is - would it need to be retuned now the injectors are getting correct ohms/power? Or doesn't it make a difference? Was strange how it was running well for a week.... Link to comment https://www.sau.com.au/forums/topic/444956-tuning-question-post-injector-resistor-removal/ Share on other sites More sharing options...
Ben C34 Posted June 28, 2014 Share Posted June 28, 2014 That is an odd one. I would certainly check afr on a dyno (I assume you don't have a wideband installed) Link to comment https://www.sau.com.au/forums/topic/444956-tuning-question-post-injector-resistor-removal/#findComment-7323943 Share on other sites More sharing options...
MJTru Posted June 28, 2014 Share Posted June 28, 2014 (edited) This is weird. I wired a power fc for a gtr to work in a gtst. I got it and it all worked good. Of course I had no vtc. What I learned was that all rb ecu wants to see a high impedance resistance. The rb25 are high impudence injectors and the gtr rb26 are low but the gtr has a resistor pack to boost the low impedance injectors to a high ohm reading. So in short all ecu's wants to see high impedance signal. I really think nissan thought peopel wouldn't get this. Lol. If you have high impedance injectors on a rb26 ecu.?? Just get rid of the resistor pack (rewire) it and you will be ok. From a resistance stand point. Edited June 28, 2014 by MJTru Link to comment https://www.sau.com.au/forums/topic/444956-tuning-question-post-injector-resistor-removal/#findComment-7324042 Share on other sites More sharing options...
GTSBoy Posted June 28, 2014 Share Posted June 28, 2014 Um....Marcus....that's exactly what he said and did. OP.......Yes, retune. The opening behaviour of the injectors will be different without the resistor - effectively the latency will probably be changed the most - so it will affect light load mixtures more than high load, but still worrth doing. Link to comment https://www.sau.com.au/forums/topic/444956-tuning-question-post-injector-resistor-removal/#findComment-7324102 Share on other sites More sharing options...
jonathon Posted June 28, 2014 Author Share Posted June 28, 2014 Awesome - thanks for the help guys. Such a pain in the backside - as it only just came back from the tuner! So are the injectors slower to open? I'd hate to be driving it running too lean... Link to comment https://www.sau.com.au/forums/topic/444956-tuning-question-post-injector-resistor-removal/#findComment-7324231 Share on other sites More sharing options...
MJTru Posted June 29, 2014 Share Posted June 29, 2014 Um....Marcus....that's exactly what he said and did. OP.......Yes, retune. The opening behaviour of the injectors will be different without the resistor - effectively the latency will probably be changed the most - so it will affect light load mixtures more than high load, but still worrth doing. Yes GTSBoy I agree thats what he was saying. I may have missed somthing tho. A rule of thumb for me is. Any mods to fuel or air should be mapped and retuned. Intresting info GTSBoy as I never thought it would affect the injectors the way you mentioned it. I will be looking into this. Also intresting to know it would make more difference in the down low area. Hmmmm Link to comment https://www.sau.com.au/forums/topic/444956-tuning-question-post-injector-resistor-removal/#findComment-7324637 Share on other sites More sharing options...
MJTru Posted June 29, 2014 Share Posted June 29, 2014 (edited) Damn ant know how I missed all that. Its the same damn thing he was saying-_- Edited June 29, 2014 by MJTru Link to comment https://www.sau.com.au/forums/topic/444956-tuning-question-post-injector-resistor-removal/#findComment-7324641 Share on other sites More sharing options...
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